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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: metapost getting broken
Date: Fri, 12 Nov 1999 01:51:08 +0100
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At 05:27 PM 11/11/99 -0500, Ed L. Cashin wrote:
>label I noticed that the mp source was getting broken:

This was corrected recently: 

\long\def\writeMPgraphic#1%
  {\bgroup
   \edef\overlaywidth     {\overlaywidth    \space}%
   \edef\overlayheight    {\overlayheight   \space}%
   \edef\overlaylinewidth {\overlaylinewidth\space}%
   \iflongMPlines
     \let\par=\empty
     \long\def\flush##1##2\par%
       {\ifx##1\relax \else
          \immediate\write\MPwrite{##1##2}%
          \expandafter\flush
        \fi}%
     \flush#1\empty\par\relax\par
   \else
     \long\def\flush##1##2;%
       {\ifx##1\relax \else
          \dowriteMPgraphicline##1##2tex\relax etex\MPend
          \expandafter\flush
        \fi}%
     \flush#1\empty;\relax;%
   \fi
   \egroup}

%D The \type {;} aware method (the \type {\else} branch) also
%D takes care of \type {btex}||\type {etex}, \type
%D {verbatimtex}||\type {etex}.

\def\dowriteMPgraphicline%
  {\futurelet\next\dodowriteMPgraphicline}

\long\def\dodowriteMPgraphicline#1tex#2#3etex#4\MPend%
  {\ifx\next\empty\else\ifx\next\relax\else
     \bgroup
     \let\par=\empty
     \ifx#2\relax
       \immediate\write\MPwrite{#1;}%
       \egroup
     \else
       \convertargument#2#3\to\ascii
       \immediate\write\MPwrite{#1tex \ascii etex}%
       \egroup
       \dowriteMPgraphicline#4tex\relax etex\MPend
     \fi
   \fi\fi}

BTW, in texmf.cnf, you can add: 

  TEX = texexec --batch --once

This makes MP run context! 

Also, I suggest you pass a name to the reuse macro: 

\startreusableMPgraphic{ed} 

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