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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sh-3ll 1.0
DIR:/opt/alt/ruby32/share/rubygems/rubygems/commands/
Upload File :
Current File : //opt/alt/ruby32/share/rubygems/rubygems/commands/which_command.rb
# frozen_string_literal: true

require_relative "../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 description # :nodoc:
    <<-EOF
The which command is like the shell which command and shows you where
the file you wish to require lives.

You can use the which command to help determine why you are requiring a
version you did not expect or to look at the content of a file you are
requiring to see why it does not behave as you expect.
    EOF
  end

  def execute
    found = true

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

      spec = Gem::Specification.find_by_path arg

      if spec
        if options[:search_gems_first]
          dirs = spec.full_require_paths + $LOAD_PATH
        else
          dirs = $LOAD_PATH + spec.full_require_paths
        end
      end

      paths = find_paths arg, dirs

      if paths.empty?
        alert_error "Can't find Ruby library file or shared library #{arg}"
        found = false
      else
        say paths
      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) && !File.directory?(full_path)
          result << full_path
          return result unless options[:show_all]
        end
      end
    end

    result
  end

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