slash-command-generate-changelog.yml

name: /generate-changelog handler

on:
  repository_dispatch:
    types: [generate-changelog-command]

permissions:
  pull-requests: write

concurrency: generate-changelog-handler-${{ github.event.client_payload.pull_request.node_id || github.run_id }}

jobs:
  changelog:
    if: github.event.client_payload.pull_request != null
    name: Generate changelog and comment

    runs-on: ubuntu-latest
    env:
      PR: ${{ github.event.client_payload.pull_request.number }}
    steps:
      - if: github.event.client_payload.pull_request.merge_commit_sha == null
        name: Report "No merge HEAD" found
        uses: peter-evans/create-or-update-comment@v4
        with:
          issue-number: ${{ env.PR }}
          body: |
            Could not generate changelog using this PR as no GitHub merge commits are available.

            This could be due to the PR being recently opened or there is a merge conflict. Please
            try again after a few minutes.

      - if: github.event.client_payload.pull_request.merge_commit_sha == null
        name: Fail due to "No merge HEAD"
        run: |
          echo "::error::No merge HEAD found for PR #$PR"
          exit 1

      - name: "Checkout merge head for #${{ env.PR }}"
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.client_payload.pull_request.merge_commit_sha }}
          sparse-checkout: |
            .github

      - id: changelog
        name: Create changelog
        uses: mikepenz/release-changelog-builder-action@v5
        with:
          configuration: ".github/changelog.json"
          fromTag: ${{ github.event.client_payload.slash_command.args.named.from || '' }}
          toTag: ${{ github.event.client_payload.slash_command.args.named.to || '' }}
          ignorePreReleases: ${{ github.event.client_payload.slash_command.args.named.no_prerelease || false }}

      - if: steps.changelog.outputs.failed == 'true'
        name: Report failure
        uses: peter-evans/create-or-update-comment@v4
        with:
          issue-number: ${{ env.PR }}
          body: |
            Error occurred while generating changelog using this PR.

            See run log at ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}.

      - if: steps.changelog.outputs.failed == 'true'
        name: Fail due to changelog
        run: |
          echo "::error::Error occurred while generating changelog using PR #$PR"
          exit 1

      - name: Comment with changelog
        uses: peter-evans/create-or-update-comment@v4
        with:
          issue-number: ${{ env.PR }}
          body: |
            Changelog requested by: @${{ github.event.client_payload.github.payload.comment.user.login }}

            Generated between ${{ steps.changelog.outputs.fromTag }} to ${{ steps.changelog.outputs.toTag }} using configuration provided by this PR.

            ---

            ${{ steps.changelog.outputs.changelog }}