auto-pr-merge.yml

name: Auto-merge PRs to Contributors.md

on:
  pull_request_target:
    types: [opened, synchronize]
    paths:
      - 'Contributors.md'  # Only trigger if Contributors.md is changed

jobs:
  auto-merge:
    runs-on: ubuntu-latest
    permissions:
      contents: write  # Allow merging
      pull-requests: write  # Allow PR actions
      issues: write  # Allow posting comments

    steps:
      # Checkout the repository code
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 2

      # Get list of files changed in the pull request
      - name: Check if only Contributors.md was changed
        id: check_files
        run: |
          PR_FILES=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
            "https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/files" | jq -r '.[].filename')

          echo "Files changed in this PR: $PR_FILES"

          # Check if the only file changed is Contributors.md
          if [[ "$PR_FILES" == "Contributors.md" ]]; then
            echo "only_contributors=true" >> $GITHUB_ENV
          else
            echo "only_contributors=false" >> $GITHUB_ENV
          fi

      # Merge the PR if only Contributors.md was changed
      - name: Merge PR
        id: merge_pr
        if: env.only_contributors == 'true'
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const pull_number = context.payload.pull_request.number;

            // Try to merge the pull request using the squash method
            const response = await github.rest.pulls.merge({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: pull_number,
              merge_method: "squash"
            });

            if (response.status === 200) {
              console.log(`Pull request #${pull_number} merged successfully.`);
            } else {
              throw new Error(`Failed to merge pull request #${pull_number}.`);
            }

      # Post a congratulatory comment after the PR is merged
      - name: Post comment after merge
        if: steps.merge_pr.conclusion == 'success'
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const user = context.payload.pull_request.user.login;
            const message = `🎉 Hello @${user}, thank you for your contribution! Your pull request has been successfully merged! 🎉\n\nWe appreciate your effort in improving the project. Feel free to contribute again in the future!\n 😊`;

            // Post the comment on the PR
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: message
            });

      # Post a comment if the PR was not merged because other files were changed
      - name: Post comment if not merged
        if: env.only_contributors != 'true'
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const pull_number = context.payload.pull_request.number;
            const user = context.payload.pull_request.user.login;

            const message = `Hello @${user}, thank you for your contribution. This pull request contains changes to files other than Contributors.md and requires manual review.`;
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: pull_number,
              body: message
            });