#25425 - lua does not set search paths

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From: ludo@gnu.org (Ludovic Courtès)
To: Ricardo Wurmus <rekado@elephly.net>
Subject: Re: bug#25425: cannot express search path
References: <87shoo7dgx.fsf@mdc-berlin.de> <87r34879o1.fsf@elephly.net>
 <87bmvc2vjn.fsf@gnu.org> <87lgug72vc.fsf@elephly.net>
Date: Sun, 22 Jan 2017 22:56:29 +0100
In-Reply-To: <87lgug72vc.fsf@elephly.net> (Ricardo Wurmus's message of "Thu,
 12 Jan 2017 15:46:15 +0100")
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Hello!

Ricardo Wurmus <rekado@elephly.net> skribis:

> Ludovic Courtès <ludo@gnu.org> writes:
>
>> I think this should work:
>>
>>        (search-path-specification
>>          (variable "LUA_PATH")
>>          (separator ";")
>>          (files '("share/lua/5.3"))
>>          (file-pattern "\\.lua$")
>>          (file-type 'regular))
>
> I tried this very same thing but it doesn’t work because Lua expects
> placeholders (“?”) in the search paths.  The placeholders are replaced
> with the actual package names.  If the actual file name does not exist
> it will try the next pattern.  If the file *does* exist – which *will* be
> the case for any of the files on LUA_PATH that have been generated by
> the search-path-specification — Lua will try to load the package from
> that path.
>
> This will fail because a search for the “lpeg” module would be satisfied
> by the file “re.lua”, because that’s the first valid file on the
> LUA_PATH.  “re.lua” requires “lpeg” itself, so another lookup is
> performed, which will again result in “re.lua” to be loaded…
>
> AIUI we must generate a value for LUA_PATH that keeps the placeholders
> intact.

So are you saying that it’s important for the question marks to remain
intact?

This sounds terrible.  I’m not sure how to address it, and I don’t feel
like stretching the search path mechanism this much.

Thoughts?

Ludo’.

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#25425 lua does not set search paths