checkpr.yml

name: Check PR

on:
  pull_request_target:
    types: [opened]

jobs:
  check:
    runs-on: ubuntu-latest
    env:
      PR_NUMBER: ${{github.event.number}}

    steps:
      - name: Get PR info
        id: pr_info
        run: |
          content=`curl -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/${GITHUB_REPOSITORY}/pulls/${PR_NUMBER}`
          # the following lines are only required for multi line json
          content="${content//'%'/'%25'}"
          content="${content//$'\n'/'%0A'}"
          content="${content//$'\r'/'%0D'}"
          # end of optional handling for multi line json
          echo "::set-output name=json::$content"
          
      - name: Check draft
        if: "${{!startsWith(fromJson(steps.pr_info.outputs.json).title,'WIP') && !fromJson(steps.pr_info.outputs.json).draft}}"
        uses: mshick/add-pr-comment@v1
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          repo-token-user-login: 'github-actions[bot]'
          message: |
            Please mark your pull request as draft until it is finished: https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/changing-the-stage-of-a-pull-request#converting-a-pull-request-to-a-draft
            
      - name: Check title
        if: "${{contains(fromJson(steps.pr_info.outputs.json).title, 'commit')}}"
        uses: mshick/add-pr-comment@v1
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          repo-token-user-login: 'github-actions[bot]'
          message: |
            Please add a meaningful title to your pull request.
            
      - name: Check body
        if: "${{fromJson(steps.pr_info.outputs.json).body == null}}"
        uses: mshick/add-pr-comment@v1
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          repo-token-user-login: 'github-actions[bot]'
          message: |
            Please add a description to your pull request.