annotate lisp/cmdloop.el @ 442:abe6d1db359e r21-2-36

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1 ;;; cmdloop.el --- support functions for the top-level command loop.
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2
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3 ;; Copyright (C) 1992-4, 1997 Free Software Foundation, Inc.
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4
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5 ;; Author: Richard Mlynarik
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6 ;; Date: 8-Jul-92
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7 ;; Maintainer: XEmacs Development Team
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8 ;; Keywords: internal, dumped
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Synched up with: FSF 19.30. (Some of the stuff below is in FSF's subr.el.)
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28
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29 ;;; Commentary:
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30
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31 ;; This file is dumped with XEmacs.
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32
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33 ;;; Code:
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34
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35 (defun recursion-depth ()
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36 "Return the current depth in recursive edits."
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37 (+ command-loop-level (minibuffer-depth)))
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38
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39 (defun top-level ()
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40 "Exit all recursive editing levels."
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41 (interactive)
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42 (throw 'top-level nil))
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43
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44 (defun exit-recursive-edit ()
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45 "Exit from the innermost recursive edit or minibuffer."
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46 (interactive)
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47 (if (> (recursion-depth) 0)
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48 (throw 'exit nil))
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49 (error "No recursive edit is in progress"))
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50
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51 (defun abort-recursive-edit ()
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52 "Abort the command that requested this recursive edit or minibuffer input."
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53 (interactive)
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54 (if (> (recursion-depth) 0)
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55 (throw 'exit t))
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56 (error "No recursive edit is in progress"))
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57
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58 ;; (defun keyboard-quit ()
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59 ;; "Signal a `quit' condition."
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60 ;; (interactive)
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61 ;; (deactivate-mark)
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62 ;; (signal 'quit nil))
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63
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64 ;; moved here from pending-del.
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65 (defun keyboard-quit ()
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66 "Signal a `quit' condition.
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67 If this character is typed while lisp code is executing, it will be treated
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68 as an interrupt.
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69 If this character is typed at top-level, this simply beeps.
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70 If `zmacs-regions' is true, and the zmacs region is active in this buffer,
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71 then this key deactivates the region without beeping or signalling."
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72 (interactive)
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73 (if (and (region-active-p)
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74 (eq (current-buffer) (zmacs-region-buffer)))
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75 ;; pseudo-zmacs compatibility: don't beep if this ^G is simply
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76 ;; deactivating the region. If it is inactive, beep.
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77 nil
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78 (signal 'quit nil)))
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79
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80 (defvar buffer-quit-function nil
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81 "Function to call to \"quit\" the current buffer, or nil if none.
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82 \\[keyboard-escape-quit] calls this function when its more local actions
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83 \(such as cancelling a prefix argument, minibuffer or region) do not apply.")
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84
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85 (defun keyboard-escape-quit ()
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86 "Exit the current \"mode\" (in a generalized sense of the word).
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87 This command can exit an interactive command such as `query-replace',
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88 can clear out a prefix argument or a region,
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89 can get out of the minibuffer or other recursive edit,
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90 cancel the use of the current buffer (for special-purpose buffers),
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91 or go back to just one window (by deleting all but the selected window)."
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92 (interactive)
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93 (cond ((eq last-command 'mode-exited) nil)
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94 ((> (minibuffer-depth) 0)
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95 (abort-recursive-edit))
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96 (current-prefix-arg
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97 nil)
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98 ((region-active-p)
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99 (zmacs-deactivate-region))
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100 ((> (recursion-depth) 0)
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101 (exit-recursive-edit))
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102 (buffer-quit-function
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103 (funcall buffer-quit-function))
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104 ((not (one-window-p t))
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105 (delete-other-windows))
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106 ((string-match "^ \\*" (buffer-name (current-buffer)))
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107 (bury-buffer))))
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108
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109 ;; `cancel-mode-internal' is a function of a misc-user event, which is
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110 ;; queued when window system directs XEmacs frame to cancel any modal
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111 ;; behavior it exposes, like mouse pointer grabbing.
