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/remote_fetcher'
require 'rubygems/spec_fetcher'
require 'rubygems/local_remote_options'

class Gem::Commands::SourcesCommand < Gem::Command

  include Gem::LocalRemoteOptions

  def initialize
    require 'fileutils'

    super 'sources',
          'Manage the sources and cache file RubyGems uses to search for gems'

    add_option '-a', '--add SOURCE_URI', 'Add source' do |value, options|
      options[:add] = value
    end

    add_option '-l', '--list', 'List sources' do |value, options|
      options[:list] = value
    end

    add_option '-r', '--remove SOURCE_URI', 'Remove source' do |value, options|
      options[:remove] = value
    end

    add_option '-c', '--clear-all',
               'Remove all sources (clear the cache)' do |value, options|
      options[:clear_all] = value
    end

    add_option '-u', '--update', 'Update source cache' do |value, options|
      options[:update] = value
    end

    add_proxy_option
  end

  def defaults_str
    '--list'
  end

  def execute
    options[:list] = !(options[:add] ||
                       options[:clear_all] ||
                       options[:remove] ||
                       options[:update])

    if options[:clear_all] then
      path = File.join Gem.user_home, '.gem', 'specs'
      FileUtils.rm_rf path

      unless File.exist? path then
        say "*** Removed specs cache ***"
      else
        unless File.writable? path then
          say "*** Unable to remove source cache (write protected) ***"
        else
          say "*** Unable to remove source cache ***"
        end

        terminate_interaction 1
      end
    end

    if source_uri = options[:add] then
      uri = URI source_uri

      if uri.scheme and uri.scheme.downcase == 'http' and
         uri.host.downcase == 'rubygems.org' then
        question = <<-QUESTION.chomp
https://rubygems.org is recommended for security over #{uri}

Do you want to add this insecure source?
        QUESTION

        terminate_interaction 1 unless ask_yes_no question
      end

      source = Gem::Source.new source_uri

      begin
        if Gem.sources.include? source_uri then
          say "source #{source_uri} already present in the cache"
        else
          source.load_specs :released
          Gem.sources << source
          Gem.configuration.write

          say "#{source_uri} added to sources"
        end
      rescue URI::Error, ArgumentError
        say "#{source_uri} is not a URI"
        terminate_interaction 1
      rescue Gem::RemoteFetcher::FetchError => e
        say "Error fetching #{source_uri}:\n\t#{e.message}"
        terminate_interaction 1
      end
    end

    if options[:remove] then
      source_uri = options[:remove]

      unless Gem.sources.include? source_uri then
        say "source #{source_uri} not present in cache"
      else
        Gem.sources.delete source_uri
        Gem.configuration.write

        say "#{source_uri} removed from sources"
      end
    end

    if options[:update] then
      Gem.sources.each_source do |src|
        src.load_specs :released
        src.load_specs :latest
      end

      say "source cache successfully updated"
    end

    if options[:list] then
      say "*** CURRENT SOURCES ***"
      say

      Gem.sources.each do |src|
        say src
      end
    end
  end

  private

  def remove_cache_file(desc, path)
    FileUtils.rm_rf path

    if not File.exist?(path) then
      say "*** Removed #{desc} source cache ***"
    elsif not File.writable?(path) then
      say "*** Unable to remove #{desc} source cache (write protected) ***"
    else
      say "*** Unable to remove #{desc} source cache ***"
    end
  end

end