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Subject: Re: Set up external figure for particular image type
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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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<html theme="default-light" iconset="color"><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head><body text="#000000"><span>Thangalin via ntg-context schrieb am 
12.07.2022 um 20:11:</span><br>
<blockquote type="cite" 
cite="mid:CAANrE7q-SG6+fp9TeZ=H_bj=PRVczeTdeeNqd8fdAoJT_DJsbA@mail.gmail.com">
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  <div dir="ltr"><div class="gmail_default" style="font-size:small">Thank
 you for the suggestion Hraban.</div><div class="gmail_default" 
style="font-size:small"><br></div><div class="gmail_default" 
style="font-size:small">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).</div><div class="gmail_default" 
style="font-size:small"><br></div><div class="gmail_default" 
style="font-size:small">One possibility would be something like:</div><div
 class="gmail_default" style="font-size:small"><pre class="gmail-lang-tex gmail-s-code-block"><code class="gmail-hljs gmail-language-latex"><span class="gmail-hljs-keyword">\setupexternalfigure</span>[
    width=1em,
    height=1em,
    order={svg,pdf,png,jpg},
    location={local,default,global},
]

<span class="gmail-hljs-keyword">\defineexternalfigure</span>[png][
    width=<span class="gmail-hljs-keyword">\textwidth</span>,
    height=<span class="gmail-hljs-keyword">\textheight</span>,
]

<span class="gmail-hljs-keyword">\unprotect</span>

<span class="gmail-hljs-keyword">\let</span><span class="gmail-hljs-keyword">\old</span><span class="gmail-hljs-built_in">_</span>externalfigure=<span class="gmail-hljs-keyword">\externalfigure</span>

<span class="gmail-hljs-keyword">\tolerant</span><span class="gmail-hljs-keyword">\def</span><span class="gmail-hljs-keyword">\externalfigure</span>[<span class="gmail-hljs-params">#1</span>]<span class="gmail-hljs-params">#</span>,[<span class="gmail-hljs-params">#2</span>]<span class="gmail-hljs-params">#</span>,[<span class="gmail-hljs-params">#3</span>]{<span class="gmail-hljs-comment">%</span>
    <span class="gmail-hljs-keyword">\doifelseinstring</span>{.png}{<span class="gmail-hljs-params">#1</span>}{<span class="gmail-hljs-comment">%</span>
        <span class="gmail-hljs-keyword">\old</span><span class="gmail-hljs-built_in">_</span>externalfigure[<span class="gmail-hljs-params">#1</span>][png][<span class="gmail-hljs-params">#2</span>]<span class="gmail-hljs-comment">%</span>
    }{<span class="gmail-hljs-comment">%</span>
        <span class="gmail-hljs-keyword">\doifelsefileexists</span>{<span class="gmail-hljs-params">#1</span>.png}{<span class="gmail-hljs-comment">%</span>
            <span class="gmail-hljs-keyword">\old</span><span class="gmail-hljs-built_in">_</span>externalfigure[<span class="gmail-hljs-params">#1</span>.png][png][<span class="gmail-hljs-params">#2</span>]<span class="gmail-hljs-comment">%</span>
        }{<span class="gmail-hljs-comment">%</span>
            <span class="gmail-hljs-keyword">\old</span><span class="gmail-hljs-built_in">_</span>externalfigure[<span class="gmail-hljs-params">#1</span>][<span class="gmail-hljs-params">#2</span>][<span class="gmail-hljs-params">#3</span>]<span class="gmail-hljs-comment">%</span>
        }<span class="gmail-hljs-comment">%</span>
    }<span class="gmail-hljs-comment">%</span>
}
<span class="gmail-hljs-keyword">\protect</span>
</code></pre></div><div class="gmail_default" style="font-size:small">See:
 <a href="https://tex.stackexchange.com/a/650221/2148" 
moz-do-not-send="true">https://tex.stackexchange.com/a/650221/2148</a></div><div
 class="gmail_default" style="font-size:small"><br></div><div 
class="gmail_default" style="font-size:small">I was wondering if there 
was a simpler or a solution that's more the ConTeXt-way?<br></div></div>
</blockquote>
<br>
When you use XML as input you can add additional code to the setups 
block<br>
which uses \externalfigure to load the image.<br>
<br>
<br>
\setupexternalfigures [location={local,global,default}]<br>
<br>
\defineexternalfigure [jpg] [width=4cm]<br>
\defineexternalfigure [png] [width=8cm]<br>
<br>
\starttexdefinition includegraphics #1<br>
<br>
    \splitfilename{#1}<br>
<br>
    \processaction<br>
        [\splitofftype]<br>
        [    jpg=&gt;{\externalfigure[#1][jpg]},<br>
             png=&gt;{\externalfigure[#1][png]},<br>
         default=&gt;{\externalfigure[#1]},<br>
         unknown=&gt;{\externalfigure[#1]}]<br>
<br>
\stoptexdefinition<br>
<br>
%\starttexdefinition includegraphics #1<br>
%<br>
%    \getfiguredimensions[#1]<br>
%<br>
%    \processaction<br>
%        [\figurefiletype]<br>
%        [    jpg=&gt;{\externalfigure[#1][jpg]},<br>
%             png=&gt;{\externalfigure[#1][png]},<br>
%         default=&gt;{\externalfigure[#1]},<br>
%         unknown=&gt;{\externalfigure[#1]}]<br>
%<br>
%\stoptexdefinition<br>
<br>
\starttext<br>
<br>
\includegraphics{hacker.jpg}<br>
<br>
\includegraphics{mill.png}<br>
<br>
\includegraphics{cow.pdf}<br>
<br>
\stoptext<br>
<br>
Wolfgang<br>
<br>
</body></html>

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