peterbe__compare-tags.js

import got from 'got'
import cheerio from 'cheerio'

async function getTags(url) {
  const response = await got(url)
  return countTags(response.body)
}

function countTags(body) {
  const tags = {}
  const $ = cheerio.load(body)
  $('#article-contents *').each((i, el) => {
    tags[el.tagName] = (tags[el.tagName] || 0) + 1
  })
  return tags
}

async function main(args) {
  const tags = await getTags(args[0])
  if (args.length === 1) {
    const { pathname } = new URL(args[0])
    args.push('https://docs.github.com' + pathname)
  }
  const tags2 = await getTags(args[1])

  // console.log(tags)
  // console.log(tags2)
  let differences = 0
  for (const [tag, count] of Object.entries(tags)) {
    if (count !== tags2[tag]) {
      console.log(`<${tag}>: ${count} ≠ ${tags2[tag]}`)
      differences++
    }
  }
  if (differences === 0) {
    console.log("THEY'RE IDENTICAL!")
  } else {
    console.log('Differences:', differences)
  }
}

main(process.argv.slice(2))