From: Logan Capaldo <logancapaldo@...>
Date: 2006-09-18T02:42:57+09:00
Subject: Re: readline() with editing and history?

On Mon, Sep 18, 2006 at 02:31:30AM +0900, Josef Wolf wrote:
> On Mon, Sep 18, 2006 at 01:50:36AM +0900, Logan Capaldo wrote:
> > On Sun, Sep 17, 2006 at 08:01:17PM +0900, Josef Wolf wrote:
> > > I have not tried his example because I assumed the library could not be
> > > loaded.  I was confused by the fact that "require 'readline'" returns
> > > "false".  Isn't require supposed to return "true" if successful?
> > The return value of require is borderline meaningless. If require
> > returns false, that just means that the file has already been require'd.
> 
> Are you sure with this?  I get false even on the _first_ require.
Are you sure it's the first require? ;) For instance, I load readline in
my irbrc so I get the fancy line editing. 
Try: RUBYOPT="" ruby -e 'p require("readline")'

Or alternatively before doing require 'readline', do
$LOADED_FEATURES.grep(/readline/)
> 
> > If it can't require the file for whatever reason it will raise and
> > exception, not return false.
> 
> Maybe this should be mentioned in the documentation?  Currently, it says:
> 
>      Ruby tries to load the library named _string_, returning +true+ if
>      successful.  [ ... ]
> 
Well yeah if it's already require'd it didn't sucessful load it (since
its already been loaded ;) ).