mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
83 lines
2.9 KiB
EmacsLisp
83 lines
2.9 KiB
EmacsLisp
;;; tabify.el --- tab conversion commands for Emacs
|
|
|
|
;; Copyright (C) 1985, 1994 Free Software Foundation, Inc.
|
|
|
|
;; Maintainer: FSF
|
|
|
|
;; 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 2, 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, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; 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)
|
|
(while (search-forward "\t" nil t) ; faster than re-search
|
|
(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.
|
|
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)
|
|
(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
|