Hacktacular script that quashes markdown headers to their highest size, with header-2 being the largest

normalize-markdown-headers.js

const fs = require('fs');

// Check if a Markdown file is provided as a command-line argument
const filePath = process.argv[2];

if (!filePath) {
  console.error('Please provide a Markdown file as a command-line argument.');
  process.exit(1);
}

// Read the content of the Markdown file
let markdownContent = fs.readFileSync(filePath, 'utf8');
markdownContent = markdownContent.replace(/\r/g, "");

// Regular expression to match Markdown headings and capture their level and text
const headingRegex = /^(#+)\s+(.*)$/gm;

const headings = [];
let match;

while ((match = headingRegex.exec(markdownContent)) !== null) {
  const level = match[1].length;
  const text = match[2];
  headings.push({ level, text });
}


let prevLevel = 1;
let first = true;

for (let [idx, obj] of headings.entries()) {
    if(idx === 0) {
        obj.newLevel = 1
    } else {
        obj.newLevel = 2;
    }

    const mdHeading = (numHash) => new Array(numHash).fill('#').join('')
    // const reg = new RegExp(
    //     `^\\s*${mdHeading(obj.level)}\\s+${obj.text.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')}\\s*$`, 'gm')
        const reg = `${mdHeading(obj.level)} ${obj.text}`

        markdownContent = markdownContent.replace(reg, `${mdHeading(obj.newLevel)} ${obj.text}`);
}


fs.writeFileSync(filePath, markdownContent)