[eww] Add packages updates

.config/eww/eww.yuck

@@ -1,4 +1,4 @@
-;  Brightness
+; Brightness
 (deflisten brightness :initial "128" "while :; do cat /sys/class/backlight/amdgpu_bl1/brightness; sleep 0.1; done")
 (defvar brightness-icons '["", "", "", "", "", "", "", "", "", "", "", "", "", "", ""]')
 (defvar brightness-slide false)
@@ -8,10 +8,16 @@
 
 ; DateTime
 (defpoll datetime :interval "1s" "date +'%a %e %b %X'")
-(defpoll month :interval "1m" :initial "0" "date +'%m'")
+(defpoll month :interval "1m" :initial "1" "date +'%m'")
-(defpoll day :interval "1m" :initial "0" "date +'%d'")
+(defpoll day :interval "1m" :initial "1" "date +'%d'")
 (defpoll year :interval "1m" :initial "0" "date +'%Y'")
 
+; Notifications status
+(deflisten nf-enabled :initial "true" "while :; do makoctl mode | grep -q dnd && echo true || echo false; sleep 0.1; done")
+
+; Packages updates
+(deflisten packages-updates :initial '{"count": "-", "class": " "}' "~/.config/eww/scripts/pkg-updates.sh")
+
 ; Window Title
 (deflisten window-title "~/.config/eww/scripts/get-window-title.sh")
 
@@ -19,9 +25,6 @@
 (deflisten workspaces :initial "[]" "~/.config/eww/scripts/get-workspaces.sh")
 (deflisten active-workspace "~/.config/eww/scripts/get-active-workspace.sh")
 
-; Notifications status
-(deflisten nf-enabled :initial "true" "while :; do makoctl mode | grep -q dnd && echo true || echo false; sleep 0.1; done")
-
 
 
 ; Widgets
@@ -34,6 +37,7 @@
              :class "systray"
     )
     (nf-state)
+    (packages-updates)
   )
 )
 
@@ -58,6 +62,14 @@
   )
 )
 
+(defwidget packages-updates []
+  (label :text "󰏖 ${packages-updates.count}"
+         :class "${packages-updates.class}"
+         :tooltip "${packages-updates.tooltip}"
+  )
+)
+
+
 (defwidget bar-middle []
   (label :limit-width 2
          :text "${window-title}"

.config/eww/refresh-pkg-updates.hook

@@ -0,0 +1,10 @@
+# Copy to /etc/pacman.d/hooks/
+[Trigger]
+Operation = Upgrade
+Operation = Remove
+Type = Package
+Target = *
+
+[Action]
+When = PostTransaction
+Exec = /bin/pkill -SIGUSR1 -u 1000 pkg-updates.sh

.config/eww/scripts/pkg-updates.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+# Time in seconds between each check
+interval=3600
+# Number of updates displayed in tooltip
+max_shown=25
+
+
+function check {
+	# Initiate variables
+	declare -i retry_count=0
+	declare -i max_retries=5
+	declare -i retry_delay=30
+	declare -i success=0
+
+	# Retry until success or retry count reaches max_retries
+	while [[ $retry_count -le $max_retries && $success -ne 1 ]]; do
+		cmd_res="$(checkupdates 2>&1)"
+		case $? in
+			# Update(s) available
+			0)
+				success=1
+				count=$(echo "$cmd_res" | wc -l)
+				tooltip="$(echo "$cmd_res" | head -n "$max_shown" | sed -z 's/\n/\\n/g' | sed 's/\\n$//')"
+				if [[ $count -gt $max_shown ]]; then
+					tooltip="$tooltip\n[..] +$((count - max_shown))"
+				fi
+				class=" "
+				;;
+
+			# No update available
+			2)
+				success=1
+				count=0
+				tooltip="No update available."
+				class="disabled"
+				;;
+
+			*)
+				retry_count+=1
+				count=""
+				tooltip="$(echo "$cmd_res" | sed -z 's/\n/\\n/g' | sed 's/\\n$//')"
+				class="error"
+				;;
+		esac
+
+		# Show time of check
+		time="$(date '+%H:%M:%S')"
+		tooltip="$tooltip\n\nLatest check: $time"
+
+		cat <<- EOF
+		{"count": "$count", "tooltip": "$tooltip", "class": "$class"}
+		EOF
+
+		[[ $success -ne 1 ]] && sleep $retry_delay
+	done
+}
+
+declare -i sleep_pid
+
+while :; do
+  check
+  sleep $interval &
+  sleep_pid=$!
+  trap "kill $sleep_pid" USR1
+  wait $sleep_pid
+done