lint-pr-title.yml

name: Lint Pull Request Title

on:
    pull_request:
        types:
            - opened
            - edited
            - reopened

jobs:
    lint:
        runs-on: ubuntu-latest
        permissions:
            checks: write
            pull-requests: write
            contents: write
            issues: read
        steps:
            - uses: actions/checkout@v4.2.2

            - uses: actions-ecosystem/action-regex-match@v2.0.2
              id: regex-match
              with:
                  text: ${{ github.event.pull_request.title }}
                  regex: '(?:add|update|task|chore|feat|fix|refactor)\([a-z-A-Z]+\):\s.+'

            - uses: mshick/add-pr-comment@v2.8.2
              if: ${{ steps.regex-match.outputs.match == '' }}
              with:
                  github_token: ${{ secrets.GITHUB_TOKEN }}
                  message: |
                      :warning: The title of this PR is invalid.
                      Please make the title match the regex `(?:add|update|task|chore|feat|fix|refactor)\([a-z-A-Z]+\):\s.+`.
                      e.g.) `add(cli): enable --verbose flag`, `fix(api): avoid unexpected error in handler`

            - name: Add invalid PR title label if regex is not matching
              if: ${{ steps.regex-match.outputs.match == '' }}
              uses: buildsville/add-remove-label@v2.0.1
              with:
                  token: ${{ secrets.GITHUB_TOKEN }}
                  labels: |
                      Invalid PR title
                  type: add

            - name: Remove label if regex is matching
              if: ${{ steps.regex-match.outputs.match != '' }}
              uses: buildsville/add-remove-label@v2.0.1
              with:
                  token: ${{ secrets.GITHUB_TOKEN }}
                  labels: |
                      Invalid PR title
                  type: remove

            - run: exit 1
              if: ${{ steps.regex-match.outputs.match == '' }}