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Annotation of GNUtools/emacs/lisp/tabify.el, revision 1.1.1.1

1.1       root        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: 
                     21: (defun untabify (start end)
                     22:   "Convert all tabs in region to multiple spaces, preserving columns.
                     23: The variable tab-width controls the action."
                     24:   (interactive "r")
                     25:   (save-excursion
                     26:     (save-restriction
                     27:       (narrow-to-region start end)
                     28:       (goto-char start)
                     29:       (while (search-forward "\t" nil t)       ; faster than re-search
                     30:        (let ((start (point))
                     31:              (column (current-column))
                     32:              (indent-tabs-mode nil))
                     33:          (skip-chars-backward "\t")
                     34:          (delete-region start (point))
                     35:          (indent-to column))))))
                     36: 
                     37: (defun tabify (start end)
                     38:   "Convert multiple spaces in region to tabs when possible.
                     39: A group of spaces is partially replaced by tabs
                     40: when this can be done without changing the column they end at.
                     41: The variable tab-width controls the action."
                     42:   (interactive "r")
                     43:   (save-excursion
                     44:     (save-restriction
                     45:       (narrow-to-region start end)
                     46:       (goto-char start)
                     47:       (while (re-search-forward "[ \t][ \t][ \t]*" nil t)
                     48:        (let ((column (current-column))
                     49:              (indent-tabs-mode t))
                     50:          (delete-region (match-beginning 0) (point))
                     51:          (indent-to column))))))

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