newcomment.el (comment-line): New command on C-x C-;.

1 files changed, 32 insertions, 0 deletions

diff --git a/lisp/newcomment.el b/lisp/newcomment.el
index e307eac94eb..aabafc76b9a 100644
--- a/lisp/newcomment.el
+++ b/lisp/newcomment.el
@@ -1451,6 +1451,38 @@ unless optional argument SOFT is non-nil."
 		    (end-of-line 0)
 		    (insert comend))))))))))))
 
+;;;###autoload
+(defun comment-line (n)
+  "Comment or uncomment current line and leave point after it.
+With positive prefix, apply to N lines including current one.
+With negative prefix, apply to -N lines above.  Also, further
+consecutive invocations of this command will inherit the negative
+argument.
+
+If region is active, comment lines in active region instead.
+Unlike `comment-dwim', this always comments whole lines."
+  (interactive "p")
+  (if (use-region-p)
+      (comment-or-uncomment-region
+       (save-excursion
+         (goto-char (region-beginning))
+         (line-beginning-position))
+       (save-excursion
+         (goto-char (region-end))
+         (line-end-position)))
+    (when (and (eq last-command 'comment-line-backward)
+               (natnump n))
+      (setq n (- n)))
+    (let ((range
+           (list (line-beginning-position)
+                 (goto-char (line-end-position n)))))
+      (comment-or-uncomment-region
+       (apply #'min range)
+       (apply #'max range)))
+    (forward-line 1)
+    (back-to-indentation)
+    (unless (natnump n) (setq this-command 'comment-line-backward)))
+
 (provide 'newcomment)
 
 ;;; newcomment.el ends here