name: GNU Commit Format Checker

on:
  pull_request:
    branches:
      - master
      - gcc-patch-dev
  merge_group:

jobs:
  check-commit-changelogs:
    runs-on: ubuntu-latest
    name: check-changelogs
    
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0

      - name: Install Deps
        run: |
          sudo apt-get update;
          sudo apt-get install -y \
            python3 \
            python3-git
      
      - name: GCC check PR Commits
        run: |
          if ${{ github.event_name == 'pull_request' }}; then
            python3 contrib/gcc-changelog/git_check_commit.py origin/${{ github.event.pull_request.base.ref }}..${{ github.event.pull_request.head.sha }}
          fi
            
  check-commit-prefixes:
    runs-on: ubuntu-latest
    name: check-gccrs-prefix
    if: ${{ github.base_ref == 'gcc-patch-dev' }} # master commits don't need the gccrs prefix
    
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0

      - name: Check for `gccrs` prefix
        run: |
          retval=0
          for commit in $(git rev-list origin/${{ github.event.pull_request.base.ref }}..${{ github.event.pull_request.head.sha }});
          do
            echo -n "Checking gccrs prefix for $commit: " >> results
            if [[ $(git log -1 --format="%s" $commit) = gccrs:* ]]; then
              echo "OK" >> results
            else
              retval=1
              echo "KO" >> results
            fi
          done
          exit $retval

  check-commit-signoff:
    runs-on: ubuntu-latest
    name: check-commit-signoff
    
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0

      - name: Check for DCO Sign-Off line/possible FSF Copyright Assignment
        run: |
          retval=0;
          rev_list="origin/${{ github.event.pull_request.base.ref }}..${{ github.event.pull_request.head.sha }}"

          for commit in $(git rev-list --reverse "$rev_list"); do
            echo -n "Checking for DCO Sign-Off for commit $commit... ";

            if [[ $(git log "$commit" -1 --format="%B" | tail -n 2) = Signed-off-by:* ]]; then
              echo "OK";
              continue;
            fi

            author=$(git log -1 --format=%an "$commit");

            if [[ "$(( $(git log --author="$author"|wc -l) - $(git log --author="$author" --grep='Signed-off-by'|wc -l )))" -ne 0 ]]; then
              echo "OK"
              echo "$author probably has FSF Copyright Assignment. Check manually that the lack of DCO Sign-Off is allowed."
            else
              echo "KO"
              retval=1;
            fi
          done;

          ## check no Signed-off-by in the middle.
          while read -r f; do
            echo -n "$f : "
               if awk 'BEGIN { in_footer = 0; error = 0;}
                       { DEFAULT = 1; }
                       /^(Signed-off|Co-authored|Reviewed|Tested)-by/ { in_footer = 1; DEFAULT = 0;}
                       /^\s*$/  { DEFAULT = 0; }
                       DEFAULT { if (in_footer == 1) { printf $0 " appears after some Signed-off-by/Co-authored-by/Tested-by/Reviewed-by line "; error = 1; exit (1);} }';
               then
                   echo OK
               else
                   echo KO
                   retval=1
               fi < <(git log "$f" -1 --format="%B")
          done < <(git rev-list --reverse "$rev_list" )

          exit $retval;

  check-issue-reference:
    runs-on: ubuntu-latest
    continue-on-error: true # We do not want to block merge if it is a legitimate GCC bugzilla reference.
    name: check-issue-reference

    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0

      - name: Check for issue number reference in commit messages
        run: |
          retval=0;
          rev_list="origin/${{ github.event.pull_request.base.ref }}..${{ github.event.pull_request.head.sha }}"
          for commit in $(git rev-list --reverse "$rev_list"); do
            if [ "$(git log --format=%B -n 1 \"$commit\" | grep '#[0-9]*' | grep -v -i 'Rust-GCC/gccrs#[0-9]*' | wc -l)" -ne 0 ]; then
              echo "$commit: KO"
              retval=1
            else
              echo "$commit: OK"
            fi
          done;
          if [ "$retval" -ne 0 ]; then
            echo "Some raw issue references were found (eg. #4242)."
            echo "You shall rewrite the faulty commit message with this format: Rust-GCC/gccrs#4242"
            echo "You may ignore this CI step if it represents a valid GCC bugzilla or external repository reference instead."
          fi
          exit $retval;