* lib/irb/init.rb (IRB.rc_files): yield possible rc file names.

* lib/irb/input-method.rb (IRB::ReadlineInputMethod::initialize):
  load and save history automatically.  [ruby-core:02352]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5638 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/irb/input-method.rb

@@ -85,12 +85,49 @@ module IRB
     require "readline"
     class ReadlineInputMethod < InputMethod
       include Readline 
+
+      def ReadlineInputMethod.create_finalizer(hist, file)
+	proc do
+	  if num = IRB.conf[:SAVE_HISTORY] and (num = num.to_i) > 0
+            if hf = IRB.conf[:HISTORY_FILE]
+	      file = File.expand_path(hf)
+            end
+            if file
+              open(file, 'w' ) do |f|
+                hist = hist.to_a
+                f.puts(hist[-num..-1] || hist)
+              end
+	    end
+	  end
+	end
+      end
+
       def initialize
 	super
 
 	@line_no = 0
 	@line = []
 	@eof = false
+
+	loader = proc {|f| f.each {|l| HISTORY << l.chomp}}
+	if hist = IRB.conf[:HISTORY_FILE]
+	  hist = File.expand_path(hist)
+	  begin
+	    open(hist, &loader) 
+	  rescue
+	  end
+	else
+	  IRB.rc_files("_history") do |hist|
+	    begin
+	      open(hist, &loader)
+	    rescue
+	      hist = nil
+	    else
+	      break
+	    end
+	  end
+	end
+	ObjectSpace.define_finalizer(self, ReadlineInputMethod.create_finalizer(HISTORY, hist))
       end
 
       def gets