Currently the following filetypes are supported by Geany:
Abaqus, Abc, ActionScript, Ada, Asciidoc, ASM, Batch, C, C#, C++, CAML, Clojure, CMake, COBOL, Conf, CSS, CUDA, Cython, D, Diff, Docbook, Erlang, F77, Ferite, Forth, Fortran, FreeBasic, Genie, GLSL, Go, Graphviz, Haskell, Haxe, HTML, Java, Javascript, LaTeX, Lisp, Lua, Make, Markdown, Matlab, NSIS, Objective-C, Pascal, Perl, PHP, Po, PowerShell, Python, R, reStructuredText, Ruby, Rust, Scala, Sh, SQL, Tcl, Txt2tags, Vala, Verilog, VHDL, XML, YAML
https://www.geany.org/
Abaqus, Abc, ActionScript, Ada, Asciidoc, ASM, Batch, C, C#, C++, CAML, Clojure, CMake, COBOL, Conf, CSS, CUDA, Cython, D, Diff, Docbook, Erlang, F77, Ferite, Forth, Fortran, FreeBasic, Genie, GLSL, Go, Graphviz, Haskell, Haxe, HTML, Java, Javascript, LaTeX, Lisp, Lua, Make, Markdown, Matlab, NSIS, Objective-C, Pascal, Perl, PHP, Po, PowerShell, Python, R, reStructuredText, Ruby, Rust, Scala, Sh, SQL, Tcl, Txt2tags, Vala, Verilog, VHDL, XML, YAML
https://www.geany.org/