Get =
  threadExcerpt: (thread) ->
    {OP} = thread
    excerpt = OP.info.subject?.trim() or
      OP.info.comment.replace(/\n+/g, ' // ') or
      Conf['Anonymize'] and 'Anonymous' or
      $('.nameBlock', OP.nodes.info).textContent.trim()
    if excerpt.length > 70
      excerpt = "#{excerpt[...67]}..." 
    "/#{thread.board}/ - #{excerpt}"
  threadFromRoot: (root) ->
    g.threads["#{g.BOARD}.#{root.id[1..]}"]
  threadFromNode: (node) ->
    Get.threadFromRoot $.x 'ancestor::div[@class="thread"]', node
  postFromRoot: (root) ->
    link    = $ 'a[title="Highlight this post"]', root
    boardID = link.pathname.split('/')[1]
    postID  = link.hash[2..]
    index   = root.dataset.clone
    post    = g.posts["#{boardID}.#{postID}"]
    if index then post.clones[index] else post
  postFromNode: (root) ->
    Get.postFromRoot $.x '(ancestor::div[contains(@class,"postContainer")][1]|following::div[contains(@class,"postContainer")][1])', root
  contextFromNode: (node) ->
    Get.postFromRoot $.x 'ancestor::div[parent::div[@class="thread"]][1]', node
  postDataFromLink: (link) ->
    if link.hostname is 'boards.4chan.org'
      path     = link.pathname.split '/'
      boardID  = path[1]
      threadID = path[3]
      postID   = link.hash[2..]
    else # resurrected quote
      {boardID, threadID, postID} = link.dataset
      threadID or= 0
    return {
      boardID:  boardID
      threadID: +threadID
      postID:   +postID
    }
  allQuotelinksLinkingTo: (post) ->
    # Get quotelinks & backlinks linking to the given post.
    quotelinks = []
    # First:
    #   In every posts,
    #   if it did quote this post,
    #   get all their backlinks.
    for ID, quoterPost of g.posts
      if quoterPost.quotes.contains post.fullID
        for quoterPost in [quoterPost].concat quoterPost.clones
          quotelinks.push.apply quotelinks, quoterPost.nodes.quotelinks
    # Second:
    #   If we have quote backlinks:
    #   in all posts this post quoted
    #   and their clones,
    #   get all of their backlinks.
    if Conf['Quote Backlinks']
      for quote in post.quotes
        continue unless quotedPost = g.posts[quote]
        for quotedPost in [quotedPost].concat quotedPost.clones
          quotelinks.push.apply quotelinks, [quotedPost.nodes.backlinks...]
    # Third:
    #   Filter out irrelevant quotelinks.
    quotelinks.filter (quotelink) ->
      {boardID, postID} = Get.postDataFromLink quotelink
      boardID is post.board.ID and postID is post.ID
  postClone: (boardID, threadID, postID, root, context) ->
    if post = g.posts["#{boardID}.#{postID}"]
      Get.insert post, root, context
      return

    root.textContent = "Loading post No.#{postID}..."
    if threadID
      $.cache "//api.4chan.org/#{boardID}/res/#{threadID}.json", ->
        Get.fetchedPost @, boardID, threadID, postID, root, context
    else if url = Redirect.to 'post', {boardID, postID}
      $.cache url,
        -> Get.archivedPost @, boardID, postID, root, context
      ,
        withCredentials: url.archive.withCredentials
  insert: (post, root, context) ->
    # Stop here if the container has been removed while loading.
    return unless root.parentNode
    clone = post.addClone context
    Main.callbackNodes Clone, [clone]

    # Get rid of the side arrows.
    {nodes} = clone
    $.rmAll nodes.root
    $.add nodes.root, nodes.post

    $.rmAll root
    $.add root, nodes.root
  fetchedPost: (req, boardID, threadID, postID, root, context) ->
    # In case of multiple callbacks for the same request,
    # don't parse the same original post more than once.
    if post = g.posts["#{boardID}.#{postID}"]
      Get.insert post, root, context
      return

