lemonbar script

lemonade.sh

#!/bin/bash
export MPD_HOST=~/.mpd/socket
function clock {
    date +"%H:%M"
}
function desktop {
	printf "[%4s]" "$(bspc query -D -d focused --names)"
}
function layout {
    xkb-switch -p
}
function battery {
    BATTERY=/sys/class/power_supply/BAT0
    NOW=$(cat $BATTERY/charge_now)
    FULL=$(cat $BATTERY/charge_full)
    printf "%02d%%" "$((NOW*100/FULL))"
}
function now_playing {
	printf "%.62s" "$(mpc current)"
}
function clock_update {
    while true
    do
	sleep $(( 60 - $(date +%s) % 60 ))
        echo clock_update
    done
}
function bspwm_update {
    bspc subscribe desktop
}
function layout_update {
    xkb-switch -W
}
function now_playing_update {
	while true;
	do
		mpc idle player
		echo
	done
}
function bar {
	echo "%{l}$(desktop) $(now_playing) %{c}$(clock) %{r}$(layout) $(battery)"
}
function bar_update {
	bar
	while read EVENT
	do
	    bar
	done < $UPDATE 
}
UPDATE=/tmp/bar_update
PID_FILE=/tmp/bar_pids

trap "xargs kill < $PID_FILE;rm $PID_FILE" EXIT
if [ -e $PID_FILE ]
then
	echo lemonade.sh exists! >&2
	exit 1
fi
[ -e $UPDATE ] || mkfifo $UPDATE
clock_update > $UPDATE &
echo $! > $PID_FILE
bspwm_update > $UPDATE &
echo $! >> $PID_FILE
layout_update > $UPDATE &
echo $! >> $PID_FILE
now_playing_update > $UPDATE &
echo $! >> $PID_FILE

bar_update| lemonbar -f monospace:size=9