#-- vim:sw=2:et
#++
#
# :title: Slashdot plugin for rbot

require 'rexml/document'

class SlashdotPlugin < Plugin
  include REXML
  def help(plugin, topic="")
    "slashdot search <string> [<max>=4] => search slashdot for <string>, slashdot [<max>=4] => return up to <max> slashdot headlines (use negative max to return that many headlines, but all on one line.)"
  end

  # This method defines a filter for /. pages. It's needed because the generic
  # summarization grabs a comment, not the actual article.
  #
  # This filter relies on Hpricot being available, since REXML isn't too
  # happy with the /. pages
  def slashdot_filter(s)
    return nil unless defined? Hpricot
    loc = Utils.check_location(s, /slashdot\.org/)
    return nil unless loc
    h = Hpricot(s[:text])
    # If we have no title tag in a head tag, return as this is not
    # a /. page (it's probably a Slashdot RSS
    ht = h/"head/title"
    return nil if ht.empty?
    title = ht.first.to_html.ircify_html
    arts = (h/"div.article")
    return nil if arts.empty?
    if arts.length > 1
      tits = []
      arts.each { |el|
        # see if the div tag with generaltitle class is present
        artitle = (el/"div.generaltitle").first
        if artitle
          tits << artitle.to_html.ircify_html
          next
        end
        # otherwise, check for skin+datitle a tags
        datitle = (el/"a.datitle").first
        next unless datitle
        skin = (el/"a.skin").first
        artitle = [
          skin ? skin.innerHTML.ircify_html : nil,
          datitle.innerHTML.ircify_html
        ].compact.join(" ")
        tits << artitle
      }
      content = tits.join(" | ")
    else
      det = (arts.first/"div.details").first.to_html.ircify_html
      body = (arts.first/"div.body").first.to_html.ircify_html
      content = [det, body].join(' ')
    end
    return {:title => title, :content => content}
  end

  def initialize
    super
    if defined? Hpricot
      @bot.register_filter(:slashdot, :htmlinfo) { |s| slashdot_filter(s) }
    end
  end

  def search_slashdot(m, params)
    max = params[:limit].to_i
    search = params[:search].to_s

    xml = @bot.httputil.get("http://slashdot.org/search.pl?content_type=rss&query=#{CGI.escape(search)}")
    unless xml
      m.reply "search for #{search} failed"
      return
    end
    debug xml.inspect
    begin
      doc = Document.new xml
    rescue REXML::ParseException => err
      warning err.inspect
      m.reply "couldn't parse output XML: #{err.class}"
      return
    end
    unless doc
      m.reply "search for #{search} failed"
      return
    end
    debug doc.inspect
    max = 8 if max > 8
    done = 0
    doc.elements.each("*/item") {|e|
      desc = e.elements["title"].text
      desc.gsub!(/(.{150}).*/, '\1..')
      reply = sprintf("%s | %s", e.elements["link"].text, desc.ircify_html)
      m.reply reply
      done += 1
      break if done >= max
    }
    unless done > 0
      m.reply "search for #{search} failed"
    end
  end

  def slashdot(m, params)
    debug params.inspect
    max = params[:limit].to_i
    debug "max is #{max}"
    xml = @bot.httputil.get('http://slashdot.org/slashdot.xml')
    unless xml
      m.reply "slashdot news parse failed"
      return
    end
    doc = Document.new xml
    unless doc
      m.reply "slashdot news parse failed (invalid xml)"
      return
    end
    done = 0
    oneline = false
    if max < 0
      max = (0 - max)
      oneline = true
    end
    max = 8 if max > 8
    matches = Array.new
    doc.elements.each("*/story") {|e|
      matches << [ e.elements["title"].text,
                   e.elements["author"].text,
                   e.elements["time"].text.gsub(/\d{4}-(\d{2})-(\d{2})/, "\\2/\\1").gsub(/:\d\d$/, "") ]
      done += 1
      break if done >= max
    }
    if oneline
      m.reply matches.collect{|mat| mat[0]}.join(" | ")
    else
      matches.each {|mat|
        m.reply sprintf("%36s | %8s | %8s", mat[0][0,36], mat[1][0,8], mat[2])
      }
    end
  end
end
plugin = SlashdotPlugin.new
plugin.map 'slashdot search :limit *search', :action => 'search_slashdot',
           :defaults => {:limit => 4}, :requirements => {:limit => /^-?\d+$/}
plugin.map 'slashdot :limit', :defaults => {:limit => 4},
                              :requirements => {:limit => /^-?\d+$/}
