[NTG-context] \sometxt in staticMPfigure

[Hans Hagen]

Sanjoy Mahajan wrote:
>> you can test the beta
>>     
>
> This gives the clearboxes error:
>
> =================== box.tex ===================
> \startMPinclusions
>   input boxes
> \stopMPinclusions
>
> \starttext
> \startstaticMPfigure{fig}
>   boxit.h(btex h etex);
>   drawboxed(h);
> \stopstaticMPfigure
> \usestaticMPfigure[fig]
> \stoptext
> =====================================
>
> The cause is that it produces this intermediate mp file:
>
> ========= box-fig.mp ===============
> input boxes
> boxit.h(btex h etex);
> drawboxed(h);
> ===================================
>
> This fails because all three lines go into a beginfig..endfig and
> metapost fails.  That may be a metapost bug in this case, but for
> robustness I think it should become:
>
> input boxes
> beginfig(1)
> boxit.h(btex h etex);
> drawboxed(h);
> endfig;
> end
>
> In order to do that transformation, box-fig.mp would need separate
> sections for the inclusions and for the main figure code.
>
> Am I using inclusions incorrectly?  i.e. Should I instead use
> MPextensions to get material placed at the top of the metapost file
> for use by all figures?  Like this:
>
> =============== box-e.tex ================
> \startMPextensions
>   input boxes
> \stopMPextensions
>
> \starttext
> \startstaticMPfigure{fig}
>   boxit.h(btex h etex);
>   drawboxed(h);
> \stopstaticMPfigure
> \usestaticMPfigure[fig]
> \stoptext
> =======================================
>
> But that produces 
>
>   (texexec-mpgraph.mp
>   >> boxit.h
>   ! Isolated expression.
>   <to be read again> 
> 		     (
>   l.148  boxit.h(
> 		 btex  h etex
>   ? 
>
> because the added extensions ('input boxes') are not included in
> texexec-mpgraph.mp.
>   
the problem (if you look into the mp file) is that there is *no* 
beginfig; this is because we now use a more stupid (stripped down) 
variant of saving the graphic.

\startstaticMPfigure{fig}
beginfig(1);
  boxit.h(btex h etex);
  drawboxed(h);
endfig;
\stopstaticMPfigure

i'll add the b/e to the main macro. 

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