[luatex] Getting the extra primitives?

[Manuel Pégourié-Gonnard]

Taco Hoekwater a écrit :
> Yes. A somewhat more generic solution is this:
> 
> \directlua
>   {
>     tex.enableprimitives('',tex.extraprimitives ())
>     lua.bytecode[1]=function ()
>       function pdfstrcmp (A, B)
>         if A == B then
>           tex.write("0")
>         elseif A < B then
>           tex.write("-1")
>         else
>           tex.write("1")
>         end
>       end
>     end
>     lua.bytecode[1]()
>   }
>  \everyjob{\directlua{lua.bytecode[1]()}}
>  \long\def\pdfstrcmp#1#2{%
>   \directlua
>     {%
>       pdfstrcmp("\luaescapestring{#1}","\luaescapestring{#2}")%
>     }%
>  }
> 
If one wants to use an external file for Lua code (which is probably preferable
when the amount of code is bigger than a few lines), a solution might be

\directlua{
  lua.bytecode[1]=loadfile("latex3-format.lua")
  lua.bytecode[1]()
}
\everyjob{\directlua{lua.bytecode[1]()}}
% TeX code goes here

using the fact that loadfile() returns a function whose body is the content of
the file.

Manuel.