auto-respond-pr.yml

name: Auto Respond to PR

on:
  pull_request:
    types:
      - opened
      - synchronize
    paths:
      - '**.json'
      - '**.js'
      - '**.yml'

jobs:
  auto_respond:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout base branch
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.base.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          path: base

      - name: Checkout PR branch
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          path: pr
          fetch-depth: 0

      - name: Install dependencies
        run: |
          npm install diff

      - name: Run build script on base branch
        run: |
          cd base
          npm install
          node index.js
          cd ..

      - name: Run build script on PR branch
        run: |
          cd pr
          git config --global user.email "dax@duck.com"
          git config --global user.name "dax"
          git rebase origin/${{ github.event.pull_request.base.ref }}
          npm install
          node index.js
          cd ..

      - name: Create diff of file outputs
        run: node pr/.github/scripts/diff-directories.js base/generated pr/generated > diff_output.txt

      - name: Find Previous Comment
        uses: peter-evans/find-comment@v3
        id: find_comment
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: 'github-actions[bot]'
          body-includes: 'Generated file outputs'
          direction: last

      - name: Create Comment Body
        uses: actions/github-script@v7
        id: create_body
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const fs = require('fs');
            const prNumber = context.issue.number;
            const diffOutput = fs.readFileSync('diff_output.txt', 'utf8');
            let commentBody = `
            ### Generated file outputs:
            *Time updated:* ${new Date().toUTCString()}
            ${diffOutput}
            `
            if (commentBody.length > 65536) {
                commentBody = '❌ Generated diff output is too large to post as a comment, run locally to see the diff and validate'
            }
            core.setOutput('comment_body', commentBody);

      - name: Create, or Update the Comment
        uses: peter-evans/create-or-update-comment@v4
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-id: ${{ steps.find_comment.outputs.comment-id }}
          body: ${{ steps.create_body.outputs.comment_body }}
          edit-mode: replace