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1 ;;; electric.el --- window maker and Command loop for `electric' modes.
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3 ;; Copyright (C) 1985, 1986, 1992, 1995 Free Software Foundation, Inc.
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4
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5 ;; Author: K. Shane Hartman
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6 ;; Maintainer: FSF
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7 ;; Keywords: extensions
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Synched up with: FSF 19.30.97.
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26
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27 ;;; Commentary:
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28
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29 ; zaaaaaaap
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30
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31 ;;; Code:
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32
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33 ;; This loop is the guts for non-standard modes which retain control
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34 ;; until some event occurs. It is a `do-forever', the only way out is
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35 ;; to throw. It assumes that you have set up the keymap, window, and
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36 ;; everything else: all it does is read commands and execute them -
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37 ;; providing error messages should one occur (if there is no loop
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38 ;; function - which see). The required argument is a tag which should
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39 ;; expect a value of nil if the user decides to punt. The second
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40 ;; argument is the prompt to be used: if nil, use "->", if 'noprompt,
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41 ;; don't use a prompt, if a string, use that string as prompt, and if
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42 ;; a function of no variable, it will be evaluated in every iteration
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43 ;; of the loop and its return value, which can be nil, 'noprompt or a
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44 ;; string, will be used as prompt. Given third argument non-nil, it
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45 ;; INHIBITS quitting unless the user types C-g at toplevel. This is
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46 ;; so user can do things like C-u C-g and not get thrown out. Fourth
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47 ;; argument, if non-nil, should be a function of two arguments which
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48 ;; is called after every command is executed. The fifth argument, if
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49 ;; provided, is the state variable for the function. If the
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50 ;; loop-function gets an error, the loop will abort WITHOUT throwing
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51 ;; (moral: use unwind-protect around call to this function for any
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52 ;; critical stuff). The second argument for the loop function is the
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53 ;; conditions for any error that occurred or nil if none.
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54
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55 (defun Electric-command-loop (return-tag
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56 &optional prompt inhibit-quit
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57 loop-function loop-state)
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58
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59 (let (cmd
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60 (err nil)
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61 (electrified-buffer (current-buffer)) ; XEmacs -
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62 (prompt-string prompt))
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63 (while t
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64 (if (not (or (stringp prompt) (eq prompt nil) (eq prompt 'noprompt)))
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65 (setq prompt-string (funcall prompt)))
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66 (if (not (stringp prompt-string))
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67 (if (eq prompt-string 'noprompt)
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68 (setq prompt-string nil)
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69 (setq prompt-string "->")))
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70 (setq cmd (read-key-sequence prompt-string))
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71 (or prefix-arg (setq last-command this-command))
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72 (setq last-command-event (aref cmd (1- (length cmd)))
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73 current-mouse-event
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74 (and (or (button-press-event-p last-command-event)
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75 (button-release-event-p last-command-event)
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76 (menu-event-p last-command-event))
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77 last-command-event)
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78 this-command (if (menu-event-p last-command-event)
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79 last-command-event
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80 (key-binding cmd t))
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81 cmd this-command)
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82 ;; This makes universal-argument-other-key work.
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83 (setq universal-argument-num-events 0)
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84 (if (or (prog1 quit-flag (setq quit-flag nil))
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85 (eq (event-to-character last-input-event) (quit-char)))
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86 (progn (setq unread-command-events nil
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87 prefix-arg nil)
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88 ;; If it wasn't cancelling a prefix character, then quit.
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89 (if (or (= (length (this-command-keys)) 1)
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90 (not inhibit-quit)) ; safety
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91 (progn (ding nil 'quit) ; XEmacs -
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92 (message "Quit")
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93 (throw return-tag nil))
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94 (setq cmd nil))))
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95 (setq current-prefix-arg prefix-arg)
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96 (if cmd
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97 (condition-case conditions
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98 (progn (if (eventp cmd)
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99 (progn
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100 (let ((b (current-buffer)))
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101 (dispatch-event cmd)
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102 (if (not (eq b (current-buffer)))
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103 (throw return-tag (current-buffer)))))
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104 (command-execute cmd))
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105 (setq last-command this-command)
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106 (if (or (prog1 quit-flag (setq quit-flag nil))
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107 (eq (event-to-character last-input-event)
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108 (quit-char)))
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109 (progn (setq unread-command-events nil)
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110 (if (not inhibit-quit)
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111 (progn (ding nil 'quit)
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112 (message "Quit")
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113 (throw return-tag nil))
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114 (message "Quit inhibited")
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115 (ding)))))
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116 (error (command-error conditions) ; XEmacs
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117 (sit-for 2)))
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118 (ding nil 'undefined-key))
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119 (and (not (eq (current-buffer) electrified-buffer)) ; XEmacs -
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120 (not (eq (selected-window) (minibuffer-window)))
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121 (progn (ding nil 'quit)
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122 (message "Leaving electric command loop %s."
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123 "because buffer has changed")
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124 (sit-for 2)
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125 (throw return-tag nil)))
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126 (if loop-function (funcall loop-function loop-state err))))
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127 ;; ####> - huh? It should be impossible to ever get here...
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128 (ding nil 'alarm)
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129 (throw return-tag nil))
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130
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131 ;; This function is like pop-to-buffer, sort of.
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132 ;; The algorithm is
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133 ;; If there is a window displaying buffer
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134 ;; Select it
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135 ;; Else if there is only one window
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136 ;; Split it, selecting the window on the bottom with height being
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137 ;; the lesser of max-height (if non-nil) and the number of lines in
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138 ;; the buffer to be displayed subject to window-min-height constraint.
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139 ;; Else
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140 ;; Switch to buffer in the current window.
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141 ;;
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142 ;; Then if max-height is nil, and not all of the lines in the buffer
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143 ;; are displayed, grab the whole frame.
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144 ;;
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145 ;; Returns selected window on buffer positioned at point-min.
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146
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147 (defun Electric-pop-up-window (buffer &optional max-height)
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148 (let* ((win (or (get-buffer-window buffer) (selected-window)))
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149 (buf (get-buffer buffer))
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150 (one-window (one-window-p t))
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151 (pop-up-windows t)
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152 (target-height)
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153 (lines))
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154 (if (not buf)
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155 (error "Buffer %s does not exist" buffer)
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156 (save-excursion
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157 (set-buffer buf)
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158 (setq lines (count-lines (point-min) (point-max)))
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159 (setq target-height
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160 (min (max (if max-height (min max-height (1+ lines)) (1+ lines))
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161 window-min-height)
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162 (save-window-excursion
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163 (delete-other-windows)
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164 (1- (window-height (selected-window)))))))
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165 (cond ((and (eq (window-buffer win) buf))
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166 (select-window win))
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167 (one-window
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168 (goto-char (window-start win))
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169 (pop-to-buffer buffer)
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170 (setq win (selected-window))
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171 (enlarge-window (- target-height (window-height win))))
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172 (t
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173 (switch-to-buffer buf)))
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174 (if (and (not max-height)
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175 (> target-height (window-height (selected-window))))
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176 (progn (goto-char (window-start win))
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177 (enlarge-window (- target-height (window-height win)))))
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178 (goto-char (point-min))
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179 win)))
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180
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181 (provide 'electric) ; zaaaaaaap
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182
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183 ;;; electric.el ends here
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