kakoune/src/rc/mail.kak

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hook global BufOpen .* %{ %sh{
mimetype="$(file -b --mime-type ${kak_bufname})"
if [[ "${mimetype}" == "message/rfc822" ]]; then
echo setb filetype mail;
fi
} }
hook global WinSetOption filetype=mail %~
addhl group mail-highlight
addhl -group mail-highlight regex ^(From|To|Cc|Bcc|Subject|Reply-To|In-Reply-To):([^\n]*(?:\n\h+[^\n]+)*)$ 1:keyword 2:attribute
addhl -group mail-highlight regex <[^@>]+@.*?> 0:string
addhl -group mail-highlight regex ^>.*?$ 0:comment
~
hook global WinSetOption filetype=(?!mail).* %{
rmhl mail-highlight
}