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112 ;;
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113 ;; This function does nothing at the top level, but the code which
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114 ;; runs modal event loops, such as selection drag loop in `mouse-track',
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115 ;; check if misc-user function symbol is `cancel-mode-internal', and
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116 ;; takes necessary cleanup actions.
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117 (defun cancel-mode-internal (object)
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118 (setq zmacs-region-stays t))
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119
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120 ;; Someone wrote: "This should really be a ring of last errors."
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121 ;;
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122 ;; But why bother? This stuff is not all that necessary now that we
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123 ;; have message log, anyway.
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124 (defvar last-error nil
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125 "Object describing the last signaled error.")
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126
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127 (defcustom errors-deactivate-region nil
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128 "*Non-nil means that errors will cause the region to be deactivated."
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129 :type 'boolean
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130 :group 'editing-basics)
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131
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132 (defun command-error (error-object)
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133 (let* ((old-debug-on-error debug-on-error)
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134 (inhibit-quit t)
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135 (debug-on-error nil)
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136 (etype (car-safe error-object)))
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137 (setq quit-flag nil)
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138 (setq standard-output t)
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139 (setq standard-input t)
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140 (setq executing-kbd-macro nil)
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141 (and errors-deactivate-region
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142 (zmacs-deactivate-region))
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143 (discard-input)
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144
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145 (setq last-error error-object)
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146
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147 (message nil)
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148 (ding nil (cond ((eq etype 'undefined-keystroke-sequence)
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149 (if (and (vectorp (nth 1 error-object))
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150 (/= 0 (length (nth 1 error-object)))
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151 (button-event-p (aref (nth 1 error-object) 0)))
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152 'undefined-click
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153 'undefined-key))
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154 ((eq etype 'quit)
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155 'quit)
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156 ((memq etype '(end-of-buffer beginning-of-buffer))
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157 'buffer-bound)
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158 ((eq etype 'buffer-read-only)
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159 'read-only)
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160 (t 'command-error)))
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161 (display-error error-object t)
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162
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163 (if (noninteractive)
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164 (progn
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165 (if old-debug-on-error
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166 (progn
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167 (message "Backtrace:\n\n")
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168 (backtrace)
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169 (message "\n")))
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170 (message "%s exiting\n." emacs-program-name)
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171 (kill-emacs -1)))
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172 t))
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173
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174 (defun describe-last-error ()
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175 "Redisplay the last error-message. See the variable `last-error'."
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176 (interactive)
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177 (if last-error
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178 (with-displaying-help-buffer
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179 (lambda ()
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180 (princ "Last error was:\n" standard-output)
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181 (display-error last-error standard-output)))
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182 (message "No error yet")))
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183
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184
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185 ;;#### Must be done later in the loadup sequence
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186 ;(define-key (symbol-function 'help-command) "e" 'describe-last-error)
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187
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188
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189 (defun truncate-command-history-for-gc ()
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190 (let ((tail (nthcdr 30 command-history)))
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191 (if tail (setcdr tail nil)))
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192 (let ((tail (nthcdr 30 values)))
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193 (if tail (setcdr tail nil)))
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194 )
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195
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196 (add-hook 'pre-gc-hook 'truncate-command-history-for-gc)
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197
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198
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199 ;;;; Object-oriented programming at its finest
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200
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201 ;; Now in src/print.c; used by Ferror_message_string and others
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202 ;(defun display-error (error-object stream) ;(defgeneric report-condition ...)
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203 ; "Display `error-object' on `stream' in a user-friendly way."
