A small wrapper around prettier to format (without breaking) the custom Slidev markdown

slidev-prettier.js

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

const START_TAG = '\n<!-- prettier-ignore-start -->\n';
const END_TAG = '\n<!-- prettier-ignore-end -->\n';

function addPrettierIgnoreTags(content) {
  const pattern = /---(?:\n.+)*\n---/g;

  return content.replace(pattern, (match) => {
    return `${START_TAG}\n${match}\n${END_TAG}`;
  });
}

function removePrettierIgnoreTags(content) {
  return content.replace(new RegExp(START_TAG, 'g'), '').replace(new RegExp(END_TAG, 'g'), '');
}

function main() {
  if (process.argv.length !== 3) {
    console.log('Usage: node slidev-prettier.js <slides.md path>');
    process.exit(1);
  }

  const filePath = process.argv[2];

  fs.readFile(filePath, 'utf8', (err, content) => {
    if (err) {
      console.error(`Error reading file: ${err}`);
      process.exit(1);
    }

    content = addPrettierIgnoreTags(content);

    const formattedContent = prettier.format(content, { parser: 'markdown' });

    const finalContent = removePrettierIgnoreTags(formattedContent);

    fs.writeFile(filePath, finalContent, 'utf8', (err) => {
      if (err) {
        console.error(`Error writing file: ${err}`);
        process.exit(1);
      }
    });
  });
}

main();