[MacRuby-devel] require [was: [ANN] The Flying Camera (game)]

[Gabriel Gilder]

Thanks for the tip, Russell, I did not know about the $" variable. I'll have
to revisit my code and see if I can eliminate some redundancy... currently
my code is using File.expand_path to ensure I don't have two different paths
to the same file, but maybe modifying $LOAD_PATH would be more elegant.

-Gabriel


On Sat, Dec 18, 2010 at 1:58 PM, russell muetzelfeldt <
russm-macruby-devel at slofith.org> wrote:

> > Date: Fri, 17 Dec 2010 11:13:35 -0800
> > From: Gabriel Gilder <gabriel at gabrielgilder.com>
> >
> > I ended up solving this problem in my MacRuby app by writing a little
> class
> > to load dependencies - it keeps track of the full file paths of every
> > dependency in a class variable and makes sure to only load a file once
> even
> > if you request it again. Let me know if you would like me to post some
> > sample code...
>
> This is just reinventing Ruby's $" builtin variable - require stores the
> name of files you require in here and doesn't load them if they've been
> loaded already.
>
> If that's not working for you and you're getting errors with library files
> being loaded multiple times, you should check that $: (aka $LOAD_PATH) is
> set correctly and you're not requiring files with relative pathnames. The
> names stored in $" aren't normalised, they're exactly what you passed to
> require, so if you have a file hierarchy like
>
> main.rb
> lib/
>  | foo.rb
>  | bar.rb
>  \ baz/
>    \ asd.rb
>
> where main.rb includes
>
> require './lib/baz/asd'
> require './lib/bar'
>
> and asd.rb has
>
> require '../bar'
>
> then bar will be included twice since '../bar' does not match './lib/bar'.
> what you should do is add the lib directory to $: and then change the
> require lines in main.rb to
>
> require 'baz/asd'
> require 'bar'
>
> and in asd.rb to
>
> require 'bar'
>
> so that the normal mechanism that require uses to only load files once can
> actually work as designed. If for some reason this is impossible, you could
> also change all your require lines from
>
> require '../bar'
>
> to
>
> require File.expand_path('../bar')
>
> which should expand everything out to absolute paths so that (once again)
> the path matching in require can work as designed.
>
>
> cheers
>
> Russell
>
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