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1 ;;; resize-minibuffer.el --- dynamically resize minibuffer to display entire contents
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2
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3 ;; Copyright (C) 1990 Roland McGrath
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4 ;; Copyright (C) 1993, 1994 Noah S. Friedman
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5
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6 ;; Author: Noah Friedman <friedman@prep.ai.mit.edu>
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7 ;; Author: Roland McGrath <roland@prep.ai.mit.edu>
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8 ;; Modified for Lucid Emacs By: Peter Stout <pds@cs.cmu.edu>
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9 ;; Maintainer: friedman@prep.ai.mit.edu
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10 ;; Keywords: minibuffer, window, frames, display
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11
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12 ;; This file is part of XEmacs.
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13
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14 ;; XEmacs is free software; you can redistribute it and/or modify it
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15 ;; under the terms of the GNU General Public License as published by
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16 ;; the Free Software Foundation; either version 2, or (at your option)
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17 ;; any later version.
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18
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19 ;; XEmacs is distributed in the hope that it will be useful, but
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20 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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22 ;; General Public License for more details.
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23
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24 ;; You should have received a copy of the GNU General Public License
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25 ;; along with XEmacs; see the file COPYING. If not, you can either
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26 ;; send email to this program's maintainer or write to: The Free
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27 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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28 ;; 02111-1307, USA.
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29
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30 ;;; Synched up with: Not synched. Copied from rsz-minibuf.el to
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31 ;;; resize-minibuffer.el to avoid current problems where, when there's a
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32 ;;; file in dump and a file with the same name in packages, a dumping
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33 ;;; XEmacs will find the wrong one!
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34
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35 ;;; Commentary:
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36
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37 ;; This file has received maintenance by the XEmacs development team.
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38
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39 ;; $Id: resize-minibuffer.el,v 1.2 2002/03/13 08:52:08 ben Exp $
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40
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41 ;; This package allows the entire contents (or as much as possible) of the
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42 ;; minibuffer to be visible at once when typing. As the end of a line is
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43 ;; reached, the minibuffer will resize itself. When the user is done
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44 ;; typing, the minibuffer will return to its original size.
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45
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46 ;; In window systems where it is possible to have a frame in which the
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47 ;; minibuffer is the only window, the frame itself can be resized. In FSF
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48 ;; GNU Emacs 19.22 and earlier, the frame may not be properly returned to
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49 ;; its original size after it ceases to be active because
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50 ;; `minibuffer-exit-hook' didn't exist until version 19.23.
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51
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52 ;; NOTE: The code to resize frames has not been tested under Lucid Emacs,
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53 ;; because detached minibuffers are broken.
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54
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55 ;; Note that the minibuffer and echo area are not the same! They simply
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56 ;; happen to occupy roughly the same place on the frame. Messages put in
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57 ;; the echo area will not cause any resizing by this package.
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58
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59 ;; This package is considered a minor mode but it doesn't put anything in
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60 ;; minor-mode-alist because this mode is specific to the minibuffer, which
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61 ;; has no modeline.
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62
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63 ;; To use this package, put the following in your .emacs:
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64 ;;
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65 ;; (autoload 'resize-minibuffer-mode "rsz-minibuf" nil t)
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66 ;;
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67 ;; Invoking the command `resize-minibuffer-mode' will then enable this mode.
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68
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69 ;;; Code:
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70
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71
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72
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73 (defgroup resize-minibuffer nil
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74 "Dynamically resize minibuffer to display entire contents"
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75 :group 'frames)
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76
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77
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78 (defcustom resize-minibuffer-mode nil
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79 "*If non-`nil', resize the minibuffer so its entire contents are visible."
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80 :type 'boolean
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81 :require 'rsz-minibuf
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82 :group 'resize-minibuffer)
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83
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84 (defcustom resize-minibuffer-window-max-height nil
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85 "*Maximum size the minibuffer window is allowed to become.
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86 If less than 1 or not a number, the limit is the height of the frame in
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87 which the active minibuffer window resides."
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88 :type '(choice (const nil) integer)
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89 :group 'resize-minibuffer)
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90
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91 (defcustom resize-minibuffer-window-exactly t
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92 "*If non-`nil', make minibuffer exactly the size needed to display all its contents.
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93 Otherwise, the minibuffer window can temporarily increase in size but
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94 never get smaller while it is active."
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95 :type 'boolean
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96 :group 'resize-minibuffer)
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97
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98
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99 (defcustom resize-minibuffer-frame nil
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100 "*If non-`nil' and the active minibuffer is the sole window in its frame, allow changing the frame height."
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101 :type 'boolean
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102 :group 'resize-minibuffer)
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103
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104 (defcustom resize-minibuffer-frame-max-height nil
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105 "*Maximum size the minibuffer frame is allowed to become.
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106 If less than 1 or not a number, there is no limit.")
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107
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108 (defcustom resize-minibuffer-frame-exactly nil
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109 "*If non-`nil', make minibuffer frame exactly the size needed to display all its contents.
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110 Otherwise, the minibuffer frame can temporarily increase in size but
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111 never get smaller while it is active."
