#!/usr/bin/env sh

######################################################################
# @author       : swytch (adapted from Luke Smith - lukesmith.xyz)
# @file         : dwmbar
# @license      : MIT
# @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.
	level="$(amixer sget Master | awk -F "[][]" ' { printf "%s", $2 }' | awk -F "%" '{printf $1}')"
	muted="$(amixer sget Master | awk -F "[][]" '/%/ { printf "%4s", $4 }' | awk '{printf $1}')"

	if [ "$muted" = "off" ]; then
		printf " 婢  ---"
	else
		printf " 墳 %3d%%" $level
	fi

	printf "$delim"

	# Wifi quality percentage and  icon if ethernet is connected.
	wifi="$(grep "^\s*w" /proc/net/wireless | awk '{ printf int($3 * 100 / 70) }')"
	[ $wifi -ne 0 ] && printf "索 %3d%%" $wifi || printf "索  ---"
	eth="$(cat /sys/class/net/enp0s25/operstate)"
	if [ "up" = "$eth" ]; then
		printf " / "
	fi

	printf "$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 [ $AC_ON -eq 0 ]; then
		case "$(cat "$x")" in
			10[1-9])	printf " %3d%%" ;;
			100|9[0-9]|8[0-9])	printf " %3d%%" $(cat "$x") ;;
			7[0-9]|6[0-9])	printf " %3d%%" $(cat "$x") ;;
			5[0-9]|4[0-9])	printf " %3d%%" $(cat "$x") ;;
			3[0-9]|2[0-9])	printf " %3d%%" $(cat "$x") ;;
			*)		printf " %3d%%" $(cat "$x") ;;
		esac
	else
		printf " %3d%%" $(cat "$x")
	fi
	done && printf "$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