QGIS/.github/workflows/pre-commit.yaml

name: Pre-commit checks

on:
  pull_request_target:
  push:
    branches:
      - master
      - release-*
  issue_comment:
    types: [created]

jobs:
  pre-commit:
    if: github.event_name != 'issue_comment' || github.event.comment.body == '/fix-precommit'
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
      contents: write
      issues: write

    steps:
      - uses: actions/checkout@v5
        with:
          fetch-depth: 200

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
            python-version: '3.13'

      - name: Install pre-commit
        run: pip install pre-commit

      - name: Run pre-commit
        run: |
            if [ "${{ github.event_name }}" == "pull_request_target" ]; then
              git fetch origin ${{ github.event.pull_request.base.ref }}:refs/remotes/origin/${{ github.event.pull_request.base.ref }}
              git fetch origin pull/${{ github.event.pull_request.number }}/head:pr-head
              MODIFIED_FILES=($(git diff --name-only origin/${{ github.event.pull_request.base.ref }} pr-head))
            elif [ "${{ github.event_name }}" == "push" ]; then
              MODIFIED_FILES=($(git diff --name-only ${{ github.event.before }} ${{ github.sha }}))
            else
              echo "Unsupported event: ${{ github.event_name }}"
              exit 1
            fi
            echo "Modified files: ${MODIFIED_FILES[@]}"
            pre-commit run --files ${MODIFIED_FILES[@]} || (echo "pre-commit failed. Attempting to auto-fix..." && exit 1)

      - name: Commit fixes
        if: failure()
        run: |
            git config --global user.name "github-actions[bot]"
            git config --global user.email "github-actions[bot]@users.noreply.github.com"
            git add .
            git commit -m "auto-fix pre-commit issues" || echo "No changes to commit"

      - name: Auto-commit fixes
        if: failure() && github.event_name == 'push'
        run: git push || echo "Failed to push changes. Please check permissions or conflicts."

      - name: Push fixes to new branch
        if: failure() && github.event_name == 'issue_comment' && github.event.comment.body == '/fix-precommit' && github.event.issue.pull_request
        run: |
              git checkout -b fix/pre-commit-${{ github.event.pull_request.head.sha }}
              git push origin fix/pre-commit-${{ github.event.pull_request.head.sha }}

      - name: Listen for `/fix-precommit` comment
        if: failure() && github.event_name == 'issue_comment' && github.event.comment.body == '/fix-precommit' && github.event.issue.pull_request
        uses: actions/github-script@v7
        with:
            github-token: ${{ secrets.GITHUB_TOKEN }}
            script: |
                const forkOwner = context.payload.pull_request.head.repo.owner.login;
                const forkRepo = context.payload.pull_request.head.repo.name;
                const forkBranch = context.payload.pull_request.head.ref;
                const baseRepoOwner = context.repo.owner;
                const baseRepoName = context.repo.repo;
                const headBranch = `fix/pre-commit-${context.payload.pull_request.head.sha}`;

                await github.rest.pulls.create({
                    owner: forkOwner,
                    repo: forkRepo,
                    title: "Auto-fix: Pre-commit issues",
                    head: `${baseRepoOwner}:${headBranch}`,
                    base: forkBranch,
                    body: "This PR attempts to fix pre-commit issues automatically.",
                });

      - name: Comment on PR if pre-commit failed
        if: failure() && github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number
            });

            const existingComment = comments.find(comment => comment.body.includes("⚠️ Pre-commit checks failed."));
            if (!existingComment) {
              await github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: "⚠️ Pre-commit checks failed. You can fix issues locally by running `pre-commit run --all-files`. Alternatively, comment `/fix-precommit` on this pull request, and I will attempt to auto-fix and open a new pull request for you."
              });
            }