al-skel/home/bin/toggle-caffeine

#!/usr/bin/env bash

# if the script is passed --toggle
if [[ $1 == *toggle* ]] && pgrep caffeine >/dev/null; then
    killall caffeine && exit 0
elif [[ $1 == *toggle* ]]; then
    caffeine &>/dev/null && exit 0
fi

while true; do
    # caffeine is running
    if pgrep caffeine >/dev/null; then
        echo "%{F#0000FF}"
    else
        echo "%{F#FF0000}"
    fi
    sleep 2
done