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1 ;;; whitespace-mode.el -- minor mode for making whitespace visible
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2
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3 ;; Copyright (C) 1994, 1995, 1996 Heiko Muenkel
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4
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5 ;; Author: Heiko Muenkel <muenkel@tnt.uni-hannover.de>
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6 ;; Keywords: modes, extensions
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your
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13 ;; option) any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; if not, write to the Free Software
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22 ;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: FSF 19.34.
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26
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27 ;;; Commentary:
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28
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29 ;; $Id: whitespace-mode.el,v 1.2 1997/02/22 22:07:27 steve Exp $
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30 ;; Description:
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31 ;;
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32 ;; This is a minor mode, which highlights whitespaces (blanks and
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33 ;; tabs) with different faces, so that it is easier to
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34 ;; distinguish between them.
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35 ;; Toggle the mode with: M-x whitespace-mode
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36 ;; or with: M-x whitespace-incremental-mode
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37 ;; The second one should be used in big files.
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38 ;;
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39 ;; If you want to know how the whitespaces are highlighted then
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40 ;; type: M-x whitespace-show-faces
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41 ;;
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42 ;; There are 2 hook variables `whitespace-incremental-mode-hook'
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43 ;; and `whitespace-mode-hook' to customize the mode.
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44 ;;
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45 ;; Look at the variable `whitespace-chars', if you only want to
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46 ;; highlight tabs or blanks and not both.
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47 ;;
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48 ;; Set `whitespace-install-toolbar-icon' to t, if you want a
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49 ;; toolbar icon for this mode.
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50 ;;
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51 ;; Set `whitespace-install-submenu' to t, if you want a submenu
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52 ;; for this mode. Sorry, at the moment there is no menu for the
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53 ;; Emacs 19.
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54 ;;
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55 ;; Thanks to Mike Scheidler for the toolbar icon code.
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56 ;;
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57 ;; Installation:
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58 ;;
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59 ;; Put the files whitespace-mode.el and adapt.el in one of your
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60 ;; load-path directories and the following lines (without the
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61 ;; comment signs) in your .emacs (adapt.el is already in the
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62 ;; XEmacs 19.12).
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63 ;;
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64 ;; (autoload 'whitespace-mode "whitespace-mode"
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65 ;; "Toggle whitespace mode.
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66 ;; With arg, turn whitespace mode on iff arg is positive.
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67 ;; In whitespace mode the different whitespaces (tab, blank return)
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68 ;; are highlighted with different faces. The faces are:
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69 ;; `whitespace-blank-face', `whitespace-tab-face' and
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70 ;; `whitespace-return-face'."
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71 ;; t)
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72 ;;
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73 ;; (autoload 'whitespace-incremental-mode "whitespace-mode"
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74 ;; "Toggle whitespace incremental mode.
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75 ;; With arg, turn whitespace incremental mode on iff arg is positive.
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76 ;; In whitespace incremental mode the different whitespaces (tab and
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77 ;; blank) are highlighted with different faces. The faces are:
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78 ;; `whitespace-blank-face' and `whitespace-tab-face'.
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79 ;; Use the command `whitespace-show-faces' to show their values.
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80 ;; In this mode only these tabs and blanks are highlighted, which are in
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81 ;; the region from (point) - (window-heigh) to (point) + (window-heigh)."
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82
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83 ;;; Code:
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84
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85 (provide 'whitespace-mode)
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86 (require 'adapt)
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87
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88 ;;; variables:
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89
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90 (defvar whitespace-chars 'tabs-and-blanks
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91 "*Determines, which whitespaces are highlighted.
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92 Valid values are:
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93 'tabs-and-blanks => tabs and blanks are highlighted;
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94 'tabs => only tabs are highlighted;
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95 'blanks => only blanks are highlighted;.
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96
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97 Changing this variable during the whitespace-*-mode is active could lead
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98 to wrong highlighted whitespaces.")
