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1 ;;; modeline.el --- modeline hackery.
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2
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3 ;; Copyright (C) 1988, 1992, 1993, 1994 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995, 1996 Ben Wing.
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5
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6 ;; This file is part of XEmacs.
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7
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8 ;; XEmacs is free software; you can redistribute it and/or modify it
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9 ;; under the terms of the GNU General Public License as published by
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10 ;; the Free Software Foundation; either version 2, or (at your option)
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11 ;; any later version.
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12
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13 ;; XEmacs is distributed in the hope that it will be useful, but
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14 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 ;; General Public License for more details.
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17
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18 ;; You should have received a copy of the GNU General Public License
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16
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19 ;; along with XEmacs; see the file COPYING. If not, write to the
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70
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20 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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21 ;; Boston, MA 02111-1307, 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 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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26 ;;; General mouse modeline stuff ;;;
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27 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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28
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29 (defvar drag-modeline-event-lag 150
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30 "*The amount of time to wait (in msecs) between drag modeline events
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31 before updating the display. If this value is too small, dragging will
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32 be choppy because redisplay cannot keep up. If it is too large, dragging
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33 will be choppy because of the explicit redisplay delay specified.")
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34
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35 (defvar modeline-click-swaps-buffers nil
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36 "*If non-nil, clicking on the modeline changes the current buffer.
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37 Click on the left half of the modeline cycles forward through the
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38 buffer list and clicking on the right half cycles backward.")
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39
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40 (defun mouse-drag-modeline (event)
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41 "Resize the window by dragging the modeline.
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42 This should be bound to a mouse button in `modeline-map'."
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43 (interactive "e")
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44 (or (button-press-event-p event)
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45 (error "%s must be invoked by a mouse-press" this-command))
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46 (or (event-over-modeline-p event)
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47 (error "not over a modeline"))
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48 (let ((depress-line (event-y event))
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49 (mouse-down t)
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50 (window (event-window event))
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51 (old-window (selected-window))
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52 (def-line-height (face-height 'default))
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53 (prior-drag-modeline-event-time 0)
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54 delta)
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55 (while mouse-down
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56 (setq event (next-event event))
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57 (cond ((motion-event-p event)
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58 (if (window-lowest-p window)
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59 (error "can't drag bottommost modeline"))
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60 (cond ((> (- (event-timestamp event)
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61 prior-drag-modeline-event-time)
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62 drag-modeline-event-lag)
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63
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64 (setq prior-drag-modeline-event-time (event-timestamp event))
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65
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66 (if (event-over-modeline-p event)
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67 (setq delta 0)
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68 (setq delta (- (event-y-pixel event)
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69 (nth 3 (window-pixel-edges window))))
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70 (if (> delta 0)
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71 (setq delta (+ delta def-line-height)))
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72 (setq delta (/ delta def-line-height)))
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73
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74 ;; cough sputter hack kludge. It shouldn't be possible
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75 ;; to get in here when we are over the minibuffer. But
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76 ;; it is happening and that cause next-vertical-window to
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77 ;; return nil which does not lead to window-height returning
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78 ;; anything remotely resembling a sensible value. So catch
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79 ;; the situation and die a happy death.
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80 ;;
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81 ;; Oh, and the BLAT FOOP error messages suck as well but
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82 ;; I don't know what should be there. This should be
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83 ;; looked at again when the new redisplay is done.
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84 (if (not (next-vertical-window window))
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85 (error "Try again: dragging in minibuffer does nothing"))
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86 (cond ((and (> delta 0)
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87 (<= (- (window-height (next-vertical-window window))
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88 delta)
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89 window-min-height))
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90 (setq delta (- (window-height
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91 (next-vertical-window window))
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92 window-min-height))
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93 (if (< delta 0) (error "BLAT")))
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94 ((and (< delta 0)
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95 (< (+ (window-height window) delta)
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96 window-min-height))
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97 (setq delta (- window-min-height
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98 (window-height window)))
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99 (if (> delta 0) (error "FOOP"))))
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100 (if (= delta 0)
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101 nil
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102 (select-window window)
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103 (enlarge-window delta)
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104 ;; The call to enlarge-window may have caused the old
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105 ;; window to disappear. Don't try and select it in
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106 ;; that case.
