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

14 Mar 2019

      On Thu, Mar 14, 2019 at 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).
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
in mp-mlib.mpiv it seems that we should have
string  LUATEXFUNCTIONALITY ; LUATEXFUNCTIONALITY :=
runscript("mp.print(LUATEXFUNCTIONALITY)") ;
instead of
numeric LUATEXFUNCTIONALITY ; LUATEXFUNCTIONALITY :=
runscript("mp.print(LUATEXFUNCTIONALITY)") ;

Now I have
tex/texmf-context/metapost/context/base/mpiv$ grep -r LUATEXFUNCTIONALITY
mp-mlib.mpiv:%numeric LUATEXFUNCTIONALITY ; LUATEXFUNCTIONALITY :=
runscript("mp.print(LUATEXFUNCTIONALITY)") ;
mp-mlib.mpiv:string  LUATEXFUNCTIONALITY ; LUATEXFUNCTIONALITY :=
runscript("mp.print(LUATEXFUNCTIONALITY)") ;

and your example looks ok.

-- 
luigi

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

luigi scarso