1 files changed, 50 insertions, 49 deletions

diff --git a/lisp/paren.el b/lisp/paren.el
index f1e66567b0a..221c6aaf5d4 100644
--- a/lisp/paren.el
+++ b/lisp/paren.el
@@ -33,61 +33,62 @@
 ;; Find the place to show, if there is one,
 ;; and show it until input arrives.
 (defun show-paren-command-hook ()
-  (let (pos dir mismatch (oldpos (point))
-            (face (if (face-equal 'highlight 'region)
-                      'underline 'highlight)))
-    (cond ((eq (char-syntax (following-char)) ?\()
-           (setq dir 1))
-          ((eq (char-syntax (preceding-char)) ?\))
-           (setq dir -1)))
-    (save-excursion
-      (save-restriction
-        ;; Determine the range within which to look for a match.
-        (if blink-matching-paren-distance
-            (narrow-to-region (max (point-min)
-                                   (- (point) blink-matching-paren-distance))
-                              (min (point-max)
-                                   (+ (point) blink-matching-paren-distance))))
-        ;; Scan across one sexp within that range.
-        (condition-case ()
-            (setq pos (scan-sexps (point) dir))
-          (error nil))
-        ;; See if the "matching" paren is the right kind of paren
-        ;; to match the one we started at.
-        (if pos
-            (let ((beg (min pos oldpos)) (end (max pos oldpos)))
-              (and (/= (char-syntax (char-after beg)) ?\$)
-                   (setq mismatch
-                         (/= (char-after (1- end))
-                             (logand (lsh (aref (syntax-table)
-                                                (char-after beg))
-                                          -8)
-                                     255))))))
-        ;; If they don't properly match, don't show.
-        (if mismatch
-            (progn
-              (message "Paren mismatch")
-;;;           (setq pos nil)
-              ))))
-    (cond (pos
-           (if show-paren-overlay
-               (move-overlay show-paren-overlay (- pos dir) pos)
-             (setq show-paren-overlay
-                   (make-overlay (- pos dir) pos)))
-           (overlay-put show-paren-overlay 'face face)
-;;; This is code to blink the highlighting.
-;;; It is desirable to avoid this because
-;;; it would interfere with auto-save and gc when idle.
+  (if window-system
+      (let (pos dir mismatch (oldpos (point))
+                (face (if (face-equal 'highlight 'region)
+                          'underline 'highlight)))
+        (cond ((eq (char-syntax (following-char)) ?\()
+               (setq dir 1))
+              ((eq (char-syntax (preceding-char)) ?\))
+               (setq dir -1)))
+        (save-excursion
+          (save-restriction
+            ;; Determine the range within which to look for a match.
+            (if blink-matching-paren-distance
+                (narrow-to-region (max (point-min)
+                                       (- (point) blink-matching-paren-distance))
+                                  (min (point-max)
+                                       (+ (point) blink-matching-paren-distance))))
+            ;; Scan across one sexp within that range.
+            (condition-case ()
+                (setq pos (scan-sexps (point) dir))
+              (error nil))
+            ;; See if the "matching" paren is the right kind of paren
+            ;; to match the one we started at.
+            (if pos
+                (let ((beg (min pos oldpos)) (end (max pos oldpos)))
+                  (and (/= (char-syntax (char-after beg)) ?\$)
+                       (setq mismatch
+                             (/= (char-after (1- end))
+                                 (logand (lsh (aref (syntax-table)
+                                                    (char-after beg))
+                                              -8)
+                                         255))))))
+            ;; If they don't properly match, don't show.
+            (if mismatch
+                (progn
+                  (message "Paren mismatch")
+    ;;;       (setq pos nil)
+                  ))))
+        (cond (pos
+               (if show-paren-overlay
+                   (move-overlay show-paren-overlay (- pos dir) pos)
+                 (setq show-paren-overlay
+                       (make-overlay (- pos dir) pos)))
+               (overlay-put show-paren-overlay 'face face)
+    ;;; This is code to blink the highlighting.
+    ;;; It is desirable to avoid this because
+    ;;; it would interfere with auto-save and gc when idle.
 ;;;        (while (sit-for 1)
 ;;;          (overlay-put show-paren-overlay
 ;;;                       'face
 ;;;                       (if (overlay-get show-paren-overlay
 ;;;                                        'face)
 ;;;                           nil face)))
-           )
-          (t
-           (and show-paren-overlay (overlay-buffer show-paren-overlay)
-                (delete-overlay show-paren-overlay))))))
+               )
+              (t
+               (and show-paren-overlay (overlay-buffer show-paren-overlay)
+                    (delete-overlay show-paren-overlay)))))))
 
 (add-hook 'post-command-hook 'show-paren-command-hook)