![](https://secure.gravatar.com/avatar/386a116d129cdc597f2bb6210bbaff7a.jpg?s=120&d=mm&r=g)
On Thu, Mar 14, 2019 at 5:56 AM Henri Menke
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