Experiments with 0compile for Pikchr

pikchr.xml

<?xml version="1.0" ?>
<?xml-stylesheet type='text/xsl' href='interface.xsl'?>
<interface uri="https://akavel.github.io/0catalog/feeds/pikchr.xml" xmlns="http://zero-install.sourceforge.net/2004/injector/interface" xmlns:compile="http://zero-install.sourceforge.net/2006/namespaces/0compile">
  <name>Pikchr</name>
  <summary>PIC-like markup language for diagrams in technical documentation</summary>

  <homepage>https://pikchr.org</homepage>

  <!-- based on: https://docs.0install.net/tools/0compile/developers/ -->
  <!-- usage:
    A) Compile and install Pikchr:
      c:> 0install run https://apps.0install.net/0install/0compile.xml autocompile https://akavel.github.io/0catalog/feeds/pikchr.xml

    B) Tweak stuff:
      c:> 0install add 0compile https://apps.0install.net/0install/0compile.xml
      c:> 0compile setup https://akavel.github.io/0catalog/feeds/pikchr.xml pikchr
  -->
  <implementation arch="*-src" version="1.0" id="sha1=1d53a96ee896dfae8d84a2e02fceae2dfac54aaa">
    <file dest="pikchr.c" size="278267" href="https://pikchr.org/home/raw/ec6f88c37683e48a0564e2dd710310253be88d6d9510dd0064ab6030e7fdb973?at=pikchr.c" />
    <command name="compile" path="pikchr.c">
      <runner interface='https://akavel.github.io/0catalog/feeds/zig.xml'>
        <arg>cc</arg>
        <arg>-DPIKCHR_SHELL</arg>
        <!--TODO: how to differentiate extension on Windows/Linux?-->
        <arg>-opikchr.exe</arg>
      </runner>

      <!--TODO: how to differentiate build arch on Windows/Linux?-->
      <compile:implementation arch="Windows-x86_64">
        <command name="run" path="pikchr.exe" />
      </compile:implementation>
    </command>
  </implementation>

</interface>