Geany + Mythryl >

1) edit ~/.config/geany/filetype_extensions.conf and add:

Mythryl=*.my;

2) create ~/.config/geany/filedefs/filetypes.Mythryl.conf with:

[styling]
number=0x400080;0xffffff;false;false
string=0x008000;0xffffff;false;false
word=0x111199;0xffffff;true;false

[keywords]
primary=print printf if elif else fi case esac for fun package foreach exit show_vals show_pkgs show_api show_api tolower toupper reverse strlen strcat implode reverse map apply head tail explode strsort struniqsort shuffle length

[settings]
extension=my
comment_open=# 
comment_close=
comment_use_indent=true
lexer_filetype=C

I'm experimenting with some other stuff, but that's the absolute minimum that works for me.

notes

For now I'm using bash syntax highlighting. It works just fine except that I cannot use a single-quote within a comment. One single single-quote will colour everything afterwards, so I end up using two. Example: Can''t.

/home/user/.config/geany/filetype_extensions.conf

Mythryl=*.my;