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204 ; (funcall (or (let ((type (car-safe error-object)))
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205 ; (catch 'error
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206 ; (and (consp error-object)
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207 ; (symbolp type)
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208 ; ;;(stringp (get type 'error-message))
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209 ; (consp (get type 'error-conditions))
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210 ; (let ((tail (cdr error-object)))
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211 ; (while (not (null tail))
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212 ; (if (consp tail)
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213 ; (setq tail (cdr tail))
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214 ; (throw 'error nil)))
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215 ; t)
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216 ; ;; (check-type condition condition)
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217 ; (get type 'error-conditions)
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218 ; ;; Search class hierarchy
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219 ; (let ((tail (get type 'error-conditions)))
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220 ; (while (not (null tail))
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221 ; (cond ((not (and (consp tail)
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222 ; (symbolp (car tail))))
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223 ; (throw 'error nil))
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224 ; ((get (car tail) 'display-error)
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225 ; (throw 'error (get (car tail)
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226 ; 'display-error)))
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227 ; (t
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228 ; (setq tail (cdr tail)))))
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229 ; ;; Default method
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230 ; #'(lambda (error-object stream)
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231 ; (let ((type (car error-object))
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232 ; (tail (cdr error-object))
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233 ; (first t)
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234 ; (print-message-label 'error))
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235 ; (if (eq type 'error)
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236 ; (progn (princ (car tail) stream)
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237 ; (setq tail (cdr tail)))
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238 ; (princ (or (gettext (get type 'error-message)) type)
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239 ; stream))
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240 ; (while tail
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241 ; (princ (if first ": " ", ") stream)
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242 ; (prin1 (car tail) stream)
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243 ; (setq tail (cdr tail)
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244 ; first nil))))))))
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245 ; #'(lambda (error-object stream)
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246 ; (princ (gettext "Peculiar error ") stream)
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247 ; (prin1 error-object stream)))
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248 ; error-object stream))
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249
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250 (put 'file-error 'display-error
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251 #'(lambda (error-object stream)
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252 (let ((tail (cdr error-object))
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253 (first t))
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254 (princ (car tail) stream)
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255 (while (setq tail (cdr tail))
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256 (princ (if first ": " ", ") stream)
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257 (princ (car tail) stream)
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258 (setq first nil)))))
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259
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260 (put 'undefined-keystroke-sequence 'display-error
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261 #'(lambda (error-object stream)
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262 (princ (key-description (car (cdr error-object))) stream)
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263 ;; #### I18N3: doesn't localize properly.
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264 (princ (gettext " not defined.") stream) ; doo dah, doo dah.
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265 ))
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266
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267
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268 (defcustom teach-extended-commands-p t
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269 "*If true, then `\\[execute-extended-command]' will teach you keybindings.
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270 Any time you execute a command with \\[execute-extended-command] which has a
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271 shorter keybinding, you will be shown the alternate binding before the
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272 command executes. There is a short pause after displaying the binding,
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273 before executing it; the length can be controlled by
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274 `teach-extended-commands-timeout'."
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275 :type 'boolean
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276 :group 'keyboard)
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277
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278 (defcustom teach-extended-commands-timeout 4
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279 "*How long to pause after displaying a keybinding before executing.
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280 The value is measured in seconds. This only applies if
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281 `teach-extended-commands-p' is true."
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282 :type 'number
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283 :group 'keyboard)
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284
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285 ;That damn RMS went off and implemented something differently, after
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286 ;we had already implemented it. We can't support both properly until
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287 ;we have Lisp magic variables.
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288 ;(defvar suggest-key-bindings t
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289 ; "*FSFmacs equivalent of `teach-extended-commands-*'.
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290 ;Provided for compatibility only.
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291 ;Non-nil means show the equivalent key-binding when M-x command has one.
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292 ;The value can be a length of time to show the message for.
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293 ;If the value is non-nil and not a number, we wait 2 seconds.")
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294 ;
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295 ;(make-obsolete-variable 'suggest-key-bindings 'teach-extended-commands-p)
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296
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297 (defun execute-extended-command (prefix-arg)
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298 "Read a command name from the minibuffer using 'completing-read'.
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299 Then call the specified command using 'command-execute' and return its
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300 return value. If the command asks for a prefix argument, supply the
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301 value of the current raw prefix argument, or the value of PREFIX-ARG
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302 when called from Lisp."
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303 (interactive "P")
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304 ;; Note: This doesn't hack "this-command-keys"
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305 (let ((prefix-arg prefix-arg))
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306 (setq this-command (read-command
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307 ;; Note: this has the hard-wired
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308 ;; "C-u" and "M-x" string bug in common
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309 ;; with all GNU Emacs's.
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310 ;; (i.e. it prints C-u and M-x regardless of
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311 ;; whether some other keys were actually bound
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312 ;; to `execute-extended-command' and
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313 ;; `universal-argument'.