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99
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100 (make-variable-buffer-local 'whitespace-chars)
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101
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102 (defvar whitespace-mode-hook nil
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103 "*Run after the `whitespace-mode' is switched on.")
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104
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105 (defvar whitespace-incremental-mode-hook nil
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106 "*Run after the `whitespace-incremental-mode' is switched on.")
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107
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108
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109 (if (adapt-xemacsp)
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110 (progn
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111
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112 (defvar whitespace-install-toolbar-icon nil
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113 "Set it to t, if a toolbar icon should be installed during loading this file.
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114 The icon calls the function 'whitespace-toolbar-function'.")
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115
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116 (defvar whitespace-install-submenu nil
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117 "Set it to t, if a submenu should be installed during loading this file.")
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118
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119 ))
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120
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121
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122 (defvar whitespace-toolbar-function 'whitespace-incremental-mode
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123 "*The toolbar icon for the whitespace mode calls this function.
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124 Valid values are: 'whitespace--mode and 'whitespace-incremental-mode.")
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125
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126 (defvar whitespace-blank-and-tab-search-string "\\( \\)\\|\\(\t\\)"
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127 "The regexp used to search for tabs and blanks.")
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128
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129 (defvar whitespace-tab-search-string "\t"
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130 "The search string used to find tabs.")
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131
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132 (defvar whitespace-blank-search-string " "
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133 "The search string used to find blanks.")
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134
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135 ;;; Defining faces
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136 (if (facep 'whitespace-blank-face)
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137 nil
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138 (make-face 'whitespace-blank-face)
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139 (set-face-background 'whitespace-blank-face "LightBlue1"))
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140
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141 (if (facep 'whitespace-tab-face)
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142 nil
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143 (make-face 'whitespace-tab-face)
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144 (set-face-background 'whitespace-tab-face "yellow")
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145 (set-face-underline-p 'whitespace-tab-face t))
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146
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147 (defun whitespace-show-faces ()
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148 "Shows the faces used by the `whitespace-mode'."
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149 (interactive)
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150 (save-excursion
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151 (let ((actual-buffer-name (buffer-name (current-buffer)))
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152 (actual-whitespace-chars whitespace-chars)
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153 (whitespace-mode-active (or whitespace-mode
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154 whitespace-incremental-mode))
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155 (buffer (get-buffer-create "*Help*")))
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156 (set-buffer buffer)
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157 (setq whitespace-chars actual-whitespace-chars)
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158 (delete-region (point-min) (point-max))
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159 (insert "In the whitespace minor mode\n"
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160 " this \" ")
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161 (whitespace-highlight-region (1- (point)) (point))
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162 (insert "\" is a blank, highlighted with `whitespace-blank-face' and\n"
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163 " this \"\t")
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164 (whitespace-highlight-region (1- (point)) (point))
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165 (insert "\" is a tab, highlighted with `whitespace-tab-face'.")
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166
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167 (newline 2)
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168 (if (eq whitespace-chars 'blanks)
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169 (insert
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170 "The highlighting of tabs is switched off.\n")
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171 (if (eq whitespace-chars 'tabs)
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172 (insert
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173 "The highlighting of blanks is switched off.\n")))
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174 (newline)
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175 (if whitespace-mode-active
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176 (insert "A whitespace minor mode is active in the buffer\n "
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177 actual-buffer-name
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178 ".\n")
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179 (insert "No whitespace minor mode is active in the buffer\n "
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180 actual-buffer-name
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181 ".\n"))
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182 (show-temp-buffer-in-current-frame buffer)
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183 )))
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184
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185 ;;;
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186 (defun whitespace-highlight-chars-in-region (char-string from to face)
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187 "Highlights the CHAR-STRING in the region from FROM to TO with the FACE."
