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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 ;;; 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 ;;; Status: Known to work in FSF GNU Emacs 19.23 and Lucid Emacs 19.9.
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12
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13 ;;; $Id: rsz-minibuf.el,v 1.3 1997/03/09 02:37:22 steve Exp $
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14
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15 ;;; This program is free software; you can redistribute it and/or modify
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16 ;;; it under the terms of the GNU General Public License as published by
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17 ;;; the Free Software Foundation; either version 2, or (at your option)
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18 ;;; any later version.
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19 ;;;
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20 ;;; This program is distributed in the hope that it will be useful,
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21 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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22 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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23 ;;; GNU General Public License for more details.
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24 ;;;
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25 ;;; You should have received a copy of the GNU General Public License
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26 ;;; along with this program; if not, you can either send email to this
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27 ;;; program's maintainer or write to: The Free Software Foundation,
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28 ;;; Inc.; 675 Massachusetts Avenue; Cambridge, MA 02139, USA.
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29
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30 ;;; Commentary:
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31
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32 ;;; This package allows the entire contents (or as much as possible) of the
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33 ;;; minibuffer to be visible at once when typing. As the end of a line is
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34 ;;; reached, the minibuffer will resize itself. When the user is done
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35 ;;; typing, the minibuffer will return to its original size.
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36
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37 ;;; In window systems where it is possible to have a frame in which the
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38 ;;; minibuffer is the only window, the frame itself can be resized. In FSF
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39 ;;; GNU Emacs 19.22 and earlier, the frame may not be properly returned to
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40 ;;; its original size after it ceases to be active because
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41 ;;; `minibuffer-exit-hook' didn't exist until version 19.23.
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42
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43 ;;; NOTE: The code to resize frames has not been tested under Lucid Emacs,
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44 ;;; because detached minibuffers are broken.
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45
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46 ;;; Note that the minibuffer and echo area are not the same! They simply
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47 ;;; happen to occupy roughly the same place on the frame. Messages put in
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48 ;;; the echo area will not cause any resizing by this package.
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49
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50 ;;; This package is considered a minor mode but it doesn't put anything in
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51 ;;; minor-mode-alist because this mode is specific to the minibuffer, which
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52 ;;; has no modeline.
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53
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54 ;;; To use this package, put the following in your .emacs:
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55 ;;;
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56 ;;; (autoload 'resize-minibuffer-mode "rsz-minibuf" nil t)
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57 ;;;
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58 ;;; Invoking the command `resize-minibuffer-mode' will then enable this mode.
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59
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60 ;;; Code:
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61
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62
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63 ;;;###autoload
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64 (defvar resize-minibuffer-mode nil
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65 "*If non-`nil', resize the minibuffer so its entire contents are visible.")
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66
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67 ;;;###autoload
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68 (defvar resize-minibuffer-window-max-height nil
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69 "*Maximum size the minibuffer window is allowed to become.
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70 If less than 1 or not a number, the limit is the height of the frame in
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71 which the active minibuffer window resides.")
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72
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73 ;;;###autoload
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74 (defvar resize-minibuffer-window-exactly t
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75 "*If non-`nil', make minibuffer exactly the size needed to display all its contents.
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76 Otherwise, the minibuffer window can temporarily increase in size but
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77 never get smaller while it is active.")
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78
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79
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80 ;;;###autoload
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81 (defvar resize-minibuffer-frame nil
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82 "*If non-`nil' and the active minibuffer is the sole window in its frame, allow changing the frame height.")
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83
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84 ;;;###autoload
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85 (defvar resize-minibuffer-frame-max-height nil
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86 "*Maximum size the minibuffer frame is allowed to become.
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87 If less than 1 or not a number, there is no limit.")
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88
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89 ;;;###autoload
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90 (defvar resize-minibuffer-frame-exactly nil
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91 "*If non-`nil', make minibuffer frame exactly the size needed to display all its contents.
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92 Otherwise, the minibuffer frame can temporarily increase in size but
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93 never get smaller while it is active.")
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94
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95
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96 ;;;###autoload
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97 (defun resize-minibuffer-mode (&optional prefix)
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98 "Enable or disable resize-minibuffer mode.
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99 A negative prefix argument disables this mode. A positive argument or
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100 argument of 0 enables it.
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101
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102 When this minor mode is enabled, the minibuffer is dynamically resized to
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103 contain the entire region of text put in it as you type.
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104
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105 The variable `resize-minibuffer-mode' is set to t or nil depending on
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106 whether this mode is active or not.
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107
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108 The maximum height to which the minibuffer can grow is controlled by the
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109 variable `resize-minibuffer-window-max-height'.
