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Annotation of 43BSD/contrib/emacs/lisp/tabify.el, revision 1.1

1.1     ! root        1: ;; Tab conversion commands for Emacs
        !             2: ;; Copyright (C) 1985 Richard M. Stallman.
        !             3: 
        !             4: ;; This file is part of GNU Emacs.
        !             5: 
        !             6: ;; GNU Emacs is distributed in the hope that it will be useful,
        !             7: ;; but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: ;; accepts responsibility to anyone for the consequences of using it
        !             9: ;; or for whether it serves any particular purpose or works at all,
        !            10: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
        !            11: ;; License for full details.
        !            12: 
        !            13: ;; Everyone is granted permission to copy, modify and redistribute
        !            14: ;; GNU Emacs, but only under the conditions described in the
        !            15: ;; GNU Emacs General Public License.   A copy of this license is
        !            16: ;; supposed to have been given to you along with GNU Emacs so you
        !            17: ;; can know your rights and responsibilities.  It should be in a
        !            18: ;; file named COPYING.  Among other things, the copyright notice
        !            19: ;; and this notice must be preserved on all copies.
        !            20: 
        !            21: 
        !            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: 
        !            38: (defun tabify (start end)
        !            39:   "Convert multiple spaces in region to tabs when possible.
        !            40: A group of spaces is partially replaced by tabs
        !            41: when this can be done without changing the column they end at.
        !            42: The variable tab-width controls the action."
        !            43:   (interactive "r")
        !            44:   (save-excursion
        !            45:     (save-restriction
        !            46:       (narrow-to-region start end)
        !            47:       (goto-char start)
        !            48:       (while (re-search-forward "[ \t][ \t][ \t]*" nil t)
        !            49:        (let ((column (current-column))
        !            50:              (indent-tabs-mode t))
        !            51:          (delete-region (match-beginning 0) (point))
        !            52:          (indent-to column))))))

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