name: cpplint_modified_files
on: [push, pull_request]
jobs:
  cpplint_modified_files:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v1
      - uses: actions/setup-python@v1
      - run: python -m pip install cpplint
      - run: git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
      - run: git diff origin/master --name-only > git_diff.txt
      - name: cpplint_modified_files
        shell: python
        run: |
          import os
          import subprocess
          import sys

          print("Python {}.{}.{}".format(*sys.version_info))  # legacy Python :-(
          with open("git_diff.txt") as in_file:
            modified_files = sorted(in_file.read().splitlines())
          print("{} files were modified.".format(len(modified_files)))

          cpp_exts = tuple(".c .c++ .cc .cpp .cu .cuh .cxx .h .h++ .hh .hpp .hxx".split())
          cpp_files = [file for file in modified_files if file.lower().endswith(cpp_exts)]
          print("{} C++ files were modified.".format(len(cpp_files)))
          if not cpp_files:
            sys.exit(0)

          print("cpplint:")
          print(subprocess.check_output(["cpplint"] + cpp_files).decode("utf-8"))

          upper_files = [file for file in cpp_files if os.path.basename(file) != os.path.basename(file).lower()]
          if upper_files:
            print("{} files contain uppercase characters:".format(len(upper_files)))
            print("\n".join(upper_files) + "\n")

          space_files = [file for file in cpp_files if " " in os.path.basename(file) or "-" in file]
          if space_files:
            print("{} files contain space or dash characters:".format(len(space_files)))
            print("\n".join(space_files) + "\n")

          nodir_files = [file for file in cpp_files if os.sep not in file]
          if nodir_files:
            print("{} files are not in a directory:".format(len(nodir_files)))
            print("\n".join(nodir_files) + "\n")

          bad_files = len(upper_files + space_files + nodir_files)
          if bad_files:
            sys.exit(bad_files)