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188 (while (search-forward char-string end t)
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189 (let ((extent))
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190 (cond ((match-beginning 0)
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191 (setq extent (make-extent (match-beginning 0) (match-end 0)))
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192 (set-extent-face extent face)
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193 ))
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194 (set-extent-property extent 'start-open t)
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195 (set-extent-property extent 'end-open t)
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196 )))
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197
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198 (defun whitespace-highlight-region (from to)
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199 "Highlights the whitespaces in the region from FROM to TO."
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200 (let ((start (min from to))
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201 (end (max from to)))
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202 (save-excursion
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203 ;; (message "Highlighting tabs and blanks...")
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204 (goto-char start)
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205 (cond ((eq whitespace-chars 'tabs-and-blanks)
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206 (while (search-forward-regexp
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207 whitespace-blank-and-tab-search-string end t)
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208 (let ((extent))
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209 (cond ((match-beginning 1) ; blanks ?
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210 (setq extent (make-extent (match-beginning 1)
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211 (match-end 1)))
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212 (set-extent-face extent 'whitespace-blank-face)
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213 )
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214 ((match-beginning 2) ; tabs ?
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215 (setq extent (make-extent (match-beginning 2)
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216 (match-end 2)))
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217 (set-extent-face extent 'whitespace-tab-face)
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218 )
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219 )
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220 (set-extent-property extent 'start-open t)
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221 (set-extent-property extent 'end-open t)
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222 )))
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223 ((eq whitespace-chars 'tabs)
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224 (whitespace-highlight-chars-in-region whitespace-tab-search-string
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225 from
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226 to
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227 'whitespace-tab-face))
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228 ((eq whitespace-chars 'blanks)
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229 (whitespace-highlight-chars-in-region
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230 whitespace-blank-search-string
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231 from
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232 to
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233 'whitespace-blank-face))
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234 (t (error "ERROR: Bad value of whitespace-highlight-char")))
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235 ;; (message "")
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236 )))
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237
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238 (defun whitespace-highlight-buffer ()
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239 "Highlights the whitespaces in the current buffer."
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240 (whitespace-highlight-region (point-min) (point-max))
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241 )
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242
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243 (defsubst whitespace-find-next-highlighted-region (from to)
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244 "Returns nil or the next highlighted region."
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245 (map-extents '(lambda (extent dummy)
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246 (if (extent-property extent 'whitespace-highlighted-region)
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247 extent))
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248 nil
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249 from
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250 to))
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251
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252 (defun whitespace-incremental-highlight (from to)
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253 "Highligthts the region from FROM to TO incremental."
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254 (save-excursion
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255 (goto-char from)
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256 (let ((extent (extent-at (point) nil 'whitespace-highlighted-region))
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257 (next-extent nil)
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258 (start nil))
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259 (while (< (point) to)
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260 (if extent
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261 (goto-char (extent-end-position extent)))
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262 (if (< (point) to)
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263 (progn
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264 (setq start (point))
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265
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266 (setq next-extent (whitespace-find-next-highlighted-region
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267 start
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268 to))
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269 (if extent
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270 (if next-extent
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271 (progn
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272 (set-extent-endpoints extent
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273 (extent-start-position extent)
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274 (extent-end-position next-extent)
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275 )
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276 (whitespace-highlight-region start
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277 (1-
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278 (extent-start-position
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279 next-extent)))
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280 (delete-extent next-extent))
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281 (set-extent-endpoints extent
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282 (extent-start-position extent)
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283 to)
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284 (whitespace-highlight-region start to))
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285 (if next-extent
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286 (progn
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287 (setq extent next-extent)
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288 (whitespace-highlight-region start
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289 (1- (extent-start-position
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290 next-extent)))
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291 (set-extent-endpoints extent
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292 start
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293 (extent-end-position next-extent)))
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294 (setq extent (make-extent start to))
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295 (set-extent-property extent 'whitespace-highlighted-region t)
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296 (whitespace-highlight-region start to)))
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297 ))))))
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298
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299
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300 (defun whitespace-highlight-window ()
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301 "Highlights the whitespaces in the current window."