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107 (if (window-live-p old-window)
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108 (select-window old-window))
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109 (sit-for 0)
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110 ))))
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111 ((button-release-event-p event)
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112 (setq mouse-down nil)
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113 (if modeline-click-swaps-buffers
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114 (mouse-release-modeline event depress-line)))
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115 ((or (button-press-event-p event)
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116 (key-press-event-p event))
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117 (error ""))
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118 (t
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119 (dispatch-event event)))
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120 )))
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121
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122 ;; from Bob Weiner (bob_weiner@pts.mot.com)
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123 (defun mouse-release-modeline (event line-num)
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124 "Handle modeline click EVENT on LINE-NUM by switching buffers.
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125 If click on left half of a frame's modeline, bury current buffer.
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126 If click on right half of a frame's modeline, raise bottommost buffer.
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127 Args are: EVENT, the mouse release event, and LINE-NUM, the line number
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128 within the frame at which the mouse was first depressed."
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129 (if (= line-num (event-y event))
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130 ;; Button press and release are at same line, treat this as
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131 ;; a click and switch buffers.
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132 (if (< (event-x event) (/ (window-width (event-window event)) 2))
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133 ;; On left half of modeline, bury current buffer,
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134 ;; displaying second buffer on list.
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135 (mouse-bury-buffer event)
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136 ;; On right half of modeline, raise and display bottommost
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137 ;; buffer in buffer list.
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138 (mouse-unbury-buffer event))))
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139
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140 (defconst modeline-menu
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141 '("Window Commands"
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142 ["Delete Window Above" delete-window t]
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143 ["Delete Other Windows" delete-other-windows t]
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144 ["Split Window Above" split-window-vertically t]
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145 ["Split Window Horizontally" split-window-horizontally t]
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146 ["Balance Windows" balance-windows t]
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147 ))
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148
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149 (defun modeline-menu (event)
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150 (interactive "e")
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151 (popup-menu-and-execute-in-window
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152 (cons (format "Window Commands for %S:"
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153 (buffer-name (event-buffer event)))
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154 (cdr modeline-menu))
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155 event))
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156
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157 (defvar modeline-map (make-sparse-keymap 'modeline-map)
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158 "Keymap consulted for mouse-clicks on the modeline of a window.
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159 This variable may be buffer-local; its value will be looked up in
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160 the buffer of the window whose modeline was clicked upon.")
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161
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162 (define-key modeline-map 'button1 'mouse-drag-modeline)
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163 ;; button2 selects the window without setting point
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164 (define-key modeline-map 'button2 (lambda () (interactive "@")))
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165 (define-key modeline-map 'button3 'modeline-menu)
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166
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167 (make-face 'modeline-mousable "Face for mousable portions of the modeline.")
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168
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169 (defmacro make-modeline-command-wrapper (command)
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170 `#'(lambda (event)
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171 (interactive "e")
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172 (save-selected-window
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173 (select-window (event-window event))
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174 (call-interactively ',(eval command)))))
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175
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176 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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177 ;;; Minor modes ;;;
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178 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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179
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180 (defvar minor-mode-alist nil
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181 "Alist saying how to show minor modes in the modeline.
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182 Each element looks like (VARIABLE STRING);
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183 STRING is included in the modeline iff VARIABLE's value is non-nil.
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184
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185 Actually, STRING need not be a string; any possible modeline element
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186 is okay. See `modeline-format'.")
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187
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188 ;; Used by C code (lookup-key and friends) but defined here.
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189 (defvar minor-mode-map-alist nil
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190 "Alist of keymaps to use for minor modes.
