* lib/irb/cmd/help.rb (IRB::ExtendCommand::Help#execute): use RI

interactive mode if no argument.  [ruby-dev:39839]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27254 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Apr  8 07:16:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/irb/cmd/help.rb (IRB::ExtendCommand::Help#execute): use RI
+	  interactive mode if no argument.  [ruby-dev:39839]
+
 Wed Apr  8 02:33:55 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
 
 	* array.c (rb_ary_permutation): Remove limitation for lengthy permutations

lib/irb/cmd/help.rb

@@ -9,7 +9,6 @@
 #
 
 require 'rdoc/ri/driver'
-require 'rdoc/ri/util'
 
 require "irb/cmd/nop.rb"
 
@@ -21,6 +20,10 @@ module IRB
       rescue SystemExit
       else
         def execute(*names)
+          if names.empty?
+            Ri.interactive
+            return
+          end
           names.each do |name|
             begin
               Ri.get_info_for(name.to_s)