(center-line): New arg NLINES.

Do nothing for lines that are too wide.

1 files changed, 25 insertions, 13 deletions

diff --git a/lisp/textmodes/text-mode.el b/lisp/textmodes/text-mode.el
index aa4e2fc9790..2dd825187ce 100644
--- a/lisp/textmodes/text-mode.el
+++ b/lisp/textmodes/text-mode.el
@@ -141,20 +141,32 @@ See `center-line' for more info."
             (center-line))
         (forward-line 1)))))
 
-(defun center-line ()
+(defun center-line (&optional nlines)
   "Center the line point is on, within the width specified by `fill-column'.
 This means adjusting the indentation so that it equals
-the distance between the end of the text and `fill-column'."
-  (interactive)
-  (save-excursion
-    (let ((lm (current-left-margin))
-          line-length)
-      (beginning-of-line)
-      (delete-horizontal-space)
-      (end-of-line)
-      (delete-horizontal-space)
-      (setq line-length (current-column))
-      (indent-line-to 
-        (+ lm (/ (- fill-column lm line-length) 2))))))
+the distance between the end of the text and `fill-column'.
+The argument NLINES says how many lines to center."
+  (interactive "P")
+  (if nlines (setq nlines (prefix-numeric-value nlines)))
+  (while (not (eq nlines 0))
+    (save-excursion
+      (let ((lm (current-left-margin))
+            line-length)
+        (beginning-of-line)
+        (delete-horizontal-space)
+        (end-of-line)
+        (delete-horizontal-space)
+        (setq line-length (current-column))
+        (if (> (- fill-column lm line-length) 0)
+            (indent-line-to 
+             (+ lm (/ (- fill-column lm line-length) 2))))))
+    (cond ((null nlines)
+           (setq nlines 0))
+          ((> nlines 0)
+           (setq nlines (1- nlines))
+           (forward-line 1))
+          ((< nlines 0)
+           (setq nlines (1+ nlines))
+           (forward-line -1)))))
 
 ;;; text-mode.el ends here