Show documents when completion

lib/irb/completion.rb

@@ -8,6 +8,7 @@
 #
 
 require "readline"
+require "rdoc"
 
 module IRB
   module InputCompletor # :nodoc:
@@ -197,6 +198,14 @@ module IRB
       end
     }
 
+    RDocRIDriver = RDoc::RI::Driver.new
+    PerfectMatchedProc = proc { |matched|
+      begin
+        RDocRIDriver.display_name(matched)
+      rescue RDoc::RI::Driver::NotFoundError
+      end
+    }
+
     # Set of available operators in Ruby
     Operators = %w[% & * ** + - / < << <= <=> == === =~ > >= >> [] []= ^ ! != !~]
 

lib/irb/input-method.rb

@@ -222,6 +222,7 @@ module IRB
       end
       Reline.completion_append_character = nil
       Reline.completion_proc = IRB::InputCompletor::CompletionProc
+      Reline.dig_perfect_match_proc = IRB::InputCompletor::PerfectMatchedProc
     end
 
     def check_termination(&block)

lib/rdoc/ri/paths.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-require 'rdoc/ri'
+require 'rdoc/rdoc'
 
 ##
 # The directories where ri data lives.  Paths can be enumerated via ::each, or

lib/rubygems.rb

@@ -18,6 +18,7 @@ require 'rubygems/compatibility'
 require 'rubygems/defaults'
 require 'rubygems/deprecate'
 require 'rubygems/errors'
+require 'rubygems/path_support'
 
 ##
 # RubyGems is the Ruby standard for publishing and managing third party