From: Graham Nicholls <graham@...>
Date: 2005-04-29T17:24:28+09:00
Subject: Re: irb command-line editing

Dick Davies wrote:

> * Graham Nicholls <graham@rockcons.co.uk> [0459 15:59]:
>> Graham Nicholls wrote:
>> 
>> > gabriele renzi wrote:
>> > 
>> >> Graham Nicholls ha scritto:
>> >>> Hi.  Can anyone tell me how to get vi-style command-line editing in
>> >>> irb, please.
>> >>> Thanks
>> >> 
>> >> I guess you can set up your own inputrc file, since IRB is based on
>> >> readline, and set "editing-mode" to "vi", I never trtied it, though.
>> > I have a .inputrc with precisely that. ESC-k simply echoes.
>> > 
>> > I've tried rebuilding from source with:
>> > 
>> > ./configure --with-readline=YES ; make ; make install
>> > 
>> > ,but to no avail.
>> > 
>> > Is this the right redline option? DO I start irb with a parameter?
>> > 
>> > Thanks
>> PS Sorry to followup on y own post, but when I strace the irb binary, all
>> the references to readline produce an ENOENT error.  Readline is on the
>> box, as I use it from bash (unless its built in?)
>> Not sure if this is relevant.
>> 
>> Heres part of the strace output:
>> 
>> stat("./readline.rb", 0x7fffffffaad0)   = -1 ENOENT (No such file or
>> directory)
>> stat("./readline.so", 0x7fffffffaad0)   = -1 ENOENT (No such file or
>> directory)
> 
> You need the readline extension - you can get it by going
> into the ext/readline subdirectory of the source and doing a
> 'make ; make install' - though you'll need the C readline library
> installed too.
> 
Hmmm. make in the ext/readline directory just says "nothing to do".
The target for all or install is simply the Makefile itself:

all install: Makefile

Which I would guess means that the mf is not built properly - but I'm
confused now.  configure at the top level has no reference to readline.

UPDATE: in case anyone is intereted!

Thanks, Dick!

What I had to do was to edit ext/Setup, and uncomment the "#readline" line
(by removing the '#'), then at the top level, make install again, et voila,
irb now has vi-style command line editing (and is now much more useful, for
me at least).

I dare say this is documented, but I was too feeble to find it!

Thanks
Graham Nicholls
-- 
The answer's always "Yes".
Now, what was the question?


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