<p>Geany can detect a document’s filetype from an explicit Emacs-style mode declaration. The docs say:</p>
<blockquote>
<p>The <code>GEANY_DEFAULT_FILETYPE_REGEX</code> default value is <code>-\*-\s*([^\s]+)\s*-\*-</code> which finds Emacs filetypes.</p>
</blockquote>
<p>In fact, this only works if the captured name case-sensitively matches a Geany filetype name. So <code>-*-Sh-*-</code> works, but <code>-*-sh-*-</code> doesn’t. <code>-*-reStructuredText-*-</code> works in Geany, but not in Emacs, which expects <code>-*-rst-*-</code>.</p>
<p>Perhaps the <a href="https://github.com/geany/geany/blob/35a5d457f48c92ecb71b5a2ecf7d718701d5ef63/src/filetypes.c#L119-L188">Geany filetypes table</a> should have an “Emacs mode name” field (like it already has a “human title” field), to be matched case-insensitively.</p>
<p>Failing that, at least the docs should be clarified.</p>

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