Revert "Remove (comment) kernel update detection"

This reverts commit 96eb881a28.

update-notify

@@ -8,19 +8,19 @@ fi
 
 arch_updates=$(checkupdates | wc -l)
 aur_updates=$(aur repo -u -d aur-local | wc -l)
-#kernel_update=$(checkupdates | grep linux | grep -v custom | grep -v archlinux | grep -v api | grep -v firmware | wc -l)
+kernel_update=$(checkupdates | grep linux | grep -v custom | grep -v archlinux | grep -v api | grep -v firmware | wc -l)
 
-#if [ "$kernel_update" -eq 0 ]; then
+if [ "$kernel_update" -eq 0 ]; then
-#    kernel_update=$(vercmp `pacman -Si linux | grep Version | cut -d':' -f2` `uname -r`)
+    kernel_update=$(vercmp `pacman -Si linux | grep Version | cut -d':' -f2` `uname -r`)
-#fi
+fi
 
-#built_kernel=$(checkupdates | grep linux-custom | wc -l)
+built_kernel=$(checkupdates | grep linux-custom | wc -l)
 
 updates=$(($arch_updates + $aur_updates))
 
-#if [ "$kernel_update" -ge 1 ] && [ "$built_kernel" -eq 0 ]; then
+if [ "$kernel_update" -ge 1 ] && [ "$built_kernel" -eq 0 ]; then
-#    notify-send "Kernel update available" "Rebuild custom kernel"
+    notify-send "Kernel update available" "Rebuild custom kernel"
-#fi
+fi
 
 if [ "$updates" -ge "$threshold" ]; then
     notify-send "Updates available" "Arch: $arch_updates, AUR: $aur_updates"