execute

# File lib/rubygems/commands/which_command.rb, line 38
  def execute
    found = true

    options[:args].each do |arg|
      arg = arg.sub(/#{Regexp.union(*Gem.suffixes)}$/, '')
      dirs = $LOAD_PATH

      spec = Gem::Specification.find_by_path arg

      if spec then
        if options[:search_gems_first] then
          dirs = spec.full_require_paths + $LOAD_PATH
        else
          dirs = $LOAD_PATH + spec.full_require_paths
        end
      end

      # TODO: this is totally redundant and stupid
      paths = find_paths arg, dirs

      if paths.empty? then
        alert_error "Can't find Ruby library file or shared library #{arg}"

        found &&= false
      else
        say paths
      end
    end

    terminate_interaction 1 unless found
  end