label-issues-on-pr-close.yml

name: Label Issues on PR Close

on:
  pull_request:
    types: [closed]

jobs:
  add-label:
    runs-on: ubuntu-latest

    steps:
    - name: Checkout repository
      uses: actions/checkout@v2

    - name: Add label to linked issues
      uses: actions/github-script@v6
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }}
        script: |
          const pr = context.payload.pull_request;
          if (pr.merged) {
            const issueNumbers = [];
            const regex = /\b(fix(es)?|close(s)?)\s+#(\d+)(,?\s*#\d+)*/gi;
            let match;
            while ((match = regex.exec(pr.body)) !== null) {
              const issues = match[0].match(/#\d+/g).map(issue => issue.substring(1));
              issueNumbers.push(...issues);
            }
            for (const issueNumber of issueNumbers) {
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issueNumber,
                labels: ["Status: Completed"]
              });
            }
          }