Add 1.5.6 header

Delete database after removing it from query server control.

.gitattributes

@@ -12,3 +12,10 @@ yarn.lock                    merge=binary
 # For more information, see this issue: https://github.com/Microsoft/web-build-tools/issues/1088
 #
 *.json                       linguist-language=JSON-with-Comments
+
+# Reduce incidence of needless merge conflicts on CHANGELOG.md
+# The man page at
+# https://mirrors.edge.kernel.org/pub/software/scm/git/docs/gitattributes.html
+# suggests that this might interleave lines arbitrarily, but empirically
+# it keeps added chunks contiguous
+CHANGELOG.md                merge=union

.github/ISSUE_TEMPLATE/bug_report.md

@@ -10,7 +10,12 @@ assignees: ''
 **Describe the bug**
 A clear and concise description of what the bug is.
 
-**To Reproduce**
+**Version**
+The CodeQL and VS Code version in which the bug occurs.
+<!-- To copy version information for the CodeQL extension, click "CodeQL CLI vX.X.X" in the status bar at the bottom of the screen. 
+To copy detailed version information for VS Code itself, see https://code.visualstudio.com/docs/supporting/FAQ#_how-do-i-find-the-version. -->
+
+**To reproduce**
 Steps to reproduce the behavior.
 
 **Expected behavior**

.github/ISSUE_TEMPLATE/new-extension-release.md

@@ -9,7 +9,7 @@ assignees: ''
 ---
 
 - [ ] Update this issue title to refer to the version of the release
-- [ ] Trigger a release build on Actions by adding a new tag on master of the format `vxx.xx.xx`
+- [ ] Trigger a release build on Actions by adding a new tag on branch `main` of the format `vxx.xx.xx`
 - [ ] Monitor the status of the release build in the `Release` workflow in the Actions tab.
 - [ ] Download the VSIX from the draft GitHub release that is created when the release build finishes.
 - [ ] Log into the [Visual Studio Marketplace](https://marketplace.visualstudio.com/manage/publishers/github).

.github/codeql/codeql-config.yml

@@ -0,0 +1,12 @@
+name: "CodeQL config"
+queries:
+  - name: Run standard queries
+    uses: security-and-quality
+  - name: Run custom javascript queries
+    uses: ./.github/codeql/queries
+paths:
+  - ./extensions/ql-vscode
+paths-ignore:
+  - '**/node_modules'
+  - '**/build'
+  - '**/out'

.github/codeql/queries/assert-pure.ql

@@ -0,0 +1,21 @@
+/**
+ * @name Unwanted dependency on vscode API
+ * @kind problem
+ * @problem.severity error
+ * @id vscode-codeql/assert-pure
+ * @description The modules stored under `pure` and tested in the `pure-tests`
+ * are intended to be "pure".
+ */
+import javascript
+
+class VSCodeImport extends ASTNode {
+  VSCodeImport() {
+    this.(Import).getImportedPath().getValue() = "vscode"
+  }
+}
+
+from Module m, VSCodeImport v
+where
+  m.getFile().getRelativePath().regexpMatch(".*src/pure/.*")  and
+  m.getAnImportedModule*().getAnImport() = v
+select m, "This module is not pure: it has a transitive dependency on the vscode API imported $@", v, "here"

.github/codeql/queries/qlpack.yml

@@ -0,0 +1,3 @@
+name: vscode-codeql-custom-queries-javascript
+version: 0.0.0
+libraryPathDependencies: codeql-javascript

.github/pull_request_template.md

@@ -1,12 +1,12 @@
 <!-- Thank you for submitting a pull request. Please read our pull request guidelines before
   submitting your pull request:
-  https://github.com/github/vscode-codeql/blob/master/CONTRIBUTING.md#submitting-a-pull-request.
+  https://github.com/github/vscode-codeql/blob/main/CONTRIBUTING.md#submitting-a-pull-request.
 -->
 
 Replace this with a description of the changes your pull request makes.
 
 ## Checklist
 
-- [ ] [CHANGELOG.md](../extensions/ql-vscode/CHANGELOG.md) has been updated to incorporate all user visible changes made by this pull request.
+- [ ] [CHANGELOG.md](https://github.com/github/vscode-codeql/blob/main/extensions/ql-vscode/CHANGELOG.md) has been updated to incorporate all user visible changes made by this pull request.
 - [ ] Issues have been created for any UI or other user-facing changes made by this pull request.
-- [ ] `@github/product-docs-dsp` has been cc'd in all issues for UI or other user-facing changes made by this pull request.
+- [ ] `@github/docs-content-codeql` has been cc'd in all issues for UI or other user-facing changes made by this pull request.

.github/workflows/codeql.yml

@@ -0,0 +1,31 @@
+name: "Code Scanning - CodeQL"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: '21 17 * * 0'
+
+jobs:
+  codeql:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      security-events: write
+      pull-requests: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@main
+        with:
+            languages: javascript
+            config-file: ./.github/codeql/codeql-config.yml
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@main

.github/workflows/label-issue.yml

@@ -0,0 +1,15 @@
+name: Label issue
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  label:
+    name: Label issue
+    runs-on: ubuntu-latest
+    steps:
+      - name: Label issue
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          echo '{"labels": ["VSCode"]}' | gh api repos/${{ github.repository }}/issues/${{ github.event.issue.number }}/labels --input -

.github/workflows/main.yml

@@ -1,5 +1,11 @@
 name: Build Extension
-on: [push, pull_request]
+on:
+  workflow_dispatch:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+  push:
+    branches:
+      - main
 
 jobs:
   build:
@@ -16,13 +22,20 @@ jobs:
 
       - uses: actions/setup-node@v1
         with:
-          node-version: '10.18.1'
+          node-version: '14.14.0'
+
+      - name: Install dependencies
+        working-directory: extensions/ql-vscode
+        run: |
+          npm install
+        shell: bash
 
       - name: Build
+        working-directory: extensions/ql-vscode
+        env:
+          APP_INSIGHTS_KEY: '${{ secrets.APP_INSIGHTS_KEY }}'
         run: |
-          cd build
-          npm install
-          npm run build-ci
+          npm run build
         shell: bash
 
       - name: Prepare artifacts
@@ -32,18 +45,36 @@ jobs:
           cp dist/*.vsix artifacts
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@master
+        uses: actions/upload-artifact@v2
         if: matrix.os == 'ubuntu-latest'
         with:
           name: vscode-codeql-extension
           path: artifacts
 
+  find-nightly:
+    name: Find Nightly Release
+    runs-on: ubuntu-latest
+    outputs:
+      url: ${{ steps.get-url.outputs.nightly-url }}
+    steps:
+      - name: Get Nightly Release URL
+        id: get-url
+        env:
+          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
+        shell: bash
+        # This workflow step gets an unstable testing version of the CodeQL CLI. It should not be used outside of these tests.
+        run: |
+          LATEST=`gh api repos/dsp-testing/codeql-cli-nightlies/releases --jq '.[].tag_name' --method GET --raw-field 'per_page=1'`
+          echo "::set-output name=nightly-url::https://github.com/dsp-testing/codeql-cli-nightlies/releases/download/$LATEST"
+
   test:
     name: Test
     runs-on: ${{ matrix.os }}
+    needs: [find-nightly]
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
+        version: [stable, nightly]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -52,46 +83,130 @@ jobs:
 
       - uses: actions/setup-node@v1
         with:
-          node-version: '10.18.1'
+          node-version: '14.14.0'
 
-      # We have to build the dependencies in `lib` before running any tests.
-      - name: Build
+      - name: Install dependencies
+        working-directory: extensions/ql-vscode
         run: |
-          cd build
           npm install
-          npm run build-ci
         shell: bash
 
+      - name: Build
+        working-directory: extensions/ql-vscode
+        env:
+          APP_INSIGHTS_KEY: '${{ secrets.APP_INSIGHTS_KEY }}'
+        run: |
+          npm run build
+        shell: bash
+
+      - name: Lint
+        working-directory: extensions/ql-vscode
+        run: |
+          npm run lint
+
       - name: Install CodeQL
         run: |
           mkdir codeql-home
-          curl -L --silent https://github.com/github/codeql-cli-binaries/releases/latest/download/codeql.zip -o codeql-home/codeql.zip
+          if [ ${{ matrix.version }} = "stable" ]
+          then
+            curl -L --silent https://github.com/github/codeql-cli-binaries/releases/latest/download/codeql.zip -o codeql-home/codeql.zip
+          else
+            curl -L --silent ${{ needs.find-nightly.outputs.url }}/codeql.zip -o codeql-home/codeql.zip
+          fi
           unzip -q -o codeql-home/codeql.zip -d codeql-home
+          unzip -q -o codeql-home/codeql.zip codeql/codeql.exe -d codeql-home
           rm codeql-home/codeql.zip
         shell: bash
 
       - name: Run unit tests (Linux)
+        working-directory: extensions/ql-vscode
         if: matrix.os == 'ubuntu-latest'
         run: |
-          cd extensions/ql-vscode
           CODEQL_PATH=$GITHUB_WORKSPACE/codeql-home/codeql/codeql npm run test
 
       - name: Run unit tests (Windows)
         if: matrix.os == 'windows-latest'
+        working-directory: extensions/ql-vscode
         run: |
-          cd extensions/ql-vscode
           $env:CODEQL_PATH=$(Join-Path $env:GITHUB_WORKSPACE -ChildPath 'codeql-home/codeql/codeql.exe')
           npm run test
 
       - name: Run integration tests (Linux)
         if: matrix.os == 'ubuntu-latest'
+        working-directory: extensions/ql-vscode
         run: |
-          cd extensions/ql-vscode
           sudo apt-get install xvfb
           /usr/bin/xvfb-run npm run integration
 
       - name: Run integration tests (Windows)
         if: matrix.os == 'windows-latest'
+        working-directory: extensions/ql-vscode
         run: |
-          cd extensions/ql-vscode
           npm run integration
+
+  cli-test:
+    name: CLI Test
+    runs-on: ${{ matrix.os }}
+    needs: [find-nightly]
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        version: ['v2.3.3', 'v2.4.6', 'v2.5.9', 'v2.6.3', 'nightly']
+    env:
+      CLI_VERSION: ${{ matrix.version }}
+      NIGHTLY_URL: ${{ needs.find-nightly.outputs.url }}
+      TEST_CODEQL_PATH: '${{ github.workspace }}/codeql'
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '14.14.0'
+
+      - name: Install dependencies
+        working-directory: extensions/ql-vscode
+        run: |
+          npm install
+        shell: bash
+
+      - name: Build
+        working-directory: extensions/ql-vscode
+        run: |
+          npm run build
+        shell: bash
+
+      - name: Decide on ref of CodeQL repo
+        id: choose-ref
+        shell: bash
+        run: |
+          if [[ "${{ matrix.version }}" == "nightly" ]]
+          then
+            REF="codeql-cli/latest"
+          elif [[ "${{ matrix.version }}" == "v2.2.6" || "${{ matrix.version }}" == "v2.3.3" ]]
+          then
+            REF="codeql-cli/v2.4.5"
+          else
+            REF="codeql-cli/${{ matrix.version }}"
+          fi
+          echo "::set-output name=ref::$REF"
+
+      - name: Checkout QL
+        uses: actions/checkout@v2
+        with:
+          repository: github/codeql
+          ref: ${{ steps.choose-ref.outputs.ref }}
+          path: codeql
+
+      - name: Run CLI tests (Linux)
+        working-directory: extensions/ql-vscode
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          /usr/bin/xvfb-run npm run cli-integration
+
+      - name: Run CLI tests (Windows)
+        working-directory: extensions/ql-vscode
+        if: matrix.os == 'windows-latest'
+        run: |
+          npm run cli-integration

.github/workflows/release.yml

@@ -6,25 +6,16 @@
 
 name: Release
 on:
+  workflow_dispatch:
+
   push:
-    # Path filters are not evaluated for pushes to tags.
-    # (source: https://help.github.com/en/github/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#onpushpull_requestpaths)
-    # So this workflow is triggered in the following events:
-    # - Release event: a SemVer tag, e.g. v1.0.0 or v1.0.0-alpha, is pushed
     tags:
       - 'v[0-9]+.[0-9]+.[0-9]+*'
-    # OR
-    # - Test event: this file is modified on a branch in the main repo containing `/actions/` in the name.
-    branches:
-      - '**/actions/**'
-    paths:
-      - '**/workflows/release.yml'
 
 jobs:
   build:
     name: Release
     runs-on: ubuntu-latest
-    # TODO Share steps with the main workflow.
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -33,12 +24,19 @@ jobs:
         with:
           node-version: '10.18.1'
 
-      - name: Build
+      - name: Install dependencies
         run: |
-          cd build
-          npm install
-          # Release build instead of dev build.
-          npm run build-release
+          cd extensions/ql-vscode
+          npm ci
+        shell: bash
+
+      - name: Build
+        env:
+          APP_INSIGHTS_KEY: '${{ secrets.APP_INSIGHTS_KEY }}'
+        run: |
+          echo "APP INSIGHTS KEY LENGTH: ${#APP_INSIGHTS_KEY}"
+          cd extensions/ql-vscode
+          npm run build -- --release
         shell: bash
 
       - name: Prepare artifacts
@@ -55,11 +53,8 @@ jobs:
           REF_NAME="$(echo ${{ github.ref }} | sed -e 's:^refs/tags/::' | sed -e 's:/:-:g')"
           echo "::set-output name=ref_name::$REF_NAME"
 
-      # Uploading artifacts is not necessary to create a release.
-      # This is just in case the release itself fails and we want to access the built artifacts from Actions.
-      # TODO Remove if not useful.
       - name: Upload artifacts
-        uses: actions/upload-artifact@master
+        uses: actions/upload-artifact@v2
         with:
           name: vscode-codeql-extension
           path: artifacts
@@ -93,12 +88,16 @@ jobs:
           asset_name: ${{ format('vscode-codeql-{0}.vsix', steps.prepare-artifacts.outputs.ref_name) }}
           asset_content_type: application/zip
 
-      # The checkout action does not fetch the master branch.
-      # Fetch the master branch so that we can base the version bump PR against master.
-      - name: Fetch master branch
+      ###
+      # Do Post release work: version bump and changelog PR
+      # Only do this if we are running from a PR (ie- this is part of the release process)
+
+      # The checkout action does not fetch the main branch.
+      # Fetch the main branch so that we can base the version bump PR against main.
+      - name: Fetch main branch
         run: |
-          git fetch --depth=1 origin master:master
-          git checkout master
+          git fetch --depth=1 origin main:main
+          git checkout main
 
       - name: Bump patch version
         id: bump-patch-version
@@ -110,8 +109,14 @@ jobs:
           NEXT_VERSION="$(npm version patch)"
           echo "::set-output name=next_version::$NEXT_VERSION"
 
+      - name: Add changelog for next release
+        if: success()
+        run: |
+          cd extensions/ql-vscode
+          perl -i -pe 's/^/## \[UNRELEASED\]\n\n/ if($.==3)' CHANGELOG.md
+
       - name: Create version bump PR
-        uses: peter-evans/create-pull-request@c7b64af0a489eae91f7890f2c1b63d13cc2d8ab7 # v2.4.2
+        uses: peter-evans/create-pull-request@c7f493a8000b8aeb17a1332e326ba76b57cb83eb # v3.4.1
         if: success()
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -119,4 +124,42 @@ jobs:
           title: Bump version to ${{ steps.bump-patch-version.outputs.next_version }}
           body: This PR was automatically generated by the GitHub Actions release workflow in this repository.
           branch: ${{ format('version/bump-to-{0}', steps.bump-patch-version.outputs.next_version) }}
-          base: master
+          base: main
+          draft: true
+
+  vscode-publish:
+    name: Publish to VS Code Marketplace
+    needs: build
+    environment: publish-vscode-marketplace
+    runs-on: ubuntu-latest
+    env:
+      VSCE_TOKEN: ${{ secrets.VSCE_TOKEN }}
+    steps:
+      - name: Download artifact
+        uses: actions/download-artifact@v2
+        with:
+          name: vscode-codeql-extension
+
+      - name: Publish to Registry
+        run: |
+          npx vsce publish -p $VSCE_TOKEN --packagePath *.vsix || \
+            echo "Failed to publish to VS Code Marketplace. \
+                  If this was an authentication problem, please make sure the \
+                  auth token hasn't expired."
+
+  open-vsx-publish:
+    name: Publish to Open VSX Registry
+    needs: build
+    environment: publish-open-vsx
+    runs-on: ubuntu-latest
+    env:
+      OPEN_VSX_TOKEN: ${{ secrets.OPEN_VSX_TOKEN }}
+    steps:
+      - name: Download artifact
+        uses: actions/download-artifact@v2
+        with:
+          name: vscode-codeql-extension
+
+      - name: Publish to Registry
+        run: |
+          npx ovsx publish -p $OPEN_VSX_TOKEN *.vsix

.gitignore

@@ -4,6 +4,7 @@
 # Generated files
 /dist/
 out/
+build/
 server/
 node_modules/
 gen/

.vscode/extensions.json

@@ -1,10 +1,12 @@
 {
-  // See http://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+  // See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
   // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
   // List of extensions which should be recommended for users of this workspace.
   "recommendations": [
-    "eamodio.tsl-problem-matcher"
+    "eamodio.tsl-problem-matcher",
+    "dbaeumer.vscode-eslint",
+    "eternalphane.tsfmt-vscode"
   ],
   // List of extensions recommended by VS Code that should not be recommended for users of this workspace.
   "unwantedRecommendations": []
-}
+}

.vscode/launch.json

@@ -8,19 +8,20 @@
       "request": "launch",
       "runtimeExecutable": "${execPath}",
       "args": [
-        "--extensionDevelopmentPath=${workspaceRoot}/dist/vscode-codeql",
-        "${workspaceRoot}/../vscode-codeql-starter/vscode-codeql-starter.code-workspace"
+        "--extensionDevelopmentPath=${workspaceRoot}/extensions/ql-vscode",
+        // Add a reference to a workspace to open. Eg-
+        // "${workspaceRoot}/../vscode-codeql-starter/vscode-codeql-starter.code-workspace"
       ],
       "stopOnEntry": false,
       "sourceMaps": true,
       "outFiles": [
-        "${workspaceRoot}/dist/vscode-codeql/out/**/*.js",
-        "${workspaceRoot}/dist/vscode-codeql/node_modules/semmle-bqrs/out/**/*.js",
-        "${workspaceRoot}/dist/vscode-codeql/node_modules/semmle-io/out/**/*.js",
-        "${workspaceRoot}/dist/vscode-codeql/node_modules/semmle-io-node/out/**/*.js",
-        "${workspaceRoot}/dist/vscode-codeql/node_modules/semmle-vscode-utils/out/**/*.js"
+        "${workspaceRoot}/extensions/ql-vscode/out/**/*.js",
       ],
-      "preLaunchTask": "Build"
+      "env": {
+        // change to 'true' debug the IDE or Query servers
+        "IDE_SERVER_JAVA_DEBUG": "false",
+        "QUERY_SERVER_JAVA_DEBUG": "false",
+      }
     },
     {
       "name": "Launch Unit Tests (vscode-codeql)",
@@ -45,7 +46,6 @@
       "port": 9229,
       "stopOnEntry": false,
       "sourceMaps": true,
-      "preLaunchTask": "Build",
       "console": "integratedTerminal",
       "internalConsoleOptions": "neverOpen"
     },
@@ -55,16 +55,14 @@
       "request": "launch",
       "runtimeExecutable": "${execPath}",
       "args": [
-        "--extensionDevelopmentPath=${workspaceRoot}/dist/vscode-codeql",
+        "--extensionDevelopmentPath=${workspaceRoot}/extensions/ql-vscode",
         "--extensionTestsPath=${workspaceRoot}/extensions/ql-vscode/out/vscode-tests/no-workspace/index"
       ],
       "stopOnEntry": false,
       "sourceMaps": true,
       "outFiles": [
-        "${workspaceRoot}/dist/vscode-codeql/out/**/*.js",
-        "${workspaceRoot}/extensions/ql-vscode/out/vscode-tests/**/*.js"
+        "${workspaceRoot}/extensions/ql-vscode/out/**/*.js",
       ],
-      "preLaunchTask": "Build"
     },
     {
       "name": "Launch Integration Tests - Minimal Workspace (vscode-codeql)",
@@ -72,17 +70,34 @@
       "request": "launch",
       "runtimeExecutable": "${execPath}",
       "args": [
-        "--extensionDevelopmentPath=${workspaceRoot}/dist/vscode-codeql",
+        "--extensionDevelopmentPath=${workspaceRoot}/extensions/ql-vscode",
         "--extensionTestsPath=${workspaceRoot}/extensions/ql-vscode/out/vscode-tests/minimal-workspace/index",
         "${workspaceRoot}/extensions/ql-vscode/test/data"
       ],
       "stopOnEntry": false,
       "sourceMaps": true,
       "outFiles": [
-        "${workspaceRoot}/dist/vscode-codeql/out/**/*.js",
-        "${workspaceRoot}/extensions/ql-vscode/out/vscode-tests/**/*.js"
+        "${workspaceRoot}/extensions/ql-vscode/out/**/*.js",
+      ],
+    },
+    {
+      "name": "Launch Integration Tests - With CLI",
+      "type": "extensionHost",
+      "request": "launch",
+      "runtimeExecutable": "${execPath}",
+      "args": [
+        "--extensionDevelopmentPath=${workspaceRoot}/extensions/ql-vscode",
+        "--extensionTestsPath=${workspaceRoot}/extensions/ql-vscode/out/vscode-tests/cli-integration/index",
+        "${workspaceRoot}/extensions/ql-vscode/src/vscode-tests/cli-integration/data",
+        // Add a path to a checked out instance of the codeql repository so the libraries are
+        // available in the workspace for the tests.
+        // "${workspaceRoot}/../codeql"
+      ],
+      "stopOnEntry": false,
+      "sourceMaps": true,
+      "outFiles": [
+        "${workspaceRoot}/extensions/ql-vscode/out/**/*.js",
       ],
-      "preLaunchTask": "Build"
     }
   ]
 }

.vscode/settings.json

@@ -22,7 +22,8 @@
     "common/temp": true,
     "**/.vscode-test": true
   },
-  "typescript.tsdk": "./common/temp/node_modules/typescript/lib", // we want to use the TS server from our node_modules folder to control its version
+  "typescript.tsdk": "./extensions/ql-vscode/node_modules/typescript/lib", // we want to use the TS server from our node_modules folder to control its version
+  "typescript.enablePromptUseWorkspaceTsdk": true,
   "eslint.validate": [
     "javascript",
     "javascriptreact",
@@ -32,5 +33,9 @@
   "eslint.options": {
     // This is necessary so that eslint can properly resolve its plugins
     "resolvePluginsRelativeTo": "./extensions/ql-vscode"
-  }
+  },
+  "editor.formatOnSave": false,
+  "typescript.preferences.quoteStyle": "single",
+  "javascript.preferences.quoteStyle": "single",
+  "editor.wordWrapColumn": 100
 }

.vscode/tasks.json

@@ -10,7 +10,10 @@
         "kind": "build",
         "isDefault": true
       },
-      "command": "node common/scripts/install-run-rush.js build --verbose",
+      "command": "npm run build",
+      "options": {
+        "cwd": "extensions/ql-vscode/"
+      },
       "presentation": {
         "echo": true,
         "reveal": "always",
@@ -33,64 +36,13 @@
         "$ts-webpack"
       ]
     },
-    {
-      "label": "Rebuild",
-      "type": "shell",
-      "group": "build",
-      "command": "node common/scripts/install-run-rush.js rebuild --verbose",
-      "presentation": {
-        "echo": true,
-        "reveal": "always",
-        "focus": false,
-        "panel": "shared",
-        "showReuseMessage": true,
-        "clear": true
-      },
-      "problemMatcher": [
-        {
-          "owner": "typescript",
-          "fileLocation": "absolute",
-          "pattern": {
-            "regexp": "^\\[gulp-typescript\\] ([^(]+)\\((\\d+|\\d+,\\d+|\\d+,\\d+,\\d+,\\d+)\\): error TS\\d+: (.*)$",
-            "file": 1,
-            "location": 2,
-            "message": 3
-          }
-        }
-      ]
-    },
-    {
-      "label": "Update",
-      "type": "shell",
-      "command": "node common/scripts/install-run-rush.js update",
-      "presentation": {
-        "echo": true,
-        "reveal": "always",
-        "focus": false,
-        "panel": "shared",
-        "showReuseMessage": true,
-        "clear": true
-      },
-      "problemMatcher": []
-    },
-    {
-      "label": "Update (full)",
-      "type": "shell",
-      "command": "node common/scripts/install-run-rush.js update --full",
-      "presentation": {
-        "echo": true,
-        "reveal": "always",
-        "focus": false,
-        "panel": "shared",
-        "showReuseMessage": true,
-        "clear": true
-      },
-      "problemMatcher": []
-    },
     {
       "label": "Format",
       "type": "shell",
-      "command": "node common/scripts/install-run-rush.js format",
+      "command": "npm run format",
+      "options": {
+        "cwd": "extensions/ql-vscode/"
+      },
       "presentation": {
         "echo": true,
         "reveal": "always",
@@ -111,4 +63,4 @@
       "group": "build"
     }
   ]
-}
+}

CODEOWNERS

@@ -0,0 +1 @@
+**/* @github/codeql-vscode-reviewers

CONTRIBUTING.md

@@ -25,94 +25,41 @@ Here are a few things you can do that will increase the likelihood of your pull
 * Follow the [style guide][style].
 * Write tests. Tests that don't require the VS Code API are located [here](extensions/ql-vscode/test). Integration tests that do require the VS Code API are located [here](extensions/ql-vscode/src/vscode-tests).
 * Keep your change as focused as possible. If there are multiple changes you would like to make that are not dependent upon each other, consider submitting them as separate pull requests.
-* Write a [good commit message](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
+* Write a [good commit message](https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
 
 ## Setting up a local build
 
-Make sure you have a fairly recent version of vscode (>1.32) and are using nodejs
-version >=v10.13.0. (Tested on v10.15.1 and v10.16.0).
+Make sure you have installed recent versions of vscode (>= v1.52), node (>=12.16), and npm (>= 7.5.2). Earlier versions will probably work, but we no longer test against them.
 
-This repo uses [Rush](https://rushjs.io) to handle package management, building, and other
-operations across multiple projects. See the Rush "[Getting started as a developer](https://rushjs.io/pages/developer/new_developer/)" docs
-for more details.
+### Installing all packages
 
-If you plan on building from the command line, it's easiest if Rush is installed globally:
+From the command line, go to the directory `extensions/ql-vscode` and run
 
 ```shell
-npm install -g @microsoft/rush
+npm install
 ```
 
-To get started, run:
+### Building the extension
+
+From the command line, go to the directory `extensions/ql-vscode` and run
 
 ```shell
-rush update && rush build
+npm run build
+npm run watch
 ```
 
-Note that when you run the `rush` command from the globally installed version, it will examine the
-`rushVersion` property in the repo's `rush.json`, and if it differs from the globally installed
-version, it will download, cache, and run the version of Rush specified in the `rushVersion`
-property.
+Alternatively, you can build the extension within VS Code via `Terminal > Run Build Task...` (or `Ctrl+Shift+B` with the default key bindings). And you can run the watch command via `Terminal > Run Task` and then select `npm watch` from the menu.
 
-A few more things to know about using rush:
+Before running any of the launch commands, be sure to have run the `build` command to ensure that the JavaScript is compiled and the resources are copied to the proper location.
 
-* Avoid running `npm` for any commands that install/link dependencies
-* Instead use the *rush* equivalent: `rush add <package>`, `rush update`, etc.
-* If you plan on only building via VS Code tasks, you don't need Rush installed at all, since those
-tasks run `common/scripts/install-run-rush.js` to bootstrap a locally installed and cached copy of
-Rush.
+We recommend that you keep `npm run watch` running in the backgound and you only need to re-run `npm run build` in the following situations:
 
-### Building
+1. on first checkout
+2. whenever any of the non-TypeScript resources have changed
+3. on any change to files included in one of the webviews
+   - **Important**: This is easy to forget. You must explicitly run `npm run build` whenever one of the files in the webview is changed. These are the files in the `src/view` and `src/compare/view` folders.
 
-#### Installing all packages (instead of `npm install`)
-
-After updating any `package.json` file, or after checking or pulling a new branch, you need to
-make sure all the right npm packages are installed, which you would normally do via `npm install` in
-a single-project repo. With Rush, you need to do an "update" instead:
-
-##### From VS Code
-
-`Terminal > Run Task... > Update`
-
-##### From the command line
-
-```shell
-rush update
-```
-
-#### Building all projects (instead of `gulp`)
-
-Rush builds all projects in the repo, in dependency order, building multiple projects in parallel
-where possible. By default, the build also packages the extension itself into a .vsix file in the
-`dist` directory. To build:
-
-##### From VS Code
-
-`Terminal > Run Build Task...` (or just `Ctrl+Shift+B` with the default key bindings)
-
-##### From the command line
-
-```shell
-rush build --verbose
-```
-
-#### Forcing a clean build
-
-Rush does a reasonable job of detecting on its own which projects need to be rebuilt, but if you need to
-force a full rebuild of all projects:
-
-##### From VS Code
-
-`Terminal > Run Task... > Rebuild`
-
-##### From the command line
-
-```shell
-rush rebuild --verbose
-```
-
-Note that `rush rebuild` performs a complete rebuild, whereas `rush build` performs an incremental build and in many cases will not need to do anything at all.
-
-### Installing
+### Installing the extension
 
 You can install the `.vsix` file from within VS Code itself, from the Extensions container in the sidebar:
 
@@ -144,24 +91,55 @@ Alternatively, you can run the tests inside of vscode. There are several vscode
 
 ## Releasing (write access required)
 
-1. Double-check the `CHANGELOG.md` contains all desired change comments
-   and has the version to be released with date at the top.
-1. Double-check that the extension `package.json` has the version you intend to release.
-   If you are doing a patch release (as opposed to minor or major version) this should already
-   be correct.
-1. Trigger a release build on Actions by adding a new tag on master of the format `vxx.xx.xx`
+1. Double-check the `CHANGELOG.md` contains all desired change comments and has the version to be released with date at the top.
+    * Go through all recent PRs and make sure they are properly accounted for.
+    * Make sure all changelog entries have links back to their PR(s) if appropriate.
+1. Double-check that the extension `package.json` and `package-lock.json` have the version you intend to release. If you are doing a patch release (as opposed to minor or major version) this should already be correct.
+1. Create a PR for this release:
+    * This PR will contain any missing bits from steps 1 and 2. Most of the time, this will just be updating `CHANGELOG.md` with today's date.
+    * Create a new branch for the release named after the new version. For example: `v1.3.6`
+    * Create a new commit with a message the same as the branch name.
+    * Create a PR for this branch.
+    * Wait for the PR to be merged into `main`
+1. Trigger a release build on Actions by adding a new tag on branch `main` named after the release, as above. Note that when you push to upstream, you will need to fully qualify the ref. A command like this will work:
+
+    ```bash
+    git push upstream refs/tags/v1.3.6
+    ```
+
+    * **IMPORTANT** Make sure you are on the `main` branch and your local checkout is fully updated when you add the tag.
+    * If you accidentally add the tag to the wrong ref, you can just force push it to the right one later.
+
 1. Monitor the status of the release build in the `Release` workflow in the Actions tab.
 1. Download the VSIX from the draft GitHub release at the top of [the releases page](https://github.com/github/vscode-codeql/releases) that is created when the release build finishes.
-1. Optionally unzip the `.vsix` and inspect its `package.json` to make sure the version is what you expect,
+1. Unzip the `.vsix` and inspect its `package.json` to make sure the version is what you expect,
    or look at the source if there's any doubt the right code is being shipped.
-1. Log into the [Visual Studio Marketplace](https://marketplace.visualstudio.com/manage/publishers/github).
-1. Click the `...` menu in the CodeQL row and click **Update**.
-1. Drag the `.vsix` file you downloaded from the GitHub release into the Marketplace and click **Upload**.
-1. Go to the draft GitHub release, click 'Edit', add some summary description, and publish it.
+1. Go to the actions tab of the vscode-codeql repository and select the [Release workflow](https://github.com/github/vscode-codeql/actions?query=workflow%3ARelease).
+    - If there is an authentication failure when publishing, be sure to check that the authentication keys haven't expired. See below.
+1. Approve the deployments of the correct Release workflow. This will automatically publish to Open VSX and VS Code Marketplace.
+1. Go to the draft GitHub release in [the releases tab of the repository](https://github.com/github/vscode-codeql/releases), click 'Edit', add some summary description, and publish it.
 1. Confirm the new release is marked as the latest release at <https://github.com/github/vscode-codeql/releases>.
 1. If documentation changes need to be published, notify documentation team that release has been made.
 1. Review and merge the version bump PR that is automatically created by Actions.
 