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302 (whitespace-incremental-highlight (save-excursion
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303 (forward-line (- (window-height)))
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304 (point))
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305 (save-excursion
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306 (forward-line (window-height))
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307 (point))))
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308
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309 (defun whitespace-dehighlight-region (start end)
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310 "Dehighlights the whitespaces in the region from START to END."
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311 (map-extents '(lambda (extent dummy)
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312 (if (or (eq (extent-face extent) 'whitespace-blank-face)
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313 (eq (extent-face extent) 'whitespace-tab-face)
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314 (extent-property extent
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315 'whitespace-highlighted-region))
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316 (progn
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317 (delete-extent extent)
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318 nil)))
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319 nil
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320 start
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321 end
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322 )
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323 )
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324
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325 (defun whitespace-dehighlight-buffer ()
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326 "Dehighlights the whitespaces in the current buffer."
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327 (whitespace-dehighlight-region (point-min) (point-max))
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328 )
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329
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330 (defun whitespace-highlight-after-change-function (beg end old-len)
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331 "Called, when any modification is made to buffer text. Highlights
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332 the whitespaces (blanks and tabs) in the region from BEG to
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333 END. OLD-LEN isn't used, but provided from the after-change hook."
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334 (if (or (eq beg end)
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335 (null whitespace-mode))
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336 nil
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337 (whitespace-dehighlight-region beg end)
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338 (whitespace-highlight-region beg end)))
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339
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340 (defvar whitespace-mode nil
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341 "Non-nil, if the `whitespace-mode' is active.")
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342
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343 (make-variable-buffer-local 'whitespace-mode)
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344
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345 (defun whitespace-mode (&optional arg)
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346 "Toggle whitespace mode.
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347 With arg, turn whitespace mode on iff arg is positive.
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348 In whitespace mode the different whitespaces (tab and blank)
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349 are highlighted with different faces. The faces are:
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350 `whitespace-blank-face' and `whitespace-tab-face'.
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351 Use the command `whitespace-show-faces' to show their values."
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352 (interactive "P")
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353 (setq whitespace-mode
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354 (if (null arg) (not whitespace-mode)
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355 (> (prefix-numeric-value arg) 0)))
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356 (if (and whitespace-mode whitespace-incremental-mode)
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357 (progn
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358 (whitespace-incremental-highlight (point-min) (point-max))
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359 (setq whitespace-incremental-mode nil)
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360 (remove-hook 'post-command-hook 'whitespace-highlight-window)
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361 (run-hooks 'whitespace-mode-hook)
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362 )
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363 (setq whitespace-incremental-mode nil)
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364 (remove-hook 'post-command-hook 'whitespace-highlight-window)
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365 (redraw-modeline) ;(force-mode-line-update)
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366 (if whitespace-mode
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367 (progn
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368 (whitespace-highlight-buffer)
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369 (make-local-variable 'after-change-functions)
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370 (add-hook 'after-change-functions
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371 'whitespace-highlight-after-change-function)
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372 (run-hooks 'whitespace-mode-hook))
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373 (whitespace-dehighlight-buffer)
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374 (remove-hook 'after-change-functions
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375 'whitespace-highlight-after-change-function)
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376 (remove-hook 'post-command-hook 'whitespace-highlight-window)
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377 )))
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378
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379 (defvar whitespace-incremental-mode nil
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380 "Non-nil, if the `whitespace-incremental-mode' is active.")
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381
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382 (make-variable-buffer-local 'whitespace-incremental-mode)
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383
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384 (defun whitespace-incremental-mode (&optional arg)
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385 "Toggle whitespace incremental mode.
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386 With arg, turn whitespace incremental mode on iff arg is positive.
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387 In whitespace incremental mode the different whitespaces (tab and blank)
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388 are highlighted with different faces. The faces are:
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389 `whitespace-blank-face' and `whitespace-tab-face'.
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390 Use the command `whitespace-show-faces' to show their values.
