Swift: autopep8 all python files

Additionally set up a pre-commit hook and a CI check for that.

.github/workflows/swift-codegen.yml

@@ -15,14 +15,18 @@ jobs:
       - uses: actions/checkout@v3
       - uses: ./.github/actions/fetch-codeql
       - uses: bazelbuild/setup-bazelisk@v2
+      - uses: actions/setup-python@v3
+      - uses: pre-commit/action@v3.0.0
+        name: Check that python code is properly formatted
+        with:
+          extra_args: autopep8 --all-files
       - name: Run unit tests
         run: |
           bazel test //swift/codegen/test --test_output=errors
-      - name: Check that QL generated code was checked in
-        run: |
-          bazel run //swift/codegen
-          git add swift
-          git diff --exit-code HEAD
+      - uses: pre-commit/action@v3.0.0
+        name: Check that QL generated code was checked in
+        with:
+          extra_args: swift-codegen --all-files
       - name: Generate C++ files
         run: |
           bazel run //swift/codegen:codegen -- --generate=trap,cpp --cpp-output=$PWD/swift-generated-headers

.pre-commit-config.yaml

@@ -15,6 +15,12 @@ repos:
       - id: clang-format
         files: ^swift/.*\.(h|c|cpp)$
 
+  - repo: https://github.com/pre-commit/mirrors-autopep8
+    rev: v1.6.0
+    hooks:
+      - id: autopep8
+        files: ^swift/codegen/.*\.py
+
   - repo: local
     hooks:
       - id: codeql-format

swift/codegen/.pep8

@@ -0,0 +1,2 @@
+[pep8]
+max_line_length = 120

swift/codegen/test/test_schema.py

@@ -266,7 +266,6 @@ A:
 """)
 
 
-
 def test_class_with_pragmas(load):
     ret = load("""
 A:

swift/codegen/test/test_trapgen.py

@@ -125,6 +125,7 @@ def test_one_table_overridden_underscore_named_field(generate_traps):
         cpp.Trap("foos", name="Foos", fields=[cpp.Field("whatever", "bar")]),
     ]
 
+
 def test_one_table_no_tags(generate_tags):
     assert generate_tags([
         dbscheme.Table(name="foos", columns=[dbscheme.Column("bla", "int")]),

swift/integration-tests/cross-references/test.py

@@ -4,4 +4,3 @@ run_codeql_database_create([
  'swift package clean',
  'swift build'
 ], lang='swift')
-