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112 :type 'boolean
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113 :group 'resize-minibuffer)
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114
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115
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116 ;;;###autoload
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117 (defun resize-minibuffer-mode (&optional prefix)
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118 "Enable or disable resize-minibuffer mode.
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119 A negative prefix argument disables this mode. A positive argument or
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120 argument of 0 enables it.
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121
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122 When this minor mode is enabled, the minibuffer is dynamically resized to
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123 contain the entire region of text put in it as you type.
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124
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125 The variable `resize-minibuffer-mode' is set to t or nil depending on
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126 whether this mode is active or not.
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127
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128 The maximum height to which the minibuffer can grow is controlled by the
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129 variable `resize-minibuffer-window-max-height'.
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130
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131 The variable `resize-minibuffer-window-exactly' determines whether the
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132 minibuffer window should ever be shrunk to make it no larger than needed to
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133 display its contents.
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134
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135 When using a window system, it is possible for a minibuffer to be the sole
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136 window in a frame. Since that window is already its maximum size, the only
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137 way to make more text visible at once is to increase the size of the frame.
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138 The variable `resize-minibuffer-frame' controls whether this should be
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139 done. The variables `resize-minibuffer-frame-max-height' and
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140 `resize-minibuffer-frame-exactly' are analogous to their window
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141 counterparts."
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142 (interactive "p")
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143 (or prefix (setq prefix 0))
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144 (cond
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145 ((>= prefix 0)
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146 (setq resize-minibuffer-mode t))
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147 (t
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148 (setq resize-minibuffer-mode nil))))
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149
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150 (defun resize-minibuffer-setup ()
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151 (cond
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152 (resize-minibuffer-mode
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153 (cond
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154 ((and (not (eq 'tty (console-type)))
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155 (eq 'only (plist-get (frame-properties) 'minibuffer)))
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156 (and resize-minibuffer-frame
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157 (progn
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158 (make-local-hook 'minibuffer-exit-hook)
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159 (add-hook 'minibuffer-exit-hook 'resize-minibuffer-frame-restore
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160 nil t)
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161 (make-local-hook 'post-command-hook)
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162 (add-hook 'post-command-hook 'resize-minibuffer-frame nil t)
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163 (unless (and (boundp 'icomplete-mode)
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164 icomplete-mode)
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165 (resize-minibuffer-frame)))))
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166 (t
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167 (make-local-hook 'post-command-hook)
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168 (add-hook 'post-command-hook 'resize-minibuffer-window nil t)
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169 (unless (and (boundp 'icomplete-mode)
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170 icomplete-mode)
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171 (resize-minibuffer-window)))))))
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172
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173 (defun resize-minibuffer-count-window-lines (&optional start end)
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174 "Return number of window lines occupied by text in region.
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175 The number of window lines may be greater than the number of actual lines
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176 in the buffer if any wrap on the display due to their length.
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177
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178 Optional arguments START and END default to point-min and point-max,
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179 respectively."
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180 (or start (setq start (point-min)))
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181 (or end (setq end (point-max)))
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182 (if (= start end)
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183 0
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184 (save-excursion
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185 (save-restriction
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186 (widen)
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187 (narrow-to-region start end)
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188 (goto-char start)
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189 (vertical-motion (buffer-size))))))
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190
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191
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192 ;; Resize the minibuffer window to contain the minibuffer's contents.
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193 ;; The minibuffer must be the current window.
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194 (defun resize-minibuffer-window ()
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195 (let ((height (window-height))
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196 (lines (1+ (resize-minibuffer-count-window-lines))))
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197 (and (numberp resize-minibuffer-window-max-height)
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198 (> resize-minibuffer-window-max-height 0)
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199 (setq lines (min
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200 lines
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201 resize-minibuffer-window-max-height)))
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202 (or (if resize-minibuffer-window-exactly
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203 (= lines height)
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204 (<= lines height))
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205 (enlarge-window (- lines height)))))
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206
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207
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208 ;; Resize the minibuffer frame to contain the minibuffer's contents.
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209 ;; The minibuffer frame must be the current frame.
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210 (defun resize-minibuffer-frame ()
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211 (let ((height (frame-height))
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212 (lines (1+ (resize-minibuffer-count-window-lines))))
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213 (and (numberp resize-minibuffer-frame-max-height)
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214 (> resize-minibuffer-frame-max-height 0)
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215 (setq lines (min
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216 lines
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217 resize-minibuffer-frame-max-height)))
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218 (cond
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219 ((> lines height)
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220 (set-frame-size (selected-frame) (frame-width) lines))
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221 ((and resize-minibuffer-frame-exactly
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222 (> height (plist-get minibuffer-frame-plist 'height))
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223 (< lines height))
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224 (set-frame-size (selected-frame) (frame-width) lines)))))
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225
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226 ;; Restore the original height of the frame.
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227 (defun resize-minibuffer-frame-restore ()
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228 (set-frame-size (selected-frame) (frame-width)
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229 (plist-get minibuffer-frame-plist 'height)))
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230
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231
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232 (provide 'rsz-minibuf)
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233
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234 (add-hook 'minibuffer-setup-hook 'resize-minibuffer-setup)
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235
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236 ;;; rsz-minibuf.el ends here
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