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;;; tabify.el --- tab conversion commands for XEmacs
;; Copyright (C) 1985, 1994 Free Software Foundation, Inc.
;; Maintainer: FSF
;; This file is part of XEmacs.
;; XEmacs 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 2, or (at your option)
;; any later version.
;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the Free
;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
;; 02111-1307, USA.
;;; Synched up with: FSF 19.34.
;;; Commentary:
;; Commands to optimize spaces to tabs or expand tabs to spaces in a region
;; (`tabify' and `untabify'). The variable tab-width does the obvious.
;;; Code:
;;;###autoload
(defun untabify (start end)
"Convert all tabs in region to multiple spaces, preserving columns.
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")
(save-excursion
(save-restriction
(narrow-to-region (point-min) end)
(goto-char start)
(let ((percent 5))
(while (search-forward "\t" nil t) ; faster than re-search
(let ((tab-beg (point))
(column (current-column))
(indent-tabs-mode nil))
(skip-chars-backward "\t" start)
(delete-region tab-beg (point))
;; XEmacs change -- show progress
(indent-to column)
(if (> (/ (* 100 (- (point) start)) (- (point-max) start)) percent)
(progn
(message "untabify: %d%% ..." percent)
(setq percent (+ 5 percent)))))))
(message "untabify: done")))
nil)
;;;###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.
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")
(save-excursion
(save-restriction
;; 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)
(let ((percent 5))
(while (re-search-forward "[ \t][ \t][ \t]*" nil t)
(let ((column (current-column))
(indent-tabs-mode t))
(delete-region (match-beginning 0) (point))
;; XEmacs change -- show progress
(indent-to column)
(if (> (/ (* 100 (- (point) start)) (- (point-max) start)) percent)
(progn
(message "tabify: %d%% ..." percent)
(setq percent (+ 5 percent)))))))
(message "tabify: done"))))
(provide 'tabify)
;;; tabify.el ends here
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