+## Secrets and authentication for publishing
+
+Repository administrators, will need to manage the authentication keys for publishing to the VS Code marketplace and Open VSX. Each requires an authentication token. The VS Code marketplace token expires yearly.
+
+To regenerate the Open VSX token:
+
+1. Log in to the [user settings page on Open VSX](https://open-vsx.org/user-settings/namespaces).
+1. Make sure you are a member of the GitHub namespace.
+1. Go to the [Access Tokens](https://open-vsx.org/user-settings/tokens) page and generate a new token.
+1. Update the secret in the `publish-open-vsx` environment in the project settings.
+
+To regenerate the VSCode Marketplace token:
+
+1. Follow the instructions on [getting a PAT for Azure DevOps](https://code.visualstudio.com/api/working-with-extensions/publishing-extension#get-a-personal-access-token).
+1. Update the secret in the `publish-vscode-marketplace` environment in the project settings.
+
+Not that Azure DevOps PATs expire yearly and must be regenerated.
+
 ## Resources
 
 * [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)

README.md

@@ -4,7 +4,7 @@ This project is an extension for Visual Studio Code that adds rich language supp
 
 The extension is released. You can download it from the [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=github.vscode-codeql).
 
-To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/master/extensions/ql-vscode/CHANGELOG.md).
+To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/main/extensions/ql-vscode/CHANGELOG.md).
 
 [![CI status badge](https://github.com/github/vscode-codeql/workflows/Build%20Extension/badge.svg)](https://github.com/github/vscode-codeql/actions?query=workflow%3A%22Build+Extension%22+branch%3Amaster)
 [![VS Marketplace badge](https://vsmarketplacebadge.apphb.com/version/github.vscode-codeql.svg)](https://marketplace.visualstudio.com/items?itemName=github.vscode-codeql)
@@ -13,10 +13,9 @@ To see what has changed in the last few versions of the extension, see the [Chan
 
 * Enables you to use CodeQL to query databases and discover problems in codebases.
 * Shows the flow of data through the results of path queries, which is essential for triaging security results.
-* Provides an easy way to run queries from the large, open source repository of [CodeQL security queries](https://github.com/Semmle/ql).
+* Provides an easy way to run queries from the large, open source repository of [CodeQL security queries](https://github.com/github/codeql).
 * Adds IntelliSense to support you writing and editing your own CodeQL query and library files.
 
-
 ## Project goals and scope
 
 This project will track new feature development in CodeQL and, whenever appropriate, bring that functionality to the Visual Studio Code experience.

build/README.md

@@ -1,12 +0,0 @@
-GitHub Actions Build directory
-===
-
-The point of this directory is to allow us to do a local installation *of* the rush
-tool, since 
- - installing globally is not permitted on github actions
- - installing locally in the root directory of the repo creates `node_modules` there,
-   and rush itself gives error messages since it thinks `node_modules` is not supposed 
-   to exist, since rush is supposed to be managing subproject dependencies.
-
-Running rush from a subdirectory searches parent directories for `rush.json`
-and does the build starting from that file's location.

build/package.json

@@ -1,17 +0,0 @@
-{
-  "name": "build",
-  "version": "1.0.0",
-  "description": "",
-  "main": "index.js",
-  "dependencies": {
-    "@microsoft/rush": "^5.10.3"
-  },
-  "devDependencies": {},
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
-    "build": "rush update && rush build",
-    "build-ci": "rush install && rush build",
-    "build-release": "rush install && rush build --release"
-  },
-  "author": "GitHub"
-}

common/config/LICENSE

@@ -1,28 +0,0 @@
-This directory contains content from https://github.com/microsoft/rushstack,
-used under the MIT license as follows.
-See https://github.com/microsoft/rushstack/blob/master/stack/rush-stack/LICENSE.
-
-@microsoft/rush-stack
-
-Copyright (c) Microsoft Corporation. All rights reserved.
-
-MIT License
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

common/config/rush/.npmrc

@@ -1,12 +0,0 @@
-# Rush uses this file to configure the package registry, regardless of whether the
-# package manager is PNPM, NPM, or Yarn.  Prior to invoking the package manager,
-# Rush will always copy this file to the folder where installation is performed.
-# When NPM is the package manager, Rush works around NPM's processing of
-# undefined environment variables by deleting any lines that reference undefined
-# environment variables.
-#
-# DO NOT SPECIFY AUTHENTICATION CREDENTIALS IN THIS FILE.  It should only be used
-# to configure registry sources.
-
-registry=https://registry.npmjs.org/
-always-auth=false

common/config/rush/command-line.json

@@ -1,32 +0,0 @@
-/**
- * This configuration file defines custom commands for the "rush" command-line.
- * For full documentation, please see https://rushjs.io/pages/configs/command_line_json/
- */
-{
-  "$schema": "https://developer.microsoft.com/json-schemas/rush/v5/command-line.schema.json",
-  "commands": [
-    {
-      "commandKind": "bulk",
-      "name": "format",
-      "summary": "Reformat source code in all projects",
-      "description": "Runs the `format` npm task in each project, if present.",
-      "safeForSimultaneousRushProcesses": false,
-      "enableParallelism": true,
-      "ignoreDependencyOrder": true,
-      "ignoreMissingScript": true,
-      "allowWarningsInSuccessfulBuild": false
-    }
-  ],
-  "parameters": [
-    {
-      "parameterKind": "flag",
-      "longName": "--release",
-      "shortName": "-r",
-      "description": "Perform a release build",
-      "associatedCommands": [
-        "build",
-        "rebuild"
-      ],
-    }
-  ]
-}

common/config/rush/common-versions.json

@@ -1,43 +0,0 @@
-/**
- * This configuration file specifies NPM dependency version selections that affect all projects
- * in a Rush repo.  For full documentation, please see https://rushjs.io
- */
-{
-  "$schema": "https://developer.microsoft.com/json-schemas/rush/v5/common-versions.schema.json",
-
-  /**
-   * A table that specifies a "preferred version" for a dependency package. The "preferred version"
-   * is typically used to hold an indirect dependency back to a specific version, however generally
-   * it can be any SemVer range specifier (e.g. "~1.2.3"), and it will narrow any (compatible)
-   * SemVer range specifier.  See the Rush documentation for details about this feature.
-   */
-  "preferredVersions": {
-
-    /**
-     * When someone asks for "^1.0.0" make sure they get "1.2.3" when working in this repo,
-     * instead of the latest version.
-     */
-    // "some-library": "1.2.3"
-  },
-
-  /**
-   * The "rush check" command can be used to enforce that every project in the repo must specify
-   * the same SemVer range for a given dependency.  However, sometimes exceptions are needed.
-   * The allowedAlternativeVersions table allows you to list other SemVer ranges that will be
-   * accepted by "rush check" for a given dependency.
-   *
-   * IMPORTANT: THIS TABLE IS FOR *ADDITIONAL* VERSION RANGES THAT ARE ALTERNATIVES TO THE
-   * USUAL VERSION (WHICH IS INFERRED BY LOOKING AT ALL PROJECTS IN THE REPO).
-   * This design avoids unnecessary churn in this file.
-   */
-   "allowedAlternativeVersions": {
-
-    /**
-     * For example, allow some projects to use an older TypeScript compiler
-     * (in addition to whatever "usual" version is being used by other projects in the repo):
-     */
-    // "typescript": [
-    //   "~2.4.0"
-    // ]
-  }
-}

common/config/rush/pnpmfile.js

@@ -1,32 +0,0 @@
-"use strict";
-
-/**
- * When using the PNPM package manager, you can use pnpmfile.js to workaround
- * dependencies that have mistakes in their package.json file.  (This feature is
- * functionally similar to Yarn's "resolutions".)
- *
- * For details, see the PNPM documentation:
- * https://pnpm.js.org/docs/en/hooks.html
- *
- * IMPORTANT: SINCE THIS FILE CONTAINS EXECUTABLE CODE, MODIFYING IT IS LIKELY
- * TO INVALIDATE ANY CACHED DEPENDENCY ANALYSIS.  We recommend to run "rush update --full"
- * after any modification to pnpmfile.js.
- *
- */
-module.exports = {
-  hooks: {
-    readPackage
-  }
-};
-
-/**
- * This hook is invoked during installation before a package's dependencies
- * are selected.
- * The `packageJson` parameter is the deserialized package.json
- * contents for the package that is about to be installed.
- * The `context` parameter provides a log() function.
- * The return value is the updated object.
- */
-function readPackage(packageJson, context) {
-  return packageJson;
-}

common/config/rush/version-policies.json

@@ -1,6 +0,0 @@
-/**
- * This is configuration file is used for advanced publishing configurations with Rush.
- * For full documentation, please see https://rushjs.io/pages/configs/version_policies_json/
- */
-
-[]

common/scripts/install-run-rush.js

@@ -1,67 +0,0 @@
-"use strict";
-// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
-// See the @microsoft/rush package's LICENSE file for license information.
-Object.defineProperty(exports, "__esModule", { value: true });
-// THIS FILE WAS GENERATED BY A TOOL. ANY MANUAL MODIFICATIONS WILL GET OVERWRITTEN WHENEVER RUSH IS UPGRADED.
-//
-// This script is intended for usage in an automated build environment where the Rush command may not have
-// been preinstalled, or may have an unpredictable version.  This script will automatically install the version of Rush
-// specified in the rush.json configuration file (if not already installed), and then pass a command-line to it.
-// An example usage would be:
-//
-//    node common/scripts/install-run-rush.js install
-//
-// For more information, see: https://rushjs.io/pages/maintainer/setup_new_repo/
-const path = require("path");
-const fs = require("fs");
-const install_run_1 = require("./install-run");
-const PACKAGE_NAME = '@microsoft/rush';
-const RUSH_PREVIEW_VERSION = 'RUSH_PREVIEW_VERSION';
-function _getRushVersion() {
-    const rushPreviewVersion = process.env[RUSH_PREVIEW_VERSION];
-    if (rushPreviewVersion !== undefined) {
-        console.log(`Using Rush version from environment variable ${RUSH_PREVIEW_VERSION}=${rushPreviewVersion}`);
-        return rushPreviewVersion;
-    }
-    const rushJsonFolder = install_run_1.findRushJsonFolder();
-    const rushJsonPath = path.join(rushJsonFolder, install_run_1.RUSH_JSON_FILENAME);
-    try {
-        const rushJsonContents = fs.readFileSync(rushJsonPath, 'utf-8');
-        // Use a regular expression to parse out the rushVersion value because rush.json supports comments,
-        // but JSON.parse does not and we don't want to pull in more dependencies than we need to in this script.
-        const rushJsonMatches = rushJsonContents.match(/\"rushVersion\"\s*\:\s*\"([0-9a-zA-Z.+\-]+)\"/);
-        return rushJsonMatches[1];
-    }
-    catch (e) {
-        throw new Error(`Unable to determine the required version of Rush from rush.json (${rushJsonFolder}). ` +
-            'The \'rushVersion\' field is either not assigned in rush.json or was specified ' +
-            'using an unexpected syntax.');
-    }
-}
-function _run() {
-    const [nodePath, /* Ex: /bin/node */ scriptPath, /* /repo/common/scripts/install-run-rush.js */ ...packageBinArgs /* [build, --to, myproject] */] = process.argv;
-    // Detect if this script was directly invoked, or if the install-run-rushx script was invokved to select the
-    // appropriate binary inside the rush package to run
-    const scriptName = path.basename(scriptPath);
-    const bin = scriptName.toLowerCase() === 'install-run-rushx.js' ? 'rushx' : 'rush';
-    if (!nodePath || !scriptPath) {
-        throw new Error('Unexpected exception: could not detect node path or script path');
-    }
-    if (process.argv.length < 3) {
-        console.log(`Usage: ${scriptName} <command> [args...]`);
-        if (scriptName === 'install-run-rush.js') {
-            console.log(`Example: ${scriptName} build --to myproject`);
-        }
-        else {
-            console.log(`Example: ${scriptName} custom-command`);
-        }
-        process.exit(1);
-    }
-    install_run_1.runWithErrorAndStatusCode(() => {
-        const version = _getRushVersion();
-        console.log(`The rush.json configuration requests Rush version ${version}`);
-        return install_run_1.installAndRun(PACKAGE_NAME, version, bin, packageBinArgs);
-    });
-}
-_run();
-//# sourceMappingURL=install-run-rush.js.map

common/scripts/install-run-rushx.js

@@ -1,18 +0,0 @@
-"use strict";
-// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
-// See the @microsoft/rush package's LICENSE file for license information.
-Object.defineProperty(exports, "__esModule", { value: true });
-// THIS FILE WAS GENERATED BY A TOOL. ANY MANUAL MODIFICATIONS WILL GET OVERWRITTEN WHENEVER RUSH IS UPGRADED.
-//
-// This script is intended for usage in an automated build environment where the Rush command may not have
-// been preinstalled, or may have an unpredictable version.  This script will automatically install the version of Rush
-// specified in the rush.json configuration file (if not already installed), and then pass a command-line to the
-// rushx command.
-//
-// An example usage would be:
-//
-//    node common/scripts/install-run-rushx.js custom-command
-//
-// For more information, see: https://rushjs.io/pages/maintainer/setup_new_repo/
-require("./install-run-rush");
-//# sourceMappingURL=install-run-rushx.js.map

common/scripts/install-run.js

@@ -1,433 +0,0 @@
-"use strict";
-// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
-// See the @microsoft/rush package's LICENSE file for license information.
-Object.defineProperty(exports, "__esModule", { value: true });
-// THIS FILE WAS GENERATED BY A TOOL. ANY MANUAL MODIFICATIONS WILL GET OVERWRITTEN WHENEVER RUSH IS UPGRADED.
-//
-// This script is intended for usage in an automated build environment where a Node tool may not have
-// been preinstalled, or may have an unpredictable version.  This script will automatically install the specified
-// version of the specified tool (if not already installed), and then pass a command-line to it.
-// An example usage would be:
-//
-//    node common/scripts/install-run.js qrcode@1.2.2 qrcode https://rushjs.io
-//
-// For more information, see: https://rushjs.io/pages/maintainer/setup_new_repo/
-const childProcess = require("child_process");
-const fs = require("fs");
-const os = require("os");
-const path = require("path");
-exports.RUSH_JSON_FILENAME = 'rush.json';
-const RUSH_TEMP_FOLDER_ENV_VARIABLE_NAME = 'RUSH_TEMP_FOLDER';
-const INSTALLED_FLAG_FILENAME = 'installed.flag';
-const NODE_MODULES_FOLDER_NAME = 'node_modules';
-const PACKAGE_JSON_FILENAME = 'package.json';
-/**
- * Parse a package specifier (in the form of name\@version) into name and version parts.
- */
-function _parsePackageSpecifier(rawPackageSpecifier) {
-    rawPackageSpecifier = (rawPackageSpecifier || '').trim();
-    const separatorIndex = rawPackageSpecifier.lastIndexOf('@');
-    let name;
-    let version = undefined;
-    if (separatorIndex === 0) {
-        // The specifier starts with a scope and doesn't have a version specified
-        name = rawPackageSpecifier;
-    }
-    else if (separatorIndex === -1) {
-        // The specifier doesn't have a version
-        name = rawPackageSpecifier;
-    }
-    else {
-        name = rawPackageSpecifier.substring(0, separatorIndex);
-        version = rawPackageSpecifier.substring(separatorIndex + 1);
-    }
-    if (!name) {
-        throw new Error(`Invalid package specifier: ${rawPackageSpecifier}`);
-    }
-    return { name, version };
-}
-/**
- * As a workaround, copyAndTrimNpmrcFile() copies the .npmrc file to the target folder, and also trims
- * unusable lines from the .npmrc file.
- *
- * Why are we trimming the .npmrc lines?  NPM allows environment variables to be specified in
- * the .npmrc file to provide different authentication tokens for different registry.
- * However, if the environment variable is undefined, it expands to an empty string, which
- * produces a valid-looking mapping with an invalid URL that causes an error.  Instead,
- * we'd prefer to skip that line and continue looking in other places such as the user's
- * home directory.
- *
- * IMPORTANT: THIS CODE SHOULD BE KEPT UP TO DATE WITH Utilities._copyNpmrcFile()
- */
-function _copyAndTrimNpmrcFile(sourceNpmrcPath, targetNpmrcPath) {
-    console.log(`Copying ${sourceNpmrcPath} --> ${targetNpmrcPath}`); // Verbose
-    let npmrcFileLines = fs.readFileSync(sourceNpmrcPath).toString().split('\n');
-    npmrcFileLines = npmrcFileLines.map((line) => (line || '').trim());
-    const resultLines = [];
-    // Trim out lines that reference environment variables that aren't defined
-    for (const line of npmrcFileLines) {
-        // This finds environment variable tokens that look like "${VAR_NAME}"
-        const regex = /\$\{([^\}]+)\}/g;
-        const environmentVariables = line.match(regex);
-        let lineShouldBeTrimmed = false;
-        if (environmentVariables) {
-            for (const token of environmentVariables) {
-                // Remove the leading "${" and the trailing "}" from the token
-                const environmentVariableName = token.substring(2, token.length - 1);
-                if (!process.env[environmentVariableName]) {
-                    lineShouldBeTrimmed = true;
-                    break;
-                }
-            }
-        }
-        if (lineShouldBeTrimmed) {
-            // Example output:
-            // "; MISSING ENVIRONMENT VARIABLE: //my-registry.com/npm/:_authToken=${MY_AUTH_TOKEN}"
-            resultLines.push('; MISSING ENVIRONMENT VARIABLE: ' + line);
-        }
-        else {
-            resultLines.push(line);
-        }
-    }
-    fs.writeFileSync(targetNpmrcPath, resultLines.join(os.EOL));
-}
-/**
- * syncNpmrc() copies the .npmrc file to the target folder, and also trims unusable lines from the .npmrc file.
- * If the source .npmrc file not exist, then syncNpmrc() will delete an .npmrc that is found in the target folder.
- *
- * IMPORTANT: THIS CODE SHOULD BE KEPT UP TO DATE WITH Utilities._syncNpmrc()
- */
-function _syncNpmrc(sourceNpmrcFolder, targetNpmrcFolder, useNpmrcPublish) {
-    const sourceNpmrcPath = path.join(sourceNpmrcFolder, !useNpmrcPublish ? '.npmrc' : '.npmrc-publish');
-    const targetNpmrcPath = path.join(targetNpmrcFolder, '.npmrc');
-    try {
-        if (fs.existsSync(sourceNpmrcPath)) {
-            _copyAndTrimNpmrcFile(sourceNpmrcPath, targetNpmrcPath);
-        }
-        else if (fs.existsSync(targetNpmrcPath)) {
-            // If the source .npmrc doesn't exist and there is one in the target, delete the one in the target
-            console.log(`Deleting ${targetNpmrcPath}`); // Verbose
-            fs.unlinkSync(targetNpmrcPath);
-        }
-    }
-    catch (e) {
-        throw new Error(`Error syncing .npmrc file: ${e}`);
-    }
-}
-let _npmPath = undefined;
-/**
- * Get the absolute path to the npm executable
- */
-function getNpmPath() {
-    if (!_npmPath) {
-        try {
-            if (os.platform() === 'win32') {
-                // We're on Windows
-                const whereOutput = childProcess.execSync('where npm', { stdio: [] }).toString();
-                const lines = whereOutput.split(os.EOL).filter((line) => !!line);
-                // take the last result, we are looking for a .cmd command
-                // see https://github.com/microsoft/rushstack/issues/759
-                _npmPath = lines[lines.length - 1];
-            }
-            else {
-                // We aren't on Windows - assume we're on *NIX or Darwin
-                _npmPath = childProcess.execSync('which npm', { stdio: [] }).toString();
-            }
-        }
-        catch (e) {
-            throw new Error(`Unable to determine the path to the NPM tool: ${e}`);
-        }
-        _npmPath = _npmPath.trim();
-        if (!fs.existsSync(_npmPath)) {
-            throw new Error('The NPM executable does not exist');
-        }
-    }
-    return _npmPath;
-}
-exports.getNpmPath = getNpmPath;
-function _ensureFolder(folderPath) {
-    if (!fs.existsSync(folderPath)) {
-        const parentDir = path.dirname(folderPath);
-        _ensureFolder(parentDir);
-        fs.mkdirSync(folderPath);
-    }
-}
-/**
- * Create missing directories under the specified base directory, and return the resolved directory.
- *
- * Does not support "." or ".." path segments.
- * Assumes the baseFolder exists.
- */
-function _ensureAndJoinPath(baseFolder, ...pathSegments) {
-    let joinedPath = baseFolder;
-    try {
-        for (let pathSegment of pathSegments) {
-            pathSegment = pathSegment.replace(/[\\\/]/g, '+');
-            joinedPath = path.join(joinedPath, pathSegment);
-            if (!fs.existsSync(joinedPath)) {
-                fs.mkdirSync(joinedPath);
-            }
-        }
-    }
-    catch (e) {
-        throw new Error(`Error building local installation folder (${path.join(baseFolder, ...pathSegments)}): ${e}`);
-    }
-    return joinedPath;
-}
-function _getRushTempFolder(rushCommonFolder) {
-    const rushTempFolder = process.env[RUSH_TEMP_FOLDER_ENV_VARIABLE_NAME];
-    if (rushTempFolder !== undefined) {
-        _ensureFolder(rushTempFolder);
-        return rushTempFolder;
-    }
-    else {
-        return _ensureAndJoinPath(rushCommonFolder, 'temp');
-    }
-}
-/**
- * Resolve a package specifier to a static version
- */
-function _resolvePackageVersion(rushCommonFolder, { name, version }) {
-    if (!version) {
-        version = '*'; // If no version is specified, use the latest version
-    }
-    if (version.match(/^[a-zA-Z0-9\-\+\.]+$/)) {
-        // If the version contains only characters that we recognize to be used in static version specifiers,
-        // pass the version through
-        return version;
-    }
-    else {
-        // version resolves to
-        try {
-            const rushTempFolder = _getRushTempFolder(rushCommonFolder);
-            const sourceNpmrcFolder = path.join(rushCommonFolder, 'config', 'rush');
-            _syncNpmrc(sourceNpmrcFolder, rushTempFolder);
-            const npmPath = getNpmPath();
-            // This returns something that looks like:
-            //  @microsoft/rush@3.0.0 '3.0.0'
-            //  @microsoft/rush@3.0.1 '3.0.1'
-            //  ...
-            //  @microsoft/rush@3.0.20 '3.0.20'
-            //  <blank line>
-            const npmVersionSpawnResult = childProcess.spawnSync(npmPath, ['view', `${name}@${version}`, 'version', '--no-update-notifier'], {
-                cwd: rushTempFolder,
-                stdio: []
-            });
-            if (npmVersionSpawnResult.status !== 0) {
-                throw new Error(`"npm view" returned error code ${npmVersionSpawnResult.status}`);
-            }
-            const npmViewVersionOutput = npmVersionSpawnResult.stdout.toString();
-            const versionLines = npmViewVersionOutput.split('\n').filter((line) => !!line);
-            const latestVersion = versionLines[versionLines.length - 1];
-            if (!latestVersion) {
-                throw new Error('No versions found for the specified version range.');
-            }
-            const versionMatches = latestVersion.match(/^.+\s\'(.+)\'$/);
-            if (!versionMatches) {
-                throw new Error(`Invalid npm output ${latestVersion}`);
-            }
-            return versionMatches[1];
-        }
-        catch (e) {
-            throw new Error(`Unable to resolve version ${version} of package ${name}: ${e}`);
-        }
-    }
-}
-let _rushJsonFolder;
-/**
- * Find the absolute path to the folder containing rush.json
- */
-function findRushJsonFolder() {
-    if (!_rushJsonFolder) {
-        let basePath = __dirname;
-        let tempPath = __dirname;
-        do {
-            const testRushJsonPath = path.join(basePath, exports.RUSH_JSON_FILENAME);
-            if (fs.existsSync(testRushJsonPath)) {
-                _rushJsonFolder = basePath;
-                break;
-            }
-            else {
-                basePath = tempPath;
-            }
-        } while (basePath !== (tempPath = path.dirname(basePath))); // Exit the loop when we hit the disk root
-        if (!_rushJsonFolder) {
-            throw new Error('Unable to find rush.json.');
-        }
-    }
-    return _rushJsonFolder;
-}
-exports.findRushJsonFolder = findRushJsonFolder;
-/**
- * Detects if the package in the specified directory is installed
- */
-function _isPackageAlreadyInstalled(packageInstallFolder) {
-    try {
-        const flagFilePath = path.join(packageInstallFolder, INSTALLED_FLAG_FILENAME);
-        if (!fs.existsSync(flagFilePath)) {
-            return false;
-        }
-        const fileContents = fs.readFileSync(flagFilePath).toString();
-        return fileContents.trim() === process.version;
-    }
-    catch (e) {
-        return false;
-    }
-}
-/**
- * Removes the following files and directories under the specified folder path:
- *  - installed.flag
- *  -
- *  - node_modules
- */
-function _cleanInstallFolder(rushTempFolder, packageInstallFolder) {
-    try {
-        const flagFile = path.resolve(packageInstallFolder, INSTALLED_FLAG_FILENAME);
-        if (fs.existsSync(flagFile)) {
-            fs.unlinkSync(flagFile);
-        }
-        const packageLockFile = path.resolve(packageInstallFolder, 'package-lock.json');
-        if (fs.existsSync(packageLockFile)) {
-            fs.unlinkSync(packageLockFile);
-        }
-        const nodeModulesFolder = path.resolve(packageInstallFolder, NODE_MODULES_FOLDER_NAME);
-        if (fs.existsSync(nodeModulesFolder)) {
-            const rushRecyclerFolder = _ensureAndJoinPath(rushTempFolder, 'rush-recycler', `install-run-${Date.now().toString()}`);
-            fs.renameSync(nodeModulesFolder, rushRecyclerFolder);
-        }
-    }
-    catch (e) {
-        throw new Error(`Error cleaning the package install folder (${packageInstallFolder}): ${e}`);
-    }
-}
-function _createPackageJson(packageInstallFolder, name, version) {
-    try {
-        const packageJsonContents = {
-            'name': 'ci-rush',
-            'version': '0.0.0',
-            'dependencies': {
-                [name]: version
-            },
-            'description': 'DON\'T WARN',
-            'repository': 'DON\'T WARN',
-            'license': 'MIT'
-        };
-        const packageJsonPath = path.join(packageInstallFolder, PACKAGE_JSON_FILENAME);
-        fs.writeFileSync(packageJsonPath, JSON.stringify(packageJsonContents, undefined, 2));
-    }
-    catch (e) {
-        throw new Error(`Unable to create package.json: ${e}`);
-    }
-}
-/**
- * Run "npm install" in the package install folder.
- */
-function _installPackage(packageInstallFolder, name, version) {
-    try {
-        console.log(`Installing ${name}...`);
-        const npmPath = getNpmPath();
-        const result = childProcess.spawnSync(npmPath, ['install'], {
-            stdio: 'inherit',
-            cwd: packageInstallFolder,
-            env: process.env
-        });
-        if (result.status !== 0) {
-            throw new Error('"npm install" encountered an error');
-        }
-        console.log(`Successfully installed ${name}@${version}`);
-    }
-    catch (e) {
-        throw new Error(`Unable to install package: ${e}`);
-    }
-}
-/**
- * Get the ".bin" path for the package.
- */
-function _getBinPath(packageInstallFolder, binName) {
-    const binFolderPath = path.resolve(packageInstallFolder, NODE_MODULES_FOLDER_NAME, '.bin');
-    const resolvedBinName = (os.platform() === 'win32') ? `${binName}.cmd` : binName;
-    return path.resolve(binFolderPath, resolvedBinName);
-}
-/**
- * Write a flag file to the package's install directory, signifying that the install was successful.
- */
-function _writeFlagFile(packageInstallFolder) {
-    try {
-        const flagFilePath = path.join(packageInstallFolder, INSTALLED_FLAG_FILENAME);
-        fs.writeFileSync(flagFilePath, process.version);
-    }
-    catch (e) {
-        throw new Error(`Unable to create installed.flag file in ${packageInstallFolder}`);
-    }
-}
-function installAndRun(packageName, packageVersion, packageBinName, packageBinArgs) {
-    const rushJsonFolder = findRushJsonFolder();
-    const rushCommonFolder = path.join(rushJsonFolder, 'common');
-    const rushTempFolder = _getRushTempFolder(rushCommonFolder);
-    const packageInstallFolder = _ensureAndJoinPath(rushTempFolder, 'install-run', `${packageName}@${packageVersion}`);
-    if (!_isPackageAlreadyInstalled(packageInstallFolder)) {
-        // The package isn't already installed
-        _cleanInstallFolder(rushTempFolder, packageInstallFolder);
-        const sourceNpmrcFolder = path.join(rushCommonFolder, 'config', 'rush');
-        _syncNpmrc(sourceNpmrcFolder, packageInstallFolder);
-        _createPackageJson(packageInstallFolder, packageName, packageVersion);
-        _installPackage(packageInstallFolder, packageName, packageVersion);
-        _writeFlagFile(packageInstallFolder);
-    }
-    const statusMessage = `Invoking "${packageBinName} ${packageBinArgs.join(' ')}"`;
-    const statusMessageLine = new Array(statusMessage.length + 1).join('-');
-    console.log(os.EOL + statusMessage + os.EOL + statusMessageLine + os.EOL);
-    const binPath = _getBinPath(packageInstallFolder, packageBinName);
-    const result = childProcess.spawnSync(binPath, packageBinArgs, {
-        stdio: 'inherit',
-        cwd: process.cwd(),
-        env: process.env
-    });
-    if (result.status !== null) {
-        return result.status;
-    }
-    else {
-        throw result.error || new Error('An unknown error occurred.');
-    }
-}
-exports.installAndRun = installAndRun;
-function runWithErrorAndStatusCode(fn) {
-    process.exitCode = 1;
-    try {
-        const exitCode = fn();
-        process.exitCode = exitCode;
-    }
-    catch (e) {
-        console.error(os.EOL + os.EOL + e.toString() + os.EOL + os.EOL);
-    }
-}
-exports.runWithErrorAndStatusCode = runWithErrorAndStatusCode;
-function _run() {
-    const [nodePath, /* Ex: /bin/node */ scriptPath, /* /repo/common/scripts/install-run-rush.js */ rawPackageSpecifier, /* qrcode@^1.2.0 */ packageBinName, /* qrcode */ ...packageBinArgs /* [-f, myproject/lib] */] = process.argv;
-    if (!nodePath) {
-        throw new Error('Unexpected exception: could not detect node path');
-    }
-    if (path.basename(scriptPath).toLowerCase() !== 'install-run.js') {
-        // If install-run.js wasn't directly invoked, don't execute the rest of this function. Return control
-        // to the script that (presumably) imported this file
-        return;
-    }
-    if (process.argv.length < 4) {
-        console.log('Usage: install-run.js <package>@<version> <command> [args...]');
-        console.log('Example: install-run.js qrcode@1.2.2 qrcode https://rushjs.io');
-        process.exit(1);
-    }
-    runWithErrorAndStatusCode(() => {
-        const rushJsonFolder = findRushJsonFolder();
-        const rushCommonFolder = _ensureAndJoinPath(rushJsonFolder, 'common');
-        const packageSpecifier = _parsePackageSpecifier(rawPackageSpecifier);
-        const name = packageSpecifier.name;
-        const version = _resolvePackageVersion(rushCommonFolder, packageSpecifier);
-        if (packageSpecifier.version !== version) {
-            console.log(`Resolved to ${name}@${version}`);
-        }
-        return installAndRun(name, version, packageBinName, packageBinArgs);
-    });
-}
-_run();
-//# sourceMappingURL=install-run.js.map

