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'
require 'rubygems/version_option'

class Gem::Commands::ContentsCommand < Gem::Command

  include Gem::VersionOption

  def initialize
    super 'contents', 'Display the contents of the installed gems',
          :specdirs => [], :lib_only => false, :prefix => true

    add_version_option

    add_option(      '--all',
               "Contents for all gems") do |all, options|
      options[:all] = all
    end

    add_option('-s', '--spec-dir a,b,c', Array,
               "Search for gems under specific paths") do |spec_dirs, options|
      options[:specdirs] = spec_dirs
    end

    add_option('-l', '--[no-]lib-only',
               "Only return files in the Gem's lib_dirs") do |lib_only, options|
      options[:lib_only] = lib_only
    end

    add_option(      '--[no-]prefix',
               "Don't include installed path prefix") do |prefix, options|
      options[:prefix] = prefix
    end
  end

  def arguments # :nodoc:
    "GEMNAME       name of gem to list contents for"
  end

  def defaults_str # :nodoc:
    "--no-lib-only --prefix"
  end

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

  def execute
    version = options[:version] || Gem::Requirement.default

    spec_dirs = options[:specdirs].map do |i|
      [i, File.join(i, "specifications")]
    end.flatten

    path_kind = if spec_dirs.empty? then
                  spec_dirs = Gem::Specification.dirs
                  "default gem paths"
                else
                  "specified path"
                end

    gem_names = if options[:all] then
                  Gem::Specification.map(&:name)
                else
                  get_all_gem_names
                end

    gem_names.each do |name|
      # HACK: find_by_name fails for some reason... ARGH
      # How many places must we embed our resolve logic?
      spec = Gem::Specification.find_all_by_name(name, version).last

      unless spec then
        say "Unable to find gem '#{name}' in #{path_kind}"

        if Gem.configuration.verbose then
          say "\nDirectories searched:"
          spec_dirs.each { |dir| say dir }
        end

        terminate_interaction 1 if gem_names.length == 1
      end

      gem_path = spec.full_gem_path
      extra    = "/{#{spec.require_paths.join ','}}" if options[:lib_only]
      glob     = "#{gem_path}#{extra}/**/*"
      files    = Dir[glob]

      gem_path = File.join gem_path, '' # add trailing / if missing

      files.sort.each do |file|
        next if File.directory? file

        file = file.sub gem_path, '' unless options[:prefix]

        say file
      end
    end
  end

end