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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, 1993, 1994 Free Software Foundation, Inc.
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4
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5 ;; This file is part of XEmacs.
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6
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7 ;; XEmacs is free software; you can redistribute it and/or modify it
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8 ;; under the terms of the GNU General Public License as published by
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9 ;; the Free Software Foundation; either version 2, or (at your option)
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10 ;; any later version.
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11
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12 ;; XEmacs is distributed in the hope that it will be useful, but
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13 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 ;; General Public License for more details.
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16
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17 ;; You should have received a copy of the GNU General Public License
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16
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18 ;; along with XEmacs; see the file COPYING. If not, write to the
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70
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19 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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20 ;; Boston, MA 02111-1307, USA.
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21
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22 ;;; Synched up with: FSF 19.30. (Some of the stuff below is in FSF's subr.el.)
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23
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24 ;; Written by Richard Mlynarik 8-Jul-92
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25
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26 (defun recursion-depth ()
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27 "Return the current depth in recursive edits."
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28 (+ command-loop-level (minibuffer-depth)))
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29
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30 (defun top-level ()
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31 "Exit all recursive editing levels."
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32 (interactive)
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33 (throw 'top-level nil))
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34
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35 (defun exit-recursive-edit ()
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36 "Exit from the innermost recursive edit or minibuffer."
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37 (interactive)
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38 (if (> (recursion-depth) 0)
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39 (throw 'exit nil))
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40 (error "No recursive edit is in progress"))
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41
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42 (defun abort-recursive-edit ()
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43 "Abort the command that requested this recursive edit or minibuffer input."
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44 (interactive)
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45 (if (> (recursion-depth) 0)
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46 (throw 'exit t))
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47 (error "No recursive edit is in progress"))
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48
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49 ;; (defun keyboard-quit ()
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50 ;; "Signal a `quit' condition."
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51 ;; (interactive)
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52 ;; (deactivate-mark)
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53 ;; (signal 'quit nil))
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54
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55 ;; moved here from pending-del.
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56 (defun keyboard-quit ()
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57 "Signal a `quit' condition.
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58 If this character is typed while lisp code is executing, it will be treated
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59 as an interrupt.
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60 If this character is typed at top-level, this simply beeps.
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61 If `zmacs-regions' is true, and the zmacs region is active, then this
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62 key deactivates the region without beeping or signalling."
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63 (interactive)
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64 (if (and zmacs-regions (zmacs-deactivate-region))
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65 ;; pseudo-zmacs compatibility: don't beep if this ^G is simply
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66 ;; deactivating the region. If it is inactive, beep.
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67 nil
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68 (signal 'quit nil)))
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69
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70 (defvar buffer-quit-function nil
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71 "Function to call to \"quit\" the current buffer, or nil if none.
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72 \\[keyboard-escape-quit] calls this function when its more local actions
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73 \(such as cancelling a prefix argument, minibuffer or region) do not apply.")
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74
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75 (defun keyboard-escape-quit ()
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76 "Exit the current \"mode\" (in a generalized sense of the word).
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77 This command can exit an interactive command such as `query-replace',
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78 can clear out a prefix argument or a region,
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79 can get out of the minibuffer or other recursive edit,
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80 cancel the use of the current buffer (for special-purpose buffers),
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81 or go back to just one window (by deleting all but the selected window)."
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82 (interactive)
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83 (cond ((eq last-command 'mode-exited) nil)
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84 ((> (minibuffer-depth) 0)
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85 (abort-recursive-edit))
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86 (current-prefix-arg
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87 nil)
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88 ((region-active-p)
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89 (zmacs-deactivate-region))
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90 (buffer-quit-function
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91 (funcall buffer-quit-function))
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92 ((not (one-window-p t))
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93 (delete-other-windows))))
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94
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95 ;;#### This should really be a ring of last errors.
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96 (defvar last-error nil
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97 "#### Document me.")
