pre-commit.yml

name: pre-commit check

# Based on our old pre-commit check and the official action:
# https://github.com/pre-commit/action

on:
  workflow_call:
    inputs:
      args:
        default: "--all-files --show-diff-on-failure"
        description: "Additional flags for pre-commit"
        required: false
        type: string
      annotate:
        default: true
        description: "Use the problem matcher to annotate the PR diff"
        required: false
        type: boolean

jobs:
  pre-commit:
    runs-on: [ubuntu-20.04, self-hosted]

    steps:
    - uses: actions/checkout@v4

    - name: Configure the matcher to annotate the diff
      if: ${{ inputs.annotate }}
      run: |
        # Ref: https://github.com/actions/toolkit/blob/main/docs/problem-matchers.md
        cat > "$HOME/flake8_problem_matcher.json" <<'EOF'
        {
            "problemMatcher": [
                {
                    "owner": "flake8_error",
                    "severity": "error",
                    "pattern": [
                        {
                            "regexp": "^(.+):(\\d+):(\\d+): (E\\d+) (.+)$",
                            "file": 1,
                            "line": 2,
                            "column": 3,
                            "code": 4,
                            "message": 5
                        }
                    ]
                },
                {
                    "owner": "flake8_warning",
                    "severity": "warning",
                    "pattern": [
                        {
                            "regexp": "^(.+):(\\d+):(\\d+): (W\\d+) (.+)$",
                            "file": 1,
                            "line": 2,
                            "column": 3,
                            "code": 4,
                            "message": 5
                        }
                    ]
                }
            ]
        }
        EOF
        echo "::add-matcher::$HOME/flake8_problem_matcher.json"

    - name: Install pre-commit
      run: |
        python -m pip install pre-commit

    - name: List Python package versions
      run: |
        python -m pip freeze --local

    - name: Check for pre-commit configuration
      run: |
        if [ ! -f ".pre-commit-config.yaml" ]; then
          echo "::error::No pre-commit configuration found!"
          exit 1
        fi

    - name: Switch to temporary branch
      run: |
        # This is to avoid no-commit-to-branch from failing us when this is run
        # on master.
        git checkout -b _pre_commit_check_branch

    - name: Check pre-commit usage
      run: |
        pre-commit run \
          --show-diff-on-failure \
          --color=always \
          ${{ inputs.args }}