release-please-mention-contributors.yml

on:
  pull_request:
    paths:
      - CHANGELOG.md

name: "release-please: mention contributors"
jobs:
  mention-contributors:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - uses: actions/github-script@v6
        id: find-authors
        with:
          script: |
            const { stdout: diff } = await exec.getExecOutput("git diff origin/${{ github.base_ref }} -U0 CHANGELOG.md")
            console.log({ diff })

            const COMMIT_URL_REGEX = /\/commit\/(\w+)\)/g

            const matches = [...diff.matchAll(COMMIT_URL_REGEX)]
            const authors = (await Promise.all(matches.map(async match => {
              const ref = match[1]
              const [owner, repo] = "${{ github.repository }}".split("/")
              const commit = await github.rest.repos.getCommit({ owner, repo, ref })
              return commit.data.author?.login
            }))).filter(Boolean)

            console.log({ authors })
            core.setOutput('authors', authors.map(login => "@" + login).join(", "))

      - name: Find existing comment
        uses: peter-evans/find-comment@v2
        id: existing-comment
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: "github-actions[bot]"
          body-includes: "This contains contributions by "

      - name: Create or update comment
        uses: peter-evans/create-or-update-comment@v2
        with:
          comment-id: ${{ steps.existing-comment.outputs.comment-id }}
          issue-number: ${{ github.event.pull_request.number }}
          body: |
            This contains contributions by ${{ steps.find-authors.outputs.authors }}.
            Release by merging this PR.
          edit-mode: replace