#!/usr/bin/env zsh

PANEL_FIFO="$1"
PREFIX="$2"
DELAY="$3"
MOUNTPOINTS=($(echo "$4" | tr ";" "\n"))
ICONS=($(echo "$5" | tr ";" "\n"))
typeset -A ICON_MAP=(${MOUNTPOINTS:^ICONS})

exec 5>"$PANEL_FIFO"

main() {
    local data=$(df -H)

    RESULT=()
    for mountpoint in $MOUNTPOINTS; do
        local icon="${ICON_MAP[$mountpoint]}"
        local size="$(echo "$data" | awk "\$6 == \"$mountpoint\" {print \$4}")"
        RESULT+=("$icon $size")
    done

    REPLY="$(printf "%s " "${RESULT[@]}")"
}

while :; do
    main
    echo "$PREFIX $REPLY" >&5
    sleep "$DELAY"
done