Node.js Script to Convert Notion Markdown Metadata into Hugo

formatter.js

const fs = require('fs');
const path = require('path');

const folderPath = 'path_to_folder'; // Replace with the path to your folder containing markdown files

fs.readdir(folderPath, (err, files) => {
  if (err) {
    console.error('Error reading directory:', err);
    return;
  }

  files.forEach((filename) => {
    if (filename.endsWith('.md')) {
      const filePath = path.join(folderPath, filename);

      fs.readFile(filePath, 'utf8', (err, content) => {
        if (err) {
          console.error(`Error reading file ${filename}:`, err);
          return;
        }

        // Check if desired content already exists
        const placeholderPattern = /---\ndate = '{{THE DATE}}'\ntags = \[\{'THE SUB TAGS', 'ANY OTHER SUBTAGS IF MORE THAN ONE'\}\]\ntitle = '{{THE TITLE}}'\n---/;
        if (placeholderPattern.test(content)) {
          console.log(`${filename} already has the desired content. Skipping...`);
          return;
        }

        // Remove unwanted lines
        // const updatedContent = content.replace(/#(.+?)\n\nDate: .+\nFeatured: .+\nSub Tags: .+\nTags: .+\n/, '');
       

        // Extracting relevant information using regular expressions
        const title = content.match(/#(.+?)\n/) ? content.match(/#(.+?)\n/)[1].trim() : ''
        const dateString = content.match(/Date: (.+?)\n/) ? content.match(/Date: (.+?)\n/)[1].trim(): ''
        const dateObj = new Date(dateString);
        const year = dateObj.getFullYear();
        const month = String(dateObj.getMonth() + 1).padStart(2, '0');
        const day = String(dateObj.getDate()).padStart(2, '0');
        const date = `${year}-${month}-${day}`;
        const tags = content.match(/Sub Tags: (.+?)\n/) ? content.match(/Sub Tags: (.+?)\n/)[1].trim().split(',') : [];


        // Replace link references
        const modifiedContent = content.replace(/\[(.+?)\]\s*\((.+?)\)/g, (match, title, link) => {
            const modifiedLink = `{{< ref "${link.replace(/\s/g, '%20')}" >}}`;
            return `[${title}](${modifiedLink})`;
          });


       const updatedContent =  modifiedContent.replace(/# (.*?)\n\nTags: (.*?)\nDate: (.*?)\nSub Tags: (.*?)\n/, '');

        // Creating the new content with the desired format
        const newContent = `---\ndate: '${date}'\ntags: [${tags.map((tag) => `'${tag.trim()}'`).join(', ')}]\ntitle: '${title}'\n---\n\n${updatedContent}`;



        // Writing the updated content back to the file
        fs.writeFile(filePath, newContent, 'utf8', (err) => {
          if (err) {
            console.error(`Error writing to file ${filename}:`, err);
            return;
          }
          console.log(`Updated ${filename}`);
        });
      });
    }
  });
});

console.log('Markdown files update process started.');