* AST Sample for C++ Source
  Create dot output from query and db, and then get a rendered graph in SVG.

  #+BEGIN_SRC sh
    # 
    export PATH=$HOME/local/vmsync/codeql250:"$PATH"

    # Build db
    cd ~/w/codeql-cpp/src/
    codeql database create -j8 -v --language=cpp --command="clang example.cpp" -s . example.db

    # Edit printast.ql in editor to select function

    # Create dot graph 
    cd ~/w/codeql-cpp/queries/
    codeql database analyze                         \
           ~/w/codeql-cpp/src/example.db/           \
           ~/w/codeql-cpp/queries/printast.ql       \
           -j8 -v --ram=16000                       \
           --format=dot                             \
           --output=printast.dot

    # Query produced .dot file
    cd ~/w/codeql-cpp/
    ls queries/printast.dot/cpp/print-ast.dot

    # Query produced .bqrs file
    ls src/example.db/results/ast-queries-cpp/printast.bqrs 

    # Generate SVG
    cd ~/w/codeql-cpp/queries/printast.dot/cpp
    dot -Tsvg < ./print-ast.dot > ./print-ast.svg
    open -a safari ./print-ast.svg

  #+END_SRC

  #+CAPTION: AST graph from dot
  #+NAME:   fig:graph-ast-1
  [[./queries/printast.dot/cpp/print-ast.svg]]