configs/typescript-config/extension.tsconfig.json

@@ -1,8 +0,0 @@
-{
-  "$schema": "http://json.schemastore.org/tsconfig",
-  "extends": "./common.tsconfig.json",
-  "compilerOptions": {
-    "declaration": false,
-    "strict": true
-  }
-}

configs/typescript-config/lib.tsconfig.json

@@ -1,4 +0,0 @@
-{
-  "$schema": "http://json.schemastore.org/tsconfig",
-  "extends": "./common.tsconfig.json"
-}

configs/typescript-config/package.json

@@ -1,18 +0,0 @@
-{
-  "name": "typescript-config",
-  "description": "TypeScript configurations",
-  "author": "GitHub",
-  "private": true,
-  "version": "0.0.1",
-  "publisher": "GitHub",
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/github/vscode-codeql"
-  },
-  "scripts": {
-    "build": "",
-    "format": ""
-  },
-  "devDependencies": {},
-  "dependencies": {}
-}

extensions/ql-vscode/.eslintrc.js

@@ -1,38 +1,37 @@
 module.exports = {
-  parser: '@typescript-eslint/parser',
+  parser: "@typescript-eslint/parser",
   parserOptions: {
     ecmaVersion: 2018,
-    sourceType: 'module',
-    ecmaFeatures: {
-      modules: true,
-    },
-    project: ['tsconfig.json', './src/**/tsconfig.json'],
+    sourceType: "module",
+    project: ["tsconfig.json", "./src/**/tsconfig.json", "./gulpfile.ts/tsconfig.json"],
   },
-  plugins: ['@typescript-eslint'],
+  plugins: ["@typescript-eslint"],
   env: {
     node: true,
-    es6: true
+    es6: true,
   },
-  extends: [
-    'eslint:recommended',
-    'plugin:@typescript-eslint/recommended',
-  ],
+  extends: ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
   rules: {
-    '@typescript-eslint/no-use-before-define': 0,
-    '@typescript-eslint/no-unused-vars': ["warn", {
-      "vars": "all",
-      "args": "none",
-      "ignoreRestSiblings": false
-    }],
+    "@typescript-eslint/no-use-before-define": 0,
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      {
+        vars: "all",
+        args: "none",
+        ignoreRestSiblings: false,
+      },
+    ],
     "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/explicit-module-boundary-types": "off",
     "@typescript-eslint/no-non-null-assertion": "off",
     "@typescript-eslint/no-explicit-any": "off",
-    "prefer-const": ["warn", {"destructuring": "all"}],
-    "indent": "off",
-    "@typescript-eslint/indent": ["error", 2, {
-      "SwitchCase": 1,
-      "FunctionDeclaration": { "body": 1, "parameters": 1 }
-    }],
-    "@typescript-eslint/no-throw-literal": "error"
+    "@typescript-eslint/no-floating-promises": [ "error", { ignoreVoid: true } ],
+    "prefer-const": ["warn", { destructuring: "all" }],
+    indent: "off",
+    "@typescript-eslint/indent": "off",
+    "@typescript-eslint/no-throw-literal": "error",
+    "no-useless-escape": 0,
+    semi: 2,
+    quotes: ["warn", "single"]
   },
 };

extensions/ql-vscode/CHANGELOG.md

@@ -1,5 +1,260 @@
 # CodeQL for Visual Studio Code: Changelog
 
+## 1.5.6 - 07 October 2021
+
+- Add progress messages to LGTM download option. This makes the two-step process (selecting a project, then selecting a language) more clear. [#960](https://github.com/github/vscode-codeql/pull/960)
+- Remove line about selecting a language from the dropdown when downloading database from LGTM. This makes the download progress visible when the popup is not expanded. [#957](https://github.com/github/vscode-codeql/pull/957)
+- Fix a bug where copying the version information fails when a CodeQL CLI cannot be found. [#958](https://github.com/github/vscode-codeql/pull/958)
+- Avoid a race condition when deleting databases that can cause occasional errors. [#959](https://github.com/github/vscode-codeql/pull/959)
+- Update CodeQL logos. [#965](https://github.com/github/vscode-codeql/pull/965)
+
+## 1.5.5 - 08 September 2021
+
+- Fix bug where a query is sometimes run before the file is saved. [#947](https://github.com/github/vscode-codeql/pull/947)
+- Fix broken contextual queries, including _View AST_. [#949](https://github.com/github/vscode-codeql/pull/949)
+
+## 1.5.4 - 02 September 2021
+
+- Add support for filename pattern in history view. [#930](https://github.com/github/vscode-codeql/pull/930)
+- Add an option _View Results (CSV)_ to view the results of a non-alert query. The existing options for alert queries have been renamed to _View Alerts_ to avoid confusion. [#929](https://github.com/github/vscode-codeql/pull/929)
+- Allow users to specify the number of paths to display for each alert. [#931](https://github.com/github/vscode-codeql/pull/931)
+- Adjust pagination controls in _CodeQL Query Results_ to always be visible [#936](https://github.com/github/vscode-codeql/pull/936)
+- Fix bug where _View AST_ fails due to recent refactoring in the standard library and query packs. [#939](https://github.com/github/vscode-codeql/pull/939)
+
+## 1.5.3 - 18 August 2021
+
+- Add a command _CodeQL: Run Query on Multiple Databases_, which lets users select multiple databases to run a query on. [#898](https://github.com/github/vscode-codeql/pull/898)
+- Autodetect what language a query targets. This refines the _CodeQL: Run Query on Multiple Databases_ command to only show relevant databases. [#915](https://github.com/github/vscode-codeql/pull/915)
+- Adjust test log output to display diffs only when comparing failed test results with expected test results. [#920](https://github.com/github/vscode-codeql/pull/920)
+
+## 1.5.2 - 13 July 2021
+
+- Add the _Add Database Source to Workspace_ command to the right-click context menu in the databases view. This lets users re-add a database's source folder to the workspace and browse the source code. [#891](https://github.com/github/vscode-codeql/pull/891)
+- Fix markdown rendering in the description of the `codeQL.cli.executablePath` setting. [#908](https://github.com/github/vscode-codeql/pull/908)
+- Fix the _Open Query Results_ command in the query history view. [#909](https://github.com/github/vscode-codeql/pull/909)
+
+## 1.5.1 - 23 June 2021
+
+No user facing changes.
+
+## 1.5.0 - 14 June 2021
+
+- Display CodeQL CLI version being downloaded during an upgrade. [#862](https://github.com/github/vscode-codeql/pull/862)
+- Display a helpful message and link to documentation when a query produces no results. [#866](https://github.com/github/vscode-codeql/pull/866)
+- Refresh test databases automatically after a test run. [#868](https://github.com/github/vscode-codeql/pull/868)
+- Allow users to specify a custom directory for storing query server logs (`codeQL.runningQueries.customLogDirectory`). The extension will not delete these logs automatically. [#863](https://github.com/github/vscode-codeql/pull/863)
+- Support the VS Code [Workspace Trust feature](https://code.visualstudio.com/docs/editor/workspace-trust). This extension is now enabled in untrusted workspaces, but it restricts commands that contain arbitrary paths. [#861](https://github.com/github/vscode-codeql/pull/861)
+- Allow the `codeQL.cli.executablePath` configuration setting to be set in workspace-scoped configuration files. This means that each workspace can now specify its own CodeQL CLI compiler, a feature that is unblocked due to implementing Workspace Trust. [#861](https://github.com/github/vscode-codeql/pull/861)
+
+## 1.4.8 - 05 May 2021
+
+- Copy version information to the clipboard when a user clicks the CodeQL section of the status bar. [#845](https://github.com/github/vscode-codeql/pull/845)
+- Ensure changes in directories that contain tests will be properly updated in the test explorer. [#846](https://github.com/github/vscode-codeql/pull/846)
+- Remind users to choose a language when downloading a database from LGTM. [#852](https://github.com/github/vscode-codeql/pull/852)
+
+## 1.4.7 - 23 April 2021
+
+- Fix a bug that prevented the results view from being loaded. [#842](https://github.com/github/vscode-codeql/pull/842)
+
+## 1.4.6 - 21 April 2021
+
+- Avoid showing an error popup when running a query with `@kind table` metadata. [#814](https://github.com/github/vscode-codeql/pull/814)
+- Add an option to jump from a .qlref file to the .ql file it references. [#815](https://github.com/github/vscode-codeql/pull/815)
+- Avoid opening the results panel when a database is deleted. [#831](https://github.com/github/vscode-codeql/pull/831)
+- Forward all query metadata to the CLI when interpreting results. [#838](https://github.com/github/vscode-codeql/pull/838)
+
+## 1.4.5 - 22 March 2021
+
+- Avoid showing an error popup when user runs a query without `@kind` metadata. [#801](https://github.com/github/vscode-codeql/pull/801)
+- Fix running of tests when the `ms-python` extension is installed. [#803](https://github.com/github/vscode-codeql/pull/803)
+
+## 1.4.4 - 19 March 2021
+
+- Introduce evaluator options for saving intermediate results to the disk cache (`codeQL.runningQueries.saveCache`) and for limiting the size of this cache (`codeQL.runningQueries.cacheSize`). [#778](https://github.com/github/vscode-codeql/pull/778)
+- Respect the `codeQL.runningQueries.numberOfThreads` setting when creating SARIF files during result interpretation. [#771](https://github.com/github/vscode-codeql/pull/771)
+- Allow using raw LGTM project slugs for fetching LGTM databases. [#769](https://github.com/github/vscode-codeql/pull/769)
+- Better error messages when BQRS interpretation fails to produce SARIF. [#770](https://github.com/github/vscode-codeql/pull/770)
+- Implement sorting of the query history view by name, date, and results count. [#777](https://github.com/github/vscode-codeql/pull/777)
+- Add a configuration option to pass additional arguments to the CLI when running tests. [#785](https://github.com/github/vscode-codeql/pull/785)
+- Introduce option to view query results as CSV. [#784](https://github.com/github/vscode-codeql/pull/784)
+- Add some snippets for commonly used QL statements. [#782](https://github.com/github/vscode-codeql/pull/782)
+- More descriptive error messages on QL test failures. [#788](https://github.com/github/vscode-codeql/pull/788)
+
+## 1.4.3 - 22 February 2021
+
+- Avoid displaying an error when removing orphaned databases and the storage folder does not exist. [#748](https://github.com/github/vscode-codeql/pull/748)
+- Add better error messages when AST Viewer is unable to create an AST. [#753](https://github.com/github/vscode-codeql/pull/753)
+- Cache AST viewing operations so that subsequent calls to view the AST of a single file will be extremely fast. [#753](https://github.com/github/vscode-codeql/pull/753)
+- Ensure CodeQL version in status bar updates correctly when version changes. [#754](https://github.com/github/vscode-codeql/pull/754)
+- Avoid deleting the quick query file when it is re-opened. [#747](https://github.com/github/vscode-codeql/pull/747)
+
+## 1.4.2 - 2 February 2021
+
+- Add a status bar item for the CodeQL CLI to show the current version. [#741](https://github.com/github/vscode-codeql/pull/741)
+- Fix version constraint for flagging CLI support of non-destructive updates. [#744](https://github.com/github/vscode-codeql/pull/744)
+- Add a _More Information_ button in the telemetry popup that opens the [telemetry documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/about-telemetry-in-codeql-for-visual-studio-code) in a browser tab. [#742](https://github.com/github/vscode-codeql/pull/742)
+
+## 1.4.1 - 29 January 2021
+
+- Reword the telemetry modal dialog box. [#738](https://github.com/github/vscode-codeql/pull/738)
+
+## 1.4.0 - 29 January 2021
+
+- Fix bug where databases are not reregistered when the query server restarts. [#734](https://github.com/github/vscode-codeql/pull/734)
+- Fix bug where upgrade requests were erroneously being marked as failed. [#734](https://github.com/github/vscode-codeql/pull/734)
+- On a strictly opt-in basis, collect anonymized usage data from the VS Code extension, helping improve CodeQL's usability and performance. See the [telemetry documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/about-telemetry-in-codeql-for-visual-studio-code) for more information on exactly what data is collected and what it is used for. [#611](https://github.com/github/vscode-codeql/pull/611)
+
+## 1.3.10 - 20 January 2021
+
+- Include the full stack in error log messages to help with debugging. [#726](https://github.com/github/vscode-codeql/pull/726)
+
+## 1.3.9 - 12 January 2021
+
+- No changes visible to end users.
+
+## 1.3.8 - 17 December 2020
+
+- Ensure databases are unlocked when removing them from the workspace. This will ensure that after a database is removed from VS Code, queries can be run on it from the command line without restarting the IDE. Requires CodeQL CLI 2.4.1 or later. [#681](https://github.com/github/vscode-codeql/pull/681)
+- Fix bug when removing databases where sometimes the source folder would not also be removed from the workspace or the database files would not be deleted from the workspace storage location. [#692](https://github.com/github/vscode-codeql/pull/692)
+- Query results with no string representation will now be displayed with placeholder text in query results. Previously, they were omitted. [#694](https://github.com/github/vscode-codeql/pull/694)
+- Add a label for the language of a database in the databases view. This will only take effect for new databases created with the CodeQL CLI v2.4.1 or later. [#697](https://github.com/github/vscode-codeql/pull/697)
+- Add clearer error message when running a query using a missing or invalid qlpack. [#702](https://github.com/github/vscode-codeql/pull/702)
+- Add clearer error message when trying to run a command from the query history view if no item in the history is selected. [#702](https://github.com/github/vscode-codeql/pull/702)
+- Fix a bug where it is not possible to download some database archives. This fix specifically addresses large archives and archives whose central directories do not align with file headers. [#700](https://github.com/github/vscode-codeql/pull/700)
+- Avoid error dialogs when QL test discovery or database cleanup encounters a missing directory. [#706](https://github.com/github/vscode-codeql/pull/706)
+- Add descriptive text and a link in the results view. [#711](https://github.com/github/vscode-codeql/pull/711)
+- Fix the _Set Label_ command in the query history view. [#710](https://github.com/github/vscode-codeql/pull/710)
+- Add the _CodeQL: View AST_ command to the right-click context menu when a source file in a database source archive is open in the editor. [#712](https://github.com/github/vscode-codeql/pull/712)
+
+## 1.3.7 - 24 November 2020
+
+- Editors opened by navigating from the results view are no longer opened in _preview mode_. Now they are opened as a persistent editor. [#630](https://github.com/github/vscode-codeql/pull/630)
+- When comparing the results of a failed QL test run and the `.expected` file does not exist, an empty `.expected` file is created and compared against the `.actual` file. [#669](https://github.com/github/vscode-codeql/pull/669)
+- Alter structure of the _Test Explorer_ tree. It now follows the structure of the filesystem instead of the QL Packs. [#624](https://github.com/github/vscode-codeql/pull/624)
+- Alter structure of the _Test Explorer_ tree. It now follows the structure of the filesystem instead of the QL Packs. [#624](https://github.com/github/vscode-codeql/pull/624)
+- Add more structured output for tests. [#626](https://github.com/github/vscode-codeql/pull/626)
+- Whenever the extension restarts, orphaned databases will be cleaned up. These are databases whose files are located inside of the extension's storage area, but are not imported into the workspace.
+- After renaming a database, the database list is re-sorted. [#685](https://github.com/github/vscode-codeql/pull/685)
+- Add a `codeQl.resultsDisplay.pageSize` setting to configure the number of results displayed in a single results view page. Increase the default page size from 100 to 200. [#686](https://github.com/github/vscode-codeql/pull/686)
+- Update the AST Viewer to include edge labels (if available) in addition to the target node labels. So far, only C/C++ databases take advantage of this change. [#688](https://github.com/github/vscode-codeql/pull/688)
+
+## 1.3.6 - 4 November 2020
+
+- Fix URI encoding for databases that were created with special characters in their paths. [#648](https://github.com/github/vscode-codeql/pull/648)
+- Disable CodeQL Test commands from the command palette [#667](https://github.com/github/vscode-codeql/pull/667)
+- Fix display of booleans in results view. [#657](https://github.com/github/vscode-codeql/pull/657)
+- Avoid recursive selection changes in AST Viewer. [#668](https://github.com/github/vscode-codeql/pull/668)
+
+## 1.3.5 - 27 October 2020
+
+- Fix a bug where archived source folders for databases were not showing any contents.
+- Fix URI encoding for databases that were created with special characters in their paths.
+
+## 1.3.4 - 22 October 2020
+
+- Add friendly welcome message when the databases view is empty.
+- Add open query, open results, and remove query commands in the query history view title bar.
+- The maximum number of simultaneous queries launchable by the `CodeQL: Run Queries in Selected Files` command is now configurable by changing the `codeQL.runningQueries.maxQueries` setting.
+- Allow simultaneously run queries to be canceled in a single-click.
+- Prevent multiple upgrade dialogs from appearing when running simultaneous queries on upgradeable databases.
+- Fix sorting of results. Some pages of results would have the wrong sort order and columns.
+- Remember previous sort order when reloading query results.
+- Fix proper escaping of backslashes in SARIF message strings.
+- Allow setting `codeQL.runningQueries.numberOfThreads` and `codeQL.runningTests.numberOfThreads` to 0, (which is interpreted as 'use one thread per core on the machine').
+- Clear the problems view of all CodeQL query results when a database is removed.
+- Add a `View DIL` command on query history items. This opens a text editor containing the Datalog Intermediary Language representation of the compiled query.
+- Remove feature flag for the AST Viewer. For more information on how to use the AST Viewer, [see the documentation](https://help.semmle.com/codeql/codeql-for-vscode/procedures/exploring-the-structure-of-your-source-code.html).
+- The `codeQL.runningTests.numberOfThreads` setting is now used correctly when running tests.
+- Alter structure of the _Test Explorer_ tree. It now follows the structure of the filesystem instead of the qlpacks.
+- Ensure output of CodeQL test runs includes compilation error messages and test failure messages.
+
+## 1.3.3 - 16 September 2020
+
+- Fix display of raw results entities with label but no url.
+- Fix bug where sort order is forgotten when changing raw results page.
+- Avoid showing a location link in results view when a result item has an empty location.
+
+## 1.3.2 - 12 August 2020
+
+- Fix error with choosing qlpack search path.
+- Fix pagination when there are no results.
+- Suppress database downloaded from URL message when action canceled.
+- Fix QL test discovery to avoid showing duplicate tests in the test explorer.
+- Enable pagination of query results
+- Add experimental AST Viewer for Go and C++. To enable, add `"codeQL.experimentalAstViewer": true` to the user settings file.
+
+## 1.3.1 - 7 July 2020
+
+- Fix unzipping of large files.
+- Ensure compare order is consistent when selecting two queries to compare. The first query selected is always the _from_ query and the query selected later is always the _to_ query.
+- Ensure added databases have zipped source locations for databases added as archives or downloaded from the internet.
+- Fix bug where it is not possible to add databases starting with `db-*`.
+- Change styling of pagination section of the results page.
+- Fix display of query text for stored quick queries.
+
+## 1.3.0 - 22 June 2020
+
+- Report error when selecting invalid database.
+- Add descriptive message for database archive import failure.
+- Respect VS Code's i18n locale setting when formatting dates and sorting strings.
+- Allow the opening of large SARIF files externally from VS Code.
+- Add new 'CodeQL: Compare Query' command that shows the differences between two queries.
+- Allow multiple items in the query history view to be removed in one operation.
+- Allow multiple items in the databases view to be removed in one operation.
+- Allow multiple items in the databases view to be upgraded in one operation.
+- Allow multiple items in the databases view to have their external folders opened.
+- Allow all selected queries to be run in one command from the file explorer.
+
+## 1.2.2 - 8 June 2020
+
+- Fix auto-indentation rules.
+- Add ability to download platform-specific releases of the CodeQL CLI if they are available.
+- Fix handling of downloading prerelease versions of the CodeQL CLI.
+- Add pagination for displaying non-interpreted results.
+
+## 1.2.1 - 29 May 2020
+
+- Better formatting and autoindentation when adding QLDoc comments to `.ql` and `.qll` files.
+- Allow for more flexibility when opening a database in the workspace. A user can now choose the actual database folder, or the nested `db-*` folder.
+- Add query history menu command for viewing corresponding SARIF file.
+- Add ability for users to download databases directly from LGTM.com.
+
+## 1.2.0 - 19 May 2020
+
+- Enable 'Go to Definition' and 'Go to References' on source archive
+  files in CodeQL databases. This is handled by a CodeQL query.
+- Fix adding database archive files on Windows.
+- Enable adding remote and local database archive files from the
+  command palette.
+
+## 1.1.5 - 15 May 2020
+
+- Links in results are no longer underlined and monospaced.
+- Add the ability to choose a database either from an archive, a folder, or from the internet.
+- New icons for commands on the databases view.
+
+## 1.1.4 - 13 May 2020
+
+- Add the ability to download and install databases archives from the internet.
+
+## 1.1.3 - 8 May 2020
+
+- Add a suggestion in alerts view to view raw results, when there are
+  raw results but no alerts.
+- Add the ability to rename databases in the database view.
+- Add the ability to open the directory in the filesystem
+  of a database.
+
+## 1.1.2 - 28 April 2020
+
+- Implement syntax highlighting for the new `unique` aggregate.
+- Implement XML syntax highlighting for `.qhelp` files.
+- Add option to auto save queries before running them.
+- Add new command in query history to view the query text of the
+  selected query (note that this may be different from the current
+  contents of the query file if the file has been edited).
+- Add ability to sort CodeQL databases by name or by date added.
+
 ## 1.1.1 - 23 March 2020
 
 - Fix quick evaluation in `.qll` files.
@@ -39,7 +294,7 @@
 ## 1.0.3 - 13 January 2020
 
 - Reduce the frequency of CodeQL CLI update checks to help avoid hitting GitHub API limits of 60 requests per
-hour for unauthenticated IPs.
+  hour for unauthenticated IPs.
 - Fix sorting of result sets with names containing special characters.
 
 ## 1.0.2 - 13 December 2019
@@ -48,8 +303,7 @@ hour for unauthenticated IPs.
 - Allow customization of query history labels from settings and from
   query history view context menu.
 - Show number of results in results view.
-- Add commands `CodeQL: Show Next Step on Path` and `CodeQL: Show
-  Previous Step on Path` for navigating the steps on the currently
+- Add commands `CodeQL: Show Next Step on Path` and `CodeQL: Show Previous Step on Path` for navigating the steps on the currently
   shown path result.
 
 ## 1.0.1 - 21 November 2019

extensions/ql-vscode/README.md

@@ -1,31 +1,31 @@
 # CodeQL extension for Visual Studio Code
 
-This project is an extension for Visual Studio Code that adds rich language support for [CodeQL](https://help.semmle.com/codeql) and allows you to easily find problems in codebases. In particular, the extension:
+This project is an extension for Visual Studio Code that adds rich language support for [CodeQL](https://codeql.github.com/docs/) and allows you to easily find problems in codebases. In particular, the extension:
 
-* Enables you to use CodeQL to query databases generated from source code.
-* Shows the flow of data through the results of path queries, which is essential for triaging security results.
-* Provides an easy way to run queries from the large, open source repository of [CodeQL security queries](https://github.com/Semmle/ql).
-* Adds IntelliSense to support you writing and editing your own CodeQL query and library files.
+- Enables you to use CodeQL to query databases generated from source code.
+- Shows the flow of data through the results of path queries, which is essential for triaging security results.
+- Provides an easy way to run queries from the large, open source repository of [CodeQL security queries](https://github.com/github/codeql).
+- Adds IntelliSense to support you writing and editing your own CodeQL query and library files.
 
-To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/master/extensions/ql-vscode/CHANGELOG.md).
+To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/main/extensions/ql-vscode/CHANGELOG.md).
 
 ## Quick start overview
 
 The information in this `README` file describes the quickest way to start using CodeQL.
-For information about other configurations, see the separate [CodeQL help](https://help.semmle.com/codeql/codeql-for-vscode.html).
+For information about other configurations, see the separate [CodeQL help](https://codeql.github.com/docs/codeql-for-visual-studio-code/).
 
-**Quick start: Installing and configuring the extension**
+### Quick start: Installing and configuring the extension
 
 1. [Install the extension](#installing-the-extension).
 1. [Check access to the CodeQL CLI](#checking-access-to-the-codeql-cli).
 1. [Clone the CodeQL starter workspace](#cloning-the-codeql-starter-workspace).
 
-**Quick start: Using CodeQL**
+### Quick start: Using CodeQL
 
 1. [Import a database from LGTM](#importing-a-database-from-lgtm).
 1. [Run a query](#running-a-query).
 
------
+---
 
 ## Quick start: Installing and configuring the extension
 
@@ -40,19 +40,34 @@ The CodeQL extension requires a minimum of Visual Studio Code 1.39. Older versio
 
 ### Checking access to the CodeQL CLI
 
-The extension uses the [CodeQL CLI](https://help.semmle.com/codeql/codeql-cli.html) to compile and run queries. The extension automatically manages access to the CLI for you by default (recommended). To check for updates to the CodeQL CLI, you can use the **CodeQL: Check for CLI Updates** command.
+The extension uses the [CodeQL CLI](https://codeql.github.com/docs/codeql-cli/) to compile and run queries. The extension automatically manages access to the CLI for you by default (recommended). To check for updates to the CodeQL CLI, you can use the **CodeQL: Check for CLI Updates** command.
 
-If you want to override the default behavior and use a CodeQL CLI that's already on your machine, see [Configuring access to the CodeQL CLI](https://help.semmle.com/codeql/codeql-for-vscode/procedures/setting-up.html#configuring-access-to-the-codeql-cli).
+If you want to override the default behavior and use a CodeQL CLI that's already on your machine, see [Configuring access to the CodeQL CLI](https://codeql.github.com/docs/codeql-for-visual-studio-code/setting-up-codeql-in-visual-studio-code/#configuring-access-to-the-codeql-cli).
 
 If you have any difficulty with CodeQL CLI access, see the **CodeQL Extension Log** in the **Output** view for any error messages.
 
 ### Cloning the CodeQL starter workspace
 
 When you're working with CodeQL, you need access to the standard CodeQL libraries and queries.
-Initially, we recommend that you clone and use the ready-to-use starter workspace, https://github.com/github/vscode-codeql-starter/.
+Initially, we recommend that you clone and use the ready-to-use [starter workspace](https://github.com/github/vscode-codeql-starter/).
 This includes libraries and queries for the main supported languages, with folders set up ready for your custom queries. After cloning the workspace (use `git clone --recursive`), you can use it in the same way as any other VS Code workspace—with the added advantage that you can easily update the CodeQL libraries.
 
-For information about configuring an existing workspace for CodeQL, [see the documentation](https://help.semmle.com/codeql/codeql-for-vscode/procedures/setting-up.html#updating-an-existing-workspace-for-codeql).
+For information about configuring an existing workspace for CodeQL, [see the documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/setting-up-codeql-in-visual-studio-code/#updating-an-existing-workspace-for-codeql).
+
+## Upgrading CodeQL standard libraries
+
+You can easily keep up-to-date with the latest changes to the [CodeQL standard libraries](https://github.com/github/codeql).
+
+If you're using the [CodeQL starter workspace](https://github.com/github/vscode-codeql-starter/), you can pull in the latest standard libraries by running:
+
+```shell
+git pull
+git submodule update --recursive
+```
+
+in the starter workspace directory.
+
+If you're using your own clone of the CodeQL standard libraries, you can do a `git pull` from where you have the libraries checked out.
 
 ## Quick start: Using CodeQL
 
@@ -60,18 +75,15 @@ You can find all the commands contributed by the extension in the Command Palett
 
 ### Importing a database from LGTM
 
-While you can use the [CodeQL CLI to create your own databases](https://help.semmle.com/codeql/codeql-cli/procedures/create-codeql-database.html), the simplest way to start is by downloading a database from LGTM.com.
+While you can use the [CodeQL CLI to create your own databases](https://codeql.github.com/docs/codeql-cli/creating-codeql-databases/), the simplest way to start is by downloading a database from LGTM.com.
 
-1. Log in to LGTM.com.
-1. Find a project you're interested in and display the **Integrations** tab (for example, [Apache Kafka](https://lgtm.com/projects/g/apache/kafka/ci/)).
-1. Scroll to the **CodeQL databases for local analysis** section at the bottom of the page.
-1. Download databases for the languages that you want to explore.
-1. Unzip the databases.
-1. For each database that you want to import:
-    1. In the VS Code sidebar, go to **CodeQL** > **Databases** and click **+**.
-    1. Browse to the unzipped database folder (the parent folder that contains `db-<language>` and `src`) and select **Choose database** to add it.
-
-When the import is complete, each CodeQL database is displayed in the CodeQL sidebar under **Databases**.
+1. Open [LGTM.com](https://lgtm.com/#explore) in your browser.
+1. Search for a project you're interested in, for example [Apache Kafka](https://lgtm.com/projects/g/apache/kafka).
+1. Copy the link to that project, for example `https://lgtm.com/projects/g/apache/kafka`.
+1. In VS Code, open the Command Palette and choose the **CodeQL: Download Database from LGTM** command.
+1. Paste the link you copied earlier.
+1. Select the language for the database you want to download (only required if the project has databases for multiple languages).
+1. Once the CodeQL database has been imported, it is displayed in the Databases view.
 
 ### Running a query
 
@@ -79,7 +91,7 @@ The instructions below assume that you're using the CodeQL starter workspace, or
 
 1. Expand the `ql` folder and locate a query to run. The standard queries are grouped by target language and then type, for example: `ql/java/ql/src/Likely Bugs`.
 1. Open a query (`.ql`) file.
-3. Right-click in the query window and select **CodeQL: Run Query**. Alternatively, open the Command Palette (**Ctrl+Shift+P** or **Cmd+Shift+P**), type `Run Query`, then select **CodeQL: Run Query**.
+1. Right-click in the query window and select **CodeQL: Run Query**. Alternatively, open the Command Palette (**Ctrl+Shift+P** or **Cmd+Shift+P**), type `Run Query`, then select **CodeQL: Run Query**.
 
 The CodeQL extension runs the query on the current database using the CLI and reports progress in the bottom right corner of the application.
 When the results are ready, they're displayed in the CodeQL Query Results view. Use the dropdown menu to choose between different forms of result output.
@@ -88,13 +100,17 @@ If there are any problems running a query, a notification is displayed in the bo
 
 ## What next?
 
-For more information about the CodeQL extension, [see the documentation](https://help.semmle.com/codeql/codeql-for-vscode.html). Otherwise, you could:
+For more information about the CodeQL extension, [see the documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/). Otherwise, you could:
 
-* [Create a database for a different codebase](https://help.semmle.com/codeql/codeql-cli/procedures/create-codeql-database.html).
-* [Try out variant analysis](https://help.semmle.com/QL/learn-ql/ql-training.html).
-* [Learn more about CodeQL](https://help.semmle.com/QL/learn-ql/).
-* [Read how security researchers use CodeQL to find CVEs](https://securitylab.github.com/research).
+- [Create a database for a different codebase](https://codeql.github.com/docs/codeql-cli/creating-codeql-databases/).
+- [Try out variant analysis](https://help.semmle.com/QL/learn-ql/ql-training.html).
+- [Learn more about CodeQL](https://codeql.github.com/docs/).
+- [Read how security researchers use CodeQL to find CVEs](https://securitylab.github.com/research).
 