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110
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111 The variable `resize-minibuffer-window-exactly' determines whether the
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112 minibuffer window should ever be shrunk to make it no larger than needed to
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113 display its contents.
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114
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115 When using a window system, it is possible for a minibuffer to be the sole
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116 window in a frame. Since that window is already its maximum size, the only
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117 way to make more text visible at once is to increase the size of the frame.
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118 The variable `resize-minibuffer-frame' controls whether this should be
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119 done. The variables `resize-minibuffer-frame-max-height' and
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120 `resize-minibuffer-frame-exactly' are analogous to their window
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121 counterparts."
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122 (interactive "p")
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123 (or prefix (setq prefix 0))
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124 (cond
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125 ((>= prefix 0)
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126 (setq resize-minibuffer-mode t))
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127 (t
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128 (setq resize-minibuffer-mode nil))))
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129
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130 ;;; Glue code to make things work in both FSF and Lucid Emacsen.
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131 (if (string-match "Lucid" emacs-version)
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132 (progn
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133 (fset 'resize-frame-parameters 'screen-parameters)
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134 (fset 'resize-frame-height 'screen-height)
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135 (fset 'resize-frame-width 'screen-width)
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136 (fset 'resize-selected-frame 'selected-screen)
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137 (fset 'resize-set-frame-size 'set-screen-size)
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138 (defun resize-minibuffer-frame-alist ()
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139 "Return the frame alist for the minibuffer."
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140 minibuffer-alist))
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141 (fset 'resize-frame-parameters 'frame-parameters)
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142 (fset 'resize-frame-height 'frame-height)
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143 (fset 'resize-frame-width 'frame-width)
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144 (fset 'resize-selected-frame 'selected-frame)
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145 (fset 'resize-set-frame-size 'set-frame-size)
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146 (defun resize-minibuffer-frame-alist ()
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147 "Return the frame alist for the minibuffer."
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148 minibuffer-frame-alist))
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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 (cdr (assq 'minibuffer (resize-frame-parameters)))))
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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 ;; Why isn't `min' a subr?
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192 ;; Do not pretend this is a real definition of `min'. It suffices for this
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193 ;; packages's purposes (and is reasonably fast for a lisp call) but a real
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194 ;; min function would be able to take more than 2 arguments.
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195 (defun resize-minibuffer-min (x y)
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196 "Return the lesser of X or Y."
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197 (if (< x y)
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198 x
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199 y))
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200
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201
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202 ;; Resize the minibuffer window to contain the minibuffer's contents.
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203 ;; The minibuffer must be the current window.
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204 (defun resize-minibuffer-window ()
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205 (let ((height (window-height))
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206 (lines (1+ (resize-minibuffer-count-window-lines))))
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207 (and (numberp resize-minibuffer-window-max-height)
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208 (> resize-minibuffer-window-max-height 0)
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209 (setq lines (resize-minibuffer-min
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210 lines
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211 resize-minibuffer-window-max-height)))
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212 (or (if resize-minibuffer-window-exactly
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213 (= lines height)
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214 (<= lines height))
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215 (enlarge-window (- lines height)))))
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216
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217
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218 ;; Resize the minibuffer frame to contain the minibuffer's contents.
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219 ;; The minibuffer frame must be the current frame.
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220 (defun resize-minibuffer-frame ()
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221 (let ((height (resize-frame-height))
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222 (lines (1+ (resize-minibuffer-count-window-lines))))
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223 (and (numberp resize-minibuffer-frame-max-height)
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224 (> resize-minibuffer-frame-max-height 0)
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225 (setq lines (resize-minibuffer-min
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226 lines
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227 resize-minibuffer-frame-max-height)))
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228 (cond
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229 ((> lines height)
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230 (resize-set-frame-size (resize-selected-frame)
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231 (resize-frame-width)
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232 lines))
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233 ((and resize-minibuffer-frame-exactly
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234 (> height (cdr (assq 'height (resize-minibuffer-frame-alist))))
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235 (< lines height))
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236 (resize-set-frame-size (resize-selected-frame)
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237 (resize-frame-width)
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238 lines)))))
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239
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240 ;; Restore the original height of the frame.
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241 (defun resize-minibuffer-frame-restore ()
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242 (resize-set-frame-size (resize-selected-frame)
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243 (resize-frame-width)
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244 (cdr (assq 'height (resize-minibuffer-frame-alist)))))
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245
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246
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247 (provide 'rsz-minibuf)
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248
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249 (add-hook 'minibuffer-setup-hook 'resize-minibuffer-setup)
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250
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251 ;; rsz-minibuf.el ends here
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