If one of the other language lexers already in Geany is "close enough" you can make a custom filetype based on those, see the manual.
If none of the existing highlighting is suitable then highlighting is provided by the Scintilla editing widget Geany uses. You can check if that supports either of your languages, Geany does not support all languages Scintilla does. If it does you can make a built-in language using the lexer (C coding needed).
Otherwise you can write a Scintilla lexer (C++ coding needed) and add it as above.
On Tue, 23 Apr 2019 at 05:03, white-wolf email@example.com wrote:
how can créate an personnal syntax highlight for my ToDo List and my personal note on txt mode ?
best regard, White Wolf.
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