validate_pr.yml

name: Validate PR Template

on:
  pull_request:
    types: [opened, edited, synchronize]

jobs:
  validate:
    # This ensures the script ONLY runs if "[submission]" is in the title
    if: contains(github.event.pull_request.title, '[submission]')
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '16'

      - name: Install dependencies
        run: npm install js-yaml

      - name: Validate YAML
        uses: actions/github-script@v6
        with:
          script: |
            const yaml = require('js-yaml');
            const prBody = context.payload.pull_request.body || '';
            
            // 1. Extraction
            const normalizedBody = prBody.replace(/\r\n/g, '\n');
            const startMarker = '```yaml\n';
            const endMarker = '\n```';
            
            const startIndex = normalizedBody.indexOf(startMarker);
            const contentStart = startIndex + startMarker.length;
            const endIndex = normalizedBody.indexOf(endMarker, contentStart);
            
            if (startIndex === -1 || endIndex === -1) {
              core.setFailed('No YAML block found. Please use the [submission] template.');
              return;
            }
            
            // 2. Parsing & Field Check
            let data;
            try {
              const yamlContent = normalizedBody.slice(contentStart, endIndex);
              const cleanYaml = yamlContent.split('\n').map(l => l.split('#')[0].trim()).join('\n');
              data = yaml.load(cleanYaml);
            } catch (e) {
              core.setFailed(`YAML Syntax Error: ${e.message}`);
              return;
            }
            
            const requiredFields = ['submission_name', 'submission_folder', 'authors', 'ruleset'];
            const emptyFields = requiredFields.filter(f => !data?.[f] || data[f].toString().trim() === '');
            
            if (emptyFields.length > 0) {
              const errorMsg = `⚠️ Missing required fields: ${emptyFields.join(', ')}`;
              
              // Post a comment so the user knows exactly what to fix
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.pull_request.number,
                body: errorMsg
              });
              
              core.setFailed(errorMsg);
            }