1 files changed, 47 insertions, 0 deletions
diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
new file mode 100644
index 0000000000..cbd4012773
--- /dev/null
+++ b/lib/irb/completion.rb
@@ -0,0 +1,47 @@
+
+require "readline"
+
+module IRB
+  module InputCompletion
+    ReservedWords = [
+      "BEGIN", "END",
+      "alias", "and", 
+      "begin", "break", 
+      "case", "class",
+      "def", "defined", "do",
+      "else", "elsif", "end", "ensure",
+      "false", "for", 
+      "if", "in", 
+      "module", 
+      "next", "nil", "not",
+      "or", 
+      "redo", "rescue", "retry", "return",
+      "self", "super",
+      "then", "true",
+      "undef", "unless", "until",
+      "when", "while",
+      "yield"
+    ]
+      
+    CompletionProc = proc { |input|
+      case input
+      when /^([^.]+)\.([^.]*)$/
+	receiver = $1
+	message = $2
+	if eval("(local_variables|#{receiver}.type.constants).include?('#{receiver}')", 
+	    IRB.conf[:MAIN_CONTEXT].bind)
+	  candidates = eval("#{receiver}.methods", IRB.conf[:MAIN_CONTEXT].bind)
+	else
+	  candidates = []
+	end
+	candidates.grep(/^#{Regexp.quote(message)}/).collect{|e| receiver + "." + e}
+      else
+	candidates = eval("methods | private_methods | local_variables | type.constants", 
+			  IRB.conf[:MAIN_CONTEXT].bind)
+	(candidates|ReservedWords).grep(/^#{Regexp.quote(input)}/)
+      end
+    }
+  end
+end
+
+Readline.completion_proc = IRB::InputCompletion::CompletionProc