 ## License
 
 The CodeQL extension for Visual Studio Code is [licensed](LICENSE.md) under the MIT License. The version of CodeQL used by the CodeQL extension is subject to the [GitHub CodeQL Terms & Conditions](https://securitylab.github.com/tools/codeql/license).
+
+## Data and Telemetry
+
+If you specifically opt-in to permit GitHub to do so, GitHub will collect usage data and metrics for the purposes of helping the core developers to improve the CodeQL extension for VS Code. This data will not be shared with any parties outside of GitHub. IP addresses and installation IDs will be retained for a maximum of 30 days. Anonymous data will be retained for a maximum of 180 days. For more information about telemetry, [see the documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/about-telemetry-in-codeql-for-visual-studio-code).

extensions/ql-vscode/gulpfile.js/index.js

@@ -1,19 +0,0 @@
-'use strict';
-
-require('ts-node').register({});
-const gulp = require('gulp');
-const {
-  compileTypeScript,
-  watchTypeScript,
-  packageExtension,
-  compileTextMateGrammar,
-  copyTestData,
-  copyViewCss
-} = require('build-tasks');
-const { compileView } = require('./webpack');
-
-exports.buildWithoutPackage = gulp.parallel(compileTypeScript, compileTextMateGrammar, compileView, copyTestData, copyViewCss);
-exports.compileTextMateGrammar = compileTextMateGrammar;
-exports.default = gulp.series(exports.buildWithoutPackage, packageExtension);
-exports.watchTypeScript = watchTypeScript;
-exports.compileTypeScript = compileTypeScript;

extensions/ql-vscode/gulpfile.js/webpack.ts

@@ -1,28 +0,0 @@
-import * as webpack from 'webpack';
-import { config } from './webpack.config';
-
-export function compileView(cb: (err?: Error) => void) {
-  webpack(config).run((error, stats) => {
-    if (error) {
-      cb(error);
-    }
-    console.log(stats.toString({
-      errorDetails: true,
-      colors: true,
-      assets: false,
-      builtAt: false,
-      version: false,
-      hash: false,
-      entrypoints: false,
-      timings: false,
-      modules: false,
-      errors: true
-    }));
-    if (stats.hasErrors()) {
-      cb(new Error('Compilation errors detected.'));
-      return;
-    }
-
-    cb();
-  });
-}

extensions/ql-vscode/gulpfile.ts/appInsights.ts

@@ -0,0 +1,16 @@
+import * as gulp from 'gulp';
+import * as replace from 'gulp-replace';
+
+/** Inject the application insights key into the telemetry file */
+export function injectAppInsightsKey() {
+  if (!process.env.APP_INSIGHTS_KEY) {
+    // noop
+    console.log('APP_INSIGHTS_KEY environment variable is not set. So, cannot inject it into the application.');
+    return Promise.resolve();
+  }
+
+  // replace the key
+  return gulp.src(['out/telemetry.js'])
+    .pipe(replace(/REPLACE-APP-INSIGHTS-KEY/, process.env.APP_INSIGHTS_KEY))
+    .pipe(gulp.dest('out/'));
+}

extensions/ql-vscode/gulpfile.ts/deploy.ts

@@ -0,0 +1,73 @@
+import * as fs from 'fs-extra';
+import * as jsonc from 'jsonc-parser';
+import * as path from 'path';
+
+export interface DeployedPackage {
+  distPath: string;
+  name: string;
+  version: string;
+}
+
+const packageFiles = [
+  '.vscodeignore',
+  'CHANGELOG.md',
+  'README.md',
+  'language-configuration.json',
+  'snippets.json',
+  'media',
+  'node_modules',
+  'out'
+];
+
+async function copyPackage(sourcePath: string, destPath: string): Promise<void> {
+  for (const file of packageFiles) {
+    console.log(`copying ${path.resolve(sourcePath, file)} to ${path.resolve(destPath, file)}`);
+    await fs.copy(path.resolve(sourcePath, file), path.resolve(destPath, file));
+  }
+}
+
+export async function deployPackage(packageJsonPath: string): Promise<DeployedPackage> {
+  try {
+    const packageJson: any = jsonc.parse(await fs.readFile(packageJsonPath, 'utf8'));
+
+    // Default to development build; use flag --release to indicate release build.
+    const isDevBuild = !process.argv.includes('--release');
+    const distDir = path.join(__dirname, '../../../dist');
+    await fs.mkdirs(distDir);
+
+    if (isDevBuild) {
+      // NOTE: rootPackage.name had better not have any regex metacharacters
+      const oldDevBuildPattern = new RegExp('^' + packageJson.name + '[^/]+-dev[0-9.]+\\.vsix$');
+      // Dev package filenames are of the form
+      //    vscode-codeql-0.0.1-dev.2019.9.27.19.55.20.vsix
+      (await fs.readdir(distDir)).filter(name => name.match(oldDevBuildPattern)).map(build => {
+        console.log(`Deleting old dev build ${build}...`);
+        fs.unlinkSync(path.join(distDir, build));
+      });
+      const now = new Date();
+      packageJson.version = packageJson.version +
+        `-dev.${now.getUTCFullYear()}.${now.getUTCMonth() + 1}.${now.getUTCDate()}` +
+        `.${now.getUTCHours()}.${now.getUTCMinutes()}.${now.getUTCSeconds()}`;
+    }
+
+    const distPath = path.join(distDir, packageJson.name);
+    await fs.remove(distPath);
+    await fs.mkdirs(distPath);
+
+    await fs.writeFile(path.join(distPath, 'package.json'), JSON.stringify(packageJson, null, 2));
+
+    const sourcePath = path.join(__dirname, '..');
+    console.log(`Copying package '${packageJson.name}' and its dependencies to '${distPath}'...`);
+    await copyPackage(sourcePath, distPath);
+
+    return {
+      distPath: distPath,
+      name: packageJson.name,
+      version: packageJson.version
+    };
+  }
+  catch (e) {
+    console.error(e);
+    throw e;
+  }
+}

extensions/ql-vscode/gulpfile.ts/index.ts

@@ -0,0 +1,15 @@
+import * as gulp from 'gulp';
+import { compileTypeScript, watchTypeScript, copyViewCss } from './typescript';
+import { compileTextMateGrammar } from './textmate';
+import { copyTestData } from './tests';
+import { compileView } from './webpack';
+import { packageExtension } from './package';
+import { injectAppInsightsKey } from './appInsights';
+
+export const buildWithoutPackage =
+  gulp.parallel(
+    compileTypeScript, compileTextMateGrammar, compileView, copyTestData, copyViewCss
+  );
+
+export { compileTextMateGrammar, watchTypeScript, compileTypeScript, copyTestData, injectAppInsightsKey };
+export default gulp.series(buildWithoutPackage, injectAppInsightsKey, packageExtension);

extensions/ql-vscode/gulpfile.ts/package.ts

@@ -1,6 +1,6 @@
 import * as path from 'path';
 import { deployPackage } from './deploy';
-import * as child_process from 'child-process-promise';
+import * as childProcess from 'child-process-promise';
 
 export async function packageExtension(): Promise<void> {
   const deployedPackage = await deployPackage(path.resolve('package.json'));
@@ -9,7 +9,7 @@ export async function packageExtension(): Promise<void> {
     'package',
     '--out', path.resolve(deployedPackage.distPath, '..', `${deployedPackage.name}-${deployedPackage.version}.vsix`)
   ];
-  const proc = child_process.spawn('vsce', args, {
+  const proc = childProcess.spawn('./node_modules/.bin/vsce', args, {
     cwd: deployedPackage.distPath
   });
   proc.childProcess.stdout!.on('data', (data) => {

extensions/ql-vscode/gulpfile.ts/tests.ts

@@ -0,0 +1,17 @@
+import * as gulp from 'gulp';
+
+export function copyTestData() {
+  copyNoWorkspaceData();
+  copyCliIntegrationData();
+  return Promise.resolve();
+}
+
+function copyNoWorkspaceData() {
+  return gulp.src('src/vscode-tests/no-workspace/data/**/*')
+    .pipe(gulp.dest('out/vscode-tests/no-workspace/data'));
+}
+
+function copyCliIntegrationData() {
+  return gulp.src('src/vscode-tests/cli-integration/data/**/*')
+    .pipe(gulp.dest('out/vscode-tests/cli-integration/data'));
+}

extensions/ql-vscode/gulpfile.ts/textmate.ts

@@ -1,5 +1,5 @@
 import * as gulp from 'gulp';
-import * as js_yaml from 'js-yaml';
+import * as jsYaml from 'js-yaml';
 import * as through from 'through2';
 import * as PluginError from 'plugin-error';
 import * as Vinyl from 'vinyl';
@@ -13,9 +13,10 @@ import * as Vinyl from 'vinyl';
  */
 function replaceReferencesWithStrings(value: string, replacements: Map<string, string>): string {
   let result = value;
+  // eslint-disable-next-line no-constant-condition
   while (true) {
     const original = result;
-    for (const key of replacements.keys()) {
+    for (const key of Array.from(replacements.keys())) {
       result = result.replace(`(?#${key})`, `(?:${replacements.get(key)})`);
     }
     if (result === original) {
@@ -32,7 +33,7 @@ function replaceReferencesWithStrings(value: string, replacements: Map<string, s
  */
 function gatherMacros(yaml: any): Map<string, string> {
   const macros = new Map<string, string>();
-  for (var key in yaml.macros) {
+  for (const key in yaml.macros) {
     macros.set(key, yaml.macros[key]);
   }
 
@@ -55,7 +56,7 @@ function getNodeMatchText(rule: any): string {
   else if (rule.patterns !== undefined) {
     const patterns: string[] = [];
     // For a list of patterns, use the disjunction of those patterns.
-    for (var patternIndex in rule.patterns) {
+    for (const patternIndex in rule.patterns) {
       const pattern = rule.patterns[patternIndex];
       if (pattern.include !== null) {
         patterns.push('(?' + pattern.include + ')');
@@ -65,7 +66,7 @@ function getNodeMatchText(rule: any): string {
     return '(?:' + patterns.join('|') + ')';
   }
   else {
-    return ''
+    return '';
   }
 }
 
@@ -78,7 +79,7 @@ function getNodeMatchText(rule: any): string {
  */
 function gatherMatchTextForRules(yaml: any): Map<string, string> {
   const replacements = new Map<string, string>();
-  for (var key in yaml.repository) {
+  for (const key in yaml.repository) {
     const node = yaml.repository[key];
     replacements.set(key, getNodeMatchText(node));
   }
@@ -106,7 +107,7 @@ function visitAllRulesInFile(yaml: any, action: (rule: any) => void) {
  * @param action Callback to invoke on each rule.
  */
 function visitAllRulesInRuleMap(ruleMap: any, action: (rule: any) => void) {
-  for (var key in ruleMap) {
+  for (const key in ruleMap) {
     const rule = ruleMap[key];
     if ((typeof rule) === 'object') {
       action(rule);
@@ -124,7 +125,7 @@ function visitAllRulesInRuleMap(ruleMap: any, action: (rule: any) => void) {
  * @param action The transformation to make on each match pattern.
  */
 function visitAllMatchesInRule(rule: any, action: (match: any) => any) {
-  for (var key in rule) {
+  for (const key in rule) {
     switch (key) {
       case 'begin':
       case 'end':
@@ -184,10 +185,10 @@ function transformFile(yaml: any) {
   visitAllRulesInFile(yaml, (rule) => {
     visitAllMatchesInRule(rule, (match) => {
       if ((typeof match) === 'object') {
-        for (var key in match) {
+        for (const key in match) {
           return macros.get(key)!.replace('(?#)', `(?:${match[key]})`);
         }
-        throw new Error("No key in macro map.")
+        throw new Error('No key in macro map.');
       }
       else {
         return match;
@@ -225,7 +226,7 @@ export function transpileTextMateGrammar() {
     else if (file.isBuffer()) {
       const buf: Buffer = file.contents;
       const yamlText: string = buf.toString('utf8');
-      const jsonData: any = js_yaml.safeLoad(yamlText);
+      const jsonData: any = jsYaml.safeLoad(yamlText);
       transformFile(jsonData);
 
       file.contents = Buffer.from(JSON.stringify(jsonData, null, 2), 'utf8');

extensions/ql-vscode/gulpfile.ts/tsconfig.json

@@ -1,15 +1,14 @@
 {
+  "$schema": "https://json.schemastore.org/tsconfig",
   "compilerOptions": {
     "declaration": true,
+    "strict": true,
     "module": "commonjs",
     "target": "es2017",
-    "outDir": "out",
-    "lib": [
-      "es6"
-    ],
+    "lib": ["es6"],
     "moduleResolution": "node",
     "sourceMap": true,
-    "rootDir": "../../src",
+    "rootDir": ".",
     "strictNullChecks": true,
     "noFallthroughCasesInSwitch": true,
     "preserveWatchOutput": true,
@@ -19,12 +18,5 @@
     "noUnusedLocals": true,
     "noUnusedParameters": true
   },
-  "include": [
-    "../../src/**/*.ts"
-  ],
-  "exclude": [
-    "../../node_modules",
-    "../../test",
-    "../../**/view"
-  ]
-}
+  "include": ["*.ts"]
+}

extensions/ql-vscode/gulpfile.ts/typescript.ts

@@ -0,0 +1,42 @@
+import * as colors from 'ansi-colors';
+import * as gulp from 'gulp';
+import * as sourcemaps from 'gulp-sourcemaps';
+import * as ts from 'gulp-typescript';
+
+function goodReporter(): ts.reporter.Reporter {
+  return {
+    error: (error, typescript) => {
+      if (error.tsFile) {
+        console.log('[' + colors.gray('gulp-typescript') + '] ' + colors.red(error.fullFilename
+          + '(' + (error.startPosition!.line + 1) + ',' + error.startPosition!.character + '): ')
+          + 'error TS' + error.diagnostic.code + ': ' + typescript.flattenDiagnosticMessageText(error.diagnostic.messageText, '\n'));
+      }
+      else {
+        console.log(error.message);
+      }
+    },
+  };
+}
+
+const tsProject = ts.createProject('tsconfig.json');
+
+export function compileTypeScript() {
+  return tsProject.src()
+    .pipe(sourcemaps.init())
+    .pipe(tsProject(goodReporter()))
+    .pipe(sourcemaps.write('.', {
+      includeContent: false,
+      sourceRoot: '.',
+    }))
+    .pipe(gulp.dest('out'));
+}
+
+export function watchTypeScript() {
+  gulp.watch('src/**/*.ts', compileTypeScript);
+}
+
+/** Copy CSS files for the results view into the output directory. */
+export function copyViewCss() {
+  return gulp.src('src/view/*.css')
+    .pipe(gulp.dest('out'));
+}

extensions/ql-vscode/gulpfile.ts/webpack.config.ts

@@ -4,21 +4,28 @@ import * as webpack from 'webpack';
 export const config: webpack.Configuration = {
   mode: 'development',
   entry: {
-    resultsView: './src/view/results.tsx'
+    resultsView: './src/view/results.tsx',
+    compareView: './src/compare/view/Compare.tsx',
   },
   output: {
     path: path.resolve(__dirname, '..', 'out'),
-    filename: "[name].js"
+    filename: '[name].js'
   },
-  devtool: 'source-map',
+  devtool: 'inline-source-map',
   resolve: {
-    extensions: ['.js', '.ts', '.tsx', '.json']
+    extensions: ['.js', '.ts', '.tsx', '.json'],
+    fallback: {
+      path: require.resolve('path-browserify')
+    }
   },
   module: {
     rules: [
       {
         test: /\.(ts|tsx)$/,
         loader: 'ts-loader',
+        options: {
+          configFile: 'src/view/tsconfig.json',
+        }
       },
       {
         test: /\.less$/,

extensions/ql-vscode/gulpfile.ts/webpack.ts

@@ -0,0 +1,30 @@
+import * as webpack from 'webpack';
+import { config } from './webpack.config';
+
+export function compileView(cb: (err?: Error) => void) {
+  webpack(config).run((error, stats) => {
+    if (error) {
+      cb(error);
+    }
+    if (stats) {
+      console.log(stats.toString({
+        errorDetails: true,
+        colors: true,
+        assets: false,
+        builtAt: false,
+        version: false,
+        hash: false,
+        entrypoints: false,
+        timings: false,
+        modules: false,
+        errors: true
+      }));
+      if (stats.hasErrors()) {
+        cb(new Error('Compilation errors detected.'));
+        return;
+      }
+    }
+
+    cb();
+  });
+}

extensions/ql-vscode/language-configuration.json

@@ -1,72 +1,34 @@
 {
-    "comments": {
-        // symbol used for single line comment. Remove this entry if your language does not support line comments
-        "lineComment": "//",
-        // symbols used for start and end a block comment. Remove this entry if your language does not support block comments
-        "blockComment": [
-            "/*",
-            "*/"
-        ]
-    },
-    // symbols used as brackets
-    "brackets": [
-        [
-            "{",
-            "}"
-        ],
-        [
-            "[",
-            "]"
-        ],
-        [
-            "(",
-            ")"
-        ]
-    ],
-    // symbols that are auto closed when typing
-    "autoClosingPairs": [
-        [
-            "{",
-            "}"
-        ],
-        [
-            "[",
-            "]"
-        ],
-        [
-            "(",
-            ")"
-        ],
-        [
-            "\"",
-            "\""
-        ],
-        [
-            "'",
-            "'"
-        ]
-    ],
-    // symbols that that can be used to surround a selection
-    "surroundingPairs": [
-        [
-            "{",
-            "}"
-        ],
-        [
-            "[",
-            "]"
-        ],
-        [
-            "(",
-            ")"
-        ],
-        [
-            "\"",
-            "\""
-        ],
-        [
-            "'",
-            "'"
-        ]
-    ]
-}
+  "comments": {
+    "lineComment": "//",
+    "blockComment": ["/*", "*/"]
+  },
+  "brackets": [
+    ["{", "}"],
+    ["[", "]"],
+    ["(", ")"]
+  ],
+  "autoClosingPairs": [
+    { "open": "{", "close": "}" },
+    { "open": "[", "close": "]" },
+    { "open": "(", "close": ")" },
+    { "open": "'", "close": "'", "notIn": ["string", "comment"] },
+    { "open": "\"", "close": "\"", "notIn": ["string"] },
+    { "open": "/**", "close": " */", "notIn": ["string"] }
+  ],
+  "autoCloseBefore": ";:.=}])> \n\t",
+  "surroundingPairs": [
+    ["{", "}"],
+    ["[", "]"],
+    ["(", ")"],
+    ["'", "'"],
+    ["\"", "\""]
+  ],
+  "folding": {
+    "markers": {
+      "start": "^\\s*//\\s*#?region\\b",
+      "end": "^\\s*//\\s*#?endregion\\b"
+    }
+  },
+  "wordPattern": "(-?\\d*\\.\\d\\w*)|([^\\~\\!\\@\\#\\%\\^\\&\\*\\(\\)\\-\\=\\+\\[\\{\\]\\}\\\\\\|\\;\\:\\'\\\"\\.\\<\\>\\/\\?\\s]+)"
+}

extensions/ql-vscode/media/dark/archive-plus.svg

@@ -0,0 +1,5 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M14.5 1H1.5L1 1.5V4.5L1.5 5H2V13.5L2.5 14H13.5L14 13.5V5H14.5L15 4.5V1.5L14.5 1ZM13.5 4H2.5H2V2H14V4H13.5ZM3 13V5H13V13H3ZM11 7H5V8H11V7Z" fill="#C5C5C5"/>
+<line y2="12" x2="8" y1="12" x1="16" stroke-width="1" stroke="green" fill="none"/>
+<line y2="8" x2="12" y1="16" x1="12" stroke-width="1" stroke="green" fill="none"/>
+</svg>

extensions/ql-vscode/media/dark/clear-all.svg

@@ -0,0 +1,7 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M10 12.6L10.7 13.3L12.3 11.7L13.9 13.3L14.7 12.6L13 11L14.7 9.40005L13.9 8.60005L12.3 10.3L10.7 8.60005L10 9.40005L11.6 11L10 12.6Z" fill="#C5C5C5"/>
+<path d="M1 4L15 4L15 3L1 3L1 4Z" fill="#C5C5C5"/>
+<path d="M1 7L15 7L15 6L1 6L1 7Z" fill="#C5C5C5"/>
+<path d="M9 9.5L9 9L1 9L1 10L9 10L9 9.5Z" fill="#C5C5C5"/>
+<path d="M9 13L9 12.5L9 12L1 12L1 13L9 13Z" fill="#C5C5C5"/>
+</svg>

extensions/ql-vscode/media/dark/cloud-download.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M11.9565 6H12.0064C12.8004 6 13.5618 6.31607 14.1232 6.87868C14.6846 7.44129 15 8.20435 15 9C15 9.79565 14.6846 10.5587 14.1232 11.1213C13.5618 11.6839 12.8004 12 12.0064 12V11C12.5357 11 13.0434 10.7893 13.4176 10.4142C13.7919 10.0391 14.0021 9.53044 14.0021 9C14.0021 8.46957 13.7919 7.96086 13.4176 7.58579C13.0434 7.21072 12.5357 7 12.0064 7H11.0924L10.9687 6.143C10.8938 5.60541 10.6456 5.10711 10.2618 4.72407C9.87801 4.34103 9.37977 4.09427 8.84303 4.02143C8.30629 3.94859 7.76051 4.05365 7.2889 4.3206C6.81729 4.58754 6.44573 5.00173 6.23087 5.5L5.89759 6.262L5.08933 6.073C4.90382 6.02699 4.71364 6.0025 4.52255 6C3.86093 6 3.22641 6.2634 2.75858 6.73224C2.29075 7.20108 2.02792 7.83696 2.02792 8.5C2.02792 9.16304 2.29075 9.79893 2.75858 10.2678C3.22641 10.7366 3.86093 11 4.52255 11H5.02148V12H4.52255C4.02745 12.0043 3.5371 11.903 3.08403 11.7029C2.63096 11.5028 2.22553 11.2084 1.89461 10.8394C1.5637 10.4703 1.31488 10.0349 1.16465 9.56211C1.01442 9.08932 0.966217 8.58992 1.02324 8.09704C1.08026 7.60416 1.24121 7.12906 1.4954 6.70326C1.74959 6.27745 2.09121 5.91068 2.49762 5.62727C2.90402 5.34385 3.36591 5.15027 3.85264 5.05937C4.33938 4.96847 4.83984 4.98232 5.32083 5.1C5.6241 4.40501 6.14511 3.82799 6.80496 3.45635C7.4648 3.08472 8.22753 2.9387 8.9776 3.04044C9.72768 3.14217 10.4242 3.4861 10.9618 4.02014C11.4993 4.55418 11.8485 5.24923 11.9565 6ZM6.70719 11.1214L8.0212 12.4354V7H9.01506V12.3992L10.2929 11.1214L11 11.8285L8.85356 13.9749H8.14645L6.00008 11.8285L6.70719 11.1214Z" fill="#C5C5C5"/>
+</svg>

extensions/ql-vscode/media/dark/edit.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M13.23 1H11.77L3.52002 9.25L3.35999 9.46997L1 13.59L2.41003 15L6.53003 12.64L6.75 12.48L15 4.22998V2.77002L13.23 1ZM2.41003 13.59L3.92004 10.59L5.37 12.04L2.41003 13.59ZM6.23999 11.53L4.46997 9.76001L12.47 1.76001L14.24 3.53003L6.23999 11.53Z" fill="#C5C5C5"/>
+</svg>

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extensions/ql-vscode/media/light/preview.svg

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extensions/ql-vscode/media/light/sort-alpha.svg

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extensions/ql-vscode/media/light/sort-date.svg

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extensions/ql-vscode/media/light/sort-num.svg

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extensions/ql-vscode/media/light/trash.svg

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extensions/ql-vscode/media/logo.svg

@@ -1,14 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg width="27px" height="16px" viewBox="0 0 27 16" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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-    <desc>Created with Sketch.</desc>
-    <g id="light" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
-        <g id="QL" transform="translate(1.000000, 1.000000)">
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extensions/ql-vscode/package.json

