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/ruby27/share/rubygems/rubygems/source/
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Current File : //opt/alt/ruby27/share/rubygems/rubygems/source/local.rb
# frozen_string_literal: true
##
# The local source finds gems in the current directory for fulfilling
# dependencies.

class Gem::Source::Local < Gem::Source

  def initialize # :nodoc:
    @specs   = nil
    @api_uri = nil
    @uri     = nil
    @load_specs_names = {}
  end

  ##
  # Local sorts before Gem::Source and after Gem::Source::Installed

  def <=>(other)
    case other
    when Gem::Source::Installed,
         Gem::Source::Lock then
      -1
    when Gem::Source::Local then
      0
    when Gem::Source then
      1
    else
      nil
    end
  end

  def inspect # :nodoc:
    keys = @specs ? @specs.keys.sort : 'NOT LOADED'
    "#<%s specs: %p>" % [self.class, keys]
  end

  def load_specs(type) # :nodoc:
    @load_specs_names[type] ||= begin
      names = []

      @specs = {}

      Dir["*.gem"].each do |file|
        begin
          pkg = Gem::Package.new(file)
        rescue SystemCallError, Gem::Package::FormatError
          # ignore
        else
          tup = pkg.spec.name_tuple
          @specs[tup] = [File.expand_path(file), pkg]

          case type
          when :released
            unless pkg.spec.version.prerelease?
              names << pkg.spec.name_tuple
            end
          when :prerelease
            if pkg.spec.version.prerelease?
              names << pkg.spec.name_tuple
            end
          when :latest
            tup = pkg.spec.name_tuple

            cur = names.find { |x| x.name == tup.name }
            if !cur
              names << tup
            elsif cur.version < tup.version
              names.delete cur
              names << tup
            end
          else
            names << pkg.spec.name_tuple
          end
        end
      end

      names
    end
  end

  def find_gem(gem_name, version = Gem::Requirement.default, # :nodoc:
               prerelease = false)
    load_specs :complete

    found = []

    @specs.each do |n, data|
      if n.name == gem_name
        s = data[1].spec

        if version.satisfied_by?(s.version)
          if prerelease
            found << s
          elsif !s.version.prerelease? || version.prerelease?
            found << s
          end
        end
      end
    end

    found.max_by { |s| s.version }
  end

  def fetch_spec(name) # :nodoc:
    load_specs :complete

    if data = @specs[name]
      data.last.spec
    else
      raise Gem::Exception, "Unable to find spec for #{name.inspect}"
    end
  end

  def download(spec, cache_dir = nil) # :nodoc:
    load_specs :complete

    @specs.each do |name, data|
      return data[0] if data[1].spec == spec
    end

    raise Gem::Exception, "Unable to find file for '#{spec.full_name}'"
  end

  def pretty_print(q) # :nodoc:
    q.group 2, '[Local gems:', ']' do
      q.breakable
      q.seplist @specs.keys do |v|
        q.text v.full_name
      end
    end
  end

end