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191 Each element looks like (VARIABLE . KEYMAP); KEYMAP is used to read
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192 key sequences and look up bindings iff VARIABLE's value is non-nil.
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193 If two active keymaps bind the same key, the keymap appearing earlier
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194 in the list takes precedence.")
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195
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196 (make-face 'modeline-mousable-minor-mode
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197 "Face for mousable minor-mode strings in the modeline.")
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198
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199 (defvar modeline-mousable-minor-mode-extent (make-extent nil nil)
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200 ;; alliteration at its finest.
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201 "Extent managing the mousable minor mode modeline strings.")
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202 (set-extent-face modeline-mousable-minor-mode-extent
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203 'modeline-mousable-minor-mode)
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204
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205 ;; This replaces the idiom
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206 ;;
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207 ;; (or (assq 'isearch-mode minor-mode-alist)
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208 ;; (setq minor-mode-alist
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209 ;; (purecopy
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210 ;; (append minor-mode-alist
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211 ;; '((isearch-mode isearch-mode))))))
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212
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213 (defun add-minor-mode (toggle name &optional keymap after toggle-fun)
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214 "Add a minor mode to `minor-mode-alist' and `minor-mode-map-alist'.
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215 TOGGLE is a symbol whose value as a variable specifies whether the
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216 minor mode is active. NAME is the name that should appear in the
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217 modeline (it should be a string beginning with a space). KEYMAP is a
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218 keymap to make active when the minor mode is active. AFTER is the
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219 toggling symbol used for another minor mode. If AFTER is non-nil,
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220 then it is used to position the new mode in the minor-mode alists.
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221 TOGGLE-FUN specifies an interactive function that is called to toggle
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222 the mode on and off; this affects what happens when button2 is pressed
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223 on the mode, and when button3 is pressed somewhere in the list of
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224 modes. If TOGGLE-FUN is nil and TOGGLE names an interactive function,
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225 TOGGLE is used as the toggle function.
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226
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227 Example: (add-minor-mode 'view-minor-mode \" View\" view-mode-map)"
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228 (let (el place
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229 (add-elt #'(lambda (elt sym)
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230 (cond ((null after) ; add to front
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231 (set sym (cons elt (symbol-value sym))))
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232 ((and (not (eq after t))
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233 (setq place (memq (assq after
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234 (symbol-value sym))
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235 (symbol-value sym))))
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236 (setq elt (cons elt (cdr place)))
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237 (setcdr place elt))
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238 (t
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239 (set sym (append (symbol-value sym) (list elt))))
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240 )
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241 (symbol-value sym)))
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242 toggle-keymap)
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243 (if toggle-fun
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244 (if (not (commandp toggle-fun))
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245 (error "not an interactive function: %S" toggle-fun))
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246 (if (commandp toggle)
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247 (setq toggle-fun toggle)))
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248 (if (and toggle-fun name)
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249 (progn
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250 (setq toggle-keymap (make-sparse-keymap
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251 (intern (concat "modeline-minor-"
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252 (symbol-name toggle)
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253 "-map"))))
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254 (define-key toggle-keymap 'button2
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255 ;; defeat the DUMB-ASS byte-compiler, which tries to
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256 ;; expand the macro at compile time and fucks up.
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257 (eval '(make-modeline-command-wrapper toggle-fun)))
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258 (put toggle 'modeline-toggle-function toggle-fun)))
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259 (and name
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260 (let ((hacked-name
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261 (if toggle-keymap
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262 (cons (let ((extent (make-extent nil nil)))
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263 (set-extent-keymap extent toggle-keymap)
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264 (set-extent-property
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265 extent 'help-echo
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266 (concat "button2 turns off "
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267 (if (symbolp toggle-fun)
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268 (symbol-name toggle-fun)
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269 (symbol-name toggle))))
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270 extent)
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271 (cons
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272 modeline-mousable-minor-mode-extent
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273 name))
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274 name)))
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275 (if (setq el (assq toggle minor-mode-alist))
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276 (setcdr el (list hacked-name))
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277 (funcall add-elt
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278 (list toggle hacked-name)
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279 'minor-mode-alist))))
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280 (and keymap
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281 (if (setq el (assq toggle minor-mode-map-alist))
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282 (setcdr el keymap)
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283 (funcall add-elt
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284 (cons toggle keymap)
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285 'minor-mode-map-alist)))
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286 ))
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287
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288 (add-minor-mode 'abbrev-mode " Abbrev")
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289 (add-minor-mode 'overwrite-mode 'overwrite-mode)
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290 (add-minor-mode 'auto-fill-function " Fill" nil nil 'auto-fill-mode)
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291 ;; not really a minor mode...
