[Refactor] Refactor enclose-region

Now it doesn’t create unnecessary global variables.

configuration.org

@@ -282,40 +282,38 @@ copied to the kill ring."
 *** Enclose region in a specific character
 
 #+BEGIN_SRC emacs-lisp
-(defun æ-enclose-region (character &optional start end)
-  "Enclose region in CHARACTER. If region is empty, simply inserts
-  CHARACTER two times and moves point between them.
+(defun gpolonkai/enclose-region (character &optional start end)
+  "Enclose region between CHARACTER.
 
-  If character is present in `insert-pair-alist', this function
-  will enclose region in the corresponding pair. In this case,
-  CHARACTER must be the opening member of the pair."
+If region is empty and neither START nor END is set, simply inserts CHARACTER
+two times and moves point between them.
+
+If character is present in `insert-pair-alist', this function will enclose
+region in the corresponding pair.  In this case, CHARACTER must be the opening
+member of the pair."
 
   (interactive "cWhat character? \nr")
 
-  (setq open character close character)
-
-  (let ((pair (assq character insert-pair-alist)))
+  (let ((open character)
+        (close character)
+        (pair (assq character insert-pair-alist)))
     (if pair
         (if (nth 2 pair)
             (setq open (nth 1 pair) close (nth 2 pair))
-          (setq open (nth 0 pair) close (nth 1 pair)))))
+          (setq open (nth 0 pair) close (nth 1 pair))))
+    (unless (and open close)
+      (setq open character
+            close character))
+    (unless (use-region-p)
+      (setq start (point) end (point)))
+    (save-excursion
+      (goto-char end)
+      (insert-char close)
 
-  (unless (and open close)
-    (setq open character)
-    (setq close character))
-
-  (unless (use-region-p)
-    (setq start (point) end (point)))
-
-  (save-excursion
-    (goto-char end)
-    (insert-char close)
-
-    (goto-char start)
-    (insert-char open))
-
-  (unless (use-region-p)
-      (forward-char)))
+      (goto-char start)
+      (insert-char open))
+    (unless (use-region-p)
+      (forward-char))))
 #+END_SRC
 
 *** Convert camelCase to snake_case
@@ -3246,7 +3244,7 @@ directory.  It is available from [[http://plantuml.com/download][here]].
 #+BEGIN_SRC emacs-lisp
 (bind-keys
  :map global-map
- ("M-(" . æ-enclose-region)
+ ("M-(" . gpolonkai/enclose-region)
  ("<C-return>" . open-line-below)
  ("<C-S-return>" . open-line-above)
  ("M-t" . nil) ;; Remove the old keybinding