Waybar: Add package update count module + pacman hook.

.config/waybar/config

@@ -6,6 +6,7 @@
 		"hyprland/workspaces",
 		"tray",
 		"custom/dnd-toggle",
+		"custom/pkg-update-count",
 		"network",
 		"bluetooth",
 		"pulseaudio#output",
@@ -33,6 +34,20 @@
     "tray": {
         // "icon-size": 21,
         "spacing": 8
+    },
+	"custom/pkg-update-count": {
+		"exec": "$HOME/.scripts/waybar-pkg-update-count.sh",
+		"interval": "once",
+		"on-click": "$HOME/.scripts/waybar-pkg-update-count.sh",
+		"signal": 3,
+		"tooltip": false,
+		"return-type": "json",
+		"format": "{icon} {}",
+		"format-icons": {
+			"error": "󰏖",
+			"no-update": "󰏖",
+			"update-available": "󰏖"
+		}
 	},
 	"network": {
         // "interface": "wlp2*", // (Optional) To force the use of this interface

.config/waybar/style.css

@@ -47,6 +47,7 @@
 
 #button,
 #tray,
+#custom-pkg-update-count,
 #network,
 #bluetooth,
 #pulseaudio,
@@ -84,6 +85,7 @@
  	color: @accent1;
 }
 
+#custom-pkg-update-count,
 #network,
 #bluetooth,
 #mpris,
@@ -93,6 +95,7 @@
     color: @accent2;
 }
 
+#custom-pkg-update-count.no-update,
 #pulseaudio.output.muted,
 #pulseaudio.input.source-muted,
 #custom-dnd-toggle.dnd-enabled {
@@ -104,6 +107,10 @@
 	color: @disabled2;
 }
 
+#custom-pkg-update-count.error {
+	color: @bad;
+}
+
 #battery.charging {
     background-color: alpha(@good, 0.33);
 }

.scripts/refresh-waybar-pkg-update-count.hook

@@ -0,0 +1,10 @@
+# Refresh the package update count Waybar module
+[Trigger]
+Operation = Upgrade
+Operation = Remove
+Type = Package
+Target = *
+
+[Action]
+When = PostTransaction
+Exec = pkill -SIGRTMIN+3 -u 1000 waybar

.scripts/waybar-pkg-update-count.sh

@@ -0,0 +1,41 @@
+#!/bin/bash -x
+
+
+# Initiate variables
+retry_count=0
+max_retries=3
+retry_delay=15
+success=0
+
+
+# Retry until success or retry count reaches max_retries
+while [[ $retry_count -le $max_retries && $success -ne 1 ]]; do
+	update_list="$(checkupdates)"
+	case $? in
+		# Update(s) available
+		0)
+			success=1
+			output=$(echo "$update_list" | wc -l)
+			class="update-available"
+			;;
+
+		# No update available
+		2)
+			success=1
+			output=0
+			class="no-update"
+			;;
+
+		*)
+			sleep $retry_delay
+			retry_count+=1
+			output=""
+			class="error"
+			;;
+	esac
+done
+
+
+cat << EOF
+{"text": "$output", "alt": "$class", "tooltip": "$output", "class": "$class"}
+EOF