@@ -4,7 +4,7 @@
   "description": "CodeQL for Visual Studio Code",
   "author": "GitHub",
   "private": true,
-  "version": "1.1.1",
+  "version": "1.5.6",
   "publisher": "GitHub",
   "license": "MIT",
   "icon": "media/VS-marketplace-CodeQL-icon.png",
@@ -13,7 +13,7 @@
     "url": "https://github.com/github/vscode-codeql"
   },
   "engines": {
-    "vscode": "^1.39.0"
+    "vscode": "^1.57.0"
   },
   "categories": [
     "Programming Languages"
@@ -21,14 +21,35 @@
   "extensionDependencies": [
     "hbenl.vscode-test-explorer"
   ],
+  "capabilities": {
+    "untrustedWorkspaces": {
+      "supported": "limited",
+      "description": "Workspace trust is required to execute commands that can contain arbitrary paths.",
+      "restrictedConfigurations": [
+        "codeQL.cli.executablePath",
+        "codeQL.runningTests.additionalTestArguments"
+      ]
+    }
+  },
   "activationEvents": [
     "onLanguage:ql",
     "onView:codeQLDatabases",
     "onView:codeQLQueryHistory",
+    "onView:codeQLAstViewer",
     "onView:test-explorer",
     "onCommand:codeQL.checkForUpdatesToCLI",
-    "onCommand:codeQL.chooseDatabase",
+    "onCommand:codeQL.authenticateToGitHub",
+    "onCommand:codeQLDatabases.chooseDatabaseFolder",
+    "onCommand:codeQLDatabases.chooseDatabaseArchive",
+    "onCommand:codeQLDatabases.chooseDatabaseInternet",
+    "onCommand:codeQLDatabases.chooseDatabaseLgtm",
     "onCommand:codeQL.setCurrentDatabase",
+    "onCommand:codeQL.viewAst",
+    "onCommand:codeQL.openReferencedFile",
+    "onCommand:codeQL.chooseDatabaseFolder",
+    "onCommand:codeQL.chooseDatabaseArchive",
+    "onCommand:codeQL.chooseDatabaseInternet",
+    "onCommand:codeQL.chooseDatabaseLgtm",
     "onCommand:codeQLDatabases.chooseDatabase",
     "onCommand:codeQLDatabases.setCurrentDatabase",
     "onCommand:codeQL.quickQuery",
@@ -77,6 +98,12 @@
           ".dbscheme"
         ],
         "configuration": "./language-configuration.json"
+      },
+      {
+        "id": "xml",
+        "extensions": [
+          ".qhelp"
+        ]
       }
     ],
     "grammars": [
@@ -91,23 +118,44 @@
         "path": "./out/syntaxes/dbscheme.tmLanguage.json"
       }
     ],
+    "snippets": [
+      {
+        "language": "ql",
+        "path": "./snippets.json"
+      }
+    ],
     "configuration": {
       "type": "object",
       "title": "CodeQL",
       "properties": {
         "codeQL.cli.executablePath": {
-          "scope": "machine",
+          "scope": "window",
           "type": "string",
           "default": "",
-          "description": "Path to the CodeQL executable that should be used by the CodeQL extension. The executable is named `codeql` on Linux/Mac and `codeql.exe` on Windows. This overrides all other CodeQL CLI settings."
+          "markdownDescription": "Path to the CodeQL executable that should be used by the CodeQL extension. The executable is named `codeql` on Linux/Mac and `codeql.exe` on Windows. If empty, the extension will look for a CodeQL executable on your shell PATH, or if CodeQL is not on your PATH, download and manage its own CodeQL executable."
         },
         "codeQL.runningQueries.numberOfThreads": {
           "type": "integer",
           "default": 1,
-          "minimum": 1,
+          "minimum": 0,
           "maximum": 1024,
           "description": "Number of threads for running queries."
         },
+        "codeQL.runningQueries.saveCache": {
+          "type": "boolean",
+          "default": false,
+          "scope": "window",
+          "description": "Aggressively save intermediate results to the disk cache. This may speed up subsequent queries if they are similar. Be aware that using this option will greatly increase disk usage and initial evaluation time."
+        },
+        "codeQL.runningQueries.cacheSize": {
+          "type": [
+            "integer",
+            "null"
+          ],
+          "default": null,
+          "minimum": 1024,
+          "description": "Maximum size of the disk cache (in MB). Leave blank to allow the evaluator to automatically adjust the size of the disk cache based on the size of the codebase and the complexity of the queries being executed."
+        },
         "codeQL.runningQueries.timeout": {
           "type": [
             "integer",
@@ -132,46 +180,177 @@
           "default": false,
           "description": "Enable debug logging and tuple counting when running CodeQL queries. This information is useful for debugging query performance."
         },
+        "codeQL.runningQueries.maxPaths": {
+          "type": "integer",
+          "default": 4,
+          "minimum": 1,
+          "maximum": 256,
+          "markdownDescription": "Max number of paths to display for each alert found by a path query (`@kind path-problem`)."
+        },
+        "codeQL.runningQueries.autoSave": {
+          "type": "boolean",
+          "default": false,
+          "description": "Enable automatically saving a modified query file when running a query."
+        },
+        "codeQL.runningQueries.maxQueries": {
+          "type": "integer",
+          "default": 20,
+          "description": "Max number of simultaneous queries to run using the 'CodeQL: Run Queries' command."
+        },
+        "codeQL.runningQueries.customLogDirectory": {
+          "type": [
+            "string",
+            null
+          ],
+          "default": null,
+          "description": "Path to a directory where the CodeQL extension should store query server logs. If empty, the extension stores logs in a temporary workspace folder and deletes the contents after each run."
+        },
+        "codeQL.resultsDisplay.pageSize": {
+          "type": "integer",
+          "default": 200,
+          "description": "Max number of query results to display per page in the results view."
+        },
         "codeQL.queryHistory.format": {
           "type": "string",
-          "default": "[%t] %q on %d - %s",
-          "description": "Default string for how to label query history items. %t is the time of the query, %q is the query name, %d is the database name, and %s is a status string."
+          "default": "%q on %d - %s, %r result count [%t]",
+          "markdownDescription": "Default string for how to label query history items.\n* %t is the time of the query\n* %q is the human-readable query name\n* %f is the query file name\n* %d is the database name\n* %r is the number of results\n* %s is a status string"
+        },
+        "codeQL.runningTests.additionalTestArguments": {
+          "scope": "window",
+          "type": "array",
+          "default": [],
+          "markdownDescription": "Additional command line arguments to pass to the CLI when [running tests](https://codeql.github.com/docs/codeql-cli/manual/test-run/). This setting should be an array of strings, each containing an argument to be passed."
         },
         "codeQL.runningTests.numberOfThreads": {
           "scope": "window",
           "type": "integer",
           "default": 1,
-          "minimum": 1,
+          "minimum": 0,
           "maximum": 1024,
           "description": "Number of threads for running CodeQL tests."
+        },
+        "codeQL.telemetry.enableTelemetry": {
+          "type": "boolean",
+          "default": false,
+          "scope": "application",
+          "markdownDescription": "Specifies whether to send CodeQL usage telemetry. This setting AND the global `#telemetry.enableTelemetry#` setting must be checked for telemetry to be sent to GitHub. For more information, see the [telemetry documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/about-telemetry-in-codeql-for-visual-studio-code)"
+        },
+        "codeQL.telemetry.logTelemetry": {
+          "type": "boolean",
+          "default": false,
+          "scope": "application",
+          "description": "Specifies whether or not to write telemetry events to the extension log."
+        },
+        "codeQL.remoteQueries.repositoryLists": {
+          "type": [
+            "object",
+            null
+          ],
+          "patternProperties": {
+            ".*": {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            }
+          },
+          "default": null,
+          "markdownDescription": "[For internal use only] Lists of GitHub repositories that you want to query remotely. This should be a JSON object where each key is a user-specified name for this repository list, and the value is an array of GitHub repositories (of the form `<owner>/<repo>`)."
+        },
+        "codeQL.remoteQueries.controllerRepo": {
+          "type": "string",
+          "default": "",
+          "pattern": "^$|^(?:[a-zA-Z0-9]+-)*[a-zA-Z0-9]+/[a-zA-Z0-9-_]+$",
+          "patternErrorMessage": "Please enter a valid GitHub repository",
+          "markdownDescription": "[For internal use only] The name of the GitHub repository where you can view the progress and results of the \"Run Remote query\" command. The repository should be of the form `<owner>/<repo>`)."
         }
       }
     },
     "commands": [
+      {
+        "command": "codeQL.authenticateToGitHub",
+        "title": "CodeQL: Authenticate to GitHub"
+      },
       {
         "command": "codeQL.runQuery",
         "title": "CodeQL: Run Query"
       },
+      {
+        "command": "codeQL.runQueryOnMultipleDatabases",
+        "title": "CodeQL: Run Query on Multiple Databases"
+      },
+      {
+        "command": "codeQL.runRemoteQuery",
+        "title": "CodeQL: Run Remote Query"
+      },
+      {
+        "command": "codeQL.runQueries",
+        "title": "CodeQL: Run Queries in Selected Files"
+      },
       {
         "command": "codeQL.quickEval",
         "title": "CodeQL: Quick Evaluation"
       },
+      {
+        "command": "codeQL.openReferencedFile",
+        "title": "CodeQL: Open Referenced File"
+      },
       {
         "command": "codeQL.quickQuery",
         "title": "CodeQL: Quick Query"
       },
       {
-        "command": "codeQL.chooseDatabase",
-        "title": "CodeQL: Choose Database",
+        "command": "codeQL.openDocumentation",
+        "title": "CodeQL: Open Documentation"
+      },
+      {
+        "command": "codeQL.copyVersion",
+        "title": "CodeQL: Copy Version Information"
+      },
+      {
+        "command": "codeQLDatabases.chooseDatabaseFolder",
+        "title": "Choose Database from Folder",
         "icon": {
-          "light": "media/black-plus.svg",
-          "dark": "media/white-plus.svg"
+          "light": "media/light/folder-opened-plus.svg",
+          "dark": "media/dark/folder-opened-plus.svg"
+        }
+      },
+      {
+        "command": "codeQLDatabases.removeOrphanedDatabases",
+        "title": "Delete unused databases"
+      },
+      {
+        "command": "codeQLDatabases.chooseDatabaseArchive",
+        "title": "Choose Database from Archive",
+        "icon": {
+          "light": "media/light/archive-plus.svg",
+          "dark": "media/dark/archive-plus.svg"
+        }
+      },
+      {
+        "command": "codeQLDatabases.chooseDatabaseInternet",
+        "title": "Download Database",
+        "icon": {
+          "light": "media/light/cloud-download.svg",
+          "dark": "media/dark/cloud-download.svg"
+        }
+      },
+      {
+        "command": "codeQLDatabases.chooseDatabaseLgtm",
+        "title": "Download from LGTM",
+        "icon": {
+          "light": "media/light/lgtm-plus.svg",
+          "dark": "media/dark/lgtm-plus.svg"
         }
       },
       {
         "command": "codeQL.setCurrentDatabase",
         "title": "CodeQL: Set Current Database"
       },
+      {
+        "command": "codeQL.viewAst",
+        "title": "CodeQL: View AST"
+      },
       {
         "command": "codeQL.upgradeCurrentDatabase",
         "title": "CodeQL: Upgrade Current Database"
@@ -192,26 +371,134 @@
         "command": "codeQLDatabases.upgradeDatabase",
         "title": "Upgrade Database"
       },
+      {
+        "command": "codeQLDatabases.renameDatabase",
+        "title": "Rename Database"
+      },
+      {
+        "command": "codeQLDatabases.openDatabaseFolder",
+        "title": "Show Database Directory"
+      },
+      {
+        "command": "codeQLDatabases.addDatabaseSource",
+        "title": "Add Database Source to Workspace"
+      },
+      {
+        "command": "codeQL.chooseDatabaseFolder",
+        "title": "CodeQL: Choose Database from Folder"
+      },
+      {
+        "command": "codeQL.chooseDatabaseArchive",
+        "title": "CodeQL: Choose Database from Archive"
+      },
+      {
+        "command": "codeQL.chooseDatabaseInternet",
+        "title": "CodeQL: Download Database"
+      },
+      {
+        "command": "codeQL.chooseDatabaseLgtm",
+        "title": "CodeQL: Download Database from LGTM"
+      },
+      {
+        "command": "codeQLDatabases.sortByName",
+        "title": "Sort by Name",
+        "icon": {
+          "light": "media/light/sort-alpha.svg",
+          "dark": "media/dark/sort-alpha.svg"
+        }
+      },
+      {
+        "command": "codeQLDatabases.sortByDateAdded",
+        "title": "Sort by Date Added",
+        "icon": {
+          "light": "media/light/sort-date.svg",
+          "dark": "media/dark/sort-date.svg"
+        }
+      },
       {
         "command": "codeQL.checkForUpdatesToCLI",
         "title": "CodeQL: Check for CLI Updates"
       },
       {
         "command": "codeQLQueryHistory.openQuery",
-        "title": "Open Query"
-      },
-      {
-        "command": "codeQLQueryHistory.removeHistoryItem",
-        "title": "Remove History Item"
+        "title": "Open the query that produced these results",
+        "icon": {
+          "light": "media/light/edit.svg",
+          "dark": "media/dark/edit.svg"
+        }
       },
       {
         "command": "codeQLQueryHistory.itemClicked",
-        "title": "Query History Item"
+        "title": "Open Query Results",
+        "icon": {
+          "light": "media/light/preview.svg",
+          "dark": "media/dark/preview.svg"
+        }
+      },
+      {
+        "command": "codeQLQueryHistory.removeHistoryItem",
+        "title": "Remove History Item(s)",
+        "icon": {
+          "light": "media/light/trash.svg",
+          "dark": "media/dark/trash.svg"
+        }
+      },
+      {
+        "command": "codeQLQueryHistory.sortByName",
+        "title": "Sort by Name",
+        "icon": {
+          "light": "media/light/sort-alpha.svg",
+          "dark": "media/dark/sort-alpha.svg"
+        }
+      },
+      {
+        "command": "codeQLQueryHistory.sortByDate",
+        "title": "Sort by Query Date",
+        "icon": {
+          "light": "media/light/sort-date.svg",
+          "dark": "media/dark/sort-date.svg"
+        }
+      },
+      {
+        "command": "codeQLQueryHistory.sortByCount",
+        "title": "Sort by Results Count",
+        "icon": {
+          "light": "media/light/sort-num.svg",
+          "dark": "media/dark/sort-num.svg"
+        }
       },
       {
         "command": "codeQLQueryHistory.showQueryLog",
         "title": "Show Query Log"
       },
+      {
+        "command": "codeQLQueryHistory.showQueryText",
+        "title": "Show Query Text"
+      },
+      {
+        "command": "codeQLQueryHistory.viewCsvResults",
+        "title": "View Results (CSV)"
+      },
+      {
+        "command": "codeQLQueryHistory.viewCsvAlerts",
+        "title": "View Alerts (CSV)"
+      },
+      {
+        "command": "codeQLQueryHistory.viewSarifAlerts",
+        "title": "View Alerts (SARIF)"
+      },
+      {
+        "command": "codeQLQueryHistory.viewDil",
+        "title": "View DIL"
+      },
+      {
+        "command": "codeQLQueryHistory.setLabel",
+        "title": "Set Label"
+      },
+      {
+        "command": "codeQLQueryHistory.compareWith",
+        "title": "Compare Results"
+      },
       {
         "command": "codeQLQueryResults.nextPathStep",
         "title": "CodeQL: Show Next Step on Path"
@@ -220,29 +507,97 @@
         "command": "codeQLQueryResults.previousPathStep",
         "title": "CodeQL: Show Previous Step on Path"
       },
-      {
-        "command": "codeQLQueryHistory.setLabel",
-        "title": "Set Label"
-      },
       {
         "command": "codeQL.restartQueryServer",
         "title": "CodeQL: Restart Query Server"
       },
       {
         "command": "codeQLTests.showOutputDifferences",
-        "title": "CodeQL: Show Test Output Differences"
+        "title": "Show Test Output Differences"
       },
       {
         "command": "codeQLTests.acceptOutput",
-        "title": "CodeQL: Accept Test Output"
+        "title": "Accept Test Output"
+      },
+      {
+        "command": "codeQLAstViewer.gotoCode",
+        "title": "Go To Code"
+      },
+      {
+        "command": "codeQLAstViewer.clear",
+        "title": "Clear AST",
+        "icon": {
+          "light": "media/light/clear-all.svg",
+          "dark": "media/dark/clear-all.svg"
+        }
       }
     ],
     "menus": {
       "view/title": [
         {
-          "command": "codeQL.chooseDatabase",
+          "command": "codeQLDatabases.sortByName",
           "when": "view == codeQLDatabases",
           "group": "navigation"
+        },
+        {
+          "command": "codeQLDatabases.sortByDateAdded",
+          "when": "view == codeQLDatabases",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLDatabases.chooseDatabaseFolder",
+          "when": "view == codeQLDatabases",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLDatabases.chooseDatabaseArchive",
+          "when": "view == codeQLDatabases",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLDatabases.chooseDatabaseInternet",
+          "when": "view == codeQLDatabases",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLDatabases.chooseDatabaseLgtm",
+          "when": "view == codeQLDatabases",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLQueryHistory.openQuery",
+          "when": "view == codeQLQueryHistory",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLQueryHistory.itemClicked",
+          "when": "view == codeQLQueryHistory",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLQueryHistory.removeHistoryItem",
+          "when": "view == codeQLQueryHistory",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLQueryHistory.sortByName",
+          "when": "view == codeQLQueryHistory",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLQueryHistory.sortByDate",
+          "when": "view == codeQLQueryHistory",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLQueryHistory.sortByCount",
+          "when": "view == codeQLQueryHistory",
+          "group": "navigation"
+        },
+        {
+          "command": "codeQLAstViewer.clear",
+          "when": "view == codeQLAstViewer",
+          "group": "navigation"
         }
       ],
       "view/item/context": [
@@ -261,6 +616,21 @@
           "group": "9_qlCommands",
           "when": "view == codeQLDatabases"
         },
+        {
+          "command": "codeQLDatabases.renameDatabase",
+          "group": "9_qlCommands",
+          "when": "view == codeQLDatabases"
+        },
+        {
+          "command": "codeQLDatabases.openDatabaseFolder",
+          "group": "9_qlCommands",
+          "when": "view == codeQLDatabases"
+        },
+        {
+          "command": "codeQLDatabases.addDatabaseSource",
+          "group": "9_qlCommands",
+          "when": "view == codeQLDatabases"
+        },
         {
           "command": "codeQLQueryHistory.openQuery",
           "group": "9_qlCommands",
@@ -276,11 +646,41 @@
           "group": "9_qlCommands",
           "when": "view == codeQLQueryHistory"
         },
+        {
+          "command": "codeQLQueryHistory.compareWith",
+          "group": "9_qlCommands",
+          "when": "view == codeQLQueryHistory"
+        },
         {
           "command": "codeQLQueryHistory.showQueryLog",
           "group": "9_qlCommands",
           "when": "view == codeQLQueryHistory"
         },
+        {
+          "command": "codeQLQueryHistory.showQueryText",
+          "group": "9_qlCommands",
+          "when": "view == codeQLQueryHistory"
+        },
+        {
+          "command": "codeQLQueryHistory.viewCsvResults",
+          "group": "9_qlCommands",
+          "when": "view == codeQLQueryHistory && viewItem != interpretedResultsItem"
+        },
+        {
+          "command": "codeQLQueryHistory.viewCsvAlerts",
+          "group": "9_qlCommands",
+          "when": "view == codeQLQueryHistory && viewItem == interpretedResultsItem"
+        },
+        {
+          "command": "codeQLQueryHistory.viewSarifAlerts",
+          "group": "9_qlCommands",
+          "when": "view == codeQLQueryHistory && viewItem == interpretedResultsItem"
+        },
+        {
+          "command": "codeQLQueryHistory.viewDil",
+          "group": "9_qlCommands",
+          "when": "view == codeQLQueryHistory"
+        },
         {
           "command": "codeQLTests.showOutputDifferences",
           "group": "qltest@1",
@@ -296,35 +696,113 @@
         {
           "command": "codeQL.setCurrentDatabase",
           "group": "9_qlCommands",
-          "when": "resourceScheme == codeql-zip-archive || explorerResourceIsFolder"
+          "when": "resourceScheme == codeql-zip-archive || explorerResourceIsFolder || resourceExtname == .zip"
         },
         {
-          "command": "codeQL.runQuery",
+          "command": "codeQL.viewAst",
           "group": "9_qlCommands",
-          "when": "resourceLangId == ql && resourceExtname == .ql"
+          "when": "resourceScheme == codeql-zip-archive"
+        },
+        {
+          "command": "codeQL.runQueries",
+          "group": "9_qlCommands",
+          "when": "resourceScheme != codeql-zip-archive"
+        },
+        {
+          "command": "codeQL.openReferencedFile",
+          "group": "9_qlCommands",
+          "when": "resourceExtname == .qlref"
         }
       ],
       "commandPalette": [
+        {
+          "command": "codeQL.authenticateToGitHub",
+          "when": "config.codeQL.canary"
+        },
         {
           "command": "codeQL.runQuery",
           "when": "resourceLangId == ql && resourceExtname == .ql"
         },
+        {
+          "command": "codeQL.runQueryOnMultipleDatabases",
+          "when": "resourceLangId == ql && resourceExtname == .ql"
+        },
+        {
+          "command": "codeQL.runRemoteQuery",
+          "when": "config.codeQL.canary && editorLangId == ql && resourceExtname == .ql"
+        },
+        {
+          "command": "codeQL.runQueries",
+          "when": "false"
+        },
         {
           "command": "codeQL.quickEval",
           "when": "editorLangId == ql"
         },
+        {
+          "command": "codeQL.openReferencedFile",
+          "when": "resourceExtname == .qlref"
+        },
         {
           "command": "codeQL.setCurrentDatabase",
           "when": "false"
         },
+        {
+          "command": "codeQL.viewAst",
+          "when": "resourceScheme == codeql-zip-archive"
+        },
         {
           "command": "codeQLDatabases.setCurrentDatabase",
           "when": "false"
         },
+        {
+          "command": "codeQLDatabases.renameDatabase",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.openDatabaseFolder",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.addDatabaseSource",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.sortByName",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.sortByDateAdded",
+          "when": "false"
+        },
         {
           "command": "codeQLDatabases.removeDatabase",
           "when": "false"
         },
+        {
+          "command": "codeQLDatabases.chooseDatabaseFolder",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.chooseDatabaseArchive",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.removeOrphanedDatabases",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.chooseDatabaseInternet",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.chooseDatabaseLgtm",
+          "when": "false"
+        },
+        {
+          "command": "codeQLDatabases.upgradeDatabase",
+          "when": "false"
+        },
         {
           "command": "codeQLQueryHistory.openQuery",
           "when": "false"
@@ -341,9 +819,61 @@
           "command": "codeQLQueryHistory.showQueryLog",
           "when": "false"
         },
+        {
+          "command": "codeQLQueryHistory.showQueryText",
+          "when": "false"
+        },
+        {
+          "command": "codeQLQueryHistory.viewCsvResults",
+          "when": "false"
+        },
+        {
+          "command": "codeQLQueryHistory.viewCsvAlerts",
+          "when": "false"
+        },
+        {
+          "command": "codeQLQueryHistory.viewSarifAlerts",
+          "when": "false"
+        },
+        {
+          "command": "codeQLQueryHistory.viewDil",
+          "when": "false"
+        },
         {
           "command": "codeQLQueryHistory.setLabel",
           "when": "false"
+        },
+        {
+          "command": "codeQLQueryHistory.compareWith",
+          "when": "false"
+        },
+        {
+          "command": "codeQLQueryHistory.sortByName",
+          "when": "false"
+        },
+        {
+          "command": "codeQLQueryHistory.sortByDate",
+          "when": "false"
+        },
+        {
+          "command": "codeQLQueryHistory.sortByCount",
+          "when": "false"
+        },
+        {
+          "command": "codeQLAstViewer.gotoCode",
+          "when": "false"
+        },
+        {
+          "command": "codeQLAstViewer.clear",
+          "when": "false"
+        },
+        {
+          "command": "codeQLTests.acceptOutput",
+          "when": "false"
+        },
+        {
+          "command": "codeQLTests.showOutputDifferences",
+          "when": "false"
         }
       ],
       "editor/context": [
@@ -351,9 +881,25 @@
           "command": "codeQL.runQuery",
           "when": "editorLangId == ql && resourceExtname == .ql"
         },
+        {
+          "command": "codeQL.runQueryOnMultipleDatabases",
+          "when": "editorLangId == ql && resourceExtname == .ql"
+        },
+        {
+          "command": "codeQL.runRemoteQuery",
+          "when": "config.codeQL.canary && editorLangId == ql && resourceExtname == .ql"
+        },
+        {
+          "command": "codeQL.viewAst",
+          "when": "resourceScheme == codeql-zip-archive"
+        },
         {
           "command": "codeQL.quickEval",
           "when": "editorLangId == ql"
+        },
+        {
+          "command": "codeQL.openReferencedFile",
+          "when": "resourceExtname == .qlref"
         }
       ]
     },
@@ -375,9 +921,27 @@
         {
           "id": "codeQLQueryHistory",
           "name": "Query History"
+        },
+        {
+          "id": "codeQLAstViewer",
+          "name": "AST Viewer"
         }
       ]
-    }
+    },
+    "viewsWelcome": [
+      {
+        "view": "codeQLAstViewer",
+        "contents": "Run the 'CodeQL: View AST' command on an open source file from a CodeQL database.\n[View AST](command:codeQL.viewAst)"
+      },
+      {
+        "view": "codeQLQueryHistory",
+        "contents": "Run the 'CodeQL: Run Query' command on a QL query.\n[Run Query](command:codeQL.runQuery)"
+      },
+      {
+        "view": "codeQLDatabases",
+        "contents": "Add a CodeQL database:\n[From a folder](command:codeQLDatabases.chooseDatabaseFolder)\n[From an archive](command:codeQLDatabases.chooseDatabaseArchive)\n[From a URL (as a zip file)](command:codeQLDatabases.chooseDatabaseInternet)\n[From LGTM](command:codeQLDatabases.chooseDatabaseLgtm)"
+      }
+    ]
   },
   "scripts": {
     "build": "gulp",
@@ -385,86 +949,118 @@
     "watch:extension": "tsc --watch",
     "test": "mocha --exit -r ts-node/register test/pure-tests/**/*.ts",
     "preintegration": "rm -rf ./out/vscode-tests && gulp",
-    "integration": "node ./out/vscode-tests/run-integration-tests.js",
+    "integration": "node ./out/vscode-tests/run-integration-tests.js no-workspace,minimal-workspace",
+    "cli-integration": "npm run preintegration && node ./out/vscode-tests/run-integration-tests.js cli-integration",
     "update-vscode": "node ./node_modules/vscode/bin/install",
-    "postinstall": "node ./node_modules/vscode/bin/install",
-    "format": "tsfmt -r",
-    "lint": "eslint . --ext .ts,.tsx"
+    "format": "tsfmt -r && eslint src test --ext .ts,.tsx --fix",
+    "lint": "eslint src test --ext .ts,.tsx --max-warnings=0",
+    "format-staged": "lint-staged"
   },
   "dependencies": {
+    "@octokit/rest": "^18.5.6",
     "child-process-promise": "^2.2.1",
     "classnames": "~2.2.6",
-    "fs-extra": "^8.1.0",
+    "fs-extra": "^9.0.1",
     "glob-promise": "^3.4.0",
-    "js-yaml": "^3.12.0",
+    "js-yaml": "^3.14.0",
+    "minimist": "~1.2.5",
     "node-fetch": "~2.6.0",
+    "path-browserify": "^1.0.1",
     "react": "^16.8.6",
     "react-dom": "^16.8.6",
-    "semmle-bqrs": "^0.0.1",
-    "semmle-io-node": "^0.0.1",
-    "semmle-vscode-utils": "^0.0.1",
+    "semver": "~7.3.2",
     "tmp": "^0.1.0",
+    "tmp-promise": "~3.0.2",
     "tree-kill": "~1.2.2",
     "unzipper": "~0.10.5",
-    "vscode-jsonrpc": "^4.0.0",
-    "vscode-languageclient": "^5.2.1",
+    "vscode-extension-telemetry": "^0.1.6",
+    "vscode-jsonrpc": "^5.0.1",
+    "vscode-languageclient": "^6.1.3",
     "vscode-test-adapter-api": "~1.7.0",
     "vscode-test-adapter-util": "~0.7.0",
-    "minimist": "~1.2.5"
+    "zip-a-folder": "~0.0.12"
   },
   "devDependencies": {
     "@types/chai": "^4.1.7",
+    "@types/chai-as-promised": "~7.1.2",
     "@types/child-process-promise": "^2.2.1",
     "@types/classnames": "~2.2.9",
-    "@types/fs-extra": "^8.0.0",
+    "@types/fs-extra": "^9.0.6",
     "@types/glob": "^7.1.1",
     "@types/google-protobuf": "^3.2.7",
-    "@types/gulp": "^4.0.6",
-    "@types/js-yaml": "~3.12.1",
+    "@types/gulp": "^4.0.9",
+    "@types/gulp-replace": "0.0.31",
+    "@types/gulp-sourcemaps": "0.0.32",
+    "@types/js-yaml": "^3.12.5",
     "@types/jszip": "~3.1.6",
-    "@types/mocha": "~5.2.7",
-    "@types/node": "^12.0.8",
+    "@types/mocha": "^8.2.0",
+    "@types/node": "^12.14.1",
     "@types/node-fetch": "~2.5.2",
+    "@types/proxyquire": "~1.3.28",
     "@types/react": "^16.8.17",
     "@types/react-dom": "^16.8.4",
     "@types/sarif": "~2.1.2",
+    "@types/semver": "~7.2.0",
+    "@types/sinon": "~7.5.2",
+    "@types/sinon-chai": "~3.2.3",
+    "@types/through2": "^2.0.36",
     "@types/tmp": "^0.1.0",
     "@types/unzipper": "~0.10.1",
-    "@types/vscode": "^1.39.0",
+    "@types/vscode": "^1.57.0",
     "@types/webpack": "^4.32.1",
     "@types/xml2js": "~0.4.4",
-    "build-tasks": "^0.0.1",
+    "@typescript-eslint/eslint-plugin": "^4.26.0",
+    "@typescript-eslint/parser": "^4.26.0",
+    "ansi-colors": "^4.1.1",
+    "applicationinsights": "^1.8.7",
     "chai": "^4.2.0",
+    "chai-as-promised": "~7.1.1",
     "css-loader": "~3.1.0",
+    "eslint": "~6.8.0",
+    "eslint-plugin-react": "~7.19.0",
     "glob": "^7.1.4",
     "gulp": "^4.0.2",
+    "gulp-replace": "^1.0.0",
     "gulp-sourcemaps": "^2.6.5",
     "gulp-typescript": "^5.0.1",
-    "mocha": "~6.2.1",
+    "husky": "~4.2.5",
+    "jsonc-parser": "^2.3.0",
+    "lint-staged": "~10.2.2",
+    "mocha": "^8.2.1",
     "mocha-sinon": "~2.1.0",
     "npm-run-all": "^4.1.5",
+    "prettier": "~2.0.5",
+    "proxyquire": "~2.1.3",
     "sinon": "~9.0.0",
+    "sinon-chai": "~3.5.0",
     "style-loader": "~0.23.1",
     "through2": "^3.0.1",
-    "ts-loader": "^5.4.5",
+    "ts-loader": "^8.1.0",
     "ts-node": "^8.3.0",
     "ts-protoc-gen": "^0.9.0",
-    "typescript": "^3.7.2",
-    "typescript-config": "^0.0.1",
+    "typescript": "^4.3.2",
     "typescript-formatter": "^7.2.2",
     "vsce": "^1.65.0",
-    "vscode-test": "^1.0.0",
-    "webpack": "^4.38.0",
-    "webpack-cli": "^3.3.2",
-    "eslint": "~6.8.0",
-    "@typescript-eslint/eslint-plugin": "~2.23.0",
-    "@typescript-eslint/parser": "~2.23.0",
-    "chai-as-promised": "~7.1.1",
-    "@types/chai-as-promised": "~7.1.2",
-    "@types/sinon": "~7.5.2",
-    "sinon-chai": "~3.5.0",
-    "@types/sinon-chai": "~3.2.3",
-    "proxyquire": "~2.1.3",
-    "@types/proxyquire": "~1.3.28"
+    "vscode-test": "^1.4.0",
+    "webpack": "^5.28.0",
+    "webpack-cli": "^4.6.0"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "npm run format-staged",
+      "pre-push": "npm run lint"
+    }
+  },
+  "lint-staged": {
+    "./**/*.{json,css,scss,md}": [
+      "prettier --write"
+    ],
+    "./**/*.{ts,tsx}": [
+      "tsfmt -r",
+      "eslint --fix"
+    ]
+  },
+  "resolutions": {
+    "glob-parent": "~6.0.0"
   }
 }

extensions/ql-vscode/snippets.json

@@ -0,0 +1,134 @@
+{
+  "Query Metadata": {
+    "prefix": "querymetadata",
+    "body": [
+      "/**",
+      " * @name $1",
+      " * @description $2",
+      " * @kind $3",
+      " * @id $4",
+      " * @tags $5",
+      " */"
+    ],
+    "description": "Metadata for a query"
+  },
+  "Class": {
+    "prefix": "class",
+    "body": ["class $1 extends $2 {", "\t$0", "}"],
+    "description": "A class"
+  },
+  "From/Where/Select": {
+    "prefix": "from",
+    "body": ["from $1", "where $2", "select $3"],
+    "description": "A from/where/select statement"
+  },
+  "Predicate": {
+    "prefix": "predicate",
+    "body": ["predicate $1($2) {", "\t$0", "}"],
+    "description": "A predicate"
+  },
+  "Dataflow Tracking Class": {
+    "prefix": "dataflowtracking",
+    "body": [
+      "class $1 extends DataFlow::Configuration {",
+      "\t$1() { this = \"$1\" }",
+      "\t",
+      "\toverride predicate isSource(DataFlow::Node node) {",
+      "\t\t${2:none()}",
+      "\t}",
+      "\t",
+      "\toverride predicate isSink(DataFlow::Node node) {",
+      "\t\t${3:none()}",
+      "\t}",
+      "}"
+    ],
+    "description": "Boilerplate for a dataflow tracking class"
+  },
+  "Taint Tracking Class": {
+    "prefix": "tainttracking",
+    "body": [
+      "class $1 extends TaintTracking::Configuration {",
+      "\t$1() { this = \"$1\" }",
+      "\t",
+      "\toverride predicate isSource(DataFlow::Node node) {",
+      "\t\t${2:none()}",
+      "\t}",
+      "\t",
+      "\toverride predicate isSink(DataFlow::Node node) {",
+      "\t\t${3:none()}",
+      "\t}",
+      "}"
+    ],
+    "description": "Boilerplate for a taint tracking class"
+  },
+  "Count": {
+    "prefix": "count",
+    "body": ["count($1 | $2 | $3)"],
+    "description": "A count aggregate"
+  },
+  "Max": {
+    "prefix": "max",
+    "body": ["max($1 | $2 | $3)"],
+    "description": "A max aggregate"
+  },
+  "Min": {
+    "prefix": "min",
+    "body": ["min($1 | $2 | $3)"],
+    "description": "A min aggregate"
+  },
+  "Average": {
+    "prefix": "avg",
+    "body": ["avg($1 | $2 | $3)"],
+    "description": "An average aggregate"
+  },
+  "Sum": {
+    "prefix": "sum",
+    "body": ["sum($1 | $2 | $3)"],
+    "description": "A sum aggregate"
+  },
+  "Concatenation": {
+    "prefix": "concat",
+    "body": ["concat($1 | $2 | $3)"],
+    "description": "A concatenation aggregate"
+  },
+  "Rank": {
+    "prefix": "rank",
+    "body": ["rank[$1]($2 | $3 | $4)"],
+    "description": "A rank aggregate"
+  },
+  "Strict Sum": {
+    "prefix": "strictsum",
+    "body": ["strictsum($1 | $2 | $3)"],
+    "description": "A strict sum aggregate"
+  },
+  "Strict Concatenation": {
+    "prefix": "strictconcat",
+    "body": ["strictconcat($1 | $2 | $3)"],
+    "description": "A strict concatenation aggregate"
+  },
+  "Strict Count": {
+    "prefix": "strictcount",
+    "body": ["strictcount($1 | $2 | $3)"],
+    "description": "A strict count aggregate"
+  },
+  "Unique": {
+    "prefix": "unique",
+    "body": ["unique($1 | $2 | $3)"],
+    "description": "A unique aggregate"
+  },
+  "Exists": {
+    "prefix": "exists",
+    "body": ["exists($1 | $2 | $3)"],
+    "description": "An exists quantifier"
+  },
+  "For All": {
+    "prefix": "forall",
+    "body": ["forall($1 | $2 | $3)"],
+    "description": "A for all quantifier"
+  },
+  "For All and Exists": {
+    "prefix": "forex",
+    "body": ["forex($1 | $2 | $3)"],
+    "description": "A for all and exists quantifier"
+  }
+}

extensions/ql-vscode/src/archive-filesystem-provider.ts

@@ -84,12 +84,25 @@ export function encodeSourceArchiveUri(ref: ZipFileReference): vscode.Uri {
   // This lets us separate the paths, ignoring the leading slash if we added one.
   const sourceArchiveZipPathEndIndex = sourceArchiveZipPathStartIndex + sourceArchiveZipPath.length;
   const authority = `${sourceArchiveZipPathStartIndex}-${sourceArchiveZipPathEndIndex}`;
-  return vscode.Uri.parse(zipArchiveScheme + ':/').with({
+  return vscode.Uri.parse(zipArchiveScheme + ':/', true).with({
     path: encodedPath,
     authority,
   });
 }
 
+/**
+ * Convenience method to create a codeql-zip-archive with a path to the root
+ * archive
+ *
+ * @param pathToArchive the filesystem path to the root of the archive
+ */
+export function encodeArchiveBasePath(sourceArchiveZipPath: string) {
+  return encodeSourceArchiveUri({
+    sourceArchiveZipPath,
+    pathWithinSourceArchive: ''
+  });
+}
+
 const sourceArchiveUriAuthorityPattern = /^(\d+)-(\d+)$/;
 
 class InvalidSourceArchiveUriError extends Error {
@@ -100,6 +113,14 @@ class InvalidSourceArchiveUriError extends Error {
 