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314 (cond ((eq prefix-arg '-)
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315 "- M-x ")
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316 ((equal prefix-arg '(4))
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317 "C-u M-x ")
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318 ((integerp prefix-arg)
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319 (format "%d M-x " prefix-arg))
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320 ((and (consp prefix-arg)
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321 (integerp (car prefix-arg)))
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322 (format "%d M-x " (car prefix-arg)))
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323 (t
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324 "M-x ")))))
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325
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326 (if (and teach-extended-commands-p
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327 (interactive-p))
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328 ;; Remember the keys, run the command, and show the keys (if
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329 ;; any). The funny variable names are a poor man's guarantee
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330 ;; that we don't get tripped by this-command doing something
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331 ;; funny. Quoth our forefathers: "We want lexical scope!"
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332 (let ((_execute_command_keys_ (where-is-internal this-command))
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333 (_execute_command_name_ this-command)) ; the name can change
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334 (command-execute this-command t)
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335 (when _execute_command_keys_
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336 ;; Normally the region is adjusted in post_command_hook;
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337 ;; however, it is not called until after we finish. It
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338 ;; looks ugly for the region to get updated after the
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339 ;; delays, so we do it now. The code below is a Lispified
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340 ;; copy of code in event-stream.c:post_command_hook().
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341 (if (and (not zmacs-region-stays)
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342 (or (not (eq (selected-window) (minibuffer-window)))
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343 (eq (zmacs-region-buffer) (current-buffer))))
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344 (zmacs-deactivate-region)
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345 (zmacs-update-region))
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346 ;; Wait for a while, so the user can see a message printed,
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347 ;; if any.
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348 (when (sit-for 1)
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349 (display-message
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350 'no-log
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351 (format (if (cdr _execute_command_keys_)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
352 "Command `%s' is bound to keys: %s"
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
353 "Command `%s' is bound to key: %s")
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
354 _execute_command_name_
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
355 (sorted-key-descriptions _execute_command_keys_)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
356 (sit-for teach-extended-commands-timeout)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
357 (clear-message 'no-log))))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
358 ;; Else, just run the command.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
359 (command-execute this-command t)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
360
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
361
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
362 ;;; C code calls this; the underscores in the variable names are to avoid
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
363 ;;; cluttering the specbind namespace (lexical scope! lexical scope!)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
364 ;;; Putting this in Lisp instead of C slows kbd macros by 50%.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
365 ;(defun command-execute (_command &optional _record-flag)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
366 ; "Execute CMD as an editor command.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
367 ;CMD must be a symbol that satisfies the `commandp' predicate.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
368 ;Optional second arg RECORD-FLAG non-nil
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
369 ;means unconditionally put this command in `command-history'.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
370 ;Otherwise, that is done only if an arg is read using the minibuffer."
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
371 ; (let ((_prefix prefix-arg)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
372 ; (_cmd (indirect-function _command)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
373 ; (setq prefix-arg nil
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
374 ; this-command _command
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
375 ; current-prefix-arg _prefix
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
376 ; zmacs-region-stays nil)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
377 ; ;; #### debug_on_next_call = 0;
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
378 ; (cond ((and (symbolp _command)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
379 ; (get _command 'disabled))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
380 ; (run-hooks disabled-command-hook))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
381 ; ((or (stringp _cmd) (vectorp _cmd))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
382 ; ;; If requested, place the macro in the command history.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
383 ; ;; For other sorts of commands, call-interactively takes
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
384 ; ;; care of this.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
385 ; (if _record-flag
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
386 ; (setq command-history
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
387 ; (cons (list 'execute-kbd-macro _cmd _prefix)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
388 ; command-history)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
389 ; (execute-kbd-macro _cmd _prefix))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
390 ; (t
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
391 ; (call-interactively _command _record-flag)))))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
392
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
393 (defun y-or-n-p-minibuf (prompt)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
394 "Ask user a \"y or n\" question. Return t if answer is \"y\".
