From: ghorner <gabriel.horner@...>
Date: 2011-01-11T18:40:21+09:00
Subject: Re: ripl - an irb alternative - 0.3.0 released

On Jan 9, 6:17 am, Michal Suchanek <hramr...@centrum.cz> wrote:
> On 8 January 2011 16:40, Gabriel Horner <gabriel.hor...@gmail.com> wrote:
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> > Michal Suchanek wrote in post #973296:
> >> On 8 January 2011 06:10, ghorner <gabriel.hor...@gmail.com> wrote:
> >>> On Jan 7, 5:18 am, Michal Suchanek <hramr...@centrum.cz> wrote:
> >>>> On 7 January 2011 10:55, ghorner <gabriel.hor...@gmail.com> wrote:
>
> >>>> >> > correctly, then the problem must be you can't find it. What does the
> >>>> > It reports a missing readline.h:
> >>>> versioned readline shared library is always installed as dependecy of
> >>>> many packages).
>
> >>> Unfortunately, none of this helps but to illustrate what you've
> >>> already said. If 5.2 is the readline version you're using, you should
> >>> consider upgrading. I'm on readline 6.1 and have only used bond with
> >>> readline >= 5.6.
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> >>> debian is possibly placing it outside the gem's directory.
> >> As expected
> >> /var/lib/gems/1.8/gems/bond-0.3.5/lib/readline_line_buffer.so
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> >> is present only in the case when libreadline5-dev was present while
> >> installing the bond gem.
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> >> However, there is no difference in the dem install output.
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> >> So bond does not report any error to the user when the library is not
> >> found, and it finds it just fine when it is installed.
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> >> Searching for the file does no help but to illustrate what I have
> >> already seen. Bond silently installs broken extension when readline
> >> development files are not present. Perhaps you should fail the build
> >> when readline is not available but the Ruby interpreter does not
> >> provide it or you should print the message to standard error rather
> >> than standard ouput.
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> > I'm happy to take patches if you figure out why readline.h is still
> > being detected without a readline-dev package.
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> It's not detected.
>
> The extension is installed with thee dummy_makefile option when no
> readline is found.
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> It's clear from the extconf file link you posted:
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> https://github.com/cldwalker/bond/blob/master/ext/readline_line_buffe...
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> Then the extension cannot be loaded, obviously.
>
> When gem installation succeds rubygems consumes all output so the
> message you put in extconf.rb is not displayed.
>
> With this patch installation fails when readline is not found and the
> message is shown then,
>
> Instead of false you might want to include a check for an extconf
> argument (such as --without-readline) that forces instaltion of the
> gem even when readline is not present and is required for the
> extension to be fully functional.
>
> --- ext/readline_line_buffer/extconf.rb.orig    1970-01-01 01:00:00.000000000 +0100
> +++ ext/readline_line_buffer/extconf.rb 2011-01-09 12:08:52.000000000 +0100
> @@ -11,9 +11,9 @@
>    dir_config("readline")
>    have_library('readline')
>    if !have_header('readline/readline.h')
> -    puts "Bond was built without readline. To use it with readline:
> gem install bond" +
> +    puts "Bond requires readline on this version of Ruby. To specify
> readline location use:\ngem install bond" +
>        " -- --with-readline-dir=/path/to/readline"
> -    dummy_makefile
> +    false
>    else
>      create_makefile 'readline_line_buffer'
>    end

Thanks for the feedback. bond 0.4.0 comes with a --without-readline
and fails hard.

> > Did you try gem install bond -- --with-readline-lib=/path/to/your/lib
> > --with-
> > readline-include=/path/to/your/include ?
>
> Don't need that. Readline is detected correctly when present.

So I'm guessing autocompletion works correctly with ripl for your
readline?

If it doesn't, there's a pure ruby readline you can use with ripl:

    gem install ripl rb-readline -- --without-readline

Then, add to your ~/.riplrc:

    Ripl.config[:readline] = 'rb-readline'
    Ripl.config[:completion] = {:readline => :ruby }

Gabriel