 /** Decodes an encoded source archive URI into its corresponding paths. Inverse of `encodeSourceArchiveUri`. */
 export function decodeSourceArchiveUri(uri: vscode.Uri): ZipFileReference {
+  if (!uri.authority) {
+    // Uri is malformed, but this is recoverable
+    void logger.log(`Warning: ${new InvalidSourceArchiveUriError(uri).message}`);
+    return {
+      pathWithinSourceArchive: '/',
+      sourceArchiveZipPath: uri.path
+    };
+  }
   const match = sourceArchiveUriAuthorityPattern.exec(uri.authority);
   if (match === null)
     throw new InvalidSourceArchiveUriError(uri);
@@ -108,7 +129,7 @@ export function decodeSourceArchiveUri(uri: vscode.Uri): ZipFileReference {
   if (isNaN(zipPathStartIndex) || isNaN(zipPathEndIndex))
     throw new InvalidSourceArchiveUriError(uri);
   return {
-    pathWithinSourceArchive: uri.path.substring(zipPathEndIndex),
+    pathWithinSourceArchive: uri.path.substring(zipPathEndIndex) || '/',
     sourceArchiveZipPath: uri.path.substring(zipPathStartIndex, zipPathEndIndex),
   };
 }
@@ -120,7 +141,7 @@ function ensureFile(map: DirectoryHierarchyMap, file: string) {
   const dirname = path.dirname(file);
   if (dirname === '.') {
     const error = `Ill-formed path ${file} in zip archive (expected absolute path)`;
-    logger.log(error);
+    void logger.log(error);
     throw new Error(error);
   }
   ensureDir(map, dirname);
@@ -173,7 +194,7 @@ export class ArchiveFileSystemProvider implements vscode.FileSystemProvider {
     const ref = decodeSourceArchiveUri(uri);
     const archive = await this.getArchive(ref.sourceArchiveZipPath);
     const contents = archive.dirMap.get(ref.pathWithinSourceArchive);
-    const result = contents === undefined ? [] : Array.from(contents.entries());
+    const result = contents === undefined ? undefined : Array.from(contents.entries());
     if (result === undefined) {
       throw vscode.FileSystemError.FileNotFound(uri);
     }
@@ -238,7 +259,7 @@ export class ArchiveFileSystemProvider implements vscode.FileSystemProvider {
     if (archive.dirMap.has(reqPath)) {
       return new Directory(reqPath);
     }
-    throw vscode.FileSystemError.FileNotFound(uri);
+    throw vscode.FileSystemError.FileNotFound(`uri '${uri.toString()}', interpreted as '${reqPath}' in archive '${ref.sourceArchiveZipPath}'`);
   }
 
   private async _lookupAsFile(uri: vscode.Uri): Promise<File> {

extensions/ql-vscode/src/astViewer.ts

@@ -0,0 +1,204 @@
+import {
+  window,
+  TreeDataProvider,
+  EventEmitter,
+  Event,
+  ProviderResult,
+  TreeItemCollapsibleState,
+  TreeItem,
+  TreeView,
+  TextEditorSelectionChangeEvent,
+  TextEditorSelectionChangeKind,
+  Location,
+  Range
+} from 'vscode';
+import * as path from 'path';
+
+import { DatabaseItem } from './databases';
+import { UrlValue, BqrsId } from './pure/bqrs-cli-types';
+import { showLocation } from './interface-utils';
+import { isStringLoc, isWholeFileLoc, isLineColumnLoc } from './pure/bqrs-utils';
+import { commandRunner } from './commandRunner';
+import { DisposableObject } from './pure/disposable-object';
+import { showAndLogErrorMessage } from './helpers';
+
+export interface AstItem {
+  id: BqrsId;
+  label?: string;
+  location?: UrlValue;
+  fileLocation?: Location;
+  children: ChildAstItem[];
+  order: number;
+}
+
+export interface ChildAstItem extends AstItem {
+  parent: ChildAstItem | AstItem;
+}
+
+class AstViewerDataProvider extends DisposableObject implements TreeDataProvider<AstItem> {
+
+  public roots: AstItem[] = [];
+  public db: DatabaseItem | undefined;
+
+  private _onDidChangeTreeData =
+    this.push(new EventEmitter<AstItem | undefined>());
+  readonly onDidChangeTreeData: Event<AstItem | undefined> =
+    this._onDidChangeTreeData.event;
+
+  constructor() {
+    super();
+    this.push(
+      commandRunner('codeQLAstViewer.gotoCode',
+        async (item: AstItem) => {
+          await showLocation(item.fileLocation);
+        })
+    );
+  }
+
+  refresh(): void {
+    this._onDidChangeTreeData.fire(undefined);
+  }
+  getChildren(item?: AstItem): ProviderResult<AstItem[]> {
+    const children = item ? item.children : this.roots;
+    return children.sort((c1, c2) => (c1.order - c2.order));
+  }
+
+  getParent(item: ChildAstItem): ProviderResult<AstItem> {
+    return item.parent;
+  }
+
+  getTreeItem(item: AstItem): TreeItem {
+    const line = this.extractLineInfo(item?.location);
+
+    const state = item.children.length
+      ? TreeItemCollapsibleState.Collapsed
+      : TreeItemCollapsibleState.None;
+    const treeItem = new TreeItem(item.label || '', state);
+    treeItem.description = line ? `Line ${line}` : '';
+    treeItem.id = String(item.id);
+    treeItem.tooltip = `${treeItem.description} ${treeItem.label}`;
+    treeItem.command = {
+      command: 'codeQLAstViewer.gotoCode',
+      title: 'Go To Code',
+      tooltip: `Go To ${item.location}`,
+      arguments: [item]
+    };
+    return treeItem;
+  }
+
+  private extractLineInfo(loc?: UrlValue) {
+    if (!loc) {
+      return '';
+    } else if (isStringLoc(loc)) {
+      return loc;
+    } else if (isWholeFileLoc(loc)) {
+      return loc.uri;
+    } else if (isLineColumnLoc(loc)) {
+      return loc.startLine;
+    } else {
+      return '';
+    }
+  }
+}
+
+export class AstViewer extends DisposableObject {
+  private treeView: TreeView<AstItem>;
+  private treeDataProvider: AstViewerDataProvider;
+  private currentFile: string | undefined;
+
+  constructor() {
+    super();
+
+    this.treeDataProvider = new AstViewerDataProvider();
+    this.treeView = window.createTreeView('codeQLAstViewer', {
+      treeDataProvider: this.treeDataProvider,
+      showCollapseAll: true
+    });
+
+    this.push(this.treeView);
+    this.push(this.treeDataProvider);
+    this.push(
+      commandRunner('codeQLAstViewer.clear', async () => {
+        this.clear();
+      })
+    );
+    this.push(window.onDidChangeTextEditorSelection(this.updateTreeSelection, this));
+  }
+
+  updateRoots(roots: AstItem[], db: DatabaseItem, fileName: string) {
+    this.treeDataProvider.roots = roots;
+    this.treeDataProvider.db = db;
+    this.treeDataProvider.refresh();
+    this.treeView.message = `AST for ${path.basename(fileName)}`;
+    this.currentFile = fileName;
+    // Handle error on reveal. This could happen if
+    // the tree view is disposed during the reveal.
+    this.treeView.reveal(roots[0], { focus: false })?.then(
+      () => { /**/ },
+      err => showAndLogErrorMessage(err)
+    );
+  }
+
+  private updateTreeSelection(e: TextEditorSelectionChangeEvent) {
+    function isInside(selectedRange: Range, astRange?: Range): boolean {
+      return !!astRange?.contains(selectedRange);
+    }
+
+    // Recursively iterate all children until we find the node with the smallest
+    // range that contains the selection.
+    // Some nodes do not have a location, but their children might, so must
+    // recurse though location-less AST nodes to see if children are correct.
+    function findBest(selectedRange: Range, items?: AstItem[]): AstItem | undefined {
+      if (!items || !items.length) {
+        return;
+      }
+      for (const item of items) {
+        let candidate: AstItem | undefined = undefined;
+        if (isInside(selectedRange, item.fileLocation?.range)) {
+          candidate = item;
+        }
+        // always iterate through children since the location of an AST node in code QL does not
+        // always cover the complete text of the node.
+        candidate = findBest(selectedRange, item.children) || candidate;
+        if (candidate) {
+          return candidate;
+        }
+      }
+      return;
+    }
+
+    // Avoid recursive tree-source code updates.
+    if (e.kind === TextEditorSelectionChangeKind.Command) {
+      return;
+    }
+
+    if (
+      this.treeView.visible &&
+      e.textEditor.document.uri.fsPath === this.currentFile &&
+      e.selections.length === 1
+    ) {
+      const selection = e.selections[0];
+      const range = selection.anchor.isBefore(selection.active)
+        ? new Range(selection.anchor, selection.active)
+        : new Range(selection.active, selection.anchor);
+
+      const targetItem = findBest(range, this.treeDataProvider.roots);
+      if (targetItem) {
+        // Handle error on reveal. This could happen if
+        // the tree view is disposed during the reveal.
+        this.treeView.reveal(targetItem)?.then(
+          () => { /**/ },
+          err => showAndLogErrorMessage(err)
+        );
+      }
+    }
+  }
+
+  private clear() {
+    this.treeDataProvider.roots = [];
+    this.treeDataProvider.db = undefined;
+    this.treeDataProvider.refresh();
+    this.treeView.message = undefined;
+    this.currentFile = undefined;
+  }
+}

extensions/ql-vscode/src/authentication.ts

@@ -0,0 +1,62 @@
+import * as vscode from 'vscode';
+import * as Octokit from '@octokit/rest';
+
+const GITHUB_AUTH_PROVIDER_ID = 'github';
+
+// 'repo' scope should be enough for triggering workflows. For a comprehensive list, see:
+// https://docs.github.com/apps/building-oauth-apps/understanding-scopes-for-oauth-apps
+const SCOPES = ['repo'];
+
+/** 
+ * Handles authentication to GitHub, using the VS Code [authentication API](https://code.visualstudio.com/api/references/vscode-api#authentication).
+ */
+export class Credentials {
+  private octokit: Octokit.Octokit | undefined;
+
+  // Explicitly make the constructor private, so that we can't accidentally call the constructor from outside the class
+  // without also initializing the class.
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
+  private constructor() { }
+
+  static async initialize(context: vscode.ExtensionContext): Promise<Credentials> {
+    const c = new Credentials();
+    c.registerListeners(context);
+    c.octokit = await c.createOctokit(false);
+    return c;
+  }
+
+  private async createOctokit(createIfNone: boolean): Promise<Octokit.Octokit | undefined> {
+    const session = await vscode.authentication.getSession(GITHUB_AUTH_PROVIDER_ID, SCOPES, { createIfNone });
+
+    if (session) {
+      return new Octokit.Octokit({
+        auth: session.accessToken
+      });
+    } else {
+      return undefined;
+    }
+  }
+
+  registerListeners(context: vscode.ExtensionContext): void {
+    // Sessions are changed when a user logs in or logs out.
+    context.subscriptions.push(vscode.authentication.onDidChangeSessions(async e => {
+      if (e.provider.id === GITHUB_AUTH_PROVIDER_ID) {
+        this.octokit = await this.createOctokit(false);
+      }
+    }));
+  }
+
+  async getOctokit(): Promise<Octokit.Octokit> {
+    if (this.octokit) {
+      return this.octokit;
+    }
+
+    this.octokit = await this.createOctokit(true);
+    // octokit shouldn't be undefined, since we've set "createIfNone: true".
+    // The following block is mainly here to prevent a compiler error.
+    if (!this.octokit) {
+      throw new Error('Did not initialize Octokit.');
+    }
+    return this.octokit;
+  }
+}

extensions/ql-vscode/src/bqrs-cli-types.ts

@@ -1,79 +0,0 @@
-
-export const PAGE_SIZE = 1000;
-
-export type ColumnKind = "f" | "i" | "s" | "b" | "d" | "e";
-
-export interface Column {
-  name?: string;
-  kind: ColumnKind;
-}
-
-
-export interface ResultSetSchema {
-  name: string;
-  rows: number;
-  columns: Column[];
-  pagination?: PaginationInfo;
-}
-
-export function getResultSetSchema(resultSetName: string, resultSets: BQRSInfo): ResultSetSchema | undefined {
-  for (const schema of resultSets["result-sets"]) {
-    if (schema.name === resultSetName) {
-      return schema;
-    }
-  }
-  return undefined;
-}
-export interface PaginationInfo {
-  "step-size": number;
-  offsets: number[];
-}
-
-export interface BQRSInfo {
-  "result-sets": ResultSetSchema[];
-}
-
-export interface EntityValue {
-  url?: UrlValue;
-  label?: string;
-}
-
-export interface LineColumnLocation {
-  uri: string;
-  startLine: number;
-  startColumn: number;
-  endLine: number;
-  endColumn: number;
-  charOffset: never;
-  charLength: never;
-}
-
-export interface OffsetLengthLocation {
-  uri: string;
-  startLine: never;
-  startColumn: never;
-  endLine: never;
-  endColumn: never;
-  charOffset: number;
-  charLength: number;
-}
-
-export interface WholeFileLocation {
-  uri: string;
-  startLine: never;
-  startColumn: never;
-  endLine: never;
-  endColumn: never;
-  charOffset: never;
-  charLength: never;
-}
-
-export type UrlValue = LineColumnLocation | OffsetLengthLocation | WholeFileLocation | string;
-
-
-export type ColumnValue = EntityValue | number | string | boolean;
-
-export interface DecodedBqrsChunk {
-  tuples: ColumnValue[][];
-  next?: number;
-}

extensions/ql-vscode/src/cli-version.ts

@@ -1,96 +1,24 @@
-import { runCodeQlCliCommand } from "./cli";
-import { Logger } from "./logging";
+import * as semver from 'semver';
+import { runCodeQlCliCommand } from './cli';
+import { Logger } from './logging';
 
 /**
  * Get the version of a CodeQL CLI.
  */
-export async function getCodeQlCliVersion(codeQlPath: string, logger: Logger): Promise<Version | undefined> {
-  const output: string = await runCodeQlCliCommand(
-    codeQlPath,
-    ["version"],
-    ["--format=terse"],
-    "Checking CodeQL version",
-    logger
-  );
-  return tryParseVersionString(output.trim());
-}
-
-/**
- * Try to parse a version string, returning undefined if we can't parse it.
- * 
- * Version strings must contain a major, minor, and patch version.  They may optionally
- * start with "v" and may optionally contain some "tail" string after the major, minor, and
- * patch versions, for example as in `v2.1.0+baf5bff`.
- */
-export function tryParseVersionString(versionString: string): Version | undefined {
-  const match = versionString.match(versionRegex);
-  if (match === null) {
+export async function getCodeQlCliVersion(codeQlPath: string, logger: Logger): Promise<semver.SemVer | undefined> {
+  try {
+    const output: string = await runCodeQlCliCommand(
+      codeQlPath,
+      ['version'],
+      ['--format=terse'],
+      'Checking CodeQL version',
+      logger
+    );
+    return semver.parse(output.trim()) || undefined;
+  } catch (e) {
+    // Failed to run the version command. This might happen if the cli version is _really_ old, or it is corrupted.
+    // Either way, we can't determine compatibility.
+    void logger.log(`Failed to run 'codeql version'. Reason: ${e.message}`);
     return undefined;
   }
-  return {
-    buildMetadata: match[5],
-    majorVersion: Number.parseInt(match[1], 10),
-    minorVersion: Number.parseInt(match[2], 10),
-    patchVersion: Number.parseInt(match[3], 10),
-    prereleaseVersion: match[4],
-    rawString: versionString,
-  }
-}
-
-/**
- * Regex for parsing semantic versions
- * 
- * From the semver spec https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
- */
-const versionRegex = new RegExp(String.raw`^v?(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)` +
-  String.raw`(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?` +
-  String.raw`(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$`);
-
-/**
- * A version of the CodeQL CLI.
- */
-export interface Version {
-  /**
-   * Build metadata
-   * 
-   * For example, this will be `abcdef0` for version 2.1.0-alpha.1+abcdef0.
-   * Build metadata must be ignored when comparing versions. 
-   */
-  buildMetadata: string | undefined;
-
-  /**
-   * Major version number
-   * 
-   * For example, this will be `2` for version 2.1.0-alpha.1+abcdef0.
-   */
-  majorVersion: number;
-
-  /**
-   * Minor version number
-   * 
-   * For example, this will be `1` for version 2.1.0-alpha.1+abcdef0.
-   */
-  minorVersion: number;
-
-  /**
-   * Patch version number
-   * 
-   * For example, this will be `0` for version 2.1.0-alpha.1+abcdef0.
-   */
-  patchVersion: number;
-
-  /**
-   * Prerelease version
-   * 
-   * For example, this will be `alpha.1` for version 2.1.0-alpha.1+abcdef0.
-   * The prerelease version must be considered when comparing versions.
-   */
-  prereleaseVersion: string | undefined;
-
-  /**
-   * Raw version string
-   * 
-   * For example, this will be `2.1.0-alpha.1+abcdef0` for version 2.1.0-alpha.1+abcdef0.
-   */
-  rawString: string;
 }

extensions/ql-vscode/src/cli.ts

@@ -1,24 +1,32 @@
-/* eslint-disable @typescript-eslint/camelcase */
 import * as cpp from 'child-process-promise';
 import * as child_process from 'child_process';
 import * as fs from 'fs-extra';
 import * as path from 'path';
 import * as sarif from 'sarif';
+import { SemVer } from 'semver';
 import { Readable } from 'stream';
 import { StringDecoder } from 'string_decoder';
 import * as tk from 'tree-kill';
-import * as util from 'util';
-import { CancellationToken, Disposable } from 'vscode';
-import { BQRSInfo, DecodedBqrsChunk } from "./bqrs-cli-types";
-import { DistributionProvider } from './distribution';
-import { assertNever } from './helpers-pure';
-import { QueryMetadata, SortDirection } from './interface-types';
+import { promisify } from 'util';
+import { CancellationToken, Disposable, Uri } from 'vscode';
+
+import { BQRSInfo, DecodedBqrsChunk } from './pure/bqrs-cli-types';
+import { CliConfig } from './config';
+import { DistributionProvider, FindDistributionResultKind } from './distribution';
+import { assertNever } from './pure/helpers-pure';
+import { QueryMetadata, SortDirection } from './pure/interface-types';
 import { Logger, ProgressReporter } from './logging';
+import { CompilationMessage } from './pure/messages';
 
 /**
  * The version of the SARIF format that we are using.
  */
-const SARIF_FORMAT = "sarifv2.1.0";
+const SARIF_FORMAT = 'sarifv2.1.0';
+
+/**
+ * The string used to specify CSV format.
+ */
+const CSV_FORMAT = 'csv';
 
 /**
  * Flags to pass to all cli commands.
@@ -35,6 +43,16 @@ export interface QuerySetup {
   compilationCache?: string;
 }
 
+/**
+ * The expected output of `codeql resolve queries --format bylanguage`.
+ */
+export interface QueryInfoByLanguage {
+  // Using `unknown` as a placeholder. For now, the value is only ever an empty object.
+  byLanguage: Record<string, Record<string, unknown>>;
+  noDeclaredLanguage: Record<string, unknown>;
+  multipleDeclaredLanguages: Record<string, unknown>;
+}
+
 /**
  * The expected output of `codeql resolve database`.
  */
@@ -46,6 +64,7 @@ export interface DbInfo {
   sourceArchiveRoot: string;
   datasetFolder: string;
   logsFolder: string;
+  languages: string[];
 }
 
 /**
@@ -54,6 +73,7 @@ export interface DbInfo {
 export interface UpgradesInfo {
   scripts: string[];
   finalDbscheme: string;
+  matchesTarget?: boolean;
 }
 
 /**
@@ -61,6 +81,16 @@ export interface UpgradesInfo {
  */
 export type QlpacksInfo = { [name: string]: string[] };
 
+/**
+ * The expected output of `codeql resolve languages`.
+ */
+export type LanguagesInfo = { [name: string]: string[] };
+
+/**
+ * The expected output of `codeql resolve qlref`.
+ */
+export type QlrefInfo = { resolvedPath: string };
+
 // `codeql bqrs interpret` requires both of these to be present or
 // both absent.
 export interface SourceInfo {
@@ -87,10 +117,25 @@ export interface TestRunOptions {
 export interface TestCompleted {
   test: string;
   pass: boolean;
-  messages: string[];
+  messages: CompilationMessage[];
   compilationMs: number;
   evaluationMs: number;
   expected: string;
+  diff: string[] | undefined;
+  failureDescription?: string;
+  failureStage?: string;
+}
+
+/**
+ * Optional arguments for the `bqrsDecode` function
+ */
+interface BqrsDecodeOptions {
+  /** How many results to get. */
+  pageSize?: number;
+  /** The 0-based index of the first result to get. */
+  offset?: number;
+  /** The entity names to retrieve from the bqrs file. Default is url, string */
+  entities?: string[];
 }
 
 /**
@@ -101,6 +146,7 @@ export interface TestCompleted {
  */
 export class CodeQLCliServer implements Disposable {
 
+
   /** The process for the cli server, or undefined if one doesn't exist yet */
   process?: child_process.ChildProcessWithoutNullStreams;
   /** Queue of future commands*/
@@ -110,18 +156,41 @@ export class CodeQLCliServer implements Disposable {
   /**  A buffer with a single null byte. */
   nullBuffer: Buffer;
 
-  constructor(private config: DistributionProvider, private logger: Logger) {
+  /** Version of current cli, lazily computed by the `getVersion()` method */
+  private _version: SemVer | undefined;
+
+  /** Path to current codeQL executable, or undefined if not running yet. */
+  codeQlPath: string | undefined;
+
+  cliConstraints = new CliVersionConstraint(this);
+
+  /**
+   * When set to true, ignore some modal popups and assume user has clicked "yes".
+   */
+  public quiet = false;
+
+  constructor(
+    private distributionProvider: DistributionProvider,
+    private cliConfig: CliConfig,
+    private logger: Logger
+  ) {
     this.commandQueue = [];
     this.commandInProcess = false;
     this.nullBuffer = Buffer.alloc(1);
-    if (this.config.onDidChangeDistribution) {
-      this.config.onDidChangeDistribution(() => {
+    if (this.distributionProvider.onDidChangeDistribution) {
+      this.distributionProvider.onDidChangeDistribution(() => {
         this.restartCliServer();
+        this._version = undefined;
+      });
+    }
+    if (this.cliConfig.onDidChangeConfiguration) {
+      this.cliConfig.onDidChangeConfiguration(() => {
+        this.restartCliServer();
+        this._version = undefined;
       });
     }
   }
 
-
   dispose(): void {
     this.killProcessIfRunning();
   }
@@ -129,15 +198,15 @@ export class CodeQLCliServer implements Disposable {
   killProcessIfRunning(): void {
     if (this.process) {
       // Tell the Java CLI server process to shut down.
-      this.logger.log('Sending shutdown request');
+      void this.logger.log('Sending shutdown request');
       try {
-        this.process.stdin.write(JSON.stringify(["shutdown"]), "utf8");
+        this.process.stdin.write(JSON.stringify(['shutdown']), 'utf8');
         this.process.stdin.write(this.nullBuffer);
-        this.logger.log('Sent shutdown request');
+        void this.logger.log('Sent shutdown request');
       } catch (e) {
         // We are probably fine here, the process has already closed stdin.
-        this.logger.log(`Shutdown request failed: process stdin may have already closed. The error was ${e}`);
-        this.logger.log('Stopping the process anyway.');
+        void this.logger.log(`Shutdown request failed: process stdin may have already closed. The error was ${e}`);
+        void this.logger.log('Stopping the process anyway.');
       }
       // Close the stdin and stdout streams.
       // This is important on Windows where the child process may not die cleanly.
@@ -165,7 +234,7 @@ export class CodeQLCliServer implements Disposable {
     // If the server is not running a command run this immediately
     // otherwise add to the front of the queue (as we want to run this after the next command()).
     if (this.commandInProcess) {
-      this.commandQueue.unshift(callback)
+      this.commandQueue.unshift(callback);
     } else {
       callback();
     }
@@ -176,7 +245,7 @@ export class CodeQLCliServer implements Disposable {
    * Get the path to the CodeQL CLI distribution, or throw an exception if not found.
    */
   private async getCodeQlPath(): Promise<string> {
-    const codeqlPath = await this.config.getCodeQlPathWithoutVersionCheck();
+    const codeqlPath = await this.distributionProvider.getCodeQlPathWithoutVersionCheck();
     if (!codeqlPath) {
       throw new Error('Failed to find CodeQL distribution.');
     }
@@ -187,20 +256,27 @@ export class CodeQLCliServer implements Disposable {
    * Launch the cli server
    */
   private async launchProcess(): Promise<child_process.ChildProcessWithoutNullStreams> {
-    const config = await this.getCodeQlPath();
-    return spawnServer(config, "CodeQL CLI Server", ["execute", "cli-server"], [], this.logger, _data => { /**/ })
+    const codeQlPath = await this.getCodeQlPath();
+    return await spawnServer(
+      codeQlPath,
+      'CodeQL CLI Server',
+      ['execute', 'cli-server'],
+      [],
+      this.logger,
+      _data => { /**/ }
+    );
   }
 
   private async runCodeQlCliInternal(command: string[], commandArgs: string[], description: string): Promise<string> {
     const stderrBuffers: Buffer[] = [];
     if (this.commandInProcess) {
-      throw new Error("runCodeQlCliInternal called while cli was running")
+      throw new Error('runCodeQlCliInternal called while cli was running');
     }
     this.commandInProcess = true;
     try {
       //Launch the process if it doesn't exist
       if (!this.process) {
-        this.process = await this.launchProcess()
+        this.process = await this.launchProcess();
       }
       // Grab the process so that typescript know that it is always defined.
       const process = this.process;
@@ -209,10 +285,10 @@ export class CodeQLCliServer implements Disposable {
 
       // Compute the full args array
       const args = command.concat(LOGGING_FLAGS).concat(commandArgs);
-      const argsString = args.join(" ");
-      this.logger.log(`${description} using CodeQL CLI: ${argsString}...`);
+      const argsString = args.join(' ');
+      void this.logger.log(`${description} using CodeQL CLI: ${argsString}...`);
       try {
-        await new Promise((resolve, reject) => {
+        await new Promise<void>((resolve, reject) => {
           // Start listening to stdout
           process.stdout.addListener('data', (newData: Buffer) => {
             stdoutBuffers.push(newData);
@@ -228,16 +304,16 @@ export class CodeQLCliServer implements Disposable {
             stderrBuffers.push(newData);
           });
           // Listen for process exit.
-          process.addListener("close", (code) => reject(code));
+          process.addListener('close', (code) => reject(code));
           // Write the command followed by a null terminator.
-          process.stdin.write(JSON.stringify(args), "utf8")
-          process.stdin.write(this.nullBuffer)
+          process.stdin.write(JSON.stringify(args), 'utf8');
+          process.stdin.write(this.nullBuffer);
         });
         // Join all the data together
         const fullBuffer = Buffer.concat(stdoutBuffers);
         // Make sure we remove the terminator;
-        const data = fullBuffer.toString("utf8", 0, fullBuffer.length - 1);
-        this.logger.log(`CLI command succeeded.`);
+        const data = fullBuffer.toString('utf8', 0, fullBuffer.length - 1);
+        void this.logger.log('CLI command succeeded.');
         return data;
       } catch (err) {
         // Kill the process if it isn't already dead.
@@ -246,15 +322,15 @@ export class CodeQLCliServer implements Disposable {
         const newError =
           stderrBuffers.length == 0
             ? new Error(`${description} failed: ${err}`)
-            : new Error(`${description} failed: ${Buffer.concat(stderrBuffers).toString("utf8")}`);
+            : new Error(`${description} failed: ${Buffer.concat(stderrBuffers).toString('utf8')}`);
         newError.stack += (err.stack || '');
         throw newError;
       } finally {
-        this.logger.log(Buffer.concat(stderrBuffers).toString("utf8"));
+        void this.logger.log(Buffer.concat(stderrBuffers).toString('utf8'));
         // Remove the listeners we set up.
-        process.stdout.removeAllListeners('data')
-        process.stderr.removeAllListeners('data')
-        process.removeAllListeners("close");
+        process.stdout.removeAllListeners('data');
+        process.stderr.removeAllListeners('data');
+        process.removeAllListeners('close');
       }
     } finally {
       this.commandInProcess = false;
@@ -310,7 +386,7 @@ export class CodeQLCliServer implements Disposable {
       }
       if (logger !== undefined) {
         // The human-readable output goes to stderr.
-        logStream(child.stderr!, logger);
+        void logStream(child.stderr!, logger);
       }
 
       for await (const event of await splitStreamAtSeparators(child.stdout!, ['\0'])) {
@@ -349,7 +425,7 @@ export class CodeQLCliServer implements Disposable {
       try {
         yield JSON.parse(event) as EventType;
       } catch (err) {
-        throw new Error(`Parsing output of ${description} failed: ${err.stderr || err}`)
+        throw new Error(`Parsing output of ${description} failed: ${err.stderr || err}`);
       }
     }
   }
@@ -375,11 +451,11 @@ export class CodeQLCliServer implements Disposable {
         } catch (err) {
           reject(err);
         }
-      }
+      };
       // If the server is not running a command, then run the given command immediately,
       // otherwise add to the queue
       if (this.commandInProcess) {
-        this.commandQueue.push(callback)
+        this.commandQueue.push(callback);
       } else {
         callback();
       }
@@ -391,17 +467,20 @@ export class CodeQLCliServer implements Disposable {
    * @param command The `codeql` command to be run, provided as an array of command/subcommand names.
    * @param commandArgs The arguments to pass to the `codeql` command.
    * @param description Description of the action being run, to be shown in log and error messages.
+   * @param addFormat Whether or not to add commandline arguments to specify the format as JSON.
    * @param progressReporter Used to output progress messages, e.g. to the status bar.
    * @returns The contents of the command's stdout, if the command succeeded.
    */
-  async runJsonCodeQlCliCommand<OutputType>(command: string[], commandArgs: string[], description: string, progressReporter?: ProgressReporter): Promise<OutputType> {
-    // Add format argument first, in case commandArgs contains positional parameters.
-    const args = ['--format', 'json'].concat(commandArgs);
+  async runJsonCodeQlCliCommand<OutputType>(command: string[], commandArgs: string[], description: string, addFormat = true, progressReporter?: ProgressReporter): Promise<OutputType> {
+    let args: string[] = [];
+    if (addFormat) // Add format argument first, in case commandArgs contains positional parameters.
+      args = args.concat(['--format', 'json']);
+    args = args.concat(commandArgs);
     const result = await this.runCodeQlCliCommand(command, args, description, progressReporter);
     try {
       return JSON.parse(result) as OutputType;
     } catch (err) {
-      throw new Error(`Parsing output of ${description} failed: ${err.stderr || err}`)
+      throw new Error(`Parsing output of ${description} failed: ${err.stderr || err}`);
     }
   }
 
@@ -413,10 +492,24 @@ export class CodeQLCliServer implements Disposable {
   async resolveLibraryPath(workspaces: string[], queryPath: string): Promise<QuerySetup> {
     const subcommandArgs = [
       '--query', queryPath,
-      "--additional-packs",
+      '--additional-packs',
       workspaces.join(path.delimiter)
     ];
-    return await this.runJsonCodeQlCliCommand<QuerySetup>(['resolve', 'library-path'], subcommandArgs, "Resolving library paths");
+    return await this.runJsonCodeQlCliCommand<QuerySetup>(['resolve', 'library-path'], subcommandArgs, 'Resolving library paths');
+  }
+
+  /**
+   * Resolves the language for a query.
+   * @param queryUri The URI of the query
+   */
+  async resolveQueryByLanguage(workspaces: string[], queryUri: Uri): Promise<QueryInfoByLanguage> {
+    const subcommandArgs = [
+      '--format', 'bylanguage',
+      queryUri.fsPath,
+      '--additional-packs',
+      workspaces.join(path.delimiter)
+    ];
+    return JSON.parse(await this.runCodeQlCliCommand(['resolve', 'queries'], subcommandArgs, 'Resolving query by language'));
   }
 
   /**
@@ -428,7 +521,23 @@ export class CodeQLCliServer implements Disposable {
     const subcommandArgs = [
       testPath
     ];
-    return await this.runJsonCodeQlCliCommand<ResolvedTests>(['resolve', 'tests'], subcommandArgs, 'Resolving tests');
+    return await this.runJsonCodeQlCliCommand<ResolvedTests>(
+      ['resolve', 'tests', '--strict-test-discovery'],
+      subcommandArgs,
+      'Resolving tests'
+    );
+  }
+
+  public async resolveQlref(qlref: string): Promise<QlrefInfo> {
+    const subcommandArgs = [
+      qlref
+    ];
+    return await this.runJsonCodeQlCliCommand<QlrefInfo>(
+      ['resolve', 'qlref'],
+      subcommandArgs,
+      'Resolving qlref',
+      false
+    );
   }
 
   /**
@@ -441,11 +550,12 @@ export class CodeQLCliServer implements Disposable {
     testPaths: string[], workspaces: string[], options: TestRunOptions
   ): AsyncGenerator<TestCompleted, void, unknown> {
 
-    const subcommandArgs = [
+    const subcommandArgs = this.cliConfig.additionalTestArguments.concat([
       '--additional-packs', workspaces.join(path.delimiter),
-      '--threads', '8',
+      '--threads',
+      this.cliConfig.numberTestThreads.toString(),
       ...testPaths
-    ];
+    ]);
 
     for await (const event of await this.runAsyncCodeQlCliCommand<TestCompleted>(['test', 'run'],
       subcommandArgs, 'Run CodeQL Tests', options.cancellationToken, options.logger)) {
@@ -458,7 +568,7 @@ export class CodeQLCliServer implements Disposable {
    * @param queryPath The path to the query.
    */
   async resolveMetadata(queryPath: string): Promise<QueryMetadata> {
-    return await this.runJsonCodeQlCliCommand<QueryMetadata>(['resolve', 'metadata'], [queryPath], "Resolving query metadata");
+    return await this.runJsonCodeQlCliCommand<QueryMetadata>(['resolve', 'metadata'], [queryPath], 'Resolving query metadata');
   }
 
