[bpt/emacs.git] / lisp / tabify.el

;; Tab conversion commands for Emacs
;; Copyright (C) 1985 Free Software Foundation, Inc.

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 1, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; 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.


;;;###autoload
(defun untabify (start end)
  "Convert all tabs in region to multiple spaces, preserving columns.
The variable tab-width controls the action."
  (interactive "r")
  (save-excursion
    (save-restriction
      (narrow-to-region start 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))
	  (indent-to column))))))

;;;###autoload
(defun tabify (start end)
  "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.
The variable tab-width controls the action."
  (interactive "r")
  (save-excursion
    (save-restriction
      (narrow-to-region start end)
      (goto-char start)
      (while (re-search-forward "[ \t][ \t][ \t]*" nil t)
	(let ((column (current-column))
	      (indent-tabs-mode t))
	  (delete-region (match-beginning 0) (point))
	  (indent-to column))))))
Commit	Line	Data
a2535589 JA	1	;; Tab conversion commands for Emacs
	2	;; Copyright (C) 1985 Free Software Foundation, Inc.
	3
	4	;; This file is part of GNU Emacs.
	5
	6	;; GNU Emacs is free software; you can redistribute it and/or modify
	7	;; it under the terms of the GNU General Public License as published by
	8	;; the Free Software Foundation; either version 1, or (at your option)
	9	;; any later version.
	10
	11	;; GNU Emacs is distributed in the hope that it will be useful,
	12	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	;; GNU General Public License for more details.
	15
	16	;; You should have received a copy of the GNU General Public License
	17	;; along with GNU Emacs; see the file COPYING. If not, write to
	18	;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
	19
	20
f9f9507e	21	;;;###autoload
a2535589 JA	22	(defun untabify (start end)
	23	"Convert all tabs in region to multiple spaces, preserving columns.
	24	The variable tab-width controls the action."
	25	(interactive "r")
	26	(save-excursion
	27	(save-restriction
	28	(narrow-to-region start end)
	29	(goto-char start)
	30	(while (search-forward "\t" nil t) ; faster than re-search
	31	(let ((start (point))
	32	(column (current-column))
	33	(indent-tabs-mode nil))
	34	(skip-chars-backward "\t")
	35	(delete-region start (point))
	36	(indent-to column))))))
	37
f9f9507e	38	;;;###autoload
a2535589 JA	39	(defun tabify (start end)
	40	"Convert multiple spaces in region to tabs when possible.
	41	A group of spaces is partially replaced by tabs
	42	when this can be done without changing the column they end at.
	43	The variable tab-width controls the action."
	44	(interactive "r")
	45	(save-excursion
	46	(save-restriction
	47	(narrow-to-region start end)
	48	(goto-char start)
	49	(while (re-search-forward "[ \t][ \t][ \t]*" nil t)
	50	(let ((column (current-column))
	51	(indent-tabs-mode t))
	52	(delete-region (match-beginning 0) (point))
	53	(indent-to column))))))