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/validator'
require 'rubygems/doctor'

class Gem::Commands::CheckCommand < Gem::Command

  include Gem::VersionOption

  def initialize
    super 'check', 'Check a gem repository for added or missing files',
          :alien => true, :doctor => false, :dry_run => false, :gems => true

    add_option('-a', '--[no-]alien',
               'Report "unmanaged" or rogue files in the',
               'gem repository') do |value, options|
      options[:alien] = value
    end

    add_option('--[no-]doctor',
               'Clean up uninstalled gems and broken',
               'specifications') do |value, options|
      options[:doctor] = value
    end

    add_option('--[no-]dry-run',
               'Do not remove files, only report what',
               'would be removed') do |value, options|
      options[:dry_run] = value
    end

    add_option('--[no-]gems',
               'Check installed gems for problems') do |value, options|
      options[:gems] = value
    end

    add_version_option 'check'
  end

  def check_gems
    say 'Checking gems...'
    say
    gems = get_all_gem_names rescue []

    Gem::Validator.new.alien(gems).sort.each do |key, val|
      unless val.empty?
        say "#{key} has #{val.size} problems"
        val.each do |error_entry|
          say "  #{error_entry.path}:"
          say "    #{error_entry.problem}"
        end
      else
        say "#{key} is error-free" if Gem.configuration.verbose
      end
      say
    end
  end

  def doctor
    say 'Checking for files from uninstalled gems...'
    say

    Gem.path.each do |gem_repo|
      doctor = Gem::Doctor.new gem_repo, options[:dry_run]
      doctor.doctor
    end
  end

  def execute
    check_gems if options[:gems]
    doctor if options[:doctor]
  end

  def arguments # :nodoc:
    'GEMNAME       name of gem to check'
  end

  def defaults_str # :nodoc:
    '--gems --alien'
  end

  def description # :nodoc:
    <<-EOF
The check command can list and repair problems with installed gems and
specifications and will clean up gems that have been partially uninstalled.
    EOF
  end

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

end