lint-PR-title.yml

name: Lint Pull Request Title

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

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - uses: actions-ecosystem/action-regex-match@v2
        id: regex-match
        with:
          text: ${{ github.event.pull_request.title }}
          regex: '(?:build|chore|ci|docs|feat|fix|perf|refactor|revert|style|add|update|task|chore|test)\([a-z-A-Z-0-9]+\):\s.+'

      - uses: actions-ecosystem/action-create-comment@v1
        if: ${{ steps.regex-match.outputs.match == '' }}
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          body: |
            :warning: The title of this PR is invalid.
            Please make the title match this format `<type>(<scope>): <description>`.
            e.g.) 
            `add(cli): enable --verbose flag`
            `fix(api): avoid unexpected error in handler`

            allowed types - add, update, task, chore, feat, test, fix
      - run: exit 1
        if: ${{ steps.regex-match.outputs.match == '' }}