kiss: use case statement for update outcomes

kiss

@@ -1425,7 +1425,8 @@ pkg_updates() {
 
     set -f
 
-    contains "$*" kiss && {
+    case " $* " in
+        *" kiss "*)
             log "Detected package manager update"
             log "The package manager will be updated first"
 
@@ -1436,26 +1437,19 @@ pkg_updates() {
 
             log "Updated the package manager"
             log "Re-run 'kiss update' to update your system"
+        ;;
 
-        exit 0
-    }
-
-    [ "$1" ] || {
+        "  ")
             log "Everything is up to date"
-        return
-    }
+        ;;
 
+        *)
             log "Packages to update: $*"
-
-    # Build all packages requiring an update.
-    # See [1] at top of script.
-    # shellcheck disable=2046,2086
-    {
             pkg_update=1
             pkg_build "$@"
-    }
-
             log "Updated all packages"
+        ;;
+    esac
 }
 
 pkg_clean() {