home/rc/diff.kak

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hook global BufCreate .*\.(diff|patch) %{
set buffer filetype diff
}
addhl -group / group diff
addhl -group /diff regex "^\+[^\n]*\n" 0:green,default
addhl -group /diff regex "^-[^\n]*\n" 0:red,default
addhl -group /diff regex "^@@[^\n]*@@" 0:cyan,default
hook global WinSetOption filetype=diff %{ addhl ref diff }
hook global WinSetOption filetype=(?!diff).* %{ rmhl diff }