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1 ;;; rsz-minibuf.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.
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31
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32 ;;; Commentary:
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33
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34 ;; This file has received maintenance by the XEmacs development team.
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35
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36 ;; $Id: rsz-minibuf.el,v 1.6 1997/09/17 05:19:26 steve Exp $
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37
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38 ;; This package allows the entire contents (or as much as possible) of the
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39 ;; minibuffer to be visible at once when typing. As the end of a line is
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40 ;; reached, the minibuffer will resize itself. When the user is done
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41 ;; typing, the minibuffer will return to its original size.
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42
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43 ;; In window systems where it is possible to have a frame in which the
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44 ;; minibuffer is the only window, the frame itself can be resized. In FSF
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45 ;; GNU Emacs 19.22 and earlier, the frame may not be properly returned to
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46 ;; its original size after it ceases to be active because
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47 ;; `minibuffer-exit-hook' didn't exist until version 19.23.
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48
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49 ;; NOTE: The code to resize frames has not been tested under Lucid Emacs,
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50 ;; because detached minibuffers are broken.
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51
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52 ;; Note that the minibuffer and echo area are not the same! They simply
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53 ;; happen to occupy roughly the same place on the frame. Messages put in
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54 ;; the echo area will not cause any resizing by this package.
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55
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56 ;; This package is considered a minor mode but it doesn't put anything in
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57 ;; minor-mode-alist because this mode is specific to the minibuffer, which
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58 ;; has no modeline.
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59
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60 ;; To use this package, put the following in your .emacs:
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61 ;;
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62 ;; (autoload 'resize-minibuffer-mode "rsz-minibuf" nil t)
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63 ;;
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64 ;; Invoking the command `resize-minibuffer-mode' will then enable this mode.
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65
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66 ;;; Code:
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67
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68
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69
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70 (defgroup resize-minibuffer nil
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71 "Dynamically resize minibuffer to display entire contents"
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72 :group 'frames)
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73
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74
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75 (defcustom resize-minibuffer-mode nil
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76 "*If non-`nil', resize the minibuffer so its entire contents are visible."
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77 :type 'boolean
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78 :require 'rsz-minibuf
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79 :group 'resize-minibuffer)
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80
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81 (defcustom resize-minibuffer-window-max-height nil
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82 "*Maximum size the minibuffer window is allowed to become.
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83 If less than 1 or not a number, the limit is the height of the frame in
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84 which the active minibuffer window resides."
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85 :type '(choice (const nil) integer)
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86 :group 'resize-minibuffer)
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87
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88 (defcustom resize-minibuffer-window-exactly t
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89 "*If non-`nil', make minibuffer exactly the size needed to display all its contents.
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90 Otherwise, the minibuffer window can temporarily increase in size but
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91 never get smaller while it is active."
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92 :type 'boolean
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93 :group 'resize-minibuffer)
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94
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95
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96 (defcustom resize-minibuffer-frame nil
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97 "*If non-`nil' and the active minibuffer is the sole window in its frame, allow changing the frame height."
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98 :type 'boolean
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99 :group 'resize-minibuffer)
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100
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101 (defcustom resize-minibuffer-frame-max-height nil
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102 "*Maximum size the minibuffer frame is allowed to become.
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103 If less than 1 or not a number, there is no limit.")
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104
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105 (defcustom resize-minibuffer-frame-exactly nil
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106 "*If non-`nil', make minibuffer frame exactly the size needed to display all its contents.
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107 Otherwise, the minibuffer frame can temporarily increase in size but
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108 never get smaller while it is active."
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109 :type 'boolean
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110 :group 'resize-minibuffer)
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111
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112
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113 ;;;###autoload
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114 (defun resize-minibuffer-mode (&optional prefix)
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115 "Enable or disable resize-minibuffer mode.
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116 A negative prefix argument disables this mode. A positive argument or
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117 argument of 0 enables it.
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118
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119 When this minor mode is enabled, the minibuffer is dynamically resized to
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120 contain the entire region of text put in it as you type.
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121
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122 The variable `resize-minibuffer-mode' is set to t or nil depending on
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123 whether this mode is active or not.
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124
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125 The maximum height to which the minibuffer can grow is controlled by the
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126 variable `resize-minibuffer-window-max-height'.
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127
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128 The variable `resize-minibuffer-window-exactly' determines whether the
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129 minibuffer window should ever be shrunk to make it no larger than needed to
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130 display its contents.
