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//opt/alt/ruby22/lib64/ruby/2.2.0/rubygems/commands/open_command.rb

require 'English'
require 'rubygems/command'
require 'rubygems/version_option'
require 'rubygems/util'

class Gem::Commands::OpenCommand < Gem::Command

include Gem::VersionOption

def initialize
    super 'open', 'Open gem sources in editor'

add_option('-e', '--editor EDITOR', String,
               "Opens gem sources in EDITOR") do |editor, options|
      options[:editor] = editor || get_env_editor
    end
  end

def arguments # :nodoc:
    "GEMNAME     name of gem to open in editor"
  end

def defaults_str # :nodoc:
    "-e #{get_env_editor}"
  end

def description # :nodoc:
    <<-EOF
        The open command opens gem in editor and changes current path
        to gem's source directory. Editor can be specified with -e option,
        otherwise rubygems will look for editor in $EDITOR, $VISUAL and
        $GEM_EDITOR variables.
    EOF
  end

def usage # :nodoc:
    "#{program_name} GEMNAME [-e EDITOR]"
  end

def get_env_editor
    ENV['GEM_EDITOR'] ||
      ENV['VISUAL'] ||
      ENV['EDITOR'] ||
      'vi'
  end

def execute
    @version = options[:version] || Gem::Requirement.default
    @editor  = options[:editor] || get_env_editor

found = open_gem(get_one_gem_name)

terminate_interaction 1 unless found
  end

def open_gem name
    spec = spec_for name
    return false unless spec

open_editor(spec.full_gem_path)
  end

def open_editor path
    system(*@editor.split(/\s+/) + [path])
  end

def spec_for name
    spec = Gem::Specification.find_all_by_name(name, @version).last

return spec if spec

say "Unable to find gem '#{name}'"
  end
end