   /**
@@ -474,7 +584,7 @@ export class CodeQLCliServer implements Disposable {
     if (queryMemoryMb !== undefined) {
       args.push('--ram', queryMemoryMb.toString());
     }
-    return await this.runJsonCodeQlCliCommand<string[]>(['resolve', 'ram'], args, "Resolving RAM settings", progressReporter);
+    return await this.runJsonCodeQlCliCommand<string[]>(['resolve', 'ram'], args, 'Resolving RAM settings', true, progressReporter);
   }
   /**
    * Gets the headers (and optionally pagination info) of a bqrs.
@@ -483,75 +593,102 @@ export class CodeQLCliServer implements Disposable {
    */
   async bqrsInfo(bqrsPath: string, pageSize?: number): Promise<BQRSInfo> {
     const subcommandArgs = (
-      pageSize ? ["--paginate-rows", pageSize.toString()] : []
+      pageSize ? ['--paginate-rows', pageSize.toString()] : []
     ).concat(
       bqrsPath
     );
-    return await this.runJsonCodeQlCliCommand<BQRSInfo>(['bqrs', 'info'], subcommandArgs, "Reading bqrs header");
+    return await this.runJsonCodeQlCliCommand<BQRSInfo>(['bqrs', 'info'], subcommandArgs, 'Reading bqrs header');
   }
 
   /**
   * Gets the results from a bqrs.
   * @param bqrsPath The path to the bqrs.
   * @param resultSet The result set to get.
-  * @param pageSize How many results to get.
-  * @param offset The 0-based index of the first result to get.
+  * @param options Optional BqrsDecodeOptions arguments
   */
-  async bqrsDecode(bqrsPath: string, resultSet: string, pageSize?: number, offset?: number): Promise<DecodedBqrsChunk> {
+  async bqrsDecode(
+    bqrsPath: string,
+    resultSet: string,
+    { pageSize, offset, entities = ['url', 'string'] }: BqrsDecodeOptions = {}
+  ): Promise<DecodedBqrsChunk> {
+
     const subcommandArgs = [
-      "--entities=url,string",
-      "--result-set", resultSet,
+      `--entities=${entities.join(',')}`,
+      '--result-set', resultSet,
     ].concat(
-      pageSize ? ["--rows", pageSize.toString()] : []
+      pageSize ? ['--rows', pageSize.toString()] : []
     ).concat(
-      offset ? ["--start-at", offset.toString()] : []
+      offset ? ['--start-at', offset.toString()] : []
     ).concat([bqrsPath]);
-    return await this.runJsonCodeQlCliCommand<DecodedBqrsChunk>(['bqrs', 'decode'], subcommandArgs, "Reading bqrs data");
+    return await this.runJsonCodeQlCliCommand<DecodedBqrsChunk>(['bqrs', 'decode'], subcommandArgs, 'Reading bqrs data');
   }
 
-
-  async interpretBqrs(metadata: { kind: string; id: string }, resultsPath: string, interpretedResultsPath: string, sourceInfo?: SourceInfo): Promise<sarif.Log> {
+  async runInterpretCommand(format: string, metadata: QueryMetadata, resultsPath: string, interpretedResultsPath: string, sourceInfo?: SourceInfo) {
     const args = [
-      `-t=kind=${metadata.kind}`,
-      `-t=id=${metadata.id}`,
-      "--output", interpretedResultsPath,
-      "--format", SARIF_FORMAT,
+      '--output', interpretedResultsPath,
+      '--format', format,
+      // Forward all of the query metadata.
+      ...Object.entries(metadata).map(([key, value]) => `-t=${key}=${value}`)
+    ];
+    if (format == SARIF_FORMAT) {
       // TODO: This flag means that we don't group interpreted results
       // by primary location. We may want to revisit whether we call
       // interpretation with and without this flag, or do some
       // grouping client-side.
-      "--no-group-results",
-    ];
+      args.push('--no-group-results');
+    }
     if (sourceInfo !== undefined) {
       args.push(
-        "--source-archive", sourceInfo.sourceArchive,
-        "--source-location-prefix", sourceInfo.sourceLocationPrefix
+        '--source-archive', sourceInfo.sourceArchive,
+        '--source-location-prefix', sourceInfo.sourceLocationPrefix
       );
     }
+
+    args.push(
+      '--threads',
+      this.cliConfig.numberThreads.toString(),
+    );
+
+    args.push(
+      '--max-paths',
+      this.cliConfig.maxPaths.toString(),
+    );
+
     args.push(resultsPath);
-    await this.runCodeQlCliCommand(['bqrs', 'interpret'], args, "Interpreting query results");
+    await this.runCodeQlCliCommand(['bqrs', 'interpret'], args, 'Interpreting query results');
+  }
+
+  async interpretBqrs(metadata: QueryMetadata, resultsPath: string, interpretedResultsPath: string, sourceInfo?: SourceInfo): Promise<sarif.Log> {
+    await this.runInterpretCommand(SARIF_FORMAT, metadata, resultsPath, interpretedResultsPath, sourceInfo);
 
     let output: string;
     try {
       output = await fs.readFile(interpretedResultsPath, 'utf8');
-    } catch (err) {
-      throw new Error(`Reading output of interpretation failed: ${err.stderr || err}`)
+    } catch (e) {
+      const rawMessage = e.stderr || e.message;
+      const errorMessage = rawMessage.startsWith('Cannot create a string')
+        ? `SARIF too large. ${rawMessage}`
+        : rawMessage;
+      throw new Error(`Reading output of interpretation failed: ${errorMessage}`);
     }
     try {
       return JSON.parse(output) as sarif.Log;
     } catch (err) {
-      throw new Error(`Parsing output of interpretation failed: ${err.stderr || err}`)
+      throw new Error(`Parsing output of interpretation failed: ${err.stderr || err}`);
     }
   }
 
+  async generateResultsCsv(metadata: QueryMetadata, resultsPath: string, csvPath: string, sourceInfo?: SourceInfo): Promise<void> {
+    await this.runInterpretCommand(CSV_FORMAT, metadata, resultsPath, csvPath, sourceInfo);
+  }
 
   async sortBqrs(resultsPath: string, sortedResultsPath: string, resultSet: string, sortKeys: number[], sortDirections: SortDirection[]): Promise<void> {
     const sortDirectionStrings = sortDirections.map(direction => {
       switch (direction) {
         case SortDirection.asc:
-          return "asc";
+          return 'asc';
         case SortDirection.desc:
-          return "desc";
+          return 'desc';
         default:
           return assertNever(direction);
       }
@@ -559,14 +696,14 @@ export class CodeQLCliServer implements Disposable {
 
     await this.runCodeQlCliCommand(['bqrs', 'decode'],
       [
-        "--format=bqrs",
+        '--format=bqrs',
         `--result-set=${resultSet}`,
         `--output=${sortedResultsPath}`,
-        `--sort-key=${sortKeys.join(",")}`,
-        `--sort-direction=${sortDirectionStrings.join(",")}`,
+        `--sort-key=${sortKeys.join(',')}`,
+        `--sort-direction=${sortDirectionStrings.join(',')}`,
         resultsPath
       ],
-      "Sorting query results");
+      'Sorting query results');
   }
 
 
@@ -576,22 +713,29 @@ export class CodeQLCliServer implements Disposable {
    */
   resolveDatabase(databasePath: string): Promise<DbInfo> {
     return this.runJsonCodeQlCliCommand(['resolve', 'database'], [databasePath],
-      "Resolving database");
+      'Resolving database');
   }
 
   /**
    * Gets information necessary for upgrading a database.
    * @param dbScheme the path to the dbscheme of the database to be upgraded.
    * @param searchPath A list of directories to search for upgrade scripts.
+   * @param allowDowngradesIfPossible Whether we should try and include downgrades of we can.
+   * @param targetDbScheme The dbscheme to try to upgrade to.
    * @returns A list of database upgrade script directories
    */
-  resolveUpgrades(dbScheme: string, searchPath: string[]): Promise<UpgradesInfo> {
+  async resolveUpgrades(dbScheme: string, searchPath: string[], allowDowngradesIfPossible: boolean, targetDbScheme?: string): Promise<UpgradesInfo> {
     const args = ['--additional-packs', searchPath.join(path.delimiter), '--dbscheme', dbScheme];
-
-    return this.runJsonCodeQlCliCommand<UpgradesInfo>(
+    if (targetDbScheme) {
+      args.push('--target-dbscheme', targetDbScheme);
+      if (allowDowngradesIfPossible && await this.cliConstraints.supportsDowngrades()) {
+        args.push('--allow-downgrades');
+      }
+    }
+    return await this.runJsonCodeQlCliCommand<UpgradesInfo>(
       ['resolve', 'upgrades'],
       args,
-      "Resolving database upgrade scripts",
+      'Resolving database upgrade scripts',
     );
   }
 
@@ -604,16 +748,82 @@ export class CodeQLCliServer implements Disposable {
    */
   resolveQlpacks(additionalPacks: string[], searchPath?: string[]): Promise<QlpacksInfo> {
     const args = ['--additional-packs', additionalPacks.join(path.delimiter)];
-    if (searchPath !== undefined) {
+    if (searchPath?.length) {
       args.push('--search-path', path.join(...searchPath));
     }
 
     return this.runJsonCodeQlCliCommand<QlpacksInfo>(
       ['resolve', 'qlpacks'],
       args,
-      "Resolving qlpack information",
+      'Resolving qlpack information',
     );
   }
+
+  /**
+   * Gets information about the available languages.
+   * @returns A dictionary mapping language name to the directory it comes from
+   */
+  async resolveLanguages(): Promise<LanguagesInfo> {
+    return await this.runJsonCodeQlCliCommand<LanguagesInfo>(['resolve', 'languages'], [], 'Resolving languages');
+  }
+
+  /**
+   * Gets information about queries in a query suite.
+   * @param suite The suite to resolve.
+   * @param additionalPacks A list of directories to search for qlpacks before searching in `searchPath`.
+   * @param searchPath A list of directories to search for packs not found in `additionalPacks`. If undefined,
+   *   the default CLI search path is used.
+   * @returns A list of query files found.
+   */
+  async resolveQueriesInSuite(suite: string, additionalPacks: string[], searchPath?: string[]): Promise<string[]> {
+    const args = ['--additional-packs', additionalPacks.join(path.delimiter)];
+    if (searchPath !== undefined) {
+      args.push('--search-path', path.join(...searchPath));
+    }
+    if (await this.cliConstraints.supportsAllowLibraryPacksInResolveQueries()) {
+      // All of our usage of `codeql resolve queries` needs to handle library packs.
+      args.push('--allow-library-packs');
+    }
+    args.push(suite);
+    return this.runJsonCodeQlCliCommand<string[]>(
+      ['resolve', 'queries'],
+      args,
+      'Resolving queries',
+    );
+  }
+
+  async generateDil(qloFile: string, outFile: string): Promise<void> {
+    const extraArgs = await this.cliConstraints.supportsDecompileDil()
+      ? ['--kind', 'dil', '-o', outFile, qloFile]
+      : ['-o', outFile, qloFile];
+    await this.runCodeQlCliCommand(
+      ['query', 'decompile'],
+      extraArgs,
+      'Generating DIL',
+    );
+  }
+
+  public async getVersion() {
+    if (!this._version) {
+      this._version = await this.refreshVersion();
+    }
+    return this._version;
+  }
+
+  private async refreshVersion() {
+    const distribution = await this.distributionProvider.getDistribution();
+    switch (distribution.kind) {
+      case FindDistributionResultKind.CompatibleDistribution:
+      // eslint-disable-next-line no-fallthrough
+      case FindDistributionResultKind.IncompatibleDistribution:
+        return distribution.version;
+
+      default:
+        // We should not get here because if no distributions are available, then
+        // the cli class is never instantiated.
+        throw new Error('No distribution found');
+    }
+  }
 }
 
 /**
@@ -645,11 +855,11 @@ export function spawnServer(
 
   // Start the server process.
   const base = codeqlPath;
-  const argsString = args.join(" ");
+  const argsString = args.join(' ');
   if (progressReporter !== undefined) {
     progressReporter.report({ message: `Starting ${name}` });
   }
-  logger.log(`Starting ${name} using CodeQL CLI: ${base} ${argsString}`);
+  void logger.log(`Starting ${name} using CodeQL CLI: ${base} ${argsString}`);
   const child = child_process.spawn(base, args);
   if (!child || !child.pid) {
     throw new Error(`Failed to start ${name} using command ${base} ${argsString}.`);
@@ -665,13 +875,13 @@ export function spawnServer(
   if (progressReporter !== undefined) {
     progressReporter.report({ message: `Started ${name}` });
   }
-  logger.log(`${name} started on PID: ${child.pid}`);
+  void logger.log(`${name} started on PID: ${child.pid}`);
   return child;
 }
 
 /**
  * Runs a CodeQL CLI command without invoking the CLI server, returning the output as a string.
- * @param config The configuration containing the path to the CLI.
+ * @param codeQlPath The path to the CLI.
  * @param command The `codeql` command to be run, provided as an array of command/subcommand names.
  * @param commandArgs The arguments to pass to the `codeql` command.
  * @param description Description of the action being run, to be shown in log and error messages.
@@ -679,21 +889,28 @@ export function spawnServer(
  * @param progressReporter Used to output progress messages, e.g. to the status bar.
  * @returns The contents of the command's stdout, if the command succeeded.
  */
-export async function runCodeQlCliCommand(codeQlPath: string, command: string[], commandArgs: string[], description: string, logger: Logger, progressReporter?: ProgressReporter): Promise<string> {
+export async function runCodeQlCliCommand(
+  codeQlPath: string,
+  command: string[],
+  commandArgs: string[],
+  description: string,
+  logger: Logger,
+  progressReporter?: ProgressReporter
+): Promise<string> {
   // Add logging arguments first, in case commandArgs contains positional parameters.
   const args = command.concat(LOGGING_FLAGS).concat(commandArgs);
-  const argsString = args.join(" ");
+  const argsString = args.join(' ');
   try {
     if (progressReporter !== undefined) {
       progressReporter.report({ message: description });
     }
-    logger.log(`${description} using CodeQL CLI: ${codeQlPath} ${argsString}...`);
-    const result = await util.promisify(child_process.execFile)(codeQlPath, args);
-    logger.log(result.stderr);
-    logger.log(`CLI command succeeded.`);
+    void logger.log(`${description} using CodeQL CLI: ${codeQlPath} ${argsString}...`);
+    const result = await promisify(child_process.execFile)(codeQlPath, args);
+    void logger.log(result.stderr);
+    void logger.log('CLI command succeeded.');
     return result.stdout;
   } catch (err) {
-    throw new Error(`${description} failed: ${err.stderr || err}`)
+    throw new Error(`${description} failed: ${err.stderr || err}`);
   }
 }
 
@@ -726,6 +943,20 @@ class SplitBuffer {
     this.buffer += this.separators[0];  // Append a separator to the end to ensure the last line is returned.
   }
 
+  /**
+   * A version of startsWith that isn't overriden by a broken version of ms-python.
+   *
+   * The definition comes from
+   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith
+   * which is CC0/public domain
+   *
+   * See https://github.com/github/vscode-codeql/issues/802 for more context as to why we need it.
+   */
+  private static startsWith(s: string, searchString: string, position: number): boolean {
+    const pos = position > 0 ? position | 0 : 0;
+    return s.substring(pos, pos + searchString.length) === searchString;
+  }
+
   /**
    * Extract the next full line from the buffer, if one is available.
    * @returns The text of the next available full line (without the separator), or `undefined` if no
@@ -734,7 +965,7 @@ class SplitBuffer {
   public getNextLine(): string | undefined {
     while (this.searchIndex <= (this.buffer.length - this.maxSeparatorLength)) {
       for (const separator of this.separators) {
-        if (this.buffer.startsWith(separator, this.searchIndex)) {
+        if (SplitBuffer.startsWith(this.buffer, separator, this.searchIndex)) {
           const line = this.buffer.substr(0, this.searchIndex);
           this.buffer = this.buffer.substr(this.searchIndex + separator.length);
           this.searchIndex = 0;
@@ -791,6 +1022,87 @@ const lineEndings = ['\r\n', '\r', '\n'];
  */
 async function logStream(stream: Readable, logger: Logger): Promise<void> {
   for await (const line of await splitStreamAtSeparators(stream, lineEndings)) {
-    logger.log(line);
+    // Await the result of log here in order to ensure the logs are written in the correct order.
+    await logger.log(line);
+  }
+}
+
+
+export function shouldDebugIdeServer() {
+  return 'IDE_SERVER_JAVA_DEBUG' in process.env
+    && process.env.IDE_SERVER_JAVA_DEBUG !== '0'
+    && process.env.IDE_SERVER_JAVA_DEBUG?.toLocaleLowerCase() !== 'false';
+}
+
+export function shouldDebugQueryServer() {
+  return 'QUERY_SERVER_JAVA_DEBUG' in process.env
+    && process.env.QUERY_SERVER_JAVA_DEBUG !== '0'
+    && process.env.QUERY_SERVER_JAVA_DEBUG?.toLocaleLowerCase() !== 'false';
+}
+
+export class CliVersionConstraint {
+
+  /**
+   * CLI version where --kind=DIL was introduced
+   */
+  public static CLI_VERSION_WITH_DECOMPILE_KIND_DIL = new SemVer('2.3.0');
+
+  /**
+   * CLI version where languages are exposed during a `codeql resolve database` command.
+   */
+  public static CLI_VERSION_WITH_LANGUAGE = new SemVer('2.4.1');
+
+  /**
+   * CLI version where `codeql resolve upgrades` supports
+   * the `--allow-downgrades` flag
+   */
+  public static CLI_VERSION_WITH_DOWNGRADES = new SemVer('2.4.4');
+
+  /**
+   * CLI version where the `codeql resolve qlref` command is available.
+   */
+  public static CLI_VERSION_WITH_RESOLVE_QLREF = new SemVer('2.5.1');
+
+  /**
+   * CLI version where database registration was introduced
+   */
+  public static CLI_VERSION_WITH_DB_REGISTRATION = new SemVer('2.4.1');
+
+  /**
+   * CLI version where the `--allow-library-packs` option to `codeql resolve queries` was
+   * introduced.
+   */
+  public static CLI_VERSION_WITH_ALLOW_LIBRARY_PACKS_IN_RESOLVE_QUERIES = new SemVer('2.6.1');
+
+  constructor(private readonly cli: CodeQLCliServer) {
+    /**/
+  }
+
+  private async isVersionAtLeast(v: SemVer) {
+    return (await this.cli.getVersion()).compare(v) >= 0;
+  }
+
+  public async supportsDecompileDil() {
+    return this.isVersionAtLeast(CliVersionConstraint.CLI_VERSION_WITH_DECOMPILE_KIND_DIL);
+  }
+
+  public async supportsLanguageName() {
+    return this.isVersionAtLeast(CliVersionConstraint.CLI_VERSION_WITH_LANGUAGE);
+  }
+
+  public async supportsDowngrades() {
+    return this.isVersionAtLeast(CliVersionConstraint.CLI_VERSION_WITH_DOWNGRADES);
+  }
+
+  public async supportsResolveQlref() {
+    return this.isVersionAtLeast(CliVersionConstraint.CLI_VERSION_WITH_RESOLVE_QLREF);
+  }
+
+  public async supportsAllowLibraryPacksInResolveQueries() {
+    return this.isVersionAtLeast(CliVersionConstraint.CLI_VERSION_WITH_ALLOW_LIBRARY_PACKS_IN_RESOLVE_QUERIES);
+  }
+
+  async supportsDatabaseRegistration() {
+    return this.isVersionAtLeast(CliVersionConstraint.CLI_VERSION_WITH_DB_REGISTRATION);
   }
 }

extensions/ql-vscode/src/commandRunner.ts

@@ -0,0 +1,241 @@
+import {
+  CancellationToken,
+  ProgressOptions,
+  window as Window,
+  commands,
+  Disposable,
+  ProgressLocation
+} from 'vscode';
+import { showAndLogErrorMessage, showAndLogWarningMessage } from './helpers';
+import { logger } from './logging';
+import { telemetryListener } from './telemetry';
+
+export class UserCancellationException extends Error {
+  /**
+   * @param message The error message
+   * @param silent If silent is true, then this exception will avoid showing a warning message to the user.
+   */
+  constructor(message?: string, public readonly silent = false) {
+    super(message);
+  }
+}
+
+export interface ProgressUpdate {
+  /**
+   * The current step
+   */
+  step: number;
+  /**
+   * The maximum step. This *should* be constant for a single job.
+   */
+  maxStep: number;
+  /**
+   * The current progress message
+   */
+  message: string;
+}
+
+export type ProgressCallback = (p: ProgressUpdate) => void;
+
+/**
+ * A task that handles command invocations from `commandRunner`
+ * and includes a progress monitor.
+ *
+ *
+ * Arguments passed to the command handler are passed along,
+ * untouched to this `ProgressTask` instance.
+ *
+ * @param progress a progress handler function. Call this
+ * function with a `ProgressUpdate` instance in order to
+ * denote some progress being achieved on this task.
+ * @param token a cencellation token
+ * @param args arguments passed to this task passed on from
+ * `commands.registerCommand`.
+ */
+export type ProgressTask<R> = (
+  progress: ProgressCallback,
+  token: CancellationToken,
+  ...args: any[]
+) => Thenable<R>;
+
+/**
+ * A task that handles command invocations from `commandRunner`.
+ * Arguments passed to the command handler are passed along,
+ * untouched to this `NoProgressTask` instance.
+ *
+ * @param args arguments passed to this task passed on from
+ * `commands.registerCommand`.
+ */
+type NoProgressTask = ((...args: any[]) => Promise<any>);
+
+/**
+ * This mediates between the kind of progress callbacks we want to
+ * write (where we *set* current progress position and give
+ * `maxSteps`) and the kind vscode progress api expects us to write
+ * (which increment progress by a certain amount out of 100%).
+ *
+ * Where possible, the `commandRunner` function below should be used
+ * instead of this function. The commandRunner is meant for wrapping
+ * top-level commands and provides error handling and other support
+ * automatically.
+ *
+ * Only use this function if you need a progress monitor and the
+ * control flow does not always come from a command (eg- during
+ * extension activation, or from an internal language server
+ * request).
+ */
+export function withProgress<R>(
+  options: ProgressOptions,
+  task: ProgressTask<R>,
+  ...args: any[]
+): Thenable<R> {
+  let progressAchieved = 0;
+  return Window.withProgress(options,
+    (progress, token) => {
+      return task(p => {
+        const { message, step, maxStep } = p;
+        const increment = 100 * (step - progressAchieved) / maxStep;
+        progressAchieved = step;
+        progress.report({ message, increment });
+      }, token, ...args);
+    });
+}
+
+/**
+ * A generic wrapper for command registration. This wrapper adds uniform error handling for commands.
+ *
+ * In this variant of the command runner, no progress monitor is used.
+ *
+ * @param commandId The ID of the command to register.
+ * @param task The task to run. It is passed directly to `commands.registerCommand`. Any
+ * arguments to the command handler are passed on to the task.
+ */
+export function commandRunner(
+  commandId: string,
+  task: NoProgressTask,
+): Disposable {
+  return commands.registerCommand(commandId, async (...args: any[]) => {
+    const startTime = Date.now();
+    let error: Error | undefined;
+
+    try {
+      return await task(...args);
+    } catch (e) {
+      error = e;
+      const errorMessage = `${e.message || e} (${commandId})`;
+      if (e instanceof UserCancellationException) {
+        // User has cancelled this action manually
+        if (e.silent) {
+          void logger.log(errorMessage);
+        } else {
+          void showAndLogWarningMessage(errorMessage);
+        }
+      } else {
+        // Include the full stack in the error log only.
+        const fullMessage = e.stack
+          ? `${errorMessage}\n${e.stack}`
+          : errorMessage;
+        void showAndLogErrorMessage(errorMessage, {
+          fullMessage
+        });
+      }
+      return undefined;
+    } finally {
+      const executionTime = Date.now() - startTime;
+      telemetryListener.sendCommandUsage(commandId, executionTime, error);
+    }
+  });
+}
+
+/**
+ * A generic wrapper for command registration.  This wrapper adds uniform error handling,
+ * progress monitoring, and cancellation for commands.
+ *
+ * @param commandId The ID of the command to register.
+ * @param task The task to run. It is passed directly to `commands.registerCommand`. Any
+ * arguments to the command handler are passed on to the task after the progress callback
+ * and cancellation token.
+ * @param progressOptions Progress options to be sent to the progress monitor.
+ */
+export function commandRunnerWithProgress<R>(
+  commandId: string,
+  task: ProgressTask<R>,
+  progressOptions: Partial<ProgressOptions>
+): Disposable {
+  return commands.registerCommand(commandId, async (...args: any[]) => {
+    const startTime = Date.now();
+    let error: Error | undefined;
+    const progressOptionsWithDefaults = {
+      location: ProgressLocation.Notification,
+      ...progressOptions
+    };
+    try {
+      return await withProgress(progressOptionsWithDefaults, task, ...args);
+    } catch (e) {
+      error = e;
+      const errorMessage = `${e.message || e} (${commandId})`;
+      if (e instanceof UserCancellationException) {
+        // User has cancelled this action manually
+        if (e.silent) {
+          void logger.log(errorMessage);
+        } else {
+          void showAndLogWarningMessage(errorMessage);
+        }
+      } else {
+        // Include the full stack in the error log only.
+        const fullMessage = e.stack
+          ? `${errorMessage}\n${e.stack}`
+          : errorMessage;
+        void showAndLogErrorMessage(errorMessage, {
+          fullMessage
+        });
+      }
+      return undefined;
+    } finally {
+      const executionTime = Date.now() - startTime;
+      telemetryListener.sendCommandUsage(commandId, executionTime, error);
+    }
+  });
+}
+
+/**
+ * Displays a progress monitor that indicates how much progess has been made
+ * reading from a stream.
+ *
+ * @param readable The stream to read progress from
+ * @param messagePrefix A prefix for displaying the message
+ * @param totalNumBytes Total number of bytes in this stream
+ * @param progress The progress callback used to set messages
+ */
+export function reportStreamProgress(
+  readable: NodeJS.ReadableStream,
+  messagePrefix: string,
+  totalNumBytes?: number,
+  progress?: ProgressCallback
+) {
+  if (progress && totalNumBytes) {
+    let numBytesDownloaded = 0;
+    const bytesToDisplayMB = (numBytes: number): string => `${(numBytes / (1024 * 1024)).toFixed(1)} MB`;
+    const updateProgress = () => {
+      progress({
+        step: numBytesDownloaded,
+        maxStep: totalNumBytes,
+        message: `${messagePrefix} [${bytesToDisplayMB(numBytesDownloaded)} of ${bytesToDisplayMB(totalNumBytes)}]`,
+      });
+    };
+
+    // Display the progress straight away rather than waiting for the first chunk.
+    updateProgress();
+
+    readable.on('data', data => {
+      numBytesDownloaded += data.length;
+      updateProgress();
+    });
+  } else if (progress) {
+    progress({
+      step: 1,
+      maxStep: 2,
+      message: `${messagePrefix} (Size unknown)`,
+    });
+  }
+}

extensions/ql-vscode/src/compare/compare-interface.ts

@@ -0,0 +1,277 @@
+import { DisposableObject } from '../pure/disposable-object';
+import {
+  WebviewPanel,
+  ExtensionContext,
+  window as Window,
+  ViewColumn,
+  Uri,
+} from 'vscode';
+import * as path from 'path';
+
+import { tmpDir } from '../run-queries';
+import { CompletedQuery } from '../query-results';
+import {
+  FromCompareViewMessage,
+  ToCompareViewMessage,
+  QueryCompareResult,
+} from '../pure/interface-types';
+import { Logger } from '../logging';
+import { CodeQLCliServer } from '../cli';
+import { DatabaseManager } from '../databases';
+import { getHtmlForWebview, jumpToLocation } from '../interface-utils';
+import { transformBqrsResultSet, RawResultSet, BQRSInfo } from '../pure/bqrs-cli-types';
+import resultsDiff from './resultsDiff';
+
+interface ComparePair {
+  from: CompletedQuery;
+  to: CompletedQuery;
+}
+
+export class CompareInterfaceManager extends DisposableObject {
+  private comparePair: ComparePair | undefined;
+  private panel: WebviewPanel | undefined;
+  private panelLoaded = false;
+  private panelLoadedCallBacks: (() => void)[] = [];
+
+  constructor(
+    private ctx: ExtensionContext,
+    private databaseManager: DatabaseManager,
+    private cliServer: CodeQLCliServer,
+    private logger: Logger,
+    private showQueryResultsCallback: (
+      item: CompletedQuery
+    ) => Promise<void>
+  ) {
+    super();
+  }
+
+  async showResults(
+    from: CompletedQuery,
+    to: CompletedQuery,
+    selectedResultSetName?: string
+  ) {
+    this.comparePair = { from, to };
+    this.getPanel().reveal(undefined, true);
+
+    await this.waitForPanelLoaded();
+    const [
+      commonResultSetNames,
+      currentResultSetName,
+      fromResultSet,
+      toResultSet,
+    ] = await this.findCommonResultSetNames(
+      from,
+      to,
+      selectedResultSetName
+    );
+    if (currentResultSetName) {
+      let rows: QueryCompareResult | undefined;
+      let message: string | undefined;
+      try {
+        rows = this.compareResults(fromResultSet, toResultSet);
+      } catch (e) {
+        message = e.message;
+      }
+
+      await this.postMessage({
+        t: 'setComparisons',
+        stats: {
+          fromQuery: {
+            // since we split the description into several rows
+            // only run interpolation if the label is user-defined
+            // otherwise we will wind up with duplicated rows
+            name: from.options.label
+              ? from.interpolate(from.getLabel())
+              : from.queryName,
+            status: from.statusString,
+            time: from.time,
+          },
+          toQuery: {
+            name: to.options.label
+              ? to.interpolate(to.getLabel())
+              : to.queryName,
+            status: to.statusString,
+            time: to.time,
+          },
+        },
+        columns: fromResultSet.schema.columns,
+        commonResultSetNames,
+        currentResultSetName: currentResultSetName,
+        rows,
+        message,
+        datebaseUri: to.database.databaseUri,
+      });
+    }
+  }
+
+  getPanel(): WebviewPanel {
+    if (this.panel == undefined) {
+      const { ctx } = this;
+      const panel = (this.panel = Window.createWebviewPanel(
+        'compareView',
+        'Compare CodeQL Query Results',
+        { viewColumn: ViewColumn.Active, preserveFocus: true },
+        {
+          enableScripts: true,
+          enableFindWidget: true,
+          retainContextWhenHidden: true,
+          localResourceRoots: [
+            Uri.file(tmpDir.name),
+            Uri.file(path.join(this.ctx.extensionPath, 'out')),
+          ],
+        }
+      ));
+      this.panel.onDidDispose(
+        () => {
+          this.panel = undefined;
+          this.comparePair = undefined;
+        },
+        null,
+        ctx.subscriptions
+      );
+
+      const scriptPathOnDisk = Uri.file(
+        ctx.asAbsolutePath('out/compareView.js')
+      );
+
+      const stylesheetPathOnDisk = Uri.file(
+        ctx.asAbsolutePath('out/resultsView.css')
+      );
+
+      panel.webview.html = getHtmlForWebview(
+        panel.webview,
+        scriptPathOnDisk,
+        stylesheetPathOnDisk
+      );
+      panel.webview.onDidReceiveMessage(
+        async (e) => this.handleMsgFromView(e),
+        undefined,
+        ctx.subscriptions
+      );
+    }
+    return this.panel;
+  }
+
+  private waitForPanelLoaded(): Promise<void> {
+    return new Promise((resolve) => {
+      if (this.panelLoaded) {
+        resolve();
+      } else {
+        this.panelLoadedCallBacks.push(resolve);
+      }
+    });
+  }
+
+  private async handleMsgFromView(
+    msg: FromCompareViewMessage
+  ): Promise<void> {
+    switch (msg.t) {
+      case 'compareViewLoaded':
+        this.panelLoaded = true;
+        this.panelLoadedCallBacks.forEach((cb) => cb());
+        this.panelLoadedCallBacks = [];
+        break;
+
+      case 'changeCompare':
+        await this.changeTable(msg.newResultSetName);
+        break;
+
+      case 'viewSourceFile':
+        await jumpToLocation(msg, this.databaseManager, this.logger);
+        break;
+
+      case 'openQuery':
+        await this.openQuery(msg.kind);
+        break;
+    }
+  }
+
+  private postMessage(msg: ToCompareViewMessage): Thenable<boolean> {
+    return this.getPanel().webview.postMessage(msg);
+  }
+
+  private async findCommonResultSetNames(
+    from: CompletedQuery,
+    to: CompletedQuery,
+    selectedResultSetName: string | undefined
+  ): Promise<[string[], string, RawResultSet, RawResultSet]> {
+    const fromSchemas = await this.cliServer.bqrsInfo(
+      from.query.resultsPaths.resultsPath
+    );
+    const toSchemas = await this.cliServer.bqrsInfo(
+      to.query.resultsPaths.resultsPath
+    );
+    const fromSchemaNames = fromSchemas['result-sets'].map(
+      (schema) => schema.name
+    );
+    const toSchemaNames = toSchemas['result-sets'].map(
+      (schema) => schema.name
+    );
+    const commonResultSetNames = fromSchemaNames.filter((name) =>
+      toSchemaNames.includes(name)
+    );
+    const currentResultSetName =
+      selectedResultSetName || commonResultSetNames[0];
+    const fromResultSet = await this.getResultSet(
+      fromSchemas,
+      currentResultSetName,
+      from.query.resultsPaths.resultsPath
+    );
+    const toResultSet = await this.getResultSet(
+      toSchemas,
+      currentResultSetName,
+      to.query.resultsPaths.resultsPath
+    );
+    return [
+      commonResultSetNames,
+      currentResultSetName,
+      fromResultSet,
+      toResultSet,
+    ];
+  }
+
+  private async changeTable(newResultSetName: string) {
+    if (!this.comparePair?.from || !this.comparePair.to) {
+      return;
+    }
+    await this.showResults(
+      this.comparePair.from,
+      this.comparePair.to,
+      newResultSetName
+    );
+  }
+
+  private async getResultSet(
+    bqrsInfo: BQRSInfo,
+    resultSetName: string,
+    resultsPath: string
+  ): Promise<RawResultSet> {
+    const schema = bqrsInfo['result-sets'].find(
+      (schema) => schema.name === resultSetName
+    );
+    if (!schema) {
+      throw new Error(`Schema ${resultSetName} not found.`);
+    }
+    const chunk = await this.cliServer.bqrsDecode(
+      resultsPath,
+      resultSetName
+    );
+    return transformBqrsResultSet(schema, chunk);
+  }
+
+  private compareResults(
+    fromResults: RawResultSet,
+    toResults: RawResultSet
+  ): QueryCompareResult {
+    // Only compare columns that have the same name
+    return resultsDiff(fromResults, toResults);
+  }
+
+  private async openQuery(kind: 'from' | 'to') {
+    const toOpen =
+      kind === 'from' ? this.comparePair?.from : this.comparePair?.to;
+    if (toOpen) {
+      await this.showQueryResultsCallback(toOpen);
+    }
+  }
+}