    {status} = req
    unless [200, 304].contains status
      # The thread can die by the time we check a quote.
      if url = Redirect.to 'post', {boardID, postID}
        $.cache url,
          -> Get.archivedPost @, boardID, postID, root, context
        ,
          withCredentials: url.archive.withCredentials
      else
        $.addClass root, 'warning'
        root.textContent =
          if status is 404
            "Thread No.#{threadID} 404'd."
          else
            "Error #{req.statusText} (#{req.status})."
      return

    posts = JSON.parse(req.response).posts
    Build.spoilerRange[boardID] = posts[0].custom_spoiler
    for post in posts
      break if post.no is postID # we found it!
      if post.no > postID
        # The post can be deleted by the time we check a quote.
        if url = Redirect.to 'post', {boardID, postID}
          $.cache url,
            -> Get.archivedPost @, boardID, postID, root, context
          ,
            withCredentials: url.archive.withCredentials
        else
          $.addClass root, 'warning'
          root.textContent = "Post No.#{postID} was not found."
        return

    board = g.boards[boardID] or
      new Board boardID
    thread = g.threads["#{boardID}.#{threadID}"] or
      new Thread threadID, board
    post = new Post Build.postFromObject(post, boardID), thread, board
    Main.callbackNodes Post, [post]
    Get.insert post, root, context
  archivedPost: (req, boardID, postID, root, context) ->
    # In case of multiple callbacks for the same request,
    # don't parse the same original post more than once.
    if post = g.posts["#{boardID}.#{postID}"]
      Get.insert post, root, context
      return

    data = JSON.parse req.response
    if data.error
      $.addClass root, 'warning'
      root.textContent = data.error
      return

    # convert comment to html
    bq = $.el 'blockquote', textContent: data.comment # set this first to convert text to HTML entities
    # https://github.com/eksopl/fuuka/blob/master/Board/Yotsuba.pm#L413-452
    # https://github.com/eksopl/asagi/blob/master/src/main/java/net/easymodo/asagi/Yotsuba.java#L109-138
    bq.innerHTML = bq.innerHTML.replace ///
      \n
      | \[/?b\]
      | \[/?spoiler\]
      | \[/?code\]
      | \[/?moot\]
      | \[/?banned\]
    ///g, Get.parseMarkup

    comment = bq.innerHTML
      # greentext
      .replace(/(^|>)(&gt;[^<$]*)(<|$)/g, '$1<span class=quote>$2</span>$3')
      # quotes
      .replace /((&gt;){2}(&gt;\/[a-z\d]+\/)?\d+)/g, '<span class=deadlink>$1</span>'

    threadID = +data.thread_num
    o =
      # id
      postID:   "#{postID}"
      threadID: "#{threadID}"
      boardID:  boardID
      # info
      name:     data.name_processed
      capcode:  switch data.capcode
        when 'M' then 'mod'
        when 'A' then 'admin'
        when 'D' then 'developer'
      tripcode: data.trip
      uniqueID: data.poster_hash
      email:    if data.email then encodeURI data.email else ''
      subject:  data.title_processed
      flagCode: data.poster_country
      flagName: data.poster_country_name_processed
      date:     data.fourchan_date
      dateUTC:  data.timestamp
      comment:  comment
      # file
    if data.media?.media_filename
      o.file =
        name:      data.media.media_filename_processed
        timestamp: data.media.media_orig
        url:       data.media.media_link or data.media.remote_media_link
        height:    data.media.media_h
        width:     data.media.media_w
        MD5:       data.media.media_hash
        size:      data.media.media_size
        turl:      data.media.thumb_link or "//thumbs.4chan.org/#{boardID}/thumb/#{data.media.preview_orig}"
        theight:   data.media.preview_h
        twidth:    data.media.preview_w
        isSpoiler: data.media.spoiler is '1'

    board = g.boards[boardID] or
      new Board boardID
    thread = g.threads["#{boardID}.#{threadID}"] or
      new Thread threadID, board
    post = new Post Build.post(o, true), thread, board,
      isArchived: true
    Main.callbackNodes Post, [post]
    Get.insert post, root, context
  parseMarkup: (text) ->
    switch text
      when '\n'
        '<br>'
      when '[b]'
        '<b>'
      when '[/b]'
        '</b>'
      when '[spoiler]'
        '<s>'
      when '[/spoiler]'
        '</s>'
      when '[code]'
        '<pre class=prettyprint>'
      when '[/code]'
        '</pre>'
      when '[moot]'
        '<div style="padding:5px;margin-left:.5em;border-color:#faa;border:2px dashed rgba(255,0,0,.1);border-radius:2px">'
      when '[/moot]'
        '</div>'
      when '[banned]'
        '<b style="color: red;">'
      when '[/banned]'
        '</b>'