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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# frozen_string_literal: true
require 'rubygems/command'
require 'rubygems/version_option'
require 'rubygems/rdoc'
require 'fileutils'

class Gem::Commands::RdocCommand < Gem::Command
  include Gem::VersionOption

  def initialize
    super 'rdoc', 'Generates RDoc for pre-installed gems',
          :version => Gem::Requirement.default,
          :include_rdoc => false, :include_ri => true, :overwrite => false

    add_option('--all',
               'Generate RDoc/RI documentation for all',
               'installed gems') do |value, options|
      options[:all] = value
    end

    add_option('--[no-]rdoc',
               'Generate RDoc HTML') do |value, options|
      options[:include_rdoc] = value
    end

    add_option('--[no-]ri',
               'Generate RI data') do |value, options|
      options[:include_ri] = value
    end

    add_option('--[no-]overwrite',
               'Overwrite installed documents') do |value, options|
      options[:overwrite] = value
    end

    add_version_option
  end

  def arguments # :nodoc:
    "GEMNAME       gem to generate documentation for (unless --all)"
  end

  def defaults_str # :nodoc:
    "--version '#{Gem::Requirement.default}' --ri --no-overwrite"
  end

  def description # :nodoc:
    <<-DESC
The rdoc command builds documentation for installed gems.  By default
only documentation is built using rdoc, but additional types of
documentation may be built through rubygems plugins and the
Gem.post_installs hook.

Use --overwrite to force rebuilding of documentation.
    DESC
  end

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

  def execute
    specs = if options[:all] then
              Gem::Specification.to_a
            else
              get_all_gem_names.map do |name|
                Gem::Specification.find_by_name name, options[:version]
              end.flatten.uniq
            end

    if specs.empty? then
      alert_error 'No matching gems found'
      terminate_interaction 1
    end

    specs.each do |spec|
      doc = Gem::RDoc.new spec, options[:include_rdoc], options[:include_ri]

      doc.force = options[:overwrite]

      if options[:overwrite] then
        FileUtils.rm_rf File.join(spec.doc_dir, 'ri')
        FileUtils.rm_rf File.join(spec.doc_dir, 'rdoc')
      end

      begin
        doc.generate
      rescue Errno::ENOENT => e
        e.message =~ / - /
        alert_error "Unable to document #{spec.full_name}, #{$'} is missing, skipping"
        terminate_interaction 1 if specs.length == 1
      end
    end
  end

end