Tabify and untabify apply to the entire buffer (with patch)

[Matthias Meulien <orontee@gmail.com>]

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With emacs 24.3, `C-u M-=' now counts lines/words/characters in the
entire buffer. I suggest that the functions `untabify' and `tabify' from
lisp/tabify.el may accept such an optional argument to apply to the
entire buffer.

A patch is attached to this message.

Thanks for reading,
-- 
Matthias Meulien

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From 64a03c29af49f38a6c2f31fb619a8c342b6316f8 Mon Sep 17 00:00:00 2001
From: Matthias Meulien <orontee@gmail.com>
Date: Thu, 21 Mar 2013 01:51:06 +0100
Subject: [PATCH] Tabify and untabify apply to the entire buffer

---
 lisp/tabify.el | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/lisp/tabify.el b/lisp/tabify.el
index 6bf45b3..a90bf80 100644
--- a/lisp/tabify.el
+++ b/lisp/tabify.el
@@ -28,12 +28,17 @@
 ;;; Code:
 
 ;;;###autoload
-(defun untabify (start end)
+(defun untabify (start end &optional arg)
   "Convert all tabs in region to multiple spaces, preserving columns.
+If called interactively with prefix ARG, convert for the entire
+buffer.
+
 Called non-interactively, the region is specified by arguments
 START and END, rather than by the position of point and mark.
 The variable `tab-width' controls the spacing of tab stops."
-  (interactive "r")
+  (interactive (if current-prefix-arg
+		   (list (point-min) (point-max) current-prefix-arg)
+		 (list (region-beginning) (region-end) nil)))
   (let ((c (current-column)))
     (save-excursion
       (save-restriction
@@ -56,14 +61,19 @@ Usually this will be \" [ \\t]+\" to match a space followed by whitespace.
 \"^\\t* [ \\t]+\" is also useful, for tabifying only initial whitespace.")
 
 ;;;###autoload
-(defun tabify (start end)
+(defun tabify (start end &optional arg)
   "Convert multiple spaces in region to tabs when possible.
 A group of spaces is partially replaced by tabs
 when this can be done without changing the column they end at.
+If called interactively with prefix ARG, convert for the entire
+buffer.
+
 Called non-interactively, the region is specified by arguments
 START and END, rather than by the position of point and mark.
 The variable `tab-width' controls the spacing of tab stops."
-  (interactive "r")
+  (interactive (if current-prefix-arg
+		   (list (point-min) (point-max) current-prefix-arg)
+		 (list (region-beginning) (region-end) nil)))
   (save-excursion
     (save-restriction
       ;; Include the beginning of the line in the narrowing
-- 
1.8.2