晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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require 'rubygems/command'

class Gem::Commands::WhichCommand < Gem::Command
  def initialize
    super 'which', 'Find the location of a library file you can require',
          :search_gems_first => false, :show_all => false

    add_option '-a', '--[no-]all', 'show all matching files' do |show_all, options|
      options[:show_all] = show_all
    end

    add_option '-g', '--[no-]gems-first',
               'search gems before non-gems' do |gems_first, options|
      options[:search_gems_first] = gems_first
    end
  end

  def arguments # :nodoc:
    "FILE          name of file to find"
  end

  def defaults_str # :nodoc:
    "--no-gems-first --no-all"
  end

  def execute
    found = false

    options[:args].each do |arg|
      arg = arg.sub(/#{Regexp.union(*Gem.suffixes)}$/, '')
      dirs = $LOAD_PATH

      spec = Gem::Specification.find_by_path arg

      if spec then
        if options[:search_gems_first] then
          dirs = gem_paths(spec) + $LOAD_PATH
        else
          dirs = $LOAD_PATH + gem_paths(spec)
        end
      end

      # TODO: this is totally redundant and stupid
      paths = find_paths arg, dirs

      if paths.empty? then
        alert_error "Can't find ruby library file or shared library #{arg}"
      else
        say paths
        found = true
      end
    end

    terminate_interaction 1 unless found
  end

  def find_paths(package_name, dirs)
    result = []

    dirs.each do |dir|
      Gem.suffixes.each do |ext|
        full_path = File.join dir, "#{package_name}#{ext}"
        if File.exist? full_path and not File.directory? full_path then
          result << full_path
          return result unless options[:show_all]
        end
      end
    end

    result
  end

  def gem_paths(spec)
    spec.require_paths.collect { |d| File.join spec.full_gem_path, d }
  end

  def usage # :nodoc:
    "#{program_name} FILE [FILE ...]"
  end

end