Add missing type and group declaration in plantuml-mode

site-lisp/plantuml-mode.el

@@ -75,7 +75,7 @@
 (require 'thingatpt)
 (require 'dash)
 (require 'xml)
-(require 'cl)
+(require 'cl-lib)
 
 (defgroup plantuml-mode nil
   "Major mode for editing plantuml file."
@@ -147,7 +147,9 @@
   :group 'plantuml)
 
 (defcustom plantuml-indent-level tab-width
-  "Indentation level of PlantUML lines")
+  "Indentation level of PlantUML lines"
+  :type 'number
+  :group 'plantuml)
 
 (defcustom plantuml-confirm-overwrite-on-export t
   "Control whether file exporting is allowed to silently overwrite files."
@@ -678,7 +680,7 @@ be generated first."
         (user-error "Export file name %s does not exist yet and export has been denied, aborting"
                     export-file-name)))
 
-    (case system-type
+    (cl-case system-type
       ((windows-nt) (w32-shell-execute "open" export-file-name))
       ((cygwin) (start-process "" nil "cygstart" export-file-name))
       (otherwise (start-process "" nil "xdg-open" export-file-name)))))