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209
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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 ;;#### This should really be a ring of last errors.
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110 (defvar last-error nil
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111 "#### Document me.")
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112
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113 (defcustom errors-deactivate-region nil
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114 "*Non-nil means that errors will cause the region to be deactivated."
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115 :type 'boolean
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116 :group 'editing-basics)
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117
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118 (defun command-error (error-object)
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119 (let ((inhibit-quit t)
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120 (debug-on-error nil)
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121 (etype (car-safe error-object)))
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122 (setq quit-flag nil)
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123 (setq standard-output t)
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124 (setq standard-input t)
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125 (setq executing-kbd-macro nil)
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126 (and errors-deactivate-region
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127 (zmacs-deactivate-region))
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128 (discard-input)
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129
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130 (setq last-error error-object)
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131
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132 (message nil)
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133 (ding nil (cond ((eq etype 'undefined-keystroke-sequence)
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134 (if (and (vectorp (nth 1 error-object))
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135 (/= 0 (length (nth 1 error-object)))
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136 (button-event-p (aref (nth 1 error-object) 0)))
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137 'undefined-click
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138 'undefined-key))
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139 ((eq etype 'quit)
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140 'quit)
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141 ((memq etype '(end-of-buffer beginning-of-buffer))
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142 'buffer-bound)
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143 ((eq etype 'buffer-read-only)
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144 'read-only)
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145 (t 'command-error)))
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146 (display-error error-object t)
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147
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148 (if (noninteractive)
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149 (progn
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150 (message "XEmacs exiting.")
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151 (kill-emacs -1)))
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152 t))
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153
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154 (defun describe-last-error ()
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155 "Redisplay the last error-message. See the variable `last-error'."
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156 (interactive)
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157 (with-displaying-help-buffer
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158 (lambda ()
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159 (princ "Last error was:\n" standard-output)
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160 (display-error last-error standard-output))))
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161
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162
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163 ;;#### Must be done later in the loadup sequence
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164 ;(define-key (symbol-function 'help-command) "e" 'describe-last-error)
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165
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166
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167 (defun truncate-command-history-for-gc ()
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168 (let ((tail (nthcdr 30 command-history)))
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169 (if tail (setcdr tail nil)))
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170 (let ((tail (nthcdr 30 values)))
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171 (if tail (setcdr tail nil)))
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172 )
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173
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174 (add-hook 'pre-gc-hook 'truncate-command-history-for-gc)
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175
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176
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177 ;;;; Object-oriented programming at its finest
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178
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179 ;; Now in src/print.c; used by Ferror_message_string and others
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180 ;(defun display-error (error-object stream) ;(defgeneric report-condition ...)
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181 ; "Display `error-object' on `stream' in a user-friendly way."
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182 ; (funcall (or (let ((type (car-safe error-object)))
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183 ; (catch 'error
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184 ; (and (consp error-object)
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185 ; (symbolp type)
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186 ; ;;(stringp (get type 'error-message))
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187 ; (consp (get type 'error-conditions))
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188 ; (let ((tail (cdr error-object)))
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189 ; (while (not (null tail))
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190 ; (if (consp tail)
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191 ; (setq tail (cdr tail))
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192 ; (throw 'error nil)))
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193 ; t)
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194 ; ;; (check-type condition condition)
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195 ; (get type 'error-conditions)
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196 ; ;; Search class hierarchy
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197 ; (let ((tail (get type 'error-conditions)))
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198 ; (while (not (null tail))
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199 ; (cond ((not (and (consp tail)
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200 ; (symbolp (car tail))))
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201 ; (throw 'error nil))
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202 ; ((get (car tail) 'display-error)
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203 ; (throw 'error (get (car tail)
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204 ; 'display-error)))
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205 ; (t
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206 ; (setq tail (cdr tail)))))
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207 ; ;; Default method
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208 ; #'(lambda (error-object stream)
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209 ; (let ((type (car error-object))
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210 ; (tail (cdr error-object))
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211 ; (first t)
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212 ; (print-message-label 'error))
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213 ; (if (eq type 'error)
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214 ; (progn (princ (car tail) stream)
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215 ; (setq tail (cdr tail)))
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216 ; (princ (or (gettext (get type 'error-message)) type)
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217 ; stream))
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218 ; (while tail
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219 ; (princ (if first ": " ", ") stream)
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220 ; (prin1 (car tail) stream)
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221 ; (setq tail (cdr tail)
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222 ; first nil))))))))
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223 ; #'(lambda (error-object stream)
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224 ; (princ (gettext "Peculiar error ") stream)
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225 ; (prin1 error-object stream)))
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226 ; error-object stream))
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227
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228 (put 'file-error 'display-error
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229 #'(lambda (error-object stream)
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230 (let ((tail (cdr error-object))
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231 (first t))
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232 (princ (car tail) stream)
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233 (while (setq tail (cdr tail))
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234 (princ (if first ": " ", ") stream)
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235 (princ (car tail) stream)
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236 (setq first nil)))))
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237
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238 (put 'undefined-keystroke-sequence 'display-error
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239 #'(lambda (error-object stream)
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240 (princ (key-description (car (cdr error-object))) stream)
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241 ;; #### I18N3: doesn't localize properly.
