img-link-checker.yml

name: Check Image Links

on:
  pull_request:
    paths:
      - 'topics/**/*.qmd'
      - 'pathway/**/*.qmd'
      - '*.qmd'


jobs:
  check-image-links:
    runs-on: ubuntu-latest

    steps:
    - name: Check out repository
      uses: actions/checkout@v3

    - name: Set up Node.js
      uses: actions/setup-node@v3
      with:
        node-version: '20'

    - name: Install dependencies
      run: npm install axios glob

    - name: Check image links
      run: |
        node -e "
        const fs = require('fs');
        const path = require('path');
        const axios = require('axios');
        const glob = require('glob');

        const markdownFiles = glob.sync('**/*.qmd');
        const imageLinks = [];

        markdownFiles.forEach(file => {
            const content = fs.readFileSync(file, 'utf8');
            const regex = /!\[.*?\]\((.*?)\)/g;
            let match;
            while ((match = regex.exec(content)) !== null) {
              const url = match[1];
              if (url.startsWith('http://') || url.startsWith('https://')) {
                  imageLinks.push({ file, url });
              }
            }
        });

        const checkLinks = async () => {
            const results = await Promise.all(imageLinks.map(async ({ file, url }) => {
            try {
                const response = await axios.head(url);
                return response.status === 200 ? null : { file, url, status: response.status };
            } catch (error) {
                return { file, url, status: error.response ? error.response.status : 'Unknown error' };
            }
            }));

            const brokenLinks = results.filter(result => result !== null);
            if (brokenLinks.length > 0) {
            console.log('Broken image links found:');
            brokenLinks.forEach(({ file, url, status }) => {
                console.log(`File: ${file}, URL: ${url}, Status: ${status}`);
            });
            process.exit(1);
            } else {
            console.log('No broken image links found.');
            }
        };

        checkLinks();
        "