teddit/views/includes/head.pug

if(user_preferences.theme === 'dark')
  link(rel="stylesheet", type="text/css", href="/css/dark.css")
if(user_preferences.theme === 'sepia')
  link(rel="stylesheet", type="text/css", href="/css/sepia.css")
link(rel="stylesheet", type="text/css", href="/css/styles.css")
link(rel="icon", type="image/png", sizes="32x32", href="/favicon.png")
meta(name="viewport", content="width=device-width, initial-scale=1.0")
-
  function kFormatter(num) {
      return Math.abs(num) > 999 ? Math.sign(num)*((Math.abs(num)/1000).toFixed(1)) + 'k' : Math.sign(num)*Math.abs(num)
  }
  
  function timeDifference(time) {
    time = parseInt(time) * 1000
    let ms_per_minute = 60 * 1000
    let ms_per_hour = ms_per_minute * 60
    let ms_per_day = ms_per_hour * 24
    let ms_per_month = ms_per_day * 30
    let ms_per_year = ms_per_day * 365
    let current = + new Date()

    let elapsed = Math.abs(time - current)
    let r = ''
    let e

    if (elapsed < ms_per_minute) {
      e = Math.round(elapsed/1000)
      r = `${e} seconds ago`
      if(e === 1)
        r = 'just now'
      return r
    }

    else if (elapsed < ms_per_hour) {
      e = Math.round(elapsed/ms_per_minute)
      r = `${e} minutes ago`
      if(r === 1)
        r = 'a minute ago'
      return r
    }

    else if (elapsed < ms_per_day ) {
      e = Math.round(elapsed/ms_per_hour)
      r = `${e} hours ago`
      if(e === 1)
        r = 'an hour ago'
      return r
    }

    else if (elapsed < ms_per_month) {
      e = Math.round(elapsed/ms_per_day)
      r = `${e} days ago`
      if(e === 1)
        r = '1 day ago'
      return r
    }

    else if (elapsed < ms_per_year) {
      e = Math.round(elapsed/ms_per_month)
      r = `${e} months ago`
      if(e === 1)
        r = '1 month ago'
      return r
    }

    else {
      e = Math.round(elapsed/ms_per_year)
      r = `${e} years ago`
      if(e === 1)
        r = '1 year ago'
      return r
    }
  }
  
  function toDateString(time) {
    let d = new Date();
    d.setTime(time*1000);
    return d.toDateString();
  }
  
  function toUTCString(time) {
    let d = new Date();
    d.setTime(time*1000);
    return d.toUTCString();
  }
  
  function secondsToMMSS(time) {
    return new Date(time * 1000).toISOString().substr(14,5)
  }
  
  function getFileExtension(url) {
    try {
      url = new URL(url)
      let pathname = url.pathname
      let file_ext = pathname.substring(pathname.lastIndexOf('.') + 1)
      if(file_ext) {
        return file_ext
      } else {
        return ''
      }
    } catch (error) {
      console.error(`Invalid url supplied to getFileExtension(). URL: ${url}`, error)
      return ''
    }
  }
  
  function cleanTitle(s) {
    if(s) {
      var re = /&(?:amp|#38|lt|#60|gt|#62|apos|#39|quot|#34);/g;
      var unescaped = {
        '&amp;': '&',
        '&#38;': '&',
        '&lt;': '<',
        '&#60;': '<',
        '&gt;': '>',
        '&#62;': '>',
        '&apos;': "'",
        '&#39;': "'",
        '&quot;': '"',
        '&#34;': '"'
      }
      return s.replace(re, (m) => {
        return unescaped[m]
      })
    } else {
      return ''
    }
  }