treeify.js

const html = require('html-escaper')
const codes = require('./node_modules/iso-lang-codes/src/index.js')

exports.renderTree = function (object, title = 'Root') {
  return `<b>${title.toString()}</b>\n${renderLines(object).join('\n')}`
}

function renderLines (object, depth = 0, prefix = [], parentKey = '') {
  var keys = Object.keys(object)
  var lines = []
  const isArr = Array.isArray(object)
  for (var i = 0; i < keys.length;) {
    var key = keys[i]
    var isLast = (++i === keys.length)

    if (typeof object[key] !== 'object') {
      // render key
      var text = renderPrefix(prefix, isLast) + (isArr ? '' : `<b>${key}:</b> `)

      // render value
      const valString = escapeHtml(object[key].toString())

      if (key === 'username') {
        text += '<a href="https://t.me/' + object[key] + '">' +
          valString + '</a>'
      } else if (key === 'file_size' && typeof object[key] !== 'string') {
        text += formatSizeUnits(object[key])
      } else if (key === 'set_name' && typeof object[key] === 'string') {
        text += '<a href="https://t.me/addstickers/' +
          object[key] + '">' + valString + '</a>'
      } else if (key === 'duration') {
        text += formatTime(object[key])
      } else if (key === 'language_code') {
        const langString = codes.locales[valString] || '-'
        text += `<code>${valString}</code> (${langString})`
      } else if (key === 'message_id' || key === 'created') {
        text += object[key]
      } else if (typeof object[key] === 'number' || key.indexOf('id') !== -1) {
        text += '<code>' + valString + '</code>'
      } else {
        text += valString
      }

      lines.push(text)
    } else {
      // go to deeper level
      lines.push(renderPrefix(prefix, isLast) + '<b>' + key + '</b>')
      lines = lines.concat(renderLines(
        object[key], depth + 1, prefix.concat([(isLast ? ' ' : '┊')]), key
      ))
    }
  }
  return lines
}

function renderPrefix (prefix, isLast) {
  return ' ' + prefix.concat([(isLast ? '└' : '├')]).join('  ') + ' '
}

function formatSizeUnits (bytes) {
  if (bytes >= 1073741824) {
    return (bytes / 1073741824).toFixed(2) + ' GB'
  } else if (bytes >= 1048576) {
    return (bytes / 1048576).toFixed(2) + ' MB'
  } else if (bytes >= 1024) {
    return (bytes / 1024).toFixed(2) + ' kB'
  } else if (bytes > 1) {
    return bytes + ' bytes'
  } else if (bytes === 1) {
    return bytes + ' byte'
  } else {
    return '0 bytes'
  }
}
exports.formatSizeUnits = formatSizeUnits

function formatTime (seconds) {
  let res = {}
  var started = false;

  [ // time units to calculate
    ['d', 86400],
    ['h', 3600],
    ['m', 60],
    ['s', 1]
  ].forEach(unit => {
    // don't include leading 0 values
    if (!started) {
      if (seconds > unit[1]) started = true
      else return
    }

    // extract maximal amount of full units
    res[unit[0]] = Math.floor(seconds / unit[1])
    seconds %= unit[1]
  })

  // if empty, enter at least seconds
  if (!started) res = { s: 0 }

  return Object.values(res).join(':') + ' (' + Object.keys(res).join(':') + ')'
}
exports.formatTime = formatTime

function escapeHtml (unsafe) {
  if (unsafe === undefined) {
    return unsafe
  } else if (typeof unsafe === 'object') {
    for (var key in unsafe) {
      unsafe[key] = escapeHtml(unsafe[key])
    }
    return unsafe
  } else if (typeof unsafe === 'string') {
    return html.escape(unsafe)
  } else { return unsafe }
}
exports.escapeHtml = escapeHtml

/* DEBUG AREA */