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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DIR:/opt/alt/ruby26/lib64/ruby/2.6.0/rubygems/commands/
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Current File : //opt/alt/ruby26/lib64/ruby/2.6.0/rubygems/commands/build_command.rb
# frozen_string_literal: true
require 'rubygems/command'
require 'rubygems/package'

class Gem::Commands::BuildCommand < Gem::Command

  def initialize
    super 'build', 'Build a gem from a gemspec'

    add_option '--force', 'skip validation of the spec' do |value, options|
      options[:force] = true
    end

    add_option '--strict', 'consider warnings as errors when validating the spec' do |value, options|
      options[:strict] = true
    end

    add_option '-o', '--output FILE', 'output gem with the given filename' do |value, options|
      options[:output] = value
    end
  end

  def arguments # :nodoc:
    "GEMSPEC_FILE  gemspec file name to build a gem for"
  end

  def description # :nodoc:
    <<-EOF
The build command allows you to create a gem from a ruby gemspec.

The best way to build a gem is to use a Rakefile and the Gem::PackageTask
which ships with RubyGems.

The gemspec can either be created by hand or extracted from an existing gem
with gem spec:

  $ gem unpack my_gem-1.0.gem
  Unpacked gem: '.../my_gem-1.0'
  $ gem spec my_gem-1.0.gem --ruby > my_gem-1.0/my_gem-1.0.gemspec
  $ cd my_gem-1.0
  [edit gem contents]
  $ gem build my_gem-1.0.gemspec

Gems can be saved to a specified filename with the output option:

  $ gem build my_gem-1.0.gemspec --output=release.gem

    EOF
  end

  def usage # :nodoc:
    "#{program_name} GEMSPEC_FILE"
  end

  def execute
    gemspec = get_one_gem_name

    unless File.exist? gemspec
      gemspec += '.gemspec' if File.exist? gemspec + '.gemspec'
    end

    if File.exist? gemspec
      Dir.chdir(File.dirname(gemspec)) do
        spec = Gem::Specification.load File.basename(gemspec)

        if spec
          Gem::Package.build(
            spec,
            options[:force],
            options[:strict],
            options[:output]
          )
        else
          alert_error "Error loading gemspec. Aborting."
          terminate_interaction 1
        end
      end
    else
      alert_error "Gemspec file not found: #{gemspec}"
      terminate_interaction 1
    end
  end

end