Add waybar function for apt

Can fetch the current number of available package updates, then allow
installation by clicking.

waybar/waybar-apt.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+if [ "$1" == 'bar' ]; then
+	if [ ! -e ${HOME}/.spool/apt-upgradeable ]; then
+		sudo apt update >/dev/null 2>/dev/null
+		COUNT=`apt list --upgradable 2> /dev/null | wc -l`
+		let COUNT--
+		echo $COUNT > /home/jpm/.spool/apt-upgradeable
+	else
+		COUNT=`cat ${HOME}/.spool/apt-upgradeable`
+	fi
+	if [ $COUNT -eq 0 ]; then
+		echo '{"text": "🗹", "tooltip": "Up-to-date", "class": "up-to-date"}'
+	else
+		echo '{"text": "⭳ '$COUNT'", "tooltip": "'$COUNT' updates available (click to download)", "class": "updateable"}'
+	fi
+elif [ "$SUDO_USER" != '' ]; then
+	echo "Don't run with sudo. Run normally, but with a sudoer user"
+elif [ $UID -eq 0 ]; then
+	echo "Don't run as root. Run normally, but with a sudoer user"
+elif [ "$1" == 'upgrade' ]; then
+	/usr/bin/uxterm -e "sudo apt-get update && sudo apt-get full-upgrade -y && sudo apt-get autoremove -y && sudo apt-get clean -y && exit"
+	COUNT=`apt list --upgradable 2> /dev/null | wc -l`
+	let COUNT--
+	echo $COUNT > /home/jpm/.spool/apt-upgradeable
+elif [ "$1" == 'update' ]; then
+	sudo apt update >/dev/null 2>/dev/null
+	COUNT=`apt list --upgradable 2> /dev/null | wc -l`
+	let COUNT--
+	echo $COUNT > /home/jpm/.spool/apt-upgradeable
+else
+	echo "Missing argument: update, upgrade"
+fi