[luatex] Using libraries from luarocks

[Nils Pickert]

Hi

I got a bit further... Now everything runs fine in Lua directly:
Lua 5.3.5  Copyright (C) 1994-2018 Lua.org, PUC-Rio
> exif = require ("exif")
> data = exif.loadfile("DSCF0274.jpg")
> print(data:ifd("0"):entry("DateTime"))
2018:10:12 19:59:32
> print(data:ifd("0"):entry("Make"))
FUJIFILM

But if I run the same from LuaLaTeX with
\directlua{
exif = require("exif")
data = exif.loadfile("DSCF0274.jpg")
tex.print(data:ifd("0"):entry("DateTime"))
}


I get "attempt to index a nil value (global 'data')"
which seems to point at that data is not filled at all, and
exif.loadfile does nothing...

Any pointers on where to look?

Thanks and best regards
Nils



Am 08.10.18 um 18:49 schrieb Nils Pickert:
> Thanks a lot! It seems to work, now I get the same error message as I
> get in naked Lua :-)
> 
> (relinked my symbolic link lualatex to point to luatex53, hoping that it
> does not mess around with the other stuff I am playing with)
> 
> Thanks again!
> Nils
> 
> 
> Am 08.10.18 um 14:52 schrieb luigi scarso:
>>
>>
>> On Mon, Oct 8, 2018 at 2:49 PM Martin Wilhelm Leidig
>> <listwatch at moss.in-berlin.de <mailto:listwatch at moss.in-berlin.de>> wrote:
>>
>>     Am 2018-10-08 um 14.05 schrieb luigi scarso <luigi.scarso at gmail.com
>>     <mailto:luigi.scarso at gmail.com>>:
>>     >
>>     > luatex vs luatex53
>>
>>     Fascinating.  Thanks for the hint!
>>
>>
>> Very likely next texlive will have 
>> "luatex"  with lua 5.3 , and perhaps "luatex54" with lua 5.4
>>
>> -- 
>> luigi
>