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242 (princ (gettext " not defined.") stream) ; doo dah, doo dah.
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243 ))
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244
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245
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246 (defcustom teach-extended-commands-p t
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247 "*If true, then `\\[execute-extended-command]' will teach you keybindings.
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248 Any time you execute a command with \\[execute-extended-command] which has a
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249 shorter keybinding, you will be shown the alternate binding before the
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250 command executes. There is a short pause after displaying the binding,
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251 before executing it; the length can be controlled by
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252 `teach-extended-commands-timeout'."
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253 :type 'boolean
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254 :group 'keyboard)
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255
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256 (defcustom teach-extended-commands-timeout 4
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257 "*How long to pause after displaying a keybinding before executing.
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258 The value is measured in seconds. This only applies if
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259 `teach-extended-commands-p' is true."
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260 :type 'number
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261 :group 'keyboard)
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262
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251
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263 ;;; This is implemented differently in GNU Emacs.
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264 ;;; We can't support both properly until we have Lisp magic variables.
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209
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265 ;(defvar suggest-key-bindings t
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266 ; "*FSFmacs equivalent of `teach-extended-commands-*'.
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267 ;Provided for compatibility only.
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268 ;Non-nil means show the equivalent key-binding when M-x command has one.
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269 ;The value can be a length of time to show the message for.
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270 ;If the value is non-nil and not a number, we wait 2 seconds.")
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271 ;
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272 ;(make-obsolete-variable 'suggest-key-bindings 'teach-extended-commands-p)
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273
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274 (defun execute-extended-command (prefix-arg)
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275 "Read a command name from the minibuffer using 'completing-read'.
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276 Then call the specified command using 'command-execute' and return its
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277 return value. If the command asks for a prefix argument, supply the
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278 value of the current raw prefix argument, or the value of PREFIX-ARG
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279 when called from Lisp."
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280 (interactive "P")
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281 ;; Note: This doesn't hack "this-command-keys"
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282 (let ((prefix-arg prefix-arg))
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283 (setq this-command (read-command
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284 ;; Note: this has the hard-wired
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285 ;; "C-u" and "M-x" string bug in common
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286 ;; with all GNU Emacs's.
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287 ;; (i.e. it prints C-u and M-x regardless of
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288 ;; whether some other keys were actually bound
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289 ;; to `execute-extended-command' and
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290 ;; `universal-argument'.
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291 (cond ((eq prefix-arg '-)
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292 "- M-x ")
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293 ((equal prefix-arg '(4))
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294 "C-u M-x ")
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295 ((integerp prefix-arg)
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296 (format "%d M-x " prefix-arg))
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297 ((and (consp prefix-arg)
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298 (integerp (car prefix-arg)))
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299 (format "%d M-x " (car prefix-arg)))
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300 (t
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301 "M-x ")))))
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302
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303 (if (and teach-extended-commands-p
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304 (interactive-p))
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305 ;; We need to fiddle with keys: remember the keys, run the
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306 ;; command, and show the keys (if any).
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307 (let ((_execute_command_keys_ (where-is-internal this-command))
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308 (_execute_command_name_ this-command)) ; the name can change
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309 (command-execute this-command t)
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310 (when (and _execute_command_keys_
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311 ;; Wait for a while, so the user can see a message
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312 ;; printed, if any.
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313 (sit-for 1))
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314 (display-message
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315 'no-log
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316 (format "Command `%s' is bound to key%s: %s"
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317 _execute_command_name_
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318 (if (cdr _execute_command_keys_) "s" "")
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319 (sorted-key-descriptions _execute_command_keys_)))
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320 (sit-for teach-extended-commands-timeout)
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321 (clear-message 'no-log)))
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322 ;; Else, just run the command.
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323 (command-execute this-command t)))
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324
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325
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326 ;;; C code calls this; the underscores in the variable names are to avoid
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327 ;;; cluttering the specbind namespace (lexical scope! lexical scope!)
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328 ;;; Putting this in Lisp instead of C slows kbd macros by 50%.
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329 ;(defun command-execute (_command &optional _record-flag)
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330 ; "Execute CMD as an editor command.
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331 ;CMD must be a symbol that satisfies the `commandp' predicate.
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332 ;Optional second arg RECORD-FLAG non-nil
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333 ;means unconditionally put this command in `command-history'.
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334 ;Otherwise, that is done only if an arg is read using the minibuffer."
