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/usr/share/kak/rc/base/file.kak is in kakoune 0~2016.12.20.1.3a6167ae-1build1.

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hook global BufOpen .* %{ %sh{
    if [ -z "${kak_opt_filetype}" ]; then
        mime=$(file -b --mime-type "${kak_buffile}")
        case "${mime}" in
            application/*+xml) filetype="xml" ;;
            message/rfc822) filetype="mail" ;;
            text/x-shellscript) filetype="sh" ;;
            text/x-*) filetype="${mime#text/x-}" ;;
            text/*)   filetype="${mime#text/}" ;;
        esac
        if [ -n "${filetype}" ]; then
            printf "set buffer filetype '%s'\n" "${filetype}"
        fi
    fi
} }