Add cleanup and more streamlined hook descriptions

hooks/01_snap-pac-uki_pre.hook

@@ -6,7 +6,7 @@ Type = Package
 Target = *
 
 [Action]
-Description = Performing snapper pre snapshot UKI creation...
+Description = Performing pre UKI creation...
 When = PreTransaction
 Exec = /usr/share/libalpm/scripts/snap-pac-uki_create.fish
 AbortOnFail

hooks/zzy_snap-pac-uki_post.hook

@@ -6,6 +6,6 @@ Type = Package
 Target = *
 
 [Action]
-Description = Performing snapper post snapshot UKI creation...
+Description = Performing post UKI creation...
 When = PostTransaction
 Exec = /usr/share/libalpm/scripts/snap-pac-uki_create.fish

hooks/zzz_snap-pac-uki_cleanup.hook

@@ -0,0 +1,11 @@
+[Trigger]
+Operation = Upgrade
+Operation = Install
+Operation = Remove
+Type = Package
+Target = *
+
+[Action]
+Description = Performing UKI cleanup...
+When = PostTransaction
+Exec = /usr/share/libalpm/scripts/snap-pac-uki_cleanup.fish

scripts/snap-pac-uki_cleanup.fish

@@ -0,0 +1,15 @@
+#!/bin/fish
+
+# get snapshots
+set -l config "root"
+set -l snapshot_ids (snapper -c $config --jsonout ls | jq ".$config | .[] | .number")
+
+
+# get current ukis
+set -l ukis (ls /boot/EFI/Linux/ | grep "snap-pac-uki-[1-9][0-9]*\.efi" | grep -o '[1-9][0-9]*')
+
+for x in $ukis
+    if not contains $x $snapshot_ids
+        rm "/boot/EFI/Linux/snap-pac-uki-$x.efi"
+    end
+end