[Dev-luatex] "error" in LuaTeX and Lua

[Taco Hoekwater]

Hi (especially Jonathan),

Taco Hoekwater wrote:
> 
> Jonathan Sauer wrote:
>> Hello,
>>
>>>> BTW: loadstring can be passed a chunk name. Is it be possible to do
>>>> the same with \directlua? (to replace "[string "luas[0]"]" above)
>>> Something like \directlua callback chunk {...} you mean?
>> Yes. Maybe \directlua cname {My chunk name} {...} (since it is the name
>> of the chunk, not specifically the name used in the callback/traceback).
> 
> This idea is very interesting.  I have committed an experimental patch
> that extends \directlua syntax so that besides
> 
>     \directlua <number> <general text>
> 
> it also allows a keyword prefix:
> 
>     \directlua name <general text> <number> <general text>
> 
> This allows you to do stuff like this:
> 
>     \directlua name {\jobname-\the\inputlineno} 0 {error('test')}
> 
> Because it is experimental, it only works for \directlua, not
> yet for \latelua.

I have just committed code that implements this same extension for
\latexlua (#1300). Some small tests seem to indicate it works,
but I have not been exhaustive so it would be nice if you could
do some tests as well.

That same commit also introduces a lua array named lua.instancename
that allows

   lua.instancename[0] = "scratch"

so that you can set a global default name for the lua instance.
Explicit chunk names take precedence, of course.

Best wishes,
Taco