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98
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99 (defun command-error (error-object)
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100 (let ((inhibit-quit t)
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101 (debug-on-error nil)
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102 (etype (car-safe error-object)))
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103 (setq quit-flag nil)
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104 (setq standard-output t)
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105 (setq standard-input t)
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106 (setq executing-kbd-macro nil)
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107 (zmacs-deactivate-region)
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108 (discard-input)
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109
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110 (setq last-error error-object)
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111
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112 (message nil)
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113 (ding nil (cond ((eq etype 'undefined-keystroke-sequence)
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114 (if (and (vectorp (nth 1 error-object))
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115 (/= 0 (length (nth 1 error-object)))
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116 (button-event-p (aref (nth 1 error-object) 0)))
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117 'undefined-click
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118 'undefined-key))
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119 ((eq etype 'quit)
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120 'quit)
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121 ((memq etype '(end-of-buffer beginning-of-buffer))
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122 'buffer-bound)
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123 ((eq etype 'buffer-read-only)
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124 'read-only)
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125 (t 'command-error)))
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126 (display-error error-object t)
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127
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128 (if (noninteractive)
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129 (progn
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130 (message "XEmacs exiting.")
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131 (kill-emacs -1)))
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132 t))
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133
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134 (defun describe-last-error ()
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135 "Redisplay the last error-message. See the variable `last-error'."
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136 (interactive)
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137 (with-displaying-help-buffer
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2
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138 (lambda ()
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139 (princ "Last error was:\n" standard-output)
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140 (display-error last-error standard-output))))
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141
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142
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143 ;;#### Must be done later in the loadup sequence
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144 ;(define-key (symbol-function 'help-command) "e" 'describe-last-error)
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145
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146
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147 (defun truncate-command-history-for-gc ()
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148 (let ((tail (nthcdr 30 command-history)))
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149 (if tail (setcdr tail nil)))
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150 (let ((tail (nthcdr 30 values)))
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151 (if tail (setcdr tail nil)))
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152 )
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153
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154 (add-hook 'pre-gc-hook 'truncate-command-history-for-gc)
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155
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156
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157 ;;;; Object-oriented programming at its finest
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158
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159 (defun display-error (error-object stream) ;(defgeneric report-condition ...)
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160 "Display `error-object' on `stream' in a user-friendly way."
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161 (funcall (or (let ((type (car-safe error-object)))
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162 (catch 'error
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163 (and (consp error-object)
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164 (symbolp type)
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165 ;;(stringp (get type 'error-message))
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166 (consp (get type 'error-conditions))
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167 (let ((tail (cdr error-object)))
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168 (while (not (null tail))
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169 (if (consp tail)
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170 (setq tail (cdr tail))
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171 (throw 'error nil)))
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172 t)
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173 ;; (check-type condition condition)
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174 (get type 'error-conditions)
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175 ;; Search class hierarchy
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176 (let ((tail (get type 'error-conditions)))
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177 (while (not (null tail))
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178 (cond ((not (and (consp tail)
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179 (symbolp (car tail))))
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180 (throw 'error nil))
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181 ((get (car tail) 'display-error)
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182 (throw 'error (get (car tail)
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183 'display-error)))
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184 (t
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185 (setq tail (cdr tail)))))
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186 ;; Default method
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187 #'(lambda (error-object stream)
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188 (let ((type (car error-object))
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189 (tail (cdr error-object))
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190 (first t)
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191 (print-message-label 'error))
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192 (if (eq type 'error)
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193 (progn (princ (car tail) stream)
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194 (setq tail (cdr tail)))
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195 (princ (or (gettext (get type 'error-message)) type)
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196 stream))
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197 (while tail
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198 (princ (if first ": " ", ") stream)
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199 (prin1 (car tail) stream)
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200 (setq tail (cdr tail)
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201 first nil))))))))
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202 #'(lambda (error-object stream)
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203 (princ (gettext "Peculiar error ") stream)
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204 (prin1 error-object stream)))
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205 error-object stream))
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206
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207 (put 'file-error 'display-error
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208 #'(lambda (error-object stream)
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209 (let ((tail (cdr error-object))
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210 (first t))
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211 (princ (car tail) stream)
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212 (while (setq tail (cdr tail))
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213 (princ (if first ": " ", ") stream)
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214 (princ (car tail) stream)
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215 (setq first nil)))))
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216
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217 (put 'undefined-keystroke-sequence 'display-error
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218 #'(lambda (error-object stream)
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219 (princ (key-description (car (cdr error-object))) stream)
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220 ;; #### I18N3: doesn't localize properly.
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221 (princ (gettext " not defined.") stream) ; doo dah, doo dah.
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222 ))
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223
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224
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225 (defvar teach-extended-commands-p t
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226 "*If true, then `\\[execute-extended-command]' will teach you keybindings.
