kakoune/rc/core/kakrc.kak

hook global BufCreate (.*/)?(kakrc|.*.kak) %{
    set buffer filetype kak
}

addhl -group / regions -default code kakrc \
    comment (^|\h)\K\# $ '' \
    double_string %{(^|\h)"} %{(?<!\\)(\\\\)*"} '' \
    single_string %{(^|\h)'} %{(?<!\\)(\\\\)*'} '' \
    shell '%sh\{' '\}' '\{'

addhl -group /kakrc/code regex \<(hook|rmhooks|addhl|rmhl|exec|eval|source|runtime|def|alias|unalias|decl|echo|edit|set|map|face|prompt|menu|info|try|catch|nameclient|namebuf|cd|colorscheme)\> 0:keyword
addhl -group /kakrc/code regex \<(default|black|red|green|yellow|blue|magenta|cyan|white|(?:rgb:[0-9a-fA-F]{6}))\> 0:value
addhl -group /kakrc/code regex (?:\<hook)\h+(?:(global|buffer|window)|(\S+))\h+(\S+)\h+(\S+)? 1:attribute 2:error 3:identifier 4:string
addhl -group /kakrc/code regex (?:\<set)\h+(?:(global|buffer|window)|(\S+))\h+(\S+)\h+(\S+)? 1:attribute 2:error 3:identifier 4:string
addhl -group /kakrc/code regex (?:\<map)\h+(?:(global|buffer|window)|(\S+))\h+(?:(normal|insert|prompt|menu)|(\S+))\h+(\S+)\h+(\S+)? 1:attribute 2:error 3:attribute 4:error 5:identifier 6:string

addhl -group /kakrc/double_string fill string
addhl -group /kakrc/single_string fill string
addhl -group /kakrc/comment fill comment
addhl -group /kakrc/shell ref sh

hook global WinSetOption filetype=kak %{ addhl ref kakrc }
hook global WinSetOption filetype=(?!kak).* %{ rmhl kakrc }