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335 ; (let ((_prefix prefix-arg)
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336 ; (_cmd (indirect-function _command)))
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337 ; (setq prefix-arg nil
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338 ; this-command _command
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339 ; current-prefix-arg _prefix
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340 ; zmacs-region-stays nil)
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341 ; ;; #### debug_on_next_call = 0;
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342 ; (cond ((and (symbolp _command)
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343 ; (get _command 'disabled))
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344 ; (run-hooks disabled-command-hook))
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345 ; ((or (stringp _cmd) (vectorp _cmd))
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346 ; ;; If requested, place the macro in the command history.
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347 ; ;; For other sorts of commands, call-interactively takes
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348 ; ;; care of this.
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349 ; (if _record-flag
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350 ; (setq command-history
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351 ; (cons (list 'execute-kbd-macro _cmd _prefix)
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352 ; command-history)))
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353 ; (execute-kbd-macro _cmd _prefix))
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354 ; (t
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355 ; (call-interactively _command _record-flag)))))
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356
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357 (defun y-or-n-p-minibuf (prompt)
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358 "Ask user a \"y or n\" question. Return t if answer is \"y\".
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359 Takes one argument, which is the string to display to ask the question.
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360 It should end in a space; `y-or-n-p' adds `(y or n) ' to it.
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361 No confirmation of the answer is requested; a single character is enough.
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362 Also accepts Space to mean yes, or Delete to mean no."
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363 (save-excursion
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364 (let* ((pre "")
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365 (yn (gettext "(y or n) "))
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366 ;; we need to translate the prompt ourselves because of the
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367 ;; strange way we handle it.
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368 (prompt (gettext prompt))
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369 event)
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370 (while (stringp yn)
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371 (if (let ((cursor-in-echo-area t)
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372 (inhibit-quit t))
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373 (message "%s%s%s" pre prompt yn)
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374 (setq event (next-command-event event))
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375 (condition-case nil
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376 (prog1
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377 (or quit-flag (eq 'keyboard-quit (key-binding event)))
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378 (setq quit-flag nil))
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379 (wrong-type-argument t)))
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380 (progn
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381 (message "%s%s%s%s" pre prompt yn (single-key-description event))
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382 (setq quit-flag nil)
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383 (signal 'quit '())))
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384 (let* ((keys (events-to-keys (vector event)))
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385 (def (lookup-key query-replace-map keys)))
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386 (cond ((eq def 'skip)
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387 (message "%s%sNo" prompt yn)
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388 (setq yn nil))
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389 ((eq def 'act)
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390 (message "%s%sYes" prompt yn)
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391 (setq yn t))
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392 ((eq def 'recenter)
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393 (recenter))
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394 ((or (eq def 'quit) (eq def 'exit-prefix))
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395 (signal 'quit '()))
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396 ((button-release-event-p event) ; ignore them
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397 nil)
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398 (t
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399 (message "%s%s%s%s" pre prompt yn
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400 (single-key-description event))
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401 (ding nil 'y-or-n-p)
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402 (discard-input)
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403 (if (= (length pre) 0)
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404 (setq pre (gettext "Please answer y or n. ")))))))
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405 yn)))
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406
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407 (defun yes-or-no-p-minibuf (prompt)
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408 "Ask user a yes-or-no question. Return t if answer is yes.
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409 Takes one argument, which is the string to display to ask the question.
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410 It should end in a space; `yes-or-no-p' adds `(yes or no) ' to it.
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411 The user must confirm the answer with RET,
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412 and can edit it until it has been confirmed."
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413 (save-excursion
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414 (let ((p (concat (gettext prompt) (gettext "(yes or no) ")))
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415 (ans ""))
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416 (while (stringp ans)
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417 (setq ans (downcase (read-string p nil t))) ;no history
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418 (cond ((string-equal ans (gettext "yes"))
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419 (setq ans 't))
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420 ((string-equal ans (gettext "no"))
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421 (setq ans 'nil))
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422 (t
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423 (ding nil 'yes-or-no-p)
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424 (discard-input)
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425 (message "Please answer yes or no.")
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426 (sleep-for 2))))
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427 ans)))
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428
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429 ;; these may be redefined later, but make the original def easily encapsulable
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430 (define-function 'yes-or-no-p 'yes-or-no-p-minibuf)
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431 (define-function 'y-or-n-p 'y-or-n-p-minibuf)
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432
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433
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434 (defun read-char ()
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435 "Read a character from the command input (keyboard or macro).
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436 If a mouse click or non-ASCII character is detected, an error is
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437 signalled. The character typed is returned as an ASCII value. This
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438 is most likely the wrong thing for you to be using: consider using
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439 the `next-command-event' function instead."
