[NTG-context] Set up external figure for particular image type

[Wolfgang Schuster]

Thangalin via ntg-context schrieb am 12.07.2022 um 20:11:
> Thank you for the suggestion Hraban.
>
> The source comes from Markdown, which is converted to XML, then 
> typeset using ConTeXt. There's no Markdown-specific mechanism to 
> relate images to a particular external figure definition, 
> unfortunately. All images use the same syntax and are treated the same 
> way. The only part that differs is the file name extension (and header 
> within the file).
>
> One possibility would be something like:
> |\setupexternalfigure[ width=1em, height=1em, order={svg,pdf,png,jpg}, 
> location={local,default,global}, ] \defineexternalfigure[png][ 
> width=\textwidth, height=\textheight, ] \unprotect 
> \let\old_externalfigure=\externalfigure 
> \tolerant\def\externalfigure[#1]#,[#2]#,[#3]{% 
> \doifelseinstring{.png}{#1}{% \old_externalfigure[#1][png][#2]% }{% 
> \doifelsefileexists{#1.png}{% \old_externalfigure[#1.png][png][#2]% 
> }{% \old_externalfigure[#1][#2][#3]% }% }% } \protect |
> See: https://tex.stackexchange.com/a/650221/2148
>
> I was wondering if there was a simpler or a solution that's more the 
> ConTeXt-way?

When you use XML as input you can add additional code to the setups block
which uses \externalfigure to load the image.


\setupexternalfigures [location={local,global,default}]

\defineexternalfigure [jpg] [width=4cm]
\defineexternalfigure [png] [width=8cm]

\starttexdefinition includegraphics #1

     \splitfilename{#1}

     \processaction
         [\splitofftype]
         [    jpg=>{\externalfigure[#1][jpg]},
              png=>{\externalfigure[#1][png]},
          default=>{\externalfigure[#1]},
          unknown=>{\externalfigure[#1]}]

\stoptexdefinition

%\starttexdefinition includegraphics #1
%
%    \getfiguredimensions[#1]
%
%    \processaction
%        [\figurefiletype]
%        [    jpg=>{\externalfigure[#1][jpg]},
%             png=>{\externalfigure[#1][png]},
%         default=>{\externalfigure[#1]},
%         unknown=>{\externalfigure[#1]}]
%
%\stoptexdefinition

\starttext

\includegraphics{hacker.jpg}

\includegraphics{mill.png}

\includegraphics{cow.pdf}

\stoptext

Wolfgang

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