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diff --git a/jni/ruby/lib/rubygems/command_manager.rb b/jni/ruby/lib/rubygems/command_manager.rb
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+#--
+# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
+# All rights reserved.
+# See LICENSE.txt for permissions.
+#++
+
+require 'rubygems/command'
+require 'rubygems/user_interaction'
+
+##
+# The command manager registers and installs all the individual sub-commands
+# supported by the gem command.
+#
+# Extra commands can be provided by writing a rubygems_plugin.rb
+# file in an installed gem.  You should register your command against the
+# Gem::CommandManager instance, like this:
+#
+#   # file rubygems_plugin.rb
+#   require 'rubygems/command_manager'
+#
+#   Gem::CommandManager.instance.register_command :edit
+#
+# You should put the implementation of your command in rubygems/commands.
+#
+#   # file rubygems/commands/edit_command.rb
+#   class Gem::Commands::EditCommand < Gem::Command
+#     # ...
+#   end
+#
+# See Gem::Command for instructions on writing gem commands.
+
+class Gem::CommandManager
+
+  include Gem::UserInteraction
+
+  BUILTIN_COMMANDS = [ # :nodoc:
+    :build,
+    :cert,
+    :check,
+    :cleanup,
+    :contents,
+    :dependency,
+    :environment,
+    :fetch,
+    :generate_index,
+    :help,
+    :install,
+    :list,
+    :lock,
+    :mirror,
+    :open,
+    :outdated,
+    :owner,
+    :pristine,
+    :push,
+    :query,
+    :rdoc,
+    :search,
+    :server,
+    :sources,
+    :specification,
+    :stale,
+    :uninstall,
+    :unpack,
+    :update,
+    :which,
+    :yank,
+  ]
+
+  ##
+  # Return the authoritative instance of the command manager.
+
+  def self.instance
+    @command_manager ||= new
+  end
+
+  ##
+  # Returns self. Allows a CommandManager instance to stand
+  # in for the class itself.
+
+  def instance
+    self
+  end
+
+  ##
+  # Reset the authoritative instance of the command manager.
+
+  def self.reset
+    @command_manager = nil
+  end
+
+  ##
+  # Register all the subcommands supported by the gem command.
+
+  def initialize
+    require 'timeout'
+    @commands = {}
+
+    BUILTIN_COMMANDS.each do |name|
+      register_command name
+    end
+  end
+
+  ##
+  # Register the Symbol +command+ as a gem command.
+
+  def register_command(command, obj=false)
+    @commands[command] = obj
+  end
+
+  ##
+  # Unregister the Symbol +command+ as a gem command.
+
+  def unregister_command(command)
+    @commands.delete command
+  end
+
+  ##
+  # Returns a Command instance for +command_name+
+
+  def [](command_name)
+    command_name = command_name.intern
+    return nil if @commands[command_name].nil?
+    @commands[command_name] ||= load_and_instantiate(command_name)
+  end
+
+  ##
+  # Return a sorted list of all command names as strings.
+
+  def command_names
+    @commands.keys.collect {|key| key.to_s}.sort
+  end
+
+  ##
+  # Run the command specified by +args+.
+
+  def run(args, build_args=nil)
+    process_args(args, build_args)
+  rescue StandardError, Timeout::Error => ex
+    alert_error "While executing gem ... (#{ex.class})\n    #{ex}"
+    ui.backtrace ex
+
+    terminate_interaction(1)
+  rescue Interrupt
+    alert_error "Interrupted"
+    terminate_interaction(1)
+  end
+
+  def process_args(args, build_args=nil)
+    if args.empty? then
+      say Gem::Command::HELP
+      terminate_interaction 1
+    end
+
+    case args.first
+    when '-h', '--help' then
+      say Gem::Command::HELP
+      terminate_interaction 0
+    when '-v', '--version' then
+      say Gem::VERSION
+      terminate_interaction 0
+    when /^-/ then
+      alert_error "Invalid option: #{args.first}.  See 'gem --help'."
+      terminate_interaction 1
+    else
+      cmd_name = args.shift.downcase
+      cmd = find_command cmd_name
+      cmd.invoke_with_build_args args, build_args
+    end
+  end
+
+  def find_command(cmd_name)
+    possibilities = find_command_possibilities cmd_name
+
+    if possibilities.size > 1 then
+      raise Gem::CommandLineError,
+            "Ambiguous command #{cmd_name} matches [#{possibilities.join(', ')}]"
+    elsif possibilities.empty? then
+      raise Gem::CommandLineError, "Unknown command #{cmd_name}"
+    end
+
+    self[possibilities.first]
+  end
+
+  def find_command_possibilities(cmd_name)
+    len = cmd_name.length
+
+    found = command_names.select { |name| cmd_name == name[0, len] }
+
+    exact = found.find { |name| name == cmd_name }
+
+    exact ? [exact] : found
+  end
+
+  private
+
+  def load_and_instantiate(command_name)
+    command_name = command_name.to_s
+    const_name = command_name.capitalize.gsub(/_(.)/) { $1.upcase } << "Command"
+    load_error = nil
+
+    begin
+      begin
+        require "rubygems/commands/#{command_name}_command"
+      rescue LoadError => e
+        load_error = e
+      end
+      Gem::Commands.const_get(const_name).new
+    rescue Exception => e
+      e = load_error if load_error
+
+      alert_error "Loading command: #{command_name} (#{e.class})\n\t#{e}"
+      ui.backtrace e
+    end
+  end
+
+end
+