;;; tabify.el --- tab conversion commands for Emacs
-;; Copyright (C) 1985 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1994 Free Software Foundation, Inc.
;; Maintainer: FSF
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
;;; Commentary:
(narrow-to-region (point-min) end)
(goto-char start)
(while (search-forward "\t" nil t) ; faster than re-search
- (let ((start (point))
- (column (current-column))
- (indent-tabs-mode nil))
- (skip-chars-backward "\t")
- (delete-region start (point))
+ (forward-char -1)
+ (let ((tab-beg (point))
+ (indent-tabs-mode nil)
+ column)
+ (skip-chars-forward "\t")
+ (setq column (current-column))
+ (delete-region tab-beg (point))
(indent-to column))))))
+(defvar tabify-regexp "[ \t][ \t]+"
+ "Regexp matching whitespace that tabify should consider.
+Usually this will be \"[ \\t][ \\t]+\" to match two or more spaces or tabs.
+\"^[ \\t]+\" is also useful, for tabifying only initial whitespace.")
+
;;;###autoload
(defun tabify (start end)
"Convert multiple spaces in region to tabs when possible.
(interactive "r")
(save-excursion
(save-restriction
- (narrow-to-region start end)
+ ;; Include the beginning of the line in the narrowing
+ ;; since otherwise it will throw off current-column.
+ (goto-char start)
+ (beginning-of-line)
+ (narrow-to-region (point) end)
(goto-char start)
- (while (re-search-forward "[ \t][ \t][ \t]*" nil t)
+ (while (re-search-forward tabify-regexp nil t)
(let ((column (current-column))
(indent-tabs-mode t))
(delete-region (match-beginning 0) (point))
(indent-to column))))))
+(provide 'tabify)
+
;;; tabify.el ends here