Message2297

Below is the patch I recently posted to jython-dev allowing the 
use of the TAB key when working in an interactive jython 
interpreter with ReadlineConsole.  Since python makes active 
use of indentation in defining the language, this resolves a 
serious usability problem when using jython with readline 
support. 
 
This patch works with the current CVS version of java-readline 
(to be released as version 0.8.1), though will not have any 
negative effects with earlier java-readline versions. 
 
Ben. 
 
 
diff -ru old/jython-2.1.0/org/python/util/ReadlineConsole.java 
jython-2.1.0/org/python/util/ReadlineConsole.java 
--- old/jython-2.1.0/org/python/util/ReadlineConsole.java	
2003-08-27 13:49:20.000000000 +1000 
+++ jython-2.1.0/org/python/util/ReadlineConsole.java	
2003-08-27 15:45:11.000000000 +1000 
@@ -26,6 +26,24 @@ 
             // Will use a pure java fallback. 
         } 
         Readline.initReadline("jpython"); 
+ 
+        // Disable readline completion if we have a new enough 
Readline 
+        // class, so that <TAB> characters can be input directly. 
+        try { 
+            java.lang.reflect.Field inhibitConstField = 
+                
Readline.class.getField("RL_INHIBIT_COMPLETION"); 
+            if (inhibitConstField != null) { 
+                Object inhibitConst = inhibitConstField.get(null); 
+                Class[] setVarArgTypes = { inhibitConst.getClass(), 
+                    Integer.TYPE }; 
+                java.lang.reflect.Method setVar = 
Readline.class.getMethod( 
+                    "setVar", setVarArgTypes); 
+                if (setVar != null) { 
+                    Object[] args = { inhibitConst, new Integer(1) }; 
+                    setVar.invoke(null, args); 
+                } 
+            } 
+        } catch (Exception exc) {} 
     }