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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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173
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6 ;; Maintainer: Hrvoje Niksic <hniksic@srce.hr>
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175
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7 ;; Version 2.2
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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16
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22 ;; along with XEmacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; Synched up with: 19.34 (distributed as delsel.el in FSF)
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27
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28 ;;; Commentary:
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29
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30 ;; Much of this code was revamped by Hrvoje Niksic, July 1997, with
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31 ;; version number set to 2.x.
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32
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33 ;; Pending-del is now a minor mode, with all the normal toggle
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34 ;; functions. It should be somewhat faster, too.
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35
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36
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37 ;;; Code:
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38
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39 (defvar pending-delete-mode nil
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40 "Non-nil when Pending Delete mode is enabled.
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41 In Pending Delete mode, typed text replaces the selected region.")
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42
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43 (defcustom pending-delete-modeline-string " PenDel"
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44 "*String to display in the modeline when Pending Delete mode is active."
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45 :type 'string)
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46
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47 (add-minor-mode 'pending-delete-mode 'pending-delete-modeline-string)
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48
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49
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50 (defun pending-delete-active-region (&optional killp)
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51 (when (and (region-active-p)
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52 (eq (extent-object zmacs-region-extent) (current-buffer))
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53 (not buffer-read-only))
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54 ;; Here we used to check whether the point lies between the
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55 ;; beginning and end of the extent. I don't see how it is
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56 ;; necessary, as the C code makes sure that this is so; it only
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57 ;; slow things down.
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58 (if killp
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59 (kill-region (region-beginning) (region-end))
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60 (delete-region (region-beginning) (region-end)))
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61 (zmacs-deactivate-region)
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62 t))
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63
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64 (defun pending-delete-pre-hook ()
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126
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65 (condition-case e
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66 (let ((type (and (symbolp this-command)
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67 (get this-command 'pending-delete))))
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68 (cond ((eq type 'kill)
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69 (pending-delete-active-region t))
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70 ((eq type 'supersede)
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71 (if (pending-delete-active-region ())
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72 (setq this-command (lambda () (interactive)))))
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126
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73 (type
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74 (pending-delete-active-region ()))))
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126
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75 (error
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76 (warn "Error caught in `pending-delete-pre-hook': %s"
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77 (error-message-string e)))))
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78
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79
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80 (put 'self-insert-command 'pending-delete t)
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81
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82 (put 'yank 'pending-delete t)
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83 (put 'x-yank-clipboard-selection 'pending-delete t)
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84 (put 'toolbar-paste 'pending-delete t)
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85
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86 (put 'delete-backward-char 'pending-delete 'supersede)
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87 (put 'backward-delete-char-untabify 'pending-delete 'supersede)
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88 (put 'delete-char 'pending-delete 'supersede)
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89 (put 'c-electric-delete 'pending-delete 'supersede)
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90
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91 ;; Support the XEmacs 20.3 'delete functions
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92
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93 (put 'backward-or-forward-delete-char 'pending-delete 'supersede)
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94 (put 'cperl-electric-backspace 'pending-delete 'supersede)
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95 (put 'cperl-electric-delete 'pending-delete 'supersede)
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96
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97 ;; Don't delete for these. They're more problematic than helpful.
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98 ;;
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99 ;; (put 'newline-and-indent 'pending-delete t)
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100 ;; (put 'newline 'pending-delete t)
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101 ;; (put 'open-line 'pending-delete t)
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102
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103 (put 'insert-register 'pending-delete t)
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104
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105
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106 ;;;###autoload
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107 (defun turn-on-pending-delete (&optional ignored)
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108 "Turn on pending delete minor mode unconditionally."
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109 (interactive)
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110 (pending-delete-mode 1))
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111
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112 ;;;###autoload
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113 (defun turn-off-pending-delete (&optional ignored)
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114 "Turn off pending delete minor mode unconditionally."
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115 (interactive)
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116 (pending-delete-mode 0))
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117
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118 ;;;###autoload
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119 (defun pending-delete-mode (&optional arg)
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120 "Toggle Pending Delete minor mode.
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121 When the pending delete is on, typed text replaces the selection.
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122 With a positive argument, turns it on.
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123 With a non-positive argument, turns it off."
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124 (interactive "P")
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125 (setq pending-delete-mode
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126 (if (null arg) (not pending-delete-mode)
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127 (> (prefix-numeric-value arg) 0)))
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128 (if pending-delete-mode
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129 (add-hook 'pre-command-hook 'pending-delete-pre-hook)
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130 (remove-hook 'pre-command-hook 'pending-delete-pre-hook))
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131 (force-mode-line-update))
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132
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133
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134 ;; Backward compatibility:
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135 ;;;###autoload
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136 (define-obsolete-function-alias 'pending-delete-on 'turn-on-pending-delete)
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137 ;;;###autoload
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138 (define-obsolete-function-alias 'pending-delete-off 'turn-off-pending-delete)
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139
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140 ;; FSF compatibility:
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141 ;;;###autoload
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142 (define-compatible-function-alias 'delete-selection-mode 'pending-delete-mode)
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143
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144 ;; Compatibility and convenience:
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145 ;;;###autoload
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146 (defalias 'pending-delete 'pending-delete-mode)
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147
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148
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149 ;; The following code used to turn the mode on unconditionally.
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150 ;; However, this is a very bad idea -- since pending-del is
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151 ;; autoloaded, (turn-on-pending-delete) is as easy to add to `.emacs'
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152 ;; as (require 'pending-del) used to be.
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153
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154 ;(pending-delete-on (eq pending-delete-verbose t))
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155
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156 (provide 'pending-del)
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157
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158 ;;; pending-del.el ends here
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