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227 Any time you execute a command with \\[execute-extended-command] which has a
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228 shorter keybinding, you will be shown the alternate binding before the
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229 command executes. There is a short pause after displaying the binding,
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230 before executing it; the length can be controlled by
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231 `teach-extended-commands-timeout'.")
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232
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233 (defvar teach-extended-commands-timeout 2
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234 "*How long to pause after displaying a keybinding before executing.
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235 The value is measured in seconds. This only applies if
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236 `teach-extended-commands-p' is true.")
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237
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238 ;That damn RMS went off and implemented something differently, after
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239 ;we had already implemented it. We can't support both properly until
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240 ;we have Lisp magic variables.
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241 ;(defvar suggest-key-bindings t
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242 ; "*FSFmacs equivalent of `teach-extended-commands-*'.
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243 ;Provided for compatibility only.
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244 ;Non-nil means show the equivalent key-binding when M-x command has one.
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245 ;The value can be a length of time to show the message for.
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246 ;If the value is non-nil and not a number, we wait 2 seconds.")
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247 ;
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248 ;(make-obsolete-variable 'suggest-key-bindings 'teach-extended-commands-p)
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249
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250 (defun execute-extended-command (prefix-arg)
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251 "Read a command name from the minibuffer using 'completing-read'.
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252 Then call the specified command using 'command-execute' and return its
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253 return value. If the command asks for a prefix argument, supply the
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254 value of the current raw prefix argument, or the value of PREFIX-ARG
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255 when called from Lisp."
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256 (interactive "P")
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257 ;; Note: This doesn't hack "this-command-keys"
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258 (let ((prefix-arg prefix-arg))
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259 (setq this-command (read-command
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260 ;; Note: this has the hard-wired
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261 ;; "C-u" and "M-x" string bug in common
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262 ;; with all GNU Emacs's.
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263 ;; (i.e. it prints C-u and M-x regardless of
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264 ;; whether some other keys were actually bound
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265 ;; to `execute-extended-command' and
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266 ;; `universal-argument'.
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267 (cond ((eq prefix-arg '-)
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268 "- M-x ")
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269 ((equal prefix-arg '(4))
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270 "C-u M-x ")
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271 ((integerp prefix-arg)
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272 (format "%d M-x " prefix-arg))
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273 ((and (consp prefix-arg)
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274 (integerp (car prefix-arg)))
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275 (format "%d M-x " (car prefix-arg)))
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276 (t
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277 "M-x ")))))
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278
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279 (if (and teach-extended-commands-p (interactive-p))
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280 (let ((keys (where-is-internal this-command)))
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281 (if keys
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282 (progn
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283 (message "M-x %s (bound to key%s: %s)"
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284 this-command
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285 (if (cdr keys) "s" "")
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286 (mapconcat 'key-description
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287 (sort keys #'(lambda (x y)
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288 (< (length x) (length y))))
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289 ", "))
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290 (sit-for teach-extended-commands-timeout)))))
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291
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292 (command-execute this-command t))
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293
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294
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295 ;;; C code calls this; the underscores in the variable names are to avoid
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296 ;;; cluttering the specbind namespace (lexical scope! lexical scope!)
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297 ;;; Putting this in Lisp instead of C slows kbd macros by 50%.
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298 ;(defun command-execute (_command &optional _record-flag)
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299 ; "Execute CMD as an editor command.
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300 ;CMD must be a symbol that satisfies the `commandp' predicate.
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301 ;Optional second arg RECORD-FLAG non-nil
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302 ;means unconditionally put this command in `command-history'.
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303 ;Otherwise, that is done only if an arg is read using the minibuffer."
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304 ; (let ((_prefix prefix-arg)
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305 ; (_cmd (indirect-function _command)))
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306 ; (setq prefix-arg nil
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307 ; this-command _command
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308 ; current-prefix-arg _prefix
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309 ; zmacs-region-stays nil)
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310 ; ;; #### debug_on_next_call = 0;
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311 ; (cond ((and (symbolp _command)
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312 ; (get _command 'disabled))
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313 ; (run-hooks disabled-command-hook))
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314 ; ((or (stringp _cmd) (vectorp _cmd))
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315 ; ;; If requested, place the macro in the command history.
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316 ; ;; For other sorts of commands, call-interactively takes
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317 ; ;; care of this.