extensions/ql-vscode/src/compare/resultsDiff.ts

@@ -0,0 +1,58 @@
+import { RawResultSet } from '../pure/bqrs-cli-types';
+import { QueryCompareResult } from '../pure/interface-types';
+
+/**
+ * Compare the rows of two queries. Use deep equality to determine if
+ * rows have been added or removed across two invocations of a query.
+ *
+ * Assumptions:
+ *
+ * 1. Queries have the same sort order
+ * 2. Queries have same number and order of columns
+ * 3. Rows are not changed or re-ordered, they are only added or removed
+ *
+ * @param fromResults the source query
+ * @param toResults the target query
+ *
+ * @throws Error when:
+ *  1. number of columns do not match
+ *  2. If either query is empty
+ *  3. If the queries are 100% disjoint
+ */
+export default function resultsDiff(
+  fromResults: RawResultSet,
+  toResults: RawResultSet
+): QueryCompareResult {
+
+  if (fromResults.schema.columns.length !== toResults.schema.columns.length) {
+    throw new Error('CodeQL Compare: Columns do not match.');
+  }
+
+  if (!fromResults.rows.length) {
+    throw new Error('CodeQL Compare: Source query has no results.');
+  }
+
+  if (!toResults.rows.length) {
+    throw new Error('CodeQL Compare: Target query has no results.');
+  }
+
+  const results = {
+    from: arrayDiff(fromResults.rows, toResults.rows),
+    to: arrayDiff(toResults.rows, fromResults.rows),
+  };
+
+  if (
+    fromResults.rows.length === results.from.length &&
+    toResults.rows.length === results.to.length
+  ) {
+    throw new Error('CodeQL Compare: No overlap between the selected queries.');
+  }
+
+  return results;
+}
+
+function arrayDiff<T>(source: readonly T[], toRemove: readonly T[]): T[] {
+  // Stringify the object so that we can compare hashes in the set
+  const rest = new Set(toRemove.map((item) => JSON.stringify(item)));
+  return source.filter((element) => !rest.has(JSON.stringify(element)));
+}

extensions/ql-vscode/src/compare/view/.eslintrc.js

@@ -0,0 +1,13 @@
+module.exports = {
+  env: {
+    browser: true
+  },
+  extends: [
+    "plugin:react/recommended"
+  ],
+  settings: {
+    react: {
+      version: 'detect'
+    }
+  }
+}

extensions/ql-vscode/src/compare/view/Compare.tsx

@@ -0,0 +1,84 @@
+import * as React from 'react';
+import { useState, useEffect } from 'react';
+import * as Rdom from 'react-dom';
+
+import {
+  ToCompareViewMessage,
+  SetComparisonsMessage,
+} from '../../pure/interface-types';
+import CompareSelector from './CompareSelector';
+import { vscode } from '../../view/vscode-api';
+import CompareTable from './CompareTable';
+
+const emptyComparison: SetComparisonsMessage = {
+  t: 'setComparisons',
+  stats: {},
+  rows: undefined,
+  columns: [],
+  commonResultSetNames: [],
+  currentResultSetName: '',
+  datebaseUri: '',
+  message: 'Empty comparison'
+};
+
+export function Compare(_: Record<string, never>): JSX.Element {
+  const [comparison, setComparison] = useState<SetComparisonsMessage>(
+    emptyComparison
+  );
+
+  const message = comparison.message || 'Empty comparison';
+  const hasRows = comparison.rows && (comparison.rows.to.length || comparison.rows.from.length);
+
+  useEffect(() => {
+    window.addEventListener('message', (evt: MessageEvent) => {
+      if (evt.origin === window.origin) {
+        const msg: ToCompareViewMessage = evt.data;
+        switch (msg.t) {
+          case 'setComparisons':
+            setComparison(msg);
+        }
+      } else {
+        // sanitize origin
+        const origin = evt.origin.replace(/\n|\r/g, '');
+        console.error(`Invalid event origin ${origin}`);
+      }
+    });
+  });
+  if (!comparison) {
+    return <div>Waiting for results to load.</div>;
+  }
+
+  try {
+    return (
+      <>
+        <div className="vscode-codeql__compare-header">
+          <div className="vscode-codeql__compare-header-item">
+            Table to compare:
+          </div>
+          <CompareSelector
+            availableResultSets={comparison.commonResultSetNames}
+            currentResultSetName={comparison.currentResultSetName}
+            updateResultSet={(newResultSetName: string) =>
+              vscode.postMessage({ t: 'changeCompare', newResultSetName })
+            }
+          />
+        </div>
+        {hasRows ? (
+          <CompareTable comparison={comparison}></CompareTable>
+        ) : (
+          <div className="vscode-codeql__compare-message">{message}</div>
+        )}
+      </>
+    );
+  } catch (err) {
+    console.error(err);
+    return <div>Error!</div>;
+  }
+}
+
+Rdom.render(
+  <Compare />,
+  document.getElementById('root'),
+  // Post a message to the extension when fully loaded.
+  () => vscode.postMessage({ t: 'compareViewLoaded' })
+);

extensions/ql-vscode/src/compare/view/CompareSelector.tsx

@@ -0,0 +1,22 @@
+import * as React from 'react';
+
+interface Props {
+  availableResultSets: string[];
+  currentResultSetName: string;
+  updateResultSet: (newResultSet: string) => void;
+}
+
+export default function CompareSelector(props: Props) {
+  return (
+    <select
+      value={props.currentResultSetName}
+      onChange={(e) => props.updateResultSet(e.target.value)}
+    >
+      {props.availableResultSets.map((resultSet) => (
+        <option key={resultSet} value={resultSet}>
+          {resultSet}
+        </option>
+      ))}
+    </select>
+  );
+}

extensions/ql-vscode/src/compare/view/CompareTable.tsx

@@ -0,0 +1,96 @@
+import * as React from 'react';
+
+import { SetComparisonsMessage } from '../../pure/interface-types';
+import RawTableHeader from '../../view/RawTableHeader';
+import { className } from '../../view/result-table-utils';
+import { ResultRow } from '../../pure/bqrs-cli-types';
+import RawTableRow from '../../view/RawTableRow';
+import { vscode } from '../../view/vscode-api';
+
+interface Props {
+  comparison: SetComparisonsMessage;
+}
+
+export default function CompareTable(props: Props) {
+  const comparison = props.comparison;
+  const rows = props.comparison.rows!;
+
+  async function openQuery(kind: 'from' | 'to') {
+    vscode.postMessage({
+      t: 'openQuery',
+      kind,
+    });
+  }
+
+  function createRows(rows: ResultRow[], databaseUri: string) {
+    return (
+      <tbody>
+        {rows.map((row, rowIndex) => (
+          <RawTableRow
+            key={rowIndex}
+            rowIndex={rowIndex}
+            row={row}
+            databaseUri={databaseUri}
+          />
+        ))}
+      </tbody>
+    );
+  }
+
+  return (
+    <table className='vscode-codeql__compare-body'>
+      <thead>
+        <tr>
+          <td>
+            <a
+              onClick={() => openQuery('from')}
+              className='vscode-codeql__compare-open'
+            >
+              {comparison.stats.fromQuery?.name}
+            </a>
+          </td>
+          <td>
+            <a
+              onClick={() => openQuery('to')}
+              className='vscode-codeql__compare-open'
+            >
+              {comparison.stats.toQuery?.name}
+            </a>
+          </td>
+        </tr>
+        <tr>
+          <td>{comparison.stats.fromQuery?.time}</td>
+          <td>{comparison.stats.toQuery?.time}</td>
+        </tr>
+        <tr>
+          <th>{rows.from.length} rows removed</th>
+          <th>{rows.to.length} rows added</th>
+        </tr>
+      </thead>
+      <tbody>
+        <tr>
+          <td>
+            <table className={className}>
+              <RawTableHeader
+                columns={comparison.columns}
+                schemaName={comparison.currentResultSetName}
+                preventSort={true}
+              />
+              {createRows(rows.from, comparison.datebaseUri)}
+            </table>
+          </td>
+          <td>
+            <table className={className}>
+              <RawTableHeader
+                columns={comparison.columns}
+                schemaName={comparison.currentResultSetName}
+                preventSort={true}
+              />
+              {createRows(rows.to, comparison.datebaseUri)}
+            </table>
+          </td>
+        </tr>
+      </tbody>
+    </table>
+  );
+}

extensions/ql-vscode/src/compare/view/tsconfig.json

@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "module": "esnext",
+    "moduleResolution": "node",
+    "target": "es6",
+    "outDir": "out",
+    "lib": [
+      "es6",
+      "dom"
+    ],
+    "jsx": "react",
+    "sourceMap": true,
+    "rootDir": "..",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "experimentalDecorators": true
+  },
+  "exclude": [
+    "node_modules"
+  ]
+}

extensions/ql-vscode/src/config.ts

@@ -1,10 +1,10 @@
-import { DisposableObject } from 'semmle-vscode-utils';
-import { workspace, Event, EventEmitter, ConfigurationChangeEvent } from 'vscode';
+import { DisposableObject } from './pure/disposable-object';
+import { workspace, Event, EventEmitter, ConfigurationChangeEvent, ConfigurationTarget } from 'vscode';
 import { DistributionManager } from './distribution';
 import { logger } from './logging';
 
 /** Helper class to look up a labelled (and possibly nested) setting. */
-class Setting {
+export class Setting {
   name: string;
   parent?: Setting;
 
@@ -27,14 +27,31 @@ class Setting {
     }
     return workspace.getConfiguration(this.parent.qualifiedName).get<T>(this.name)!;
   }
+
+  updateValue<T>(value: T, target: ConfigurationTarget): Thenable<void> {
+    if (this.parent === undefined) {
+      throw new Error('Cannot update the value of a root setting.');
+    }
+    return workspace.getConfiguration(this.parent.qualifiedName).update(this.name, value, target);
+  }
+
 }
 
 const ROOT_SETTING = new Setting('codeQL');
 
-// Distribution configuration
+// Global configuration
+const TELEMETRY_SETTING = new Setting('telemetry', ROOT_SETTING);
+const AST_VIEWER_SETTING = new Setting('astViewer', ROOT_SETTING);
+const GLOBAL_TELEMETRY_SETTING = new Setting('telemetry');
 
+export const LOG_TELEMETRY = new Setting('logTelemetry', TELEMETRY_SETTING);
+export const ENABLE_TELEMETRY = new Setting('enableTelemetry', TELEMETRY_SETTING);
+
+export const GLOBAL_ENABLE_TELEMETRY = new Setting('enableTelemetry', GLOBAL_TELEMETRY_SETTING);
+
+// Distribution configuration
 const DISTRIBUTION_SETTING = new Setting('cli', ROOT_SETTING);
-const CUSTOM_CODEQL_PATH_SETTING = new Setting('executablePath', DISTRIBUTION_SETTING);
+export const CUSTOM_CODEQL_PATH_SETTING = new Setting('executablePath', DISTRIBUTION_SETTING);
 const INCLUDE_PRERELEASE_SETTING = new Setting('includePrerelease', DISTRIBUTION_SETTING);
 const PERSONAL_ACCESS_TOKEN_SETTING = new Setting('personalAccessToken', DISTRIBUTION_SETTING);
 const QUERY_HISTORY_SETTING = new Setting('queryHistory', ROOT_SETTING);
@@ -44,32 +61,48 @@ const QUERY_HISTORY_FORMAT_SETTING = new Setting('format', QUERY_HISTORY_SETTING
 const DISTRIBUTION_CHANGE_SETTINGS = [CUSTOM_CODEQL_PATH_SETTING, INCLUDE_PRERELEASE_SETTING, PERSONAL_ACCESS_TOKEN_SETTING];
 
 export interface DistributionConfig {
-  customCodeQlPath?: string;
+  readonly customCodeQlPath?: string;
+  updateCustomCodeQlPath: (newPath: string | undefined) => Promise<void>;
   includePrerelease: boolean;
   personalAccessToken?: string;
   ownerName?: string;
   repositoryName?: string;
-  onDidChangeDistributionConfiguration?: Event<void>;
+  onDidChangeConfiguration?: Event<void>;
 }
 
 // Query server configuration
 
 const RUNNING_QUERIES_SETTING = new Setting('runningQueries', ROOT_SETTING);
 const NUMBER_OF_THREADS_SETTING = new Setting('numberOfThreads', RUNNING_QUERIES_SETTING);
+const SAVE_CACHE_SETTING = new Setting('saveCache', RUNNING_QUERIES_SETTING);
+const CACHE_SIZE_SETTING = new Setting('cacheSize', RUNNING_QUERIES_SETTING);
 const TIMEOUT_SETTING = new Setting('timeout', RUNNING_QUERIES_SETTING);
 const MEMORY_SETTING = new Setting('memory', RUNNING_QUERIES_SETTING);
 const DEBUG_SETTING = new Setting('debug', RUNNING_QUERIES_SETTING);
+const MAX_PATHS = new Setting('maxPaths', RUNNING_QUERIES_SETTING);
+const RUNNING_TESTS_SETTING = new Setting('runningTests', ROOT_SETTING);
+const RESULTS_DISPLAY_SETTING = new Setting('resultsDisplay', ROOT_SETTING);
+
+export const ADDITIONAL_TEST_ARGUMENTS_SETTING = new Setting('additionalTestArguments', RUNNING_TESTS_SETTING);
+export const NUMBER_OF_TEST_THREADS_SETTING = new Setting('numberOfThreads', RUNNING_TESTS_SETTING);
+export const MAX_QUERIES = new Setting('maxQueries', RUNNING_QUERIES_SETTING);
+export const AUTOSAVE_SETTING = new Setting('autoSave', RUNNING_QUERIES_SETTING);
+export const PAGE_SIZE = new Setting('pageSize', RESULTS_DISPLAY_SETTING);
+const CUSTOM_LOG_DIRECTORY_SETTING = new Setting('customLogDirectory', RUNNING_QUERIES_SETTING);
 
 /** When these settings change, the running query server should be restarted. */
-const QUERY_SERVER_RESTARTING_SETTINGS = [NUMBER_OF_THREADS_SETTING, MEMORY_SETTING, DEBUG_SETTING];
+const QUERY_SERVER_RESTARTING_SETTINGS = [NUMBER_OF_THREADS_SETTING, SAVE_CACHE_SETTING, CACHE_SIZE_SETTING, MEMORY_SETTING, DEBUG_SETTING, CUSTOM_LOG_DIRECTORY_SETTING];
 
 export interface QueryServerConfig {
   codeQlPath: string;
   debug: boolean;
   numThreads: number;
+  saveCache: boolean;
+  cacheSize: number;
   queryMemoryMb?: number;
   timeoutSecs: number;
-  onDidChangeQueryServerConfiguration?: Event<void>;
+  customLogDirectory?: string;
+  onDidChangeConfiguration?: Event<void>;
 }
 
 /** When these settings change, the query history should be refreshed. */
@@ -77,10 +110,21 @@ const QUERY_HISTORY_SETTINGS = [QUERY_HISTORY_FORMAT_SETTING];
 
 export interface QueryHistoryConfig {
   format: string;
-  onDidChangeQueryHistoryConfiguration: Event<void>;
+  onDidChangeConfiguration: Event<void>;
 }
 
-abstract class ConfigListener extends DisposableObject {
+const CLI_SETTINGS = [ADDITIONAL_TEST_ARGUMENTS_SETTING, NUMBER_OF_TEST_THREADS_SETTING, NUMBER_OF_THREADS_SETTING, MAX_PATHS];
+
+export interface CliConfig {
+  additionalTestArguments: string[];
+  numberTestThreads: number;
+  numberThreads: number;
+  maxPaths: number;
+  onDidChangeConfiguration?: Event<void>;
+}
+
+
+export abstract class ConfigListener extends DisposableObject {
   protected readonly _onDidChangeConfiguration = this.push(new EventEmitter<void>());
 
   constructor() {
@@ -105,7 +149,11 @@ abstract class ConfigListener extends DisposableObject {
 
   protected abstract handleDidChangeConfiguration(e: ConfigurationChangeEvent): void;
   private updateConfiguration(): void {
-    this._onDidChangeConfiguration.fire();
+    this._onDidChangeConfiguration.fire(undefined);
+  }
+
+  public get onDidChangeConfiguration(): Event<void> {
+    return this._onDidChangeConfiguration.event;
   }
 }
 
@@ -122,8 +170,8 @@ export class DistributionConfigListener extends ConfigListener implements Distri
     return PERSONAL_ACCESS_TOKEN_SETTING.getValue() || undefined;
   }
 
-  public get onDidChangeDistributionConfiguration(): Event<void> {
-    return this._onDidChangeConfiguration.event;
+  public async updateCustomCodeQlPath(newPath: string | undefined) {
+    await CUSTOM_CODEQL_PATH_SETTING.updateValue(newPath, ConfigurationTarget.Global);
   }
 
   protected handleDidChangeConfiguration(e: ConfigurationChangeEvent): void {
@@ -132,7 +180,7 @@ export class DistributionConfigListener extends ConfigListener implements Distri
 }
 
 export class QueryServerConfigListener extends ConfigListener implements QueryServerConfig {
-  private constructor(private _codeQlPath: string) {
+  public constructor(private _codeQlPath = '') {
     super();
   }
 
@@ -143,7 +191,7 @@ export class QueryServerConfigListener extends ConfigListener implements QuerySe
       config.push(distributionManager.onDidChangeDistribution(async () => {
         const codeQlPath = await distributionManager.getCodeQlPathWithoutVersionCheck();
         config._codeQlPath = codeQlPath!;
-        config._onDidChangeConfiguration.fire();
+        config._onDidChangeConfiguration.fire(undefined);
       }));
     }
     return config;
@@ -153,10 +201,22 @@ export class QueryServerConfigListener extends ConfigListener implements QuerySe
     return this._codeQlPath;
   }
 
+  public get customLogDirectory(): string | undefined {
+    return CUSTOM_LOG_DIRECTORY_SETTING.getValue<string>() || undefined;
+  }
+
   public get numThreads(): number {
     return NUMBER_OF_THREADS_SETTING.getValue<number>();
   }
 
+  public get saveCache(): boolean {
+    return SAVE_CACHE_SETTING.getValue<boolean>();
+  }
+
+  public get cacheSize(): number {
+    return CACHE_SIZE_SETTING.getValue<number | null>() || 0;
+  }
+
   /** Gets the configured query timeout, in seconds. This looks up the setting at the time of access. */
   public get timeoutSecs(): number {
     return TIMEOUT_SETTING.getValue<number | null>() || 0;
@@ -168,7 +228,7 @@ export class QueryServerConfigListener extends ConfigListener implements QuerySe
       return undefined;
     }
     if (memory == 0 || typeof (memory) !== 'number') {
-      logger.log(`Ignoring value '${memory}' for setting ${MEMORY_SETTING.qualifiedName}`);
+      void logger.log(`Ignoring value '${memory}' for setting ${MEMORY_SETTING.qualifiedName}`);
       return undefined;
     }
     return memory;
@@ -178,10 +238,6 @@ export class QueryServerConfigListener extends ConfigListener implements QuerySe
     return DEBUG_SETTING.getValue<boolean>();
   }
 
-  public get onDidChangeQueryServerConfiguration(): Event<void> {
-    return this._onDidChangeConfiguration.event;
-  }
-
   protected handleDidChangeConfiguration(e: ConfigurationChangeEvent): void {
     this.handleDidChangeConfigurationForRelevantSettings(QUERY_SERVER_RESTARTING_SETTINGS, e);
   }
@@ -192,11 +248,84 @@ export class QueryHistoryConfigListener extends ConfigListener implements QueryH
     this.handleDidChangeConfigurationForRelevantSettings(QUERY_HISTORY_SETTINGS, e);
   }
 
-  public get onDidChangeQueryHistoryConfiguration(): Event<void> {
-    return this._onDidChangeConfiguration.event;
-  }
-
   public get format(): string {
     return QUERY_HISTORY_FORMAT_SETTING.getValue<string>();
   }
 }
+
+export class CliConfigListener extends ConfigListener implements CliConfig {
+  public get additionalTestArguments(): string[] {
+    return ADDITIONAL_TEST_ARGUMENTS_SETTING.getValue();
+  }
+
+  public get numberTestThreads(): number {
+    return NUMBER_OF_TEST_THREADS_SETTING.getValue();
+  }
+
+  public get numberThreads(): number {
+    return NUMBER_OF_THREADS_SETTING.getValue<number>();
+  }
+
+  public get maxPaths(): number {
+    return MAX_PATHS.getValue<number>();
+  }
+
+  protected handleDidChangeConfiguration(e: ConfigurationChangeEvent): void {
+    this.handleDidChangeConfigurationForRelevantSettings(CLI_SETTINGS, e);
+  }
+}
+
+// Enable experimental features
+
+/**
+ * Any settings below are deliberately not in package.json so that
+ * they do not appear in the settings ui in vscode itself. If users
+ * want to enable experimental features, they can add them directly in
+ * their vscode settings json file.
+ */
+
+/**
+ * Enables canary features of this extension. Recommended for all internal users.
+ */
+export const CANARY_FEATURES = new Setting('canary', ROOT_SETTING);
+
+export function isCanary() {
+  return !!CANARY_FEATURES.getValue<boolean>();
+}
+
+/**
+ * Avoids caching in the AST viewer if the user is also a canary user.
+ */
+export const NO_CACHE_AST_VIEWER = new Setting('disableCache', AST_VIEWER_SETTING);
+
+// Settings for remote queries
+const REMOTE_QUERIES_SETTING = new Setting('remoteQueries', ROOT_SETTING);
+
+/**
+ * Lists of GitHub repositories that you want to query remotely via the "Run Remote query" command.
+ * Note: This command is only available for internal users.
+ * 
+ * This setting should be a JSON object where each key is a user-specified name (string),
+ * and the value is an array of GitHub repositories (of the form `<owner>/<repo>`).
+ */
+const REMOTE_REPO_LISTS = new Setting('repositoryLists', REMOTE_QUERIES_SETTING);
+
+export function getRemoteRepositoryLists(): Record<string, string[]> | undefined {
+  return REMOTE_REPO_LISTS.getValue<Record<string, string[]>>() || undefined;
+}
+
+/**
+ * The name of the "controller" repository that you want to use with the "Run Remote query" command.
+ * Note: This command is only available for internal users.
+ *
+ * This setting should be a GitHub repository of the form `<owner>/<repo>`.
+ */
+const REMOTE_CONTROLLER_REPO = new Setting('controllerRepo', REMOTE_QUERIES_SETTING);
+
+export function getRemoteControllerRepo(): string | undefined {
+  return REMOTE_CONTROLLER_REPO.getValue<string>() || undefined;
+}
+
+export async function setRemoteControllerRepo(repo: string | undefined) {
+  await REMOTE_CONTROLLER_REPO.updateValue(repo, ConfigurationTarget.Global);
+}

extensions/ql-vscode/src/contextual/astBuilder.ts

@@ -0,0 +1,147 @@
+import { QueryWithResults } from '../run-queries';
+import { CodeQLCliServer } from '../cli';
+import { DecodedBqrsChunk, BqrsId, EntityValue } from '../pure/bqrs-cli-types';
+import { DatabaseItem } from '../databases';
+import { ChildAstItem, AstItem } from '../astViewer';
+import fileRangeFromURI from './fileRangeFromURI';
+
+/**
+ * A class that wraps a tree of QL results from a query that
+ * has an @kind of graph
+ */
+export default class AstBuilder {
+
+  private roots: AstItem[] | undefined;
+  private bqrsPath: string;
+  constructor(
+    queryResults: QueryWithResults,
+    private cli: CodeQLCliServer,
+    public db: DatabaseItem,
+    public fileName: string
+  ) {
+    this.bqrsPath = queryResults.query.resultsPaths.resultsPath;
+  }
+
+  async getRoots(): Promise<AstItem[]> {
+    if (!this.roots) {
+      this.roots = await this.parseRoots();
+    }
+    return this.roots;
+  }
+
+  private async parseRoots(): Promise<AstItem[]> {
+    const options = { entities: ['id', 'url', 'string'] };
+    const [nodeTuples, edgeTuples, graphProperties] = await Promise.all([
+      await this.cli.bqrsDecode(this.bqrsPath, 'nodes', options),
+      await this.cli.bqrsDecode(this.bqrsPath, 'edges', options),
+      await this.cli.bqrsDecode(this.bqrsPath, 'graphProperties', options),
+    ]);
+
+    if (!this.isValidGraph(graphProperties)) {
+      throw new Error('AST is invalid');
+    }
+
+    const idToItem = new Map<BqrsId, AstItem>();
+    const parentToChildren = new Map<BqrsId, BqrsId[]>();
+    const childToParent = new Map<BqrsId, BqrsId>();
+    const astOrder = new Map<BqrsId, number>();
+    const edgeLabels = new Map<BqrsId, string>();
+    const roots = [];
+
+    // Build up the parent-child relationships
+    edgeTuples.tuples.forEach(tuple => {
+      const [source, target, tupleType, value] = tuple as [EntityValue, EntityValue, string, string];
+      const sourceId = source.id!;
+      const targetId = target.id!;
+
+      switch (tupleType) {
+        case 'semmle.order':
+          astOrder.set(targetId, Number(value));
+          break;
+
+        case 'semmle.label': {
+          childToParent.set(targetId, sourceId);
+          let children = parentToChildren.get(sourceId);
+          if (!children) {
+            parentToChildren.set(sourceId, children = []);
+          }
+          children.push(targetId);
+
+          // ignore values that indicate a numeric order.
+          if (!Number.isFinite(Number(value))) {
+            edgeLabels.set(targetId, value);
+          }
+          break;
+        }
+
+        default:
+        // ignore other tupleTypes since they are not needed by the ast viewer
+      }
+    });
+
+    // populate parents and children
+    nodeTuples.tuples.forEach(tuple => {
+      const [entity, tupleType, value] = tuple as [EntityValue, string, string];
+      const id = entity.id!;
+
+      switch (tupleType) {
+        case 'semmle.order':
+          astOrder.set(id, Number(value));
+          break;
+
+        case 'semmle.label': {
+          // If an edge label exists, include it and separate from the node label using ':'
+          const nodeLabel = value ?? entity.label;
+          const edgeLabel = edgeLabels.get(id);
+          const label = [edgeLabel, nodeLabel].filter(e => e).join(': ');
+          const item = {
+            id,
+            label,
+            location: entity.url,
+            fileLocation: fileRangeFromURI(entity.url, this.db),
+            children: [] as ChildAstItem[],
+            order: Number.MAX_SAFE_INTEGER
+          };
+
+          idToItem.set(id, item);
+          const parent = idToItem.get(childToParent.has(id) ? childToParent.get(id)! : -1);
+
+          if (parent) {
+            const astItem = item as ChildAstItem;
+            astItem.parent = parent;
+            parent.children.push(astItem);
+          }
+          const children = parentToChildren.has(id) ? parentToChildren.get(id)! : [];
+          children.forEach(childId => {
+            const child = idToItem.get(childId) as ChildAstItem | undefined;
+            if (child) {
+              child.parent = item;
+              item.children.push(child);
+            }
+          });
+          break;
+        }
+
+        default:
+        // ignore other tupleTypes since they are not needed by the ast viewer
+      }
+    });
+
+    // find the roots and add the order
+    for (const [, item] of idToItem) {
+      item.order = astOrder.has(item.id)
+        ? astOrder.get(item.id)!
+        : Number.MAX_SAFE_INTEGER;
+
+      if (!('parent' in item)) {
+        roots.push(item);
+      }
+    }
+    return roots;
+  }
+
+  private isValidGraph(graphProperties: DecodedBqrsChunk) {
+    const tuple = graphProperties?.tuples?.find(t => t[0] === 'semmle.graphKind');
+    return tuple?.[1] === 'tree';
+  }
+}

extensions/ql-vscode/src/contextual/fileRangeFromURI.ts

@@ -0,0 +1,31 @@
+import * as vscode from 'vscode';
+
+import { UrlValue, LineColumnLocation } from '../pure/bqrs-cli-types';
+import { isEmptyPath } from '../pure/bqrs-utils';
+import { DatabaseItem } from '../databases';
+
+
+export default function fileRangeFromURI(uri: UrlValue | undefined, db: DatabaseItem): vscode.Location | undefined {
+  if (!uri || typeof uri === 'string') {
+    return undefined;
+  } else if ('startOffset' in uri) {
+    return undefined;
+  } else {
+    const loc = uri as LineColumnLocation;
+    if (isEmptyPath(loc.uri)) {
+      return undefined;
+    }
+    const range = new vscode.Range(Math.max(0, (loc.startLine || 0) - 1),
+      Math.max(0, (loc.startColumn || 0) - 1),
+      Math.max(0, (loc.endLine || 0) - 1),
+      Math.max(0, (loc.endColumn || 0)));
+    try {
+      if (uri.uri.startsWith('file:')) {
+        return new vscode.Location(db.resolveSourceFile(uri.uri), range);
+      }
+      return undefined;
+    } catch (e) {
+      return undefined;
+    }
+  }
+}