Gitako/scripts/generate-file-icon-index.js

const languageIds = require('./language-id-ext.json')

function generateCSV() {
  const records = []

  document.body
    .querySelector('table')
    .querySelectorAll('tbody tr')
    .forEach(tr => {
      const [name, id, dark, light] = Array.from(tr.querySelectorAll('td'))
      const exts = []
      const names = []
      id.innerHTML
        .replace(/<sub>|<\/sub>/g, '')
        .split(', ')
        .map(part => {
          const tags = part.match(/<(\w+)>(.*?)<\/\1>/g)
          if (tags) {
            tags.forEach(subPart => {
              const match = subPart.match(/<(\w+)>(.*?)<\/\1>/)
              if (match) {
                const [, tag, content] = match
                if (tag === 'strong') {
                  // filenames in bold
                  names.push(content)
                } else if (tag === 'code') {
                  // language ids in code block
                  const map = Object.values(languageIds).find(({ ids }) =>
                    (Array.isArray(ids) ? ids : [ids]).includes(content),
                  )
                  if (map && map.exts) exts.push(map.exts)
                } else {
                  console.warn(`Found unrecognized format`, subPart, tag) // unknown
                }
              }
            })
          } else if (part) {
            // extensions are in regular fonts
            exts.push(part.replace(/^\./, ''))
          }
        })
      records.push({
        name: name.innerText,
        exts,
        names,
        icon: getSrc(dark.querySelector('img')) || getSrc(light.querySelector('img')),
      })
    })

  function getSrc(img) {
    return img && img.src
  }

  const prepend = 'https://github.com/vscode-icons/vscode-icons/raw/master/icons/file_type_'
  const append = '.svg?sanitize=true'
  const separator = ':'
  const csv = records
    .map(({ name, names, exts, icon }) =>
      [
        name,
        names.join(separator),
        exts.join(separator),
        // icon.replace(prepend, '').replace(append, ''), // assumption: name is equal to this
      ].join(','),
    )
    .join('\n')

  return csv
}

console.log(generateCSV())