How to add code highligthing for a new langage?

[Trophime]

Hi,
I wonder how to add support for a new langage.

I would like to give try to presenterm for creating slides for students.
The idea is to present the use of gmsh.

I would like to have basic support for the geo file format of gmsh just like the gmsh-vscode extension .

Thanks for your feedback.
Best

[calebdw]

This uses bat under the hood to actually do all the syntax highlighting. If the language is supported by bat then it should be as easy as #361, otherwise this is in the same boat as #271