#!/bin/sh -e

# lemonbar takes a formatted string as input
# problem: i want to update different parts in different intervals
# solution: setup fifo and put in information about what should be
# updated. Create main loop that reads fifo, parses information, updates
# what needs to be updated and fills in old information from previous
# runs. feed the result to lemonbar.

FONT="-zevv-peep-medium-r-normal--14-130-75-75-c-70-iso8859-15"

# create fifo
rm -f /tmp/lemonbar.fifo
mkfifo /tmp/lemonbar.fifo

# kill jobs when master script is killed
set +o nohup

# remove fifo when script is killed
trap cleanup 1 2 3 13 15
cleanup() {
    printf "Cleaning up...\n"
    rm -f /tmp/lemonbar.fifo;
}

# update scripts
update_desktop() { printf '%i\n' "$1"; }
update_date() { date +"%Y-%m-%d %H:%M"; }
update_temp() { sysctl -n hw.sensors.cpu0.temp0 | cut -d"." -f1; }
update_load() { sysctl -n vm.loadavg | cut -d" " -f1; }
update_bat() { apm -l; }
update_vol() { mixerctl -n outputs.master; }
update_wname() {
    WNAME=$(wname "$1" || printf "")
    if ! [ -z $WNAME ]; then
        printf '%s' "$WNAME"
    fi
}

# update whenever the desktop tag is changed
xprop -spy -root -notype _NET_CURRENT_DESKTOP | \
while read desktop;
do
    printf "%s\n" "$desktop" | awk '{ print $3 }';
done > /tmp/lemonbar.fifo &

# update whenever the window focus is changed
xprop -spy -root -notype _NET_ACTIVE_WINDOW | \
while read window;
do
    printf "%s\n" "$window" | cut -d"#" -f2;
done > /tmp/lemonbar.fifo &

# update in 60 second intervals
while true;
do
    printf '%s\n' "DATE"
    printf '%s\n' "TEMP"
    printf '%s\n' "LOAD"
    printf '%s\n' "BAT"
    sleep 60
done > /tmp/lemonbar.fifo &

# update once (will then be updated from outside)
print "VOL" >> /tmp/lemonbar.fifo &

# read fifo and create output for lemonbar
while read line;
do
    case $line in
        "DATE") _date=$(update_date); ;; 
        "TEMP") _temp=$(update_temp); ;; 
        "LOAD") _load=$(update_load); ;; 
        "BAT") _bat=$(update_bat); ;; 
        "VOL") _vol=$(update_vol); ;;
        "0x"*) _wname=$(update_wname "$line"); ;; 
        *) _desktop=$(update_desktop "$line"); ;; 
    esac
    printf "[%i] %s %%{r} VOL: %s | BAT: %i%% | LOAD: %s | CPU %i° | %s\n" "$_desktop" "$_wname" "$_vol" "$_bat" "$_load" "$_temp" "$_date"
done < /tmp/lemonbar.fifo | lemonbar -d -f "$FONT" -B "#001800" -F "#CCCCCC"
cleanup