cheatsheets/assets/2017/script.js

/*
 * Behavior: Search
 */

$(function () {
  $('[data-js-searchable-item]').each(function () {
    const $this = $(this)
    const data = $this.data('js-searchable-item')
    const words = permutate(data)

    $this.attr('data-search-index', words.join(' '))
  })

  // Propagate item search indices to headers
  $('[data-js-searchable-header]').each(function () {
    const $this = $(this)
    const $els = $this
      .nextUntil('[data-js-searchable-header]')
      .filter('[data-search-index]')

    const keywords = $els
      .map(function () { return $(this).attr('data-search-index') })
      .get()
      .join(' ')
      .split(' ')

    $this.attr('data-search-index', keywords.join(' '))
  })
})

/*
 * Behavior: search input
 */

$(function () {
  $('[data-js-search-input]').each(function () {
    const $this = $(this)
    const val = $this.val()

    $this.on('input', () => {
      const val = $this.val()

      if (val === '') {
        Search.showAll()
      } else {
        Search.show(val)
      }
    })

    const query = (qs(window.location.search) || {}).q
    if (query && query.length) {
      $this.val(query)
      Search.show(query)
    }
  })

  $('[data-js-search-form]').each(function () {
    const $this = $(this)

    $this.on('submit', e => {
      e.preventDefault()
      const href = $('a[data-search-index]:visible').eq(0).attr('href')
      if (href) window.location = href
    })
  })
})

/*
 * Behavior: Disqus
 */

$(function () {
  $('[data-js-disqus]').each(function () {
    const $this = $(this)
    const data = $this.data('js-disqus')

    window.disqus_config = function () {
      this.page.url = data.url
      this.page.identifier = data.identifier
    }

    injectDisqus(data.host)
  })
})

/*
 * Behavior: dismiss button
 */

$(function () {
  $('[data-js-dismiss]').each(function () {
    var $button = $(this)
    var $parent = $button.closest('[data-js-dismissable]')
    var id = $parent.data('js-dismissable').id || ''

    $button.on('click', function (e) {
      Dismiss.setDismissed(id)
      e.preventDefault()
      $parent.remove()
    })
  })

  $('[data-js-dismissable]').each(function () {
    var $this = $(this)
    var id = $this.data('js-dismissable').id || ''
    const isDismissed = Dismiss.isDismissed(id)
    if (isDismissed || window.location.search.indexOf('preview') !== -1) {
      $this.remove()
    } else {
      $this.removeClass('-hide')
    }
  })
})

/*
 * Helper: dismissed
 */

const Dismiss = {
  setDismissed: function (id) {
    Store.update('dismissed', function (data) {
      data[id] = true
      return data
    })
  },

  isDismissed: function (id) {
    const data = Store.fetch('dismissed')
    return data && data[id]
  }
}

/*
 * Simple LocalStorage shim
 */

const Store = {
  update: function (key, fn) {
    if (!window.localStorage) return
    let data = JSON.parse(window.localStorage[key] || '{}')
    data = fn(data)
    window.localStorage[key] = JSON.stringify(data)
  },

  fetch: function (key) {
    if (!window.localStorage) return
    return JSON.parse(window.localStorage[key] || '{}')
  }
}

/*
 * Helper: injects disqus
 */

function injectDisqus (host) {
  var d = document, s = d.createElement('script')
  s.src = 'https://' + host + '/embed.js'
  s.setAttribute('data-timestamp', +new Date())
  ;(d.head || d.body).appendChild(s)
}

/*
 * Helper for splitting to words
 */

function splitwords (str) {
  const words = str.toLowerCase()
    .split(/[ \/\-_]/)
    .filter(k => k && k.length !== 0)

  return words
}

/*
 * Search
 */

const Search = {
  showAll () {
    $('[data-search-index]').removeAttr('aria-hidden')
  },

  show (val) {
    const keywords = splitwords(val)

    if (!keywords.length) return Search.showAll()

    const selectors = keywords
      .map(k => `[data-search-index~=${JSON.stringify(k)}]`)
      .join('')

    $('[data-search-index]').attr('aria-hidden', true)
    $(selectors).removeAttr('aria-hidden')
  }
}

/*
 * Permutator
 */

function permutate (data) {
  let words = []
  if (data.slug) {
    words = words.concat(permutateString(data.slug))
  }
  if (data.category) {
    words = words.concat(permutateString(data.category))
  }
  return words
}

function permutateString (str) {
  let words = []
  let inputs = splitwords(str)

  inputs.forEach(word => {
    words = words.concat(permutateWord(word))
  })

  return words
}

function permutateWord (str) {
  let words = []
  const len = str.length
  for (var i = 1; i <= len; ++i) {
    words.push(str.substr(0, i))
  }
  return words
}

/*
 * Helper: minimal qs implementation
 */

function qs (search) {
  search = search.substr(1)
  const parts = search.split('&').map(p => p.split('='))
  return parts.reduce((result, part) => {
    result[part[0]] = qsdecode(part[1])
    return result
  }, {})
}

function qsdecode (string) {
  if (!string) string = ''
  string = string.replace(/\+/g, ' ')
  return string
}