[NTG-context] Can't use MetaFun with mplib anymore

Henri Menke henrimenke at gmail.com
Thu Mar 14 10:00:04 CET 2019


On 3/14/19 8:49 PM, Hans Hagen wrote:
> On 3/14/2019 5:56 AM, Henri Menke wrote:
>>
>> Dear list,
>>
>> Something has changed in MetaFun and it can no longer be used in plain
>> LuaTeX,
>> with neither of
>>
>>      luatex test.tex
>>      mtxrun --script plain test.tex
>>
>> This is the error:
>>
>>      >> LUATEXFUNCTIONALITY
>>      >> "mp.print(LUATEXFUNCTIONALITY)"
>>      ! Equation cannot be performed (numeric=string).
> 
> hm, that can be
> 
> mp.print(LUATEXFUNCTIONALITY or 0)
> 
> but ... i'm surprised you can use metafun in plain at all ... i never
> test that and to be honest am not too motivated to support mpiv code in
> generic either .. better use

Until TeX Live 2018, MetaFun worked in plain (at least the subset I'm
using).  It would be a shame if the support would end.  I also think
that there are quite a number of users.  The number of posts on TeX
Stack Exchange mentioning luamplib with metafun is not negligible.
https://tex.stackexchange.com/search?q=mplibsetformat

I (and probably a lot of other people) would really appreciate if you
could apply Luigi's fix, so we can continue do enjoy MetaFun, even
outside ConTeXt.

Cheers, Henri

> 
> \startMPpage
> \stopMPpage
> 
> with context and then include the pdf
> 
> Hans
> 
>> MWE is below, as always.
>>
>> Cheers, Henri
>>
>> ---
>>
>> \directlua{
>> local mpkpse = kpse.new(arg[0], "mpost")
>>
>> local function finder(name, mode, ftype)
>>      if mode == "w" then
>>          return name
>>      else
>>          return mpkpse:find_file(name,ftype)
>>      end
>> end
>>
>> local mpx = mplib.new {
>>      find_file = finder
>> }
>> local ret = mpx:execute[[
>> boolean mplib ; mplib := true ;
>> input metafun.mp ;
>> ]]
>>
>> print(ret.log)
>> }
>> \bye
>>
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> 
> 



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