From: nobu.nokada@...
Date: 2005-01-15T14:40:29+09:00
Subject: Re: Irb and Ruby Separation

Hi,

At Sat, 15 Jan 2005 06:15:33 +0900,
Nicholas Van Weerdenburg wrote in [ruby-talk:126498]:
> I guess my question might be better phrased "why doesn't running the
> ruby interpreter with no input not default to interactive mode (irb)
> such as with the python interpreter".
> 
> I'm mostly curious for no practical reason. Just wondering if there is
> functionality or design benefits.

It's in the ToDo list.

  * Built-in Interactive Ruby.


Index: ruby.c
===================================================================
RCS file: /cvs/ruby/src/ruby/ruby.c,v
retrieving revision 1.94
diff -U2 -p -r1.94 ruby.c
--- ruby.c	24 Sep 2004 05:53:41 -0000	1.94
+++ ruby.c	15 Jan 2005 05:34:34 -0000
@@ -782,5 +782,15 @@ proc_options(argc, argv)
     }
     else if (strlen(script) == 1 && script[0] == '-') {
-	load_stdin();
+	if (!do_check && !do_loop && isatty(0) && isatty(1) && isatty(2) &&
+	    !NIL_P(rb_rescue2(rb_require, (VALUE)"irb",
+			      (VALUE (*)())0, (VALUE)0,
+			      rb_eLoadError, (VALUE)0))) {
+	    require_libraries();
+	    ruby_eval_tree = NEW_CALL(NEW_LIT(rb_const_get(rb_cObject, rb_intern("IRB"))),
+				      rb_intern("start"), 0);
+	}
+	else {
+	    load_stdin();
+	}
     }
     else {


-- 
Nobu Nakada