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391 In this mode only these tabs and blanks are highlighted, which are in
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392 the region from (point) - (window-heigh) to (point) + (window-heigh)."
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393 (interactive "P")
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394 (setq whitespace-incremental-mode
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395 (if (null arg) (not whitespace-incremental-mode)
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396 (> (prefix-numeric-value arg) 0)))
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397 (if (and whitespace-mode whitespace-incremental-mode)
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398 (set-extent-property (make-extent (point-min) (point-max))
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399 'whitespace-highlighted-region
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400 t))
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401 (setq whitespace-mode nil)
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402 (redraw-modeline) ;(force-mode-line-update)
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403 ;(set-buffer-modified-p (buffer-modified-p)) ;No-op, but updates mode line.
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404 (if whitespace-incremental-mode
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405 (progn
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406 (whitespace-highlight-window)
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407 (make-local-variable 'post-command-hook)
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408 (add-hook 'post-command-hook 'whitespace-highlight-window)
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409 (make-local-variable 'after-change-functions)
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410 (add-hook 'after-change-functions
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411 'whitespace-highlight-after-change-function)
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412 (run-hooks 'whitespace-incremental-mode-hook))
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413 (whitespace-dehighlight-buffer)
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414 (remove-hook 'after-change-functions
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415 'whitespace-highlight-after-change-function)
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416 (remove-hook 'post-command-hook 'whitespace-highlight-window)
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417 ))
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418
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419
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420 ;;; Add whitespace-mode and whitespace-incremental-mode to the minor-mode-alist
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421
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422 (or (assq 'whitespace-mode minor-mode-alist)
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423 (setq minor-mode-alist
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424 (cons '(whitespace-mode " WSP") minor-mode-alist)))
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425
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426 (or (assq 'whitespace-incremental-mode minor-mode-alist)
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427 (setq minor-mode-alist
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428 (cons '(whitespace-incremental-mode " WSPI") minor-mode-alist)))
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429
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430
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431 ;;; Menu for the whitespace mode
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432
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433 (defun whitespace-set-whitespace-chars (new-whitespace-chars)
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434 "Sets the variable `whitespace-chars' and activates the change."
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435 (interactive (list (read (completing-read "Whitespaces to highlight: "
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436 '(("tabs-and-blanks")
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437 ("tabs")
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438 ("blanks"))
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439 nil
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440 t
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441 (symbol-name 'whitespace-chars)))))
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442 (if (eq whitespace-chars new-whitespace-chars)
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443 nil ; nothing to do
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444 (setq whitespace-chars new-whitespace-chars)
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445 (setq-default whitespace-chars new-whitespace-chars)
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446 (cond (whitespace-mode (whitespace-mode)
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447 (whitespace-mode))
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448 (whitespace-incremental-mode (whitespace-incremental-mode)
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449 (whitespace-incremental-mode))
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450 )))
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451
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452 (defvar whitespace-menu nil
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453 "A menu for the whitespace minor mode.")
