It's more trouble than it's worth, since AppVeyor only checks the HEAD commit of a PR rather than the full diff against the base branch to decide which files changed.
HOST_PYTHON: C:\Python36\python.exe
image:
- Visual Studio 2017
-
-# Only trigger AppVeyor if actual code or its configuration changes
-only_commits:
- files:
- - .github/appveyor.yml
- - .gitattributes
- - Grammar/
- - Include/
- - Lib/
- - Modules/
- - Objects/
- - PC/
- - PCbuild/
- - Parser/
- - Programs/
- - Python/
- - Tools/