#!/bin/sh

######################################################################
# @author      : swytch (adapted from Luke Smith - lukesmith.xyz)
# @file        : dwmbar
# @license     : GPLv3
# @created     : Wednesday May 20, 2020 18:14:14 CEST
#
# @description : set the statusbar in `dwm`
# @dependencies: `xsetroot`
######################################################################


# Handle SIGTRAP signals sent by refbar to update the status bar immediately.
trap 'update' 5

delim="|" # Set the delimiter character.

status() { \
	# Get the volume of ALSA's master volume output.
	volume="$(pamixer --get-volume)"
	muted="$(pamixer --get-mute)"

	if [ "$muted" = "true" ]; then
		echo " muted"
	else
		echo " 墳 $volume%"
	fi

	echo "$delim"

	# Wifi quality percentage and  icon if ethernet is connected.
	grep "^\s*w" /proc/net/wireless | awk '{ print "索", int($3 * 100 / 70) "%" }'
	eth="$(cat /sys/class/net/enp0s25/operstate)"
	if [ "up" = "$eth" ]; then
		echo "/ "
	fi

	echo "$delim"

	# Will show all batteries with approximate icon for remaining power.
	# Or show that the computer is plugged to a power source
	# In any case, show the remaining battery percentage
	AC_ON="$(cat /sys/class/power_supply/AC/online)"
	for x in /sys/class/power_supply/BAT?/capacity;
	do
	if [ "$AC_ON" = 0 ]; then
		case "$(cat "$x")" in
			10[0-9]|101)	echo "" ;;
			100|9[0-9])	echo " $(cat "$x")%" ;;
			8[0-9]|7[0-9])	echo " $(cat "$x")%" ;;
			6[0-9]|5[0-9])	echo " $(cat "$x")%" ;;
			4[0-9]|3[0-9])	echo " $(cat "$x")%" ;;
			*)		echo " $(cat "$x")%" ;;
		esac
	else
		echo " $(cat "$x")%"
	fi
	done && echo "$delim"

	# Date and time.
	date '+%b. %d - %I:%M%p'
	}

update() { \
	# So all that big status function was just a command that quicking gets
	# what we want to be the statusbar. This xsetroot command is what sets
	# it. Note that the tr command replaces newlines with spaces. This is
	# to prevent some weird issues that cause significant slowing of
	# everything in dwm. Note entirely sure of the cause, but again, the tr
	# command easily avoids it.
	xsetroot -name "$(status | tr '\n' ' ')" &
    wait
	}


while :; do
    update
	# Sleep for a minute after changing the status bar before updating it
	# again. We run sleep in the background and use wait until it finishes,
    # because traps can interrupt wait immediately, but they can't do that
    # with sleep.
	sleep 60 &
    wait
done