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1 ;; pending-del.el --- Making insertions replace any selected text.
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2
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3 ;; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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4
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5 ;; Author: Matthieu Devin <devin@lucid.com>, 14 Jul 92.
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: Not in FSF.
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24
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25 ;;; Code:
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26
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27 (defvar pending-delete-verbose
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28 1
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29 "*nil disables on/off messages for pending-del mode
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30 1 suppresses messages on loading
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31 t enables all messages")
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32
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33 (defun delete-active-region (&optional killp)
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34 (if (and (not buffer-read-only)
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35 (extentp zmacs-region-extent)
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36 (eq (current-buffer) (extent-buffer zmacs-region-extent))
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37 (extent-start-position zmacs-region-extent)
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38 (<= (extent-start-position zmacs-region-extent) (point))
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39 (<= (point) (extent-end-position zmacs-region-extent)))
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40 (progn
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41 (if killp
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42 (kill-region (extent-start-position zmacs-region-extent)
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43 (extent-end-position zmacs-region-extent))
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44 (delete-region (extent-start-position zmacs-region-extent)
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45 (extent-end-position zmacs-region-extent)))
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46 (zmacs-deactivate-region)
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47 t)))
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48
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49 (defun pending-delete-pre-hook ()
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50 (let ((type (and (symbolp this-command)
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51 (get this-command 'pending-delete))))
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52 (cond ((eq type 'kill)
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53 (delete-active-region t))
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54 ((eq type 'supersede)
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55 (if (delete-active-region ())
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56 (setq this-command '(lambda () (interactive)))))
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57 (type
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58 (delete-active-region ())))))
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59
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60 (put 'self-insert-command 'pending-delete t)
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61
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62 (put 'yank 'pending-delete t)
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63 (put 'x-yank-clipboard-selection 'pending-delete t)
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64
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65 (put 'delete-backward-char 'pending-delete 'supersede)
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66 (put 'backward-delete-char-untabify 'pending-delete 'supersede)
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67 (put 'delete-char 'pending-delete 'supersede)
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68 (put 'c-electric-delete 'pending-delete 'supersede)
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69
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70 ;; Don't delete for these. They're more problematic than helpful.
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71 ;;
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72 ;; (put 'newline-and-indent 'pending-delete t)
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73 ;; (put 'newline 'pending-delete t)
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74 ;; (put 'open-line 'pending-delete t)
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75
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76 (put 'insert-register 'pending-delete t)
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77
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78 ;;;###autoload
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79 (defun pending-delete-on (verbose)
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80 "Turn on pending delete.
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81 When it is ON, typed text replaces the selection if the selection is active.
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82 When it is OFF, typed text is just inserted at point."
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83 (interactive "P")
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84 (add-hook 'pre-command-hook 'pending-delete-pre-hook)
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85 (and verbose
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86 (message "Pending delete is ON, use M-x pending-delete to turn it OFF")))
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87
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88 ;;;###autoload
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89 (defun pending-delete-off (verbose)
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90 "Turn off pending delete.
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91 When it is ON, typed text replaces the selection if the selection is active.
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92 When it is OFF, typed text is just inserted at point."
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93 (interactive "P")
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94 (remove-hook 'pre-command-hook 'pending-delete-pre-hook)
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95 (and verbose (message "pending delete is OFF")))
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96
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97 ;;;###autoload
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98 (defun pending-delete (&optional arg)
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99 "Toggle automatic deletion of the selected region.
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100 With a positive argument, turns it on.
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101 With a non-positive argument, turns it off.
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102 When active, typed text replaces the selection."
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103 (interactive "P")
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104 (let* ((was-on (not (not (memq 'pending-delete-pre-hook pre-command-hook))))
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105 (on-p (if (null arg)
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106 (not was-on)
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107 (> (prefix-numeric-value arg) 0))))
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108 (cond ((eq on-p was-on)
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109 nil)
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110 (on-p
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111 (pending-delete-on pending-delete-verbose))
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112 (t
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113 (pending-delete-off pending-delete-verbose)))))
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114
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115 ;; Add pending-del mode. Assume that if we load it then we obviously wanted
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116 ;; it on, even if it is already on.
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117 (pending-delete-on (eq pending-delete-verbose t))
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118
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119 (provide 'pending-del)
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120
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121 ;;; pending-del.el ends here
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