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318 ; (if _record-flag
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319 ; (setq command-history
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320 ; (cons (list 'execute-kbd-macro _cmd _prefix)
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321 ; command-history)))
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322 ; (execute-kbd-macro _cmd _prefix))
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323 ; (t
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324 ; (call-interactively _command _record-flag)))))
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325
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326 (defun y-or-n-p-minibuf (prompt)
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327 "Ask user a \"y or n\" question. Return t if answer is \"y\".
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328 Takes one argument, which is the string to display to ask the question.
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329 It should end in a space; `y-or-n-p' adds `(y or n) ' to it.
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330 No confirmation of the answer is requested; a single character is enough.
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331 Also accepts Space to mean yes, or Delete to mean no."
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332 (save-excursion
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333 (let* ((pre "")
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334 (yn (gettext "(y or n) "))
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335 ;; we need to translate the prompt ourselves because of the
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336 ;; strange way we handle it.
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337 (prompt (gettext prompt))
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338 event)
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339 (while (stringp yn)
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340 (if (let ((cursor-in-echo-area t)
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341 (inhibit-quit t))
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342 (message "%s%s%s" pre prompt yn)
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343 (setq event (next-command-event event))
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70
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344 (prog1
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345 (or quit-flag (eq 'keyboard-quit (key-binding event)))
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346 (setq quit-flag nil)))
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0
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347 (progn
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348 (message "%s%s%s%s" pre prompt yn (single-key-description event))
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349 (setq quit-flag nil)
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350 (signal 'quit '())))
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351 (let* ((keys (events-to-keys (vector event)))
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352 (def (lookup-key query-replace-map keys)))
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353 (cond ((eq def 'skip)
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354 (message "%s%sNo" prompt yn)
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355 (setq yn nil))
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356 ((eq def 'act)
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357 (message "%s%sYes" prompt yn)
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358 (setq yn t))
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359 ((eq def 'recenter)
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360 (recenter))
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361 ((or (eq def 'quit) (eq def 'exit-prefix))
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362 (signal 'quit '()))
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363 ((button-release-event-p event) ; ignore them
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364 nil)
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365 (t
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366 (message "%s%s%s%s" pre prompt yn
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367 (single-key-description event))
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368 (ding nil 'y-or-n-p)
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369 (discard-input)
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370 (if (= (length pre) 0)
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371 (setq pre (gettext "Please answer y or n. ")))))))
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372 yn)))
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373
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374 (defun yes-or-no-p-minibuf (prompt)
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375 "Ask user a yes-or-no question. Return t if answer is yes.
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376 Takes one argument, which is the string to display to ask the question.
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377 It should end in a space; `yes-or-no-p' adds `(yes or no) ' to it.
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378 The user must confirm the answer with RET,
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379 and can edit it until it has been confirmed."
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380 (save-excursion
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381 (let ((p (concat (gettext prompt) (gettext "(yes or no) ")))
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382 (ans ""))
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383 (while (stringp ans)
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384 (setq ans (downcase (read-string p nil t))) ;no history
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385 (cond ((string-equal ans (gettext "yes"))
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386 (setq ans 't))
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387 ((string-equal ans (gettext "no"))
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388 (setq ans 'nil))
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389 (t
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390 (ding nil 'yes-or-no-p)
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391 (discard-input)
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392 (message "Please answer yes or no.")
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393 (sleep-for 2))))
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394 ans)))
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395
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396 ;; these may be redefined later, but make the original def easily encapsulable
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397 (define-function 'yes-or-no-p 'yes-or-no-p-minibuf)
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398 (define-function 'y-or-n-p 'y-or-n-p-minibuf)
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399
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400
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401 (defun read-char ()
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402 "Read a character from the command input (keyboard or macro).
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403 If a mouse click or non-ASCII character is detected, an error is
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404 signalled. The character typed is returned as an ASCII value. This
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405 is most likely the wrong thing for you to be using: consider using
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406 the `next-command-event' function instead."
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407 (save-excursion
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408 (let ((inhibit-quit t)
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409 (event (next-command-event)))
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410 (prog1 (or (event-to-character event)
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411 ;; Kludge. If the event we read was a mouse-release,
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412 ;; discard it and read the next one.
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413 (if (button-release-event-p event)
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414 (event-to-character (next-command-event event)))
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415 (error "Key read has no ASCII equivalent %S" event))
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416 ;; this is not necessary, but is marginally more efficient than GC.
