Stephan Hennig wrote:
> Hi,
>
> I didn't have the opportunity to touch luaTeX yet, but let me ask one
> question in advance: Since luaTeX has a built-in MetaPost interpreter,
> is it possible to refer to a certain figure in a MetaPost source file
> for inclusion, instead of a compiled figure?
>
> As an example, I would like to say in a TeX document (syntax may differ)
>
> \includeMetaPost{foo.2}
>
> and this should not refer to the pre-compiled file
>
> foo.2
>
> but to section
>
> figure(2);
> ...
> endfig;
>
> in file
>
> foo.mp
>
> and compile it on-the-fly. Would that be possible?
mplib is still just mp so it ptocessed what is passed to it; no
intelligence is added to the mp kernel
however, when using the lib ons is in control over what is passed to it
in the past i did what you describe in metafun by using just a macro
(loadfigure) which filters the image from a file;
in luatex we can be more clever (i admit that i hadn;t yet thought of
replacing the macro -)
using lua we get something ...
function filterfromMPblob(data,number)
return
(data:match(string.format("beginfig%%(%s%%).-endfig",number)) or "") .. " ;"
end
test this with:
str = [[
beginfig(1)
draw fullcircle ;
endfig ;
beginfig(2)
draw fullcircle ;
endfig ;
]]
print(filterfromMPblob(str,2))
glue to tex:
\def\includeMetaPost#1#2% io.loaddata is part of l-io.lua
{\directlua0{tex.print(filterfromMPblob(io.loaddata("#1",#2)))}}
of course this need to be embeded in some general mp support
(i'll add it to my todolist; actually a bit more is involved since one
probably wants to include the data between the figures too since it may
be called upon)
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