#!/usr/bin/env ruby

require 'dmenu'

JAVA_DOC_LOCATION = "/home/crater2150/manuals/scala-*"

USER_DOC_LOCATION = (ENV['XDG_DATA_HOME'] || ENV['HOME'] + '/.local') + '/scaladoc/*'

class DocIndex
  attr_reader :items

  def initialize(path)
    @items = []
    find_entries(path)
  end

  private

  def gen_candidates(dir)
    Dir.entries(dir).reject {|e| e == '.' ||
                             e == '..' ||
                             e == 'class-use' ||
                             e == 'src-html' ||
                             (e =~ /^[a-z].*\..*/ && e != 'package-summary.html')}
  end

  def find_entries(dir, path = [])
    candidates = gen_candidates(dir)
    candidates.each do |entry|
      if entry == "package-summary.html"
        @items << Dmenu::Item.new(path.join(?.),  dir + ?/ + entry)
      elsif entry.end_with? ".html"
        @items << Dmenu::Item.new(
          path.join(?.) + ?. + File.basename(entry, '.html'),
          dir + ?/ + entry
        )
      elsif File.directory?(dir + ?/ + entry)
        find_entries(dir + ?/ + entry, path + [entry])
      end
    end
  end
end


scala_folder = Dir.glob(JAVA_DOC_LOCATION).last + "/api/scala-library/"

menu = Dmenu.new
menu.items = DocIndex.new(scala_folder).items
menu.case_insensitive = true
menu.prompt = "Javadoc:"
menu.lines = 20
system("xdg-open #{menu.run.value}")