check-merge-commit.yml

# moon: The build system and package manager for MoonBit.
# Copyright (C) 2024 International Digital Economy Academy
#
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# GNU Affero General Public License for more details.
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name: Check for Merge Commits

on:
  pull_request:
    branches: main

jobs:
  check-merge-commit:
    runs-on: ubuntu-latest

    steps:
    - name: Check out the repository
      uses: actions/checkout@v4
  
    - name: Get all commit messages
      id: get-commit-messages
      uses: actions/github-script@v7
      with:
        script: |
          const prNumber = context.payload.pull_request.number;
          const commits = await github.rest.pulls.listCommits({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: prNumber,
              per_page: 100
          });
          const commitMessages = commits.data.map(commit => commit.commit.message);
          const hasMergeCommit = commitMessages.some(message => message.startsWith('Merge branch') || message.startsWith('Merge pull request'));
          if (hasMergeCommit) {
              core.setFailed('Pull request contains merge commit(s).');
          }

    - name: Check for merge commits
      if: failure()
      run: echo "This pull request contains merge commit(s) and has been marked as failed."