hkbr.zsh

hkbr() {
    if [[ -z $1 ]]
    then
        cat <<END
Usage: hkbr time [audio bitrate or size] [file size]
    value <= 320 is bitrate, > 320 — size
END
        return 1
    fi
    local fs=${3-6144}
    if [[ $1 =~ '.+:.+:.+' ]]
        then ((s = ${1%%:*} * 3600 + ${${1%:*}#*:} * 60 + ${1##*:}))
    elif [[ $1 =~ '.+:.+' ]]
        then ((s = ${1%:*} * 60 + ${1##*:}))
    else
        s=$1
    fi
    if [[ -z $2 ]]
        then echo "$((fs * 8 / s - 120))k"
    elif [[ $2 -le 320 ]]
        then echo "$((fs * 8 / s - $2))k"
    else
        echo "$(( (fs - $2) * 8 / s))k"
    fi
}