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
395 Takes one argument, which is the string to display to ask the question.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
396 It should end in a space; `y-or-n-p' adds `(y or n) ' to it.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
397 No confirmation of the answer is requested; a single character is enough.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
398 Also accepts Space to mean yes, or Delete to mean no."
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
399 (save-excursion
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
400 (let* ((pre "")
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
401 (yn (gettext "(y or n) "))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
402 ;; we need to translate the prompt ourselves because of the
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
403 ;; strange way we handle it.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
404 (prompt (gettext prompt))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
405 event)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
406 (while (stringp yn)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
407 (if (let ((cursor-in-echo-area t)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
408 (inhibit-quit t))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
409 (message "%s%s%s" pre prompt yn)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
410 (setq event (next-command-event event))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
411 (condition-case nil
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
412 (prog1
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
413 (or quit-flag (eq 'keyboard-quit (key-binding event)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
414 (setq quit-flag nil))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
415 (wrong-type-argument t)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
416 (progn
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
417 (message "%s%s%s%s" pre prompt yn (single-key-description event))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
418 (setq quit-flag nil)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
419 (signal 'quit '())))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
420 (let* ((keys (events-to-keys (vector event)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
421 (def (lookup-key query-replace-map keys)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
422 (cond ((eq def 'skip)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
423 (message "%s%sNo" prompt yn)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
424 (setq yn nil))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
425 ((eq def 'act)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
426 (message "%s%sYes" prompt yn)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
427 (setq yn t))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
428 ((eq def 'recenter)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
429 (recenter))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
430 ((or (eq def 'quit) (eq def 'exit-prefix))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
431 (signal 'quit '()))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
432 ((button-release-event-p event) ; ignore them
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
433 nil)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
434 (t
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
435 (message "%s%s%s%s" pre prompt yn
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
436 (single-key-description event))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
437 (ding nil 'y-or-n-p)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
438 (discard-input)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
439 (if (= (length pre) 0)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
440 (setq pre (gettext "Please answer y or n. ")))))))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
441 yn)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
442
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
443 (defun yes-or-no-p-minibuf (prompt)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
444 "Ask user a yes-or-no question. Return t if answer is yes.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
445 Takes one argument, which is the string to display to ask the question.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
446 It should end in a space; `yes-or-no-p' adds `(yes or no) ' to it.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
447 The user must confirm the answer with RET,
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
448 and can edit it until it has been confirmed."
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
449 (save-excursion
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
450 (let ((p (concat (gettext prompt) (gettext "(yes or no) ")))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
451 (ans ""))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
452 (while (stringp ans)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
453 (setq ans (downcase (read-string p nil t))) ;no history
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
454 (cond ((string-equal ans (gettext "yes"))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
455 (setq ans t))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
456 ((string-equal ans (gettext "no"))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
457 (setq ans nil))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
458 (t
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
459 (ding nil 'yes-or-no-p)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
460 (discard-input)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
461 (message "Please answer yes or no.")
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
462 (sleep-for 2))))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
463 ans)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
464
442
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
465 (defun yes-or-no-p (prompt)
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
466 "Ask user a yes-or-no question. Return t if answer is yes.
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
467 The question is asked with a dialog box or the minibuffer, as appropriate.
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
468 Takes one argument, which is the string to display to ask the question.
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
469 It should end in a space; `yes-or-no-p' adds `(yes or no) ' to it.
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
470 The user must confirm the answer with RET,
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
471 and can edit it until it as been confirmed."
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
472 (if (should-use-dialog-box-p)
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
473 (yes-or-no-p-dialog-box prompt)
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
474 (yes-or-no-p-minibuf prompt)))
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
475
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
476 (defun y-or-n-p (prompt)
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
477 "Ask user a \"y or n\" question. Return t if answer is \"y\".
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
478 Takes one argument, which is the string to display to ask the question.
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
479 The question is asked with a dialog box or the minibuffer, as appropriate.
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
480 It should end in a space; `y-or-n-p' adds `(y or n) ' to it.
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
481 No confirmation of the answer is requested; a single character is enough.
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
482 Also accepts Space to mean yes, or Delete to mean no."
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
483 (if (should-use-dialog-box-p)
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
484 (yes-or-no-p-dialog-box prompt)
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
485 (y-or-n-p-minibuf prompt)))
abe6d1db359e Import from CVS: tag r21-2-36
cvs
parents: 428
diff changeset
486
428
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
487
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
488
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
489 (defun read-char ()
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
490 "Read a character from the command input (keyboard or macro).
