<p>The lexers are part of the separate <a href="https://www.scintilla.org/index.html" rel="nofollow">Scintilla project</a> which has all the docs on how to write them.  Note that Geany uses Scintilla 3 not Scintilla 4 so you can't rely on anything thats not backported.</p>
<p>You should get your lexer accepted there first.</p>

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