From: Alex Young <alex@...>
Date: 2012-03-19T20:06:26+09:00
Subject: [ruby-core:43467] Re: [ruby-trunk - Feature #4523] Kernel#require to return the path of the loaded file

On 18/03/12 10:22, nobu wrote:
>
> Issue #4523 has been updated by nobu.
>
>
> I don't think it's useful if it may return false.

On the contrary - if it returns false, you know the set of loaded files 
hasn't changed.  You (should) know that no new ruby has been parsed.

> What's the use case?
> I agree that the way to know the loaded path would be useful sometimes, but this doesn't seem nice.

The specific thing I was trying to do was gather all the required files 
into a SQLite database.  Then a later process with an overridden 
`require` can load *precisely* the same file content from that database, 
without ambiguity.

Without this patch, in order to figure out which file was actually 
loaded, you have to duplicate the $LOAD_PATH file search logic, which is 
a nasty, hacky duplication of functionality which can break if 
require's filename resolution logic ever changes.  With it, you're 
guaranteed a correct value.  Given that it doesn't break anything (that 
I know of), and it's such a tiny patch, I honestly don't see a down-side.

-- 
Alex

> ----------------------------------------
> Feature #4523: Kernel#require to return the path of the loaded file
> https://bugs.ruby-lang.org/issues/4523#change-24910
>
> Author: regularfry
> Status: Feedback
> Priority: Normal
> Assignee:
> Category:
> Target version:
>
>
> =begin
> It's very useful to be able to tell which actual file on disc was loaded following a call to require, without having to manually traverse $LOAD_PATH. This information is also not guaranteed to be in $LOADED_FEATURES.
>
> The attached patch alters rb_require_safe's return value to indicate the loaded file iff a file is actually loaded.
> =end
>
>
>