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
491 If a mouse click or non-ASCII character is detected, an error is
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
492 signalled. The character typed is returned as an ASCII value. This
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
493 is most likely the wrong thing for you to be using: consider using
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
494 the `next-command-event' function instead."
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
495 (save-excursion
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
496 (let ((event (next-command-event)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
497 (or inhibit-quit
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
498 (and (event-matches-key-specifier-p event (quit-char))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
499 (signal 'quit nil)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
500 (prog1 (or (event-to-character event)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
501 ;; Kludge. If the event we read was a mouse-release,
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
502 ;; discard it and read the next one.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
503 (if (button-release-event-p event)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
504 (event-to-character (next-command-event event)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
505 (error "Key read has no ASCII equivalent %S" event))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
506 ;; this is not necessary, but is marginally more efficient than GC.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
507 (deallocate-event event)))))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
508
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
509 (defun read-char-exclusive ()
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
510 "Read a character from the command input (keyboard or macro).
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
511 If a mouse click or non-ASCII character is detected, it is discarded.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
512 The character typed is returned as an ASCII value. This is most likely
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
513 the wrong thing for you to be using: consider using the
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
514 `next-command-event' function instead."
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
515 (let (event ch)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
516 (while (progn
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
517 (setq event (next-command-event))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
518 (or inhibit-quit
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
519 (and (event-matches-key-specifier-p event (quit-char))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
520 (signal 'quit nil)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
521 (setq ch (event-to-character event))
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522 (deallocate-event event)
3ecd8885ac67 Import from CVS: tag r21-2-22
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523 (null ch)))
3ecd8885ac67 Import from CVS: tag r21-2-22
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524 ch))
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525
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526 (defun read-quoted-char (&optional prompt)
3ecd8885ac67 Import from CVS: tag r21-2-22
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527 "Like `read-char', except that if the first character read is an octal
3ecd8885ac67 Import from CVS: tag r21-2-22
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528 digit, we read up to two more octal digits and return the character
3ecd8885ac67 Import from CVS: tag r21-2-22
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529 represented by the octal number consisting of those digits.
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530 Optional argument PROMPT specifies a string to use to prompt the user."
3ecd8885ac67 Import from CVS: tag r21-2-22
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531 (let ((count 0) (code 0) done
3ecd8885ac67 Import from CVS: tag r21-2-22
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532 (prompt (and prompt (gettext prompt)))
3ecd8885ac67 Import from CVS: tag r21-2-22
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533 char event)
3ecd8885ac67 Import from CVS: tag r21-2-22
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534 (while (and (not done) (< count 3))
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535 (let ((inhibit-quit (zerop count))
3ecd8885ac67 Import from CVS: tag r21-2-22
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536 ;; Don't let C-h get the help message--only help function keys.
3ecd8885ac67 Import from CVS: tag r21-2-22
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537 (help-char nil)
3ecd8885ac67 Import from CVS: tag r21-2-22
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538 (help-form
3ecd8885ac67 Import from CVS: tag r21-2-22
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539 "Type the special character you want to use,
3ecd8885ac67 Import from CVS: tag r21-2-22
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540 or three octal digits representing its character code."))
