From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#25425: cannot express search path
Date: Sun, 22 Jan 2017 22:56:29 +0100
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To: Ricardo Wurmus <rekado@elephly.net>
Cc: 25425@debbugs.gnu.org

Hello!

Ricardo Wurmus <rekado@elephly.net> skribis:

> Ludovic Court=C3=A8s <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=E2=80=99t work because Lua expe=
cts
> placeholders (=E2=80=9C?=E2=80=9D) 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 =E2=80=93 which *=
will* be
> the case for any of the files on LUA_PATH that have been generated by
> the search-path-specification =E2=80=94 Lua will try to load the package =
from
> that path.
>
> This will fail because a search for the =E2=80=9Clpeg=E2=80=9D module wou=
ld be satisfied
> by the file =E2=80=9Cre.lua=E2=80=9D, because that=E2=80=99s the first va=
lid file on the
> LUA_PATH.  =E2=80=9Cre.lua=E2=80=9D requires =E2=80=9Clpeg=E2=80=9D itsel=
f, so another lookup is
> performed, which will again result in =E2=80=9Cre.lua=E2=80=9D to be load=
ed=E2=80=A6
>
> AIUI we must generate a value for LUA_PATH that keeps the placeholders
> intact.

So are you saying that it=E2=80=99s important for the question marks to rem=
ain
intact?

This sounds terrible.  I=E2=80=99m not sure how to address it, and I don=E2=
=80=99t feel
like stretching the search path mechanism this much.

Thoughts?

Ludo=E2=80=99.