check-changelog.yaml

name: Check changelog

on:
  pull_request:
    types:
      - opened
      - synchronize
      - labeled
      - unlabeled

jobs:
  check-changelog:
    runs-on: ubuntu-latest
    steps:
      - name: 📥 Checkout repository
        uses: actions/checkout@v3.3.0

      - name: 🧰 Find Changed Files in changelog.d
        id: changed-files
        uses: tj-actions/changed-files@v35
        with:
          files: './changelog.d/**'

      - name: 🔨 Enforce New File or 'No Changelog Required' Label
        uses: actions/github-script@v6
        # Don't require changelogs for draft PRs:
        if: github.event.pull_request.draft == false
        with:
          script: | 
            function shouldCheckChangelog() {
              return !${{ contains(github.event.pull_request.labels.*.name, 'No Changelog Required') }}
            }

            function getNewChangelogFiles() {
              const newFiles = '${{ steps.changed-files.outputs.added_files }}'.trim().split(' ')
              // We check that added_files is the singleton array containing the empty string.
              // This is probably a bug in tj-actions/changed-files
              return newFiles.length === 1 && newFiles[0] === "" ? [] : newFiles
            }

            function checkChangelog() {
              const newFiles = getNewChangelogFiles()
              if (newFiles.length === 0) {
                core.info("No files were added by this PR in any of the **/changelog.d directories.")
                core.info("Either commit a new file, or add the label 'No Changelog Required' to your PR.")
                core.setFailed("Changelog check failed.")
              } else
                core.info(`The following changelog files were added by this PR:\n${newFiles}`)
            }

            if (shouldCheckChangelog())
              checkChangelog()
            else
              core.info("PR contains the label 'No Changelog Required', skipping changelog check.")