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131
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132 When using a window system, it is possible for a minibuffer to be the sole
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133 window in a frame. Since that window is already its maximum size, the only
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134 way to make more text visible at once is to increase the size of the frame.
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135 The variable `resize-minibuffer-frame' controls whether this should be
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136 done. The variables `resize-minibuffer-frame-max-height' and
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137 `resize-minibuffer-frame-exactly' are analogous to their window
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138 counterparts."
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139 (interactive "p")
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140 (or prefix (setq prefix 0))
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141 (cond
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142 ((>= prefix 0)
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143 (setq resize-minibuffer-mode t))
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144 (t
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145 (setq resize-minibuffer-mode nil))))
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146
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147 (defun resize-minibuffer-setup ()
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148 (cond
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149 (resize-minibuffer-mode
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150 (cond
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151 ((and (not (eq 'tty (console-type)))
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152 (eq 'only (plist-get (frame-properties) 'minibuffer)))
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153 (and resize-minibuffer-frame
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154 (progn
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155 (make-local-hook 'minibuffer-exit-hook)
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156 (add-hook 'minibuffer-exit-hook 'resize-minibuffer-frame-restore
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157 nil t)
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158 (make-local-hook 'post-command-hook)
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159 (add-hook 'post-command-hook 'resize-minibuffer-frame nil t)
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160 (unless (and (boundp 'icomplete-mode)
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161 icomplete-mode)
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162 (resize-minibuffer-frame)))))
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163 (t
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164 (make-local-hook 'post-command-hook)
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82
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165 (add-hook 'post-command-hook 'resize-minibuffer-window nil t)
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166 (unless (and (boundp 'icomplete-mode)
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167 icomplete-mode)
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168 (resize-minibuffer-window)))))))
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169
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170 (defun resize-minibuffer-count-window-lines (&optional start end)
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171 "Return number of window lines occupied by text in region.
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172 The number of window lines may be greater than the number of actual lines
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173 in the buffer if any wrap on the display due to their length.
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174
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175 Optional arguments START and END default to point-min and point-max,
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176 respectively."
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177 (or start (setq start (point-min)))
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178 (or end (setq end (point-max)))
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179 (if (= start end)
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180 0
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181 (save-excursion
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182 (save-restriction
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183 (widen)
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184 (narrow-to-region start end)
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185 (goto-char start)
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186 (vertical-motion (buffer-size))))))
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187
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188
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189 ;; Resize the minibuffer window to contain the minibuffer's contents.
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190 ;; The minibuffer must be the current window.
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191 (defun resize-minibuffer-window ()
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192 (let ((height (window-height))
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193 (lines (1+ (resize-minibuffer-count-window-lines))))
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194 (and (numberp resize-minibuffer-window-max-height)
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195 (> resize-minibuffer-window-max-height 0)
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189
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196 (setq lines (min
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197 lines
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198 resize-minibuffer-window-max-height)))
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199 (or (if resize-minibuffer-window-exactly
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200 (= lines height)
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201 (<= lines height))
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202 (enlarge-window (- lines height)))))
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203
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204
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205 ;; Resize the minibuffer frame to contain the minibuffer's contents.
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206 ;; The minibuffer frame must be the current frame.
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207 (defun resize-minibuffer-frame ()
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208 (let ((height (frame-height))
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209 (lines (1+ (resize-minibuffer-count-window-lines))))
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210 (and (numberp resize-minibuffer-frame-max-height)
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211 (> resize-minibuffer-frame-max-height 0)
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189
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212 (setq lines (min
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213 lines
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214 resize-minibuffer-frame-max-height)))
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215 (cond
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216 ((> lines height)
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217 (set-frame-size (selected-frame) (frame-width) lines))
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218 ((and resize-minibuffer-frame-exactly
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219 (> height (plist-get minibuffer-frame-plist 'height))
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220 (< lines height))
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221 (set-frame-size (selected-frame) (frame-width) lines)))))
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222
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223 ;; Restore the original height of the frame.
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224 (defun resize-minibuffer-frame-restore ()
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189
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225 (set-frame-size (selected-frame) (frame-width)
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226 (plist-get minibuffer-frame-plist 'height)))
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227
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228
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229 (provide 'rsz-minibuf)
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230
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231 (add-hook 'minibuffer-setup-hook 'resize-minibuffer-setup)
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232
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233 ;;; rsz-minibuf.el ends here
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