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292 (add-minor-mode 'defining-kbd-macro " Def")
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293
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294 (defun modeline-minor-mode-menu (event)
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295 (interactive "e")
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296 (popup-menu-and-execute-in-window
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297 (cons (format "Minor Mode Commands for %S:"
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298 (buffer-name (event-buffer event)))
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299 (apply 'nconc
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300 (mapcar
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301 #'(lambda (x)
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302 (let* ((toggle-sym (car x))
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303 (toggle-fun
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304 (or (get toggle-sym
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305 'modeline-toggle-function)
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306 (and (fboundp toggle-sym)
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307 (commandp toggle-sym)
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308 toggle-sym))))
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309 (if (not toggle-fun) nil
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310 (list (vector
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311 (concat (if (and (boundp toggle-sym)
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312 (symbol-value toggle-sym))
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313 "turn off " "turn on ")
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314 (if (symbolp toggle-fun)
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315 (symbol-name toggle-fun)
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316 (symbol-name toggle-sym)))
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317
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318 toggle-fun
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319 t)))))
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320 minor-mode-alist)))
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321 event))
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0
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322
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323 (defvar modeline-minor-mode-map (make-sparse-keymap 'modeline-minor-mode-map)
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324 "Keymap consulted for mouse-clicks on the minor-mode modeline list.")
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325 (define-key modeline-minor-mode-map 'button3 'modeline-minor-mode-menu)
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326
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327 (defvar modeline-minor-mode-extent (make-extent nil nil)
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328 "Extent covering the minor mode modeline strings.")
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329 (set-extent-face modeline-minor-mode-extent 'modeline-mousable)
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330 (set-extent-keymap modeline-minor-mode-extent modeline-minor-mode-map)
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331
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332
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333 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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334 ;;; Other ;;;
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335 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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336
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337 (defun modeline-buffers-menu (event)
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338 (interactive "e")
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339 (popup-menu-and-execute-in-window
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340 '("Buffers Popup Menu"
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341 :filter buffers-menu-filter
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342 ["List All Buffers" list-buffers t]
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343 "--"
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344 )
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345 event))
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346
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347 (defvar modeline-buffer-id-left-map
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348 (make-sparse-keymap 'modeline-buffer-id-left-map)
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349 "Keymap consulted for mouse-clicks on the left half of the buffer-id string.")
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350
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351 (defvar modeline-buffer-id-right-map
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352 (make-sparse-keymap 'modeline-buffer-id-right-map)
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353 "Keymap consulted for mouse-clicks on the right half of the buffer-id string.")
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354
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355 (define-key modeline-buffer-id-left-map 'button2 'mouse-unbury-buffer)
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356 (define-key modeline-buffer-id-right-map 'button2 'mouse-bury-buffer)
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357 (define-key modeline-buffer-id-left-map 'button3 'modeline-buffers-menu)
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358 (define-key modeline-buffer-id-right-map 'button3 'modeline-buffers-menu)
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359
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360 (make-face 'modeline-buffer-id
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361 "Face for the buffer ID string in the modeline.")
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362
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363 (defvar modeline-buffer-id-extent (make-extent nil nil)
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364 "Extent covering the whole of the buffer-id string.")
