check-if-merged-pr.yml

name: Check if the commit is part of a merged PR

on:
  workflow_call:
    outputs:
      is_merged_pr:
        description: "Whether the current push came from a merged PR"
        value: ${{ jobs.check-pr.outputs.is_merged_pr }}
      pr_head_sha:
        description: "The head SHA of the merged PR"
        value: ${{ jobs.check-pr.outputs.pr_head_sha }}

jobs:
  check-pr:
    runs-on: ubuntu-latest
    outputs:
      is_merged_pr: ${{ steps.parse-check-pr.outputs.is_merged_pr }}
      pr_head_sha: ${{ steps.parse-check-pr.outputs.pr_head_sha }}
    steps:
      - name: Check if this commit is from a merged PR
        id: check-pr
        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
        with:
          result-encoding: string
          script: |
            const commitSha = context.sha;
            const { data: prs } = await github.rest.repos.listPullRequestsAssociatedWithCommit({
              owner: context.repo.owner,
              repo: context.repo.repo,
              commit_sha: commitSha
            });

            if (!prs.length) {
              core.info('No PRs associated with this commit.');
              return JSON.stringify({ is_merged_pr: false, pr_head_sha: '' });
            }

            const mergedPr = prs.find(pr => pr.merged_at !== null);
      
            if (!mergedPr) {
              core.info('PRs found, but none were merged.');
              return JSON.stringify({ is_merged_pr: false, pr_head_sha: '' });
            }

            core.info(`Found merged PR head SHA: ${mergedPr.head.sha}`);
            return JSON.stringify({ is_merged_pr: true, pr_head_sha: mergedPr.head.sha });

      - name: Parse outputs
        id: parse-check-pr
        shell: bash
        run: |
          echo "Parsing result: ${{ steps.check-pr.outputs.result }}"
          echo "is_merged_pr=$(jq -r '.is_merged_pr' <<< '${{ steps.check-pr.outputs.result }}')" >> $GITHUB_OUTPUT
          echo "pr_head_sha=$(jq -r '.pr_head_sha' <<< '${{ steps.check-pr.outputs.result }}')" >> $GITHUB_OUTPUT