From: eden li <eden.li@...>
Date: 2007-05-14T01:09:12+09:00
Subject: Re: Tiny IRB improvement - max-size of return format

Nice patch.  Not to steal your thunder, but you can also mute irb's
response by tacking on "; nil" to the end of a particularly noisy
return result:

>> a = IO.read('somebigfile'); nil
=> nil
>> a.scan(/blah/)
=> ...

On May 13, 10:58 pm, Stian Haklev <shak...@gmail.com> wrote:
> I'm not sure if it's appropriate to post here, but I found this very
> useful, wanted to share it with people, and didn't know where else.
>
> So I use IRB (and script/console) a lot for testing out regexps or small
> code blocks, inspecting running Rails apps, and so on. One thing that
> can be very annoying is when you run a command like
>
> IRB> a = File.read("bigfile.txt")
>
> and IRB spits out the entire contents of the file. The same happens when
> you do
>
> user = User.find_by_name("Stian")
>
> in script/console, and the whole user object is inspected, often with
> his/her files, messages, permissions etc added in
>
> As far as I know, there is only a way of turning this return off, but
> not of limiting it. I tried turning it off, but found myself doing
>
> IRB> MD5::md5("Peter")
> IRB>
>
> over and over, which was annoying. So I wrote this little patch:
>
> diff -r ../1.8-stian/irb/context.rb ./irb/context.rb
> 37,38d36
> <       @max_output_size = (IRB.conf[:MAX_OUTPUT_SIZE] ?
> IRB.conf[:MAX_OUTPUT_SIZE] : 500)
> <
> 119d116
> <     attr_accessor :max_output_size
> diff -r ../1.8-stian/irb.rb ./irb.rb
> 297c297
> <         text = sprintf @context.return_format,
> @context.last_value.inspect
> --->         printf @context.return_format, @context.last_value.inspect
>
> 299c299
> <         text = sprintf @context.return_format, @context.last_value
> --->         printf @context.return_format, @context.last_value
>
> 301d300
> <       puts text[0...@context.max_output_size]
>
> --
>
> works on both Ruby 1.8.4 and 1.8.6. Basically it adds a new conf. option
> - max_output_size, which defaults to 500, and restricts all results
> based on this. Note that you can still see the whole thing by p object,
> etc.
>
> I just wanted to share it, because I found it very useful. And it's neat
> to be able to hack on "Ruby" itself, even in a tiny way :)
>
> thanks
> Stian
>
> --
> Posted viahttp://www.ruby-forum.com/.