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- ;;; underline.el --- insert/remove underlining (done by overstriking) in Emacs.
-
- ;; Copyright (C) 1985, 1993 Free Software Foundation, Inc.
-
- ;; Maintainer: FSF
- ;; Keywords: wp
-
- ;; 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:
-
- ;; This package deals with the primitive form of underlining
- ;; consisting of prefixing each character with "_\^h". The entry
- ;; point `underline-region' performs such underlining on a region.
- ;; The entry point `ununderline-region' removes it.
-
- ;;; Code:
-
- ;;;###autoload
- (defun underline-region (start end)
- "Underline all nonblank characters in the region.
- Works by overstriking underscores.
- Called from program, takes two arguments START and END
- which specify the range to operate on."
- ;; XEmacs: FSF doesn't use a '*', a bug? -sb
- (interactive "*r")
- (save-excursion
- (let ((end1 (make-marker)))
- (move-marker end1 (max start end))
- (goto-char (min start end))
- (while (< (point) end1)
- (or (looking-at "[_\^@- ]")
- (insert "_\b"))
- (forward-char 1)))))
-
- ;;;###autoload
- (defun ununderline-region (start end)
- "Remove all underlining (overstruck underscores) in the region.
- Called from program, takes two arguments START and END
- which specify the range to operate on."
- (interactive "*r")
- (save-excursion
- (let ((end1 (make-marker)))
- (move-marker end1 (max start end))
- (goto-char (min start end))
- (while (re-search-forward "_\b\\|\b_" end1 t)
- (delete-char -2)))))
-
- ;; XEmacs: The rest of these functions are not in FSF. I don't see any
- ;; point in removing them. -sb
-
- ;;;###autoload
- (defun unoverstrike-region (start end)
- "Remove all overstriking (character-backspace-character) in the region.
- Called from program, takes two arguments START and END which specify the
- range to operate on."
- (interactive "*r")
- (save-excursion
- (let ((end1 (make-marker)))
- (move-marker end1 (max start end))
- (goto-char (min start end))
- (while (re-search-forward "\\(.\\)\b\\1" end1 t)
- (delete-char -2)))))
-
- ;;;###autoload
- (defun overstrike-region (start end)
- "Overstrike (character-backspace-character) all nonblank characters in
- the region. Called from program, takes two arguments START and END which
- specify the range to operate on."
- (interactive "*r")
- (save-excursion
- (let ((end1 (make-marker)))
- (move-marker end1 (max start end))
- (goto-char (min start end))
- (while (< (point) end1)
- (or (looking-at "[_\^@- ]")
- (insert (char-after (point)) 8))
- (forward-char 1)))))
-
- ;;;###autoload
- (defun ununderline-and-unoverstrike-region (start end)
- "Remove underlining and overstriking in the region. Called from a program,
- takes two arguments START and END which specify the range to operate on."
- (interactive "*r")
- (save-excursion
- ;; This is a piece of nuke-nroff-bs from standard `man.el'.
- (goto-char (point-min))
- (while (search-forward "\b" (max start end) t)
- (let* ((preceding (char-after (- (point) 2)))
- (following (following-char)))
- (cond ((= preceding following)
- ;; x\bx
- (delete-char -2))
- ((= preceding ?\_)
- ;; _\b
- (delete-char -2))
- ((= following ?\_)
- ;; \b_
- (delete-region (1- (point)) (1+ (point)))))))))
-
- ;;; underline.el ends here
-