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454
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455 (setq whitespace-menu
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456 '("Whitespace Menu"
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457 ["Highlight Whitespaces"
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458 whitespace-mode
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459 :style toggle
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460 :selected whitespace-mode]
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461 ["Incremental Highlighting"
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462 whitespace-incremental-mode
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463 :style toggle
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464 :selected whitespace-incremental-mode
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465 ]
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466 "---"
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467 ["Show Whitespace Faces" whitespace-show-faces t]
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468 "---"
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469 ["Highlight Tabs & Blanks"
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470 (whitespace-set-whitespace-chars 'tabs-and-blanks)
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471 :style radio
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472 :selected (eq whitespace-chars 'tabs-and-blanks)]
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473 ["Highlight Only Tabs"
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474 (whitespace-set-whitespace-chars 'tabs)
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475 :style radio
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476 :selected (eq whitespace-chars 'tabs)]
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477 ["Highlight Only Blanks"
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478 (whitespace-set-whitespace-chars 'blanks)
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479 :style radio
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480 :selected (eq whitespace-chars 'blanks)]
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481 ))
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482
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483 (if (and (boundp 'whitespace-install-submenu) whitespace-install-submenu)
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484 (add-submenu '("Apps") whitespace-menu))
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485
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486 ;;; Toolbar icon for the XEmacs
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487
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488 (if (featurep 'toolbar)
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489
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490 (defvar toolbar-wspace-icon
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491 (toolbar-make-button-list
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492 "/* XPM */
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493 static char * whitespace[] = {
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494 \"28 28 4 1\",
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495 \" c Gray75 s backgroundToolBarColor\",
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496 \". c black\",
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497 \"X c Gray60\",
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498 \"o c white\",
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499 \" \",
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500 \" \",
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501 \" \",
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502 \" \",
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503 \" .. . \",
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504 \" XXX.XXXXXX . \",
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505 \" Xoo.oooooXX . \",
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506 \" .. .. ..o.o..oo..X... .. \",
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507 \" . . X.o..o.ooX. X. . . \",
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508 \" . . .oo.oo.ooX.XX. .... \",
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509 \" ... .oo.oo.ooo.oo. . \",
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510 \" . .Xoo.oo.ooo.oo. . . \",
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511 \" . .Xo...o..o...o.. .. \",
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512 \" XooooooooooooX \",
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513 \" XooooooooooooX \",
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514 \" .... ....ooo...ooo... .. \",
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515 \" . . .oo.o.oo.oo.oX. . . \",
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516 \" . .oo.ooo..oo.oX .... \",
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517 \" .. .oo.o..o.oo.oX . \",
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518 \" . . .oo.o.oo.oo.oX. . . \",
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519 \" .... ...oo.....oo.. .. \",
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520 \" .ooooooooooooX \",
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521 \" .XXXXXXXXXXXXX \",
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522 \" . \",
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523 \" ... \",
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524 \" \",
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525 \" \",
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526 \" \"
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527 };")
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528 "A whitespace icon.")
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529 )
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530
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531 (defun whitespace-toolbar-function ()
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532 "Calls the function determined by `whitespace-toolbar-function'."
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533 (interactive)
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534 (call-interactively whitespace-toolbar-function))
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535
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536 (if (and (adapt-xemacsp)
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537 whitespace-install-toolbar-icon
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538 (featurep 'toolbar)
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539 (eq (device-type (selected-device)) 'x))
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540 (add-spec-list-to-specifier
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541 default-toolbar
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542 '((global
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543 (nil
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544 [toolbar-file-icon find-file t "Open a file" ]
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545 [toolbar-folder-icon dired t "View directory"]
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546 [toolbar-disk-icon save-buffer t "Save buffer" ]
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547 [toolbar-printer-icon print-buffer t "Print buffer" ]
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548 [toolbar-cut-icon x-kill-primary-selection t "Kill region"]
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549 [toolbar-copy-icon x-copy-primary-selection t "Copy region"]
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550 [toolbar-paste-icon
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551 x-yank-clipboard-selection t "Paste from clipboard"]
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552 [toolbar-undo-icon undo t "Undo edit" ]
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553 [toolbar-replace-icon query-replace t "Replace text" ]
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554 [toolbar-wspace-icon
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555 whitespace-toolbar-function t "Toggle whitespace mode"]
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556 nil
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557 [toolbar-compile-icon toolbar-compile t "Compile" ]
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558 [toolbar-debug-icon toolbar-debug t "Debug" ]
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559 [toolbar-spell-icon toolbar-ispell t "Spellcheck" ]
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560 [toolbar-mail-icon toolbar-mail t "Mail" ]
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561 [toolbar-news-icon toolbar-news t "News" ]
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562 [toolbar-info-icon toolbar-info t "Information" ]
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563 )))))
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564
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565 ;;; whitespace-mode.el ends here
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