Re: Asymptote or Metapost and ConTeXt parameters.

[Aditya Mahajan <adityam@umich.edu>]

On Fri, 23 Dec 2016, Jaroslav Hajtmar wrote:

> Thanks for sending Your code. It seems that it works with Asymptote. 
> Unfortunately, when I am trying to multiple call a macro then I get 
> fatal error, and then compile collapse. I do not know what it could be.

When called for the first time, the code generates test-ASY.pdf file and 
includes it. After the second call, a new test-ASY.pdf is generated. 
ConTeXt generates an error because the name of the files is the same, but 
the content is not.

There should be an option for \externalfigure to disable this check, but I 
couldn't find it. Here is an alternative approach, that changes the name 
of the PDF.

\usemodule[filter]

\unprotect
\appendtoks
   \setuevalue{set\currentexternalfilter buffer}{\externalfilter@set[\currentexternalfilter]}%
\to \everydefineexternalfilter

\unexpanded\def\externalfilter@set
   {\dodoubleargument\externalfiter@set_indeed}

\starttexdefinition externalfiter@set_indeed [#1][#2]#3
    % #1 = filter
    % #2 = options

    \begingroup
    \edef\currentexternalfilter{#1}

    \setupexternalfilter[#1][\c!name=,#2]

    \externalfilter@set_filenames
    \setbuffer[\externalfilter@buffer_name]#3\endbuffer

    \externalfilter@process_filter
  \stoptexdefinition
\protect

\defineexternalfilter
     [MARKDOWN]
     [
       filtercommand={pandoc -f markdown -t context \externalfilterinputfile\space -o \externalfilteroutputfile},
       cache=yes,
       purge=no,
     ]

\define[1]\NEW
     {\setMARKDOWNbuffer{This is #1}}

\traceexternalfilters

\starttext
\startMARKDOWN
   This is **one**
\stopMARKDOWN

\NEW{**ONE**}

\NEW{_TWO_}
\stoptext

Note that this has the same limitation as using \type{...}. The contents of
\NEW{...} must have matched braces. If this works, I can include the code in
t-filter (mkiv only, as I no longer want to maintain the mkii branch).

Aditya
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