(line-number-mode): New function and variable.

1 files changed, 16 insertions, 2 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index 9c3a8ecd26e..6577fb92d14 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -1,6 +1,6 @@
 ;;; simple.el --- basic editing commands for Emacs
 
-;; Copyright (C) 1985, 1986, 1987, 1992, 1993 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1986, 1987, 1993 Free Software Foundation, Inc.
 
 ;; This file is part of GNU Emacs.
 
@@ -1865,11 +1865,25 @@ specialization of overwrite-mode, entered by setting the
   (interactive "P")
   (setq overwrite-mode
         (if (if (null arg)
-                (not (eq (overwrite-mode 'overwrite-mode-binary)))
+                (not (eq overwrite-mode 'overwrite-mode-binary))
               (> (prefix-numeric-value arg) 0))
             'overwrite-mode-binary))
   (force-mode-line-update))
 
+(defvar line-number-mode nil
+  "*Non-nil means display line number in mode line.")
+
+(defun line-number-mode (arg)
+  "Toggle Line Number mode.
+With arg, turn Line Number mode on iff arg is positive.
+When Line Number mode is enabled, the line number appears
+in the mode line."
+  (interactive "P")
+  (setq line-number-mode
+        (if (null arg) (not line-number-mode)
+          (> (prefix-numeric-value arg) 0)))
+  (force-mode-line-update))
+
 (defvar blink-matching-paren t
   "*Non-nil means show matching open-paren when close-paren is inserted.")