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417 (deallocate-event event)))))
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418
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419 (defun read-char-exclusive ()
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420 "Read a character from the command input (keyboard or macro).
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421 If a mouse click or non-ASCII character is detected, it is discarded.
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422 The character typed is returned as an ASCII value. This is most likely
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423 the wrong thing for you to be using: consider using the
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424 `next-command-event' function instead."
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425 (let ((inhibit-quit t)
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426 event ch)
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427 (while (progn
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428 (setq event (next-command-event))
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429 (setq ch (event-to-character event))
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430 (deallocate-event event)
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431 (null ch)))
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432 ch))
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433
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434 (defun read-quoted-char (&optional prompt)
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435 "Like `read-char', except that if the first character read is an octal
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436 digit, we read up to two more octal digits and return the character
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437 represented by the octal number consisting of those digits.
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438 Optional argument PROMPT specifies a string to use to prompt the user."
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439 (save-excursion
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440 (let ((count 0) (code 0)
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441 (prompt (and prompt (gettext prompt)))
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442 char event)
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443 (while (< count 3)
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444 (let ((inhibit-quit (zerop count))
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445 ;; Don't let C-h get the help message--only help function keys.
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446 (help-char nil)
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447 (help-form
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448 "Type the special character you want to use,
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449 or three octal digits representing its character code."))
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450 (and prompt (display-message 'prompt (format "%s-" prompt)))
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451 (setq event (next-command-event)
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452 char (or (event-to-character event nil nil t)
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453 (error "key read cannot be inserted in a buffer: %S"
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454 event)))
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455 (if inhibit-quit (setq quit-flag nil)))
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456 (cond ((null char))
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457 ((and (<= ?0 char) (<= char ?7))
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458 (setq code (+ (* code 8) (- char ?0))
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459 count (1+ count))
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460 (and prompt (display-message
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461 'prompt
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462 (setq prompt (format "%s %c" prompt char)))))
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463 ((> count 0)
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464 (setq unread-command-event event
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465 count 259))
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466 (t (setq code char count 259))))
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467 ;; Turn a meta-character into a character with the 0200 bit set.
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468 (logior (if (/= (logand code ?\M-\^@) 0) 128 0)
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469 (logand 255 code)))))
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470
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471 (defun momentary-string-display (string pos &optional exit-char message)
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472 "Momentarily display STRING in the buffer at POS.
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473 Display remains until next character is typed.
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474 If the char is EXIT-CHAR (optional third arg, default is SPC) it is swallowed;
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475 otherwise it is then available as input (as a command if nothing else).
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476 Display MESSAGE (optional fourth arg) in the echo area.
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477 If MESSAGE is nil, instructions to type EXIT-CHAR are displayed there."
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478 (or exit-char (setq exit-char ?\ ))
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479 (let ((buffer-read-only nil)
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480 ;; Don't modify the undo list at all.
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481 (buffer-undo-list t)
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482 (modified (buffer-modified-p))
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483 (name buffer-file-name)
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484 insert-end)
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485 (unwind-protect
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486 (progn
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487 (save-excursion
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488 (goto-char pos)
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489 ;; defeat file locking... don't try this at home, kids!
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490 (setq buffer-file-name nil)
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491 (insert-before-markers (gettext string))
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492 (setq insert-end (point))
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|
493 ;; If the message end is off frame, recenter now.
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|
|
494 (if (> (window-end) insert-end)
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|
495 (recenter (/ (window-height) 2)))
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|
496 ;; If that pushed message start off the frame,
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|
497 ;; scroll to start it at the top of the frame.
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|
498 (move-to-window-line 0)
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499 (if (> (point) pos)
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|
500 (progn
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|
501 (goto-char pos)
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|
|
502 (recenter 0))))
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|
503 (message (or message (gettext "Type %s to continue editing."))
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|
504 (single-key-description exit-char))
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|
505 (let ((event (save-excursion (next-command-event))))
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506 (or (eq (event-to-character event) exit-char)
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|
507 (setq unread-command-event event))))
|
|
|
508 (if insert-end
|
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|
509 (save-excursion
|
|
|
510 (delete-region pos insert-end)))
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|
511 (setq buffer-file-name name)
|
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|
512 (set-buffer-modified-p modified))))
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513
|
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514 ;;; cmdloop.el ends here
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