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365 (set-extent-face modeline-buffer-id-extent 'modeline-buffer-id)
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366
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367 (defvar modeline-buffer-id-left-extent (make-extent nil nil)
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368 "Extent covering the left half of the buffer-id string.")
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369 (set-extent-keymap modeline-buffer-id-left-extent
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370 modeline-buffer-id-left-map)
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371 (set-extent-property modeline-buffer-id-left-extent 'help-echo
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372 "button2 cycles to the previous buffer")
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373
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374 (defvar modeline-buffer-id-right-extent (make-extent nil nil)
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375 "Extent covering the right half of the buffer-id string.")
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376 (set-extent-keymap modeline-buffer-id-right-extent
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377 modeline-buffer-id-right-map)
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378 (set-extent-property modeline-buffer-id-right-extent 'help-echo
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379 "button2 cycles to the next buffer")
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380
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381 (defconst modeline-buffer-identification
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382 (list (cons modeline-buffer-id-left-extent (purecopy "XEmacs:"))
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383 (cons modeline-buffer-id-right-extent (purecopy " %17b")))
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384 "Modeline control for identifying the buffer being displayed.
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385 Its default value is \"XEmacs: %17b\" (NOT!). Major modes that edit things
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386 other than ordinary files may change this (e.g. Info, Dired,...)")
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387 (make-variable-buffer-local 'modeline-buffer-identification)
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388
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389 (defconst modeline-process nil
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390 "Modeline control for displaying info on process status.
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391 Normally nil in most modes, since there is no process to display.")
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392 (make-variable-buffer-local 'modeline-process)
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393
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394 (defvar modeline-modified-map (make-sparse-keymap 'modeline-modified-map)
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395 "Keymap consulted for mouse-clicks on the modeline-modified string.")
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396 (define-key modeline-modified-map 'button2
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98
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397 (make-modeline-command-wrapper 'vc-toggle-read-only))
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0
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398
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399 (defvar modeline-modified-extent (make-extent nil nil)
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400 "Extent covering the modeline-modified string.")
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401 (set-extent-face modeline-modified-extent 'modeline-mousable)
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402 (set-extent-keymap modeline-modified-extent modeline-modified-map)
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403 (set-extent-property modeline-modified-extent 'help-echo
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404 "button2 toggles the buffer's read-only status")
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405
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406 (defconst modeline-modified (purecopy '("--%1*%1+-"))
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407 "Modeline control for displaying whether current buffer is modified.")
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408 (make-variable-buffer-local 'modeline-modified)
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409
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410 (defvar modeline-narrowed-map (make-sparse-keymap 'modeline-narrowed-map)
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411 "Keymap consulted for mouse-clicks on the modeline-narrowed string.")
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412 (define-key modeline-narrowed-map 'button2
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413 (make-modeline-command-wrapper 'widen))
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414
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415 (defvar modeline-narrowed-extent (make-extent nil nil)
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416 "Extent covering the modeline-narrowed string.")
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417 (set-extent-face modeline-narrowed-extent 'modeline-mousable)
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418 (set-extent-keymap modeline-narrowed-extent modeline-narrowed-map)
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419 (set-extent-property modeline-narrowed-extent 'help-echo
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420 "button2 widens the buffer")
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421
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70
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422 (setq-default
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423 modeline-format
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424 (list
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425 (purecopy "")
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426 (cons modeline-modified-extent 'modeline-modified)
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427 (cons modeline-buffer-id-extent 'modeline-buffer-identification)
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428 (purecopy " ")
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429 'global-mode-string
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430 (purecopy " %[(")
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431 (cons modeline-minor-mode-extent (list "" 'mode-name 'minor-mode-alist))
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432 (cons modeline-narrowed-extent "%n")
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433 'modeline-process
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434 (purecopy ")%]----")
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435 (purecopy '(line-number-mode "L%l--"))
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436 (purecopy '(column-number-mode "C%c--"))
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437 (purecopy '(-3 . "%p"))
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438 (purecopy "-%-")))
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