From: Thomas Uehlinger <uehli@...>
Date: 2004-02-07T03:15:37+09:00
Subject: [PATCH] Persistent IRB history

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Hi all

I found persistent Readline history (i.e. saved to a hidden file in the users home directory) a pretty useful feature in other applicatons.
So here is a patch for IRB so the history gets automatically saved to ~/.irb_history and will be loaded next time IRB is used.

Comments?

-- Thomas Uehlinger

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--- input-method_old.rb	2004-02-06 19:06:58.920287816 +0100
+++ input-method.rb	2004-02-06 19:04:50.228851888 +0100
@@ -85,12 +85,33 @@
     require "readline"
     class ReadlineInputMethod < InputMethod
       include Readline 
+      
+      def ReadlineInputMethod.create_finalizer(hist)
+        proc {|id|
+            open(File.join(ENV["HOME"], '.irb_history'), 'w' ) {|f|
+                i = 0
+                while (l = hist.pop and i < 50)
+                    f.puts(l)
+                    i += 1
+                end
+            }
+        }
+      end
+      
       def initialize
 	super
 
 	@line_no = 0
 	@line = []
 	@eof = false
+        
+        begin
+            lines = File.readlines(File.join(ENV["HOME"], '.irb_history'))
+            lines.reverse.each {|l| HISTORY.push << l.chomp }
+            HISTORY.pop
+        rescue
+        end
+        ObjectSpace.define_finalizer(self, ReadlineInputMethod.create_finalizer(HISTORY))
       end
 
       def gets

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