name: Awesome CI Workflow

on: [push, pull_request]
#   push:
#     branches: [ master ]
#   pull_request:
#     branches: [ master ]

jobs:
  MainSequence:
    name: Code Formatter
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v1 # v2 is broken for git diff
      - uses: actions/setup-python@v2
      - name: requirements
        run: |
          sudo apt -qq -y update
          sudo apt -qq install clang-tidy-10
      - name: Setup Git Specs
        run: |
          git config --global user.name github-actions
          git config --global user.email '${GITHUB_ACTOR}@users.noreply.github.com'
          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
      - name: Filename Formatter
        run: |
          IFS=$'\n'
          for fname in `find . -type f -name '*.c' -o -name '*.h'`
          do
            echo "${fname}"
            new_fname=`echo ${fname} | tr ' ' '_'`
            echo "      ${new_fname}"
            new_fname=`echo ${new_fname} | tr 'A-Z' 'a-z'`
            echo "      ${new_fname}"
            new_fname=`echo ${new_fname} | tr '-' '_'`
            echo "      ${new_fname}"
            if [ ${fname} != ${new_fname} ]
            then
              echo "      ${fname} --> ${new_fname}"
              git "mv" "${fname}" ${new_fname}
            fi
          done
          git commit -am "formatting filenames $GITHUB_SHA" ||  true
      - name: Update DIRECTORY.md
        shell: python
        run: |
          import os
          from typing import Iterator

          URL_BASE = "https://github.com/TheAlgorithms/C/blob/master"
          g_output = []

          def good_filepaths(top_dir: str = ".") -> Iterator[str]:
              cpp_exts = tuple(".c .c++ .cc .cpp .cu .cuh .cxx .h .h++ .hh .hpp .hxx".split())
              for dirpath, dirnames, filenames in os.walk(top_dir):
                  dirnames[:] = [d for d in dirnames if d[0] not in "._"]
                  for filename in filenames:
                      if os.path.splitext(filename)[1].lower() in cpp_exts:
                          yield os.path.join(dirpath, filename).lstrip("./")

          def md_prefix(i):
              return f"{i * '  '}*" if i else "\n##"

          def print_path(old_path: str, new_path: str) -> str:
              global g_output
              old_parts = old_path.split(os.sep)
              for i, new_part in enumerate(new_path.split(os.sep)):
                  if i + 1 > len(old_parts) or old_parts[i] != new_part:
                      if new_part:
                          g_output.append(f"{md_prefix(i)} {new_part.replace('_', ' ').title()}")
              return new_path

          def build_directory_md(top_dir: str = ".") -> str:
              global g_output
              old_path = ""
              for filepath in sorted(good_filepaths(), key=str.lower):
                  filepath, filename = os.path.split(filepath)
                  if filepath != old_path:
                      old_path = print_path(old_path, filepath)
                  indent = (filepath.count(os.sep) + 1) if filepath else 0
                  url = "/".join((URL_BASE, filepath, filename)).replace(" ", "%20")
                  filename = os.path.splitext(filename.replace("_", " ").title())[0]
                  g_output.append(f"{md_prefix(indent)} [{filename}]({url})")
              return "# List of all files\n" + "\n".join(g_output)

          with open("DIRECTORY.md", "w") as out_file:
              out_file.write(build_directory_md(".") + "\n")
      - name: Commit DIRECTORY.md
        run: |
          git diff DIRECTORY.md
          git add DIRECTORY.md
          git commit -m "updating DIRECTORY.md" ||  true
      - name: Get file changes
        run: |
          git remote -v
          git branch
          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
          git diff --diff-filter=dr --name-only origin/master > git_diff.txt
          echo "Files changed-- `cat git_diff.txt`"
      - name: Configure for static lint checks
        # compiling first gives clang-tidy access to all the header files and settings used to compile the programs.
        # This will check for macros, if any, on linux and not for Windows. But the use of portability checks should
        # be able to catch any errors for other platforms.
        run: cmake -B build -S . -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
      - name: Lint modified files
        shell: python
        run: |
          import os
          import subprocess
          import sys

          print("Python {}.{}.{}".format(*sys.version_info))  # Python 3.8
          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(f"{len(cpp_files)} C++ files were modified.")
          if not cpp_files:
            sys.exit(0)

          subprocess.run(["clang-tidy-10", "-p=build", *cpp_files, "--"],
              check=True, text=True, stderr=subprocess.STDOUT)
          # for cpp_file in cpp_files:
          #   subprocess.run(["clang-tidy-10", "-p=build", cpp_file, "--"],
          #     check=True, text=True, stderr=subprocess.STDOUT)

          # print("g++:")
          # compile_exts = tuple(".c .c++ .cc .cpp .cu .cxx".split())
          # compile_files = [file for file in cpp_files if file.lower().endswith(compile_exts)]
          # for cpp_file in cpp_files:
          #   subprocess.run(["g++", cpp_file], check=True, text=True)

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

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

          nodir_files = [file for file in cpp_files if file.count(os.sep) != 1]
          if nodir_files:
            print(f"{len(nodir_files)} files are not in one and only one directory:")
            print("\n".join(nodir_files) + "\n")

          bad_files = len(upper_files + space_files + nodir_files)
          if bad_files:
            sys.exit(bad_files)
      - name: Commit and push changes
        run: |
          git commit -am "clang-tidy fixes for $GITHUB_SHA" ||  true
          git push --force origin HEAD:$GITHUB_REF || true

  build:
    name: Compile checks
    runs-on: ${{ matrix.os }}
    needs: [MainSequence]
    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest, macOS-latest]
    steps:
      - uses: actions/checkout@master
        with:
          submodules: true
      - run: cmake -B ./build -S .
      - run: cmake --build build