3ecd8885ac67 Import from CVS: tag r21-2-22
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541 (and prompt (display-message 'prompt (format "%s-" prompt)))
3ecd8885ac67 Import from CVS: tag r21-2-22
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542 (setq event (next-command-event)
3ecd8885ac67 Import from CVS: tag r21-2-22
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543 char (or (event-to-character event nil nil t)
3ecd8885ac67 Import from CVS: tag r21-2-22
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544 (signal 'error
3ecd8885ac67 Import from CVS: tag r21-2-22
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545 (list "key read cannot be inserted in a buffer"
3ecd8885ac67 Import from CVS: tag r21-2-22
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546 event))))
3ecd8885ac67 Import from CVS: tag r21-2-22
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547 (if inhibit-quit (setq quit-flag nil)))
3ecd8885ac67 Import from CVS: tag r21-2-22
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diff changeset
548 (cond ((<= ?0 char ?7)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
549 (setq code (+ (* code 8) (- char ?0))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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550 count (1+ count))
3ecd8885ac67 Import from CVS: tag r21-2-22
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551 (when prompt
3ecd8885ac67 Import from CVS: tag r21-2-22
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552 (display-message 'prompt
3ecd8885ac67 Import from CVS: tag r21-2-22
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diff changeset
553 (setq prompt (format "%s %c" prompt char)))))
3ecd8885ac67 Import from CVS: tag r21-2-22
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554 ((> count 0)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
555 (setq unread-command-event event
3ecd8885ac67 Import from CVS: tag r21-2-22
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556 done t))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
557 (t (setq code (char-int char)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
558 done t))))
3ecd8885ac67 Import from CVS: tag r21-2-22
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559 (int-char code)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
560 ;; Turn a meta-character into a character with the 0200 bit set.
3ecd8885ac67 Import from CVS: tag r21-2-22
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diff changeset
561 ; (logior (if (/= (logand code ?\M-\^@) 0) 128 0)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
562 ; (logand 255 code))))
3ecd8885ac67 Import from CVS: tag r21-2-22
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diff changeset
563 ))
3ecd8885ac67 Import from CVS: tag r21-2-22
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diff changeset
564
3ecd8885ac67 Import from CVS: tag r21-2-22
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565 (defun momentary-string-display (string pos &optional exit-char message)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
566 "Momentarily display STRING in the buffer at POS.
3ecd8885ac67 Import from CVS: tag r21-2-22
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567 Display remains until next character is typed.
3ecd8885ac67 Import from CVS: tag r21-2-22
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568 If the char is EXIT-CHAR (optional third arg, default is SPC) it is swallowed;
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
569 otherwise it is then available as input (as a command if nothing else).
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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570 Display MESSAGE (optional fourth arg) in the echo area.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
571 If MESSAGE is nil, instructions to type EXIT-CHAR are displayed there."
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
572 (or exit-char (setq exit-char ?\ ))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
573 (let ((buffer-read-only nil)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
574 ;; Don't modify the undo list at all.
3ecd8885ac67 Import from CVS: tag r21-2-22
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diff changeset
575 (buffer-undo-list t)
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
diff changeset
576 (modified (buffer-modified-p))
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
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577 (name buffer-file-name)
3ecd8885ac67 Import from CVS: tag r21-2-22
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578 insert-end)
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
diff changeset
579 (unwind-protect
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
diff changeset
580 (progn
3ecd8885ac67 Import from CVS: tag r21-2-22
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581 (save-excursion
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
diff changeset
582 (goto-char pos)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
583 ;; defeat file locking... don't try this at home, kids!
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
584 (setq buffer-file-name nil)
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
diff changeset
585 (insert-before-markers (gettext string))
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
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586 (setq insert-end (point))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
587 ;; If the message end is off frame, recenter now.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
588 (if (> (window-end) insert-end)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
589 (recenter (/ (window-height) 2)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
590 ;; If that pushed message start off the frame,
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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591 ;; scroll to start it at the top of the frame.
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
592 (move-to-window-line 0)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
593 (if (> (point) pos)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
594 (progn
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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diff changeset
595 (goto-char pos)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
596 (recenter 0))))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
597 (message (or message (gettext "Type %s to continue editing."))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
598 (single-key-description exit-char))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
599 (let ((event (save-excursion (next-command-event))))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
600 (or (eq (event-to-character event) exit-char)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
601 (setq unread-command-event event))))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
602 (if insert-end
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
603 (save-excursion
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
604 (delete-region pos insert-end)))
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
605 (setq buffer-file-name name)
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
606 (set-buffer-modified-p modified))))
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
diff changeset
607
3ecd8885ac67 Import from CVS: tag r21-2-22
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diff changeset
608 ;;; cmdloop.el ends here