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440 (save-excursion
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441 (let* ((inhibit-quit t)
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442 (event (next-command-event)))
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443 (prog1 (or (event-to-character event)
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444 ;; Kludge. If the event we read was a mouse-release,
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445 ;; discard it and read the next one.
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446 (if (button-release-event-p event)
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447 (event-to-character (next-command-event event)))
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448 (error "Key read has no ASCII equivalent %S" event))
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449 ;; this is not necessary, but is marginally more efficient than GC.
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450 (deallocate-event event)))))
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451
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452 (defun read-char-exclusive ()
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453 "Read a character from the command input (keyboard or macro).
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454 If a mouse click or non-ASCII character is detected, it is discarded.
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455 The character typed is returned as an ASCII value. This is most likely
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456 the wrong thing for you to be using: consider using the
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457 `next-command-event' function instead."
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458 (let ((inhibit-quit t)
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459 event ch)
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460 (while (progn
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461 (setq event (next-command-event))
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462 (setq ch (event-to-character event))
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463 (deallocate-event event)
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464 (null ch)))
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465 ch))
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466
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467 (defun read-quoted-char (&optional prompt)
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468 "Like `read-char', except that if the first character read is an octal
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469 digit, we read up to two more octal digits and return the character
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470 represented by the octal number consisting of those digits.
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471 Optional argument PROMPT specifies a string to use to prompt the user."
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472 (save-excursion
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473 (let ((count 0) (code 0)
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474 (prompt (and prompt (gettext prompt)))
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475 char event)
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476 (while (< count 3)
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477 (let ((inhibit-quit (zerop count))
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478 ;; Don't let C-h get the help message--only help function keys.
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479 (help-char nil)
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480 (help-form
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481 "Type the special character you want to use,
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482 or three octal digits representing its character code."))
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483 (and prompt (display-message 'prompt (format "%s-" prompt)))
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484 (setq event (next-command-event)
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485 char (or (event-to-character event nil nil t)
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486 (error "key read cannot be inserted in a buffer: %S"
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487 event)))
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488 (if inhibit-quit (setq quit-flag nil)))
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489 (cond ((null char))
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490 ((and (<= ?0 char) (<= char ?7))
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491 (setq code (+ (* code 8) (- char ?0))
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492 count (1+ count))
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493 (and prompt (display-message
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494 'prompt
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495 (setq prompt (format "%s %c" prompt char)))))
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496 ((> count 0)
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497 (setq unread-command-event event
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498 count 259))
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499 (t (setq code char count 259))))
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500 ;; Turn a meta-character into a character with the 0200 bit set.
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501 (logior (if (/= (logand code ?\M-\^@) 0) 128 0)
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502 (logand 255 code)))))
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503
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504 (defun momentary-string-display (string pos &optional exit-char message)
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505 "Momentarily display STRING in the buffer at POS.
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506 Display remains until next character is typed.
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507 If the char is EXIT-CHAR (optional third arg, default is SPC) it is swallowed;
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508 otherwise it is then available as input (as a command if nothing else).
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509 Display MESSAGE (optional fourth arg) in the echo area.
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510 If MESSAGE is nil, instructions to type EXIT-CHAR are displayed there."
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511 (or exit-char (setq exit-char ?\ ))
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512 (let ((buffer-read-only nil)
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513 ;; Don't modify the undo list at all.
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514 (buffer-undo-list t)
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515 (modified (buffer-modified-p))
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516 (name buffer-file-name)
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517 insert-end)
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518 (unwind-protect
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519 (progn
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520 (save-excursion
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521 (goto-char pos)
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522 ;; defeat file locking... don't try this at home, kids!
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523 (setq buffer-file-name nil)
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524 (insert-before-markers (gettext string))
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|
525 (setq insert-end (point))
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|
526 ;; If the message end is off frame, recenter now.
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|
|
527 (if (> (window-end) insert-end)
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|
|
528 (recenter (/ (window-height) 2)))
|
|
|
529 ;; If that pushed message start off the frame,
|
|
|
530 ;; scroll to start it at the top of the frame.
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|
|
531 (move-to-window-line 0)
|
|
|
532 (if (> (point) pos)
|
|
|
533 (progn
|
|
|
534 (goto-char pos)
|
|
|
535 (recenter 0))))
|
|
|
536 (message (or message (gettext "Type %s to continue editing."))
|
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|
537 (single-key-description exit-char))
|
|
|
538 (let ((event (save-excursion (next-command-event))))
|
|
|
539 (or (eq (event-to-character event) exit-char)
|
|
|
540 (setq unread-command-event event))))
|
|
|
541 (if insert-end
|
|
|
542 (save-excursion
|
|
|
543 (delete-region pos insert-end)))
|
|
|
544 (setq buffer-file-name name)
|
|
|
545 (set-buffer-modified-p modified))))
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546
|
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547 ;;; cmdloop.el ends here
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