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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
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