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813f532d RS |
1 | ;;; rsz-mini.el --- dynamically resize minibuffer to display entire contents |
2 | ||
a8a9b70d | 3 | ;; Copyright (C) 1990, 1993, 1994, 1995, 1997 Free Software Foundation, Inc. |
813f532d | 4 | |
2ca4ad7e NF |
5 | ;; Author: Noah Friedman <friedman@prep.ai.mit.edu> |
6 | ;; Roland McGrath <roland@prep.ai.mit.edu> | |
7 | ;; Maintainer: friedman@prep.ai.mit.edu | |
8 | ;; Keywords: minibuffer, window, frame, display | |
813f532d | 9 | |
f9e9ac1d | 10 | ;; $Id: rsz-mini.el,v 1.19 1998/03/23 13:18:54 schwab Exp done $ |
a8a9b70d | 11 | |
813f532d RS |
12 | ;; This file is part of GNU Emacs. |
13 | ||
14 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
15 | ;; it under the terms of the GNU General Public License as published by | |
16 | ;; the Free Software Foundation; either version 2, or (at your option) | |
17 | ;; any later version. | |
18 | ||
19 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
20 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | ;; GNU General Public License for more details. | |
23 | ||
24 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
25 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
26 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
27 | ;; Boston, MA 02111-1307, USA. | |
813f532d RS |
28 | |
29 | ;;; Commentary: | |
30 | ||
2ca4ad7e NF |
31 | ;; This package allows the entire contents (or as much as possible) of the |
32 | ;; minibuffer to be visible at once when typing. As the end of a line is | |
33 | ;; reached, the minibuffer will resize itself. When the user is done | |
34 | ;; typing, the minibuffer will return to its original size. | |
35 | ||
36 | ;; In window systems where it is possible to have a frame in which the | |
4e782c8e RS |
37 | ;; minibuffer is the only window, the frame itself can be resized. In |
38 | ;; Emacs 19.22 and earlier, the frame may not be properly returned to | |
2ca4ad7e NF |
39 | ;; its original size after it ceases to be active because |
40 | ;; `minibuffer-exit-hook' didn't exist until version 19.23. | |
41 | ;; | |
42 | ;; Prior to Emacs 19.26, minibuffer-exit-hook wasn't called after exiting | |
43 | ;; from the minibuffer by hitting the quit char. That meant that the | |
44 | ;; frame size restoration function wasn't being called in that case. In | |
45 | ;; 19.26 or later, minibuffer-exit-hook should be called anyway. | |
46 | ||
47 | ;; Note that the minibuffer and echo area are not the same! They simply | |
48 | ;; happen to occupy roughly the same place on the frame. Messages put in | |
49 | ;; the echo area will not cause any resizing by this package. | |
50 | ||
51 | ;; This package is considered a minor mode but it doesn't put anything in | |
52 | ;; minor-mode-alist because this mode is specific to the minibuffer, which | |
53 | ;; has no mode line. | |
54 | ||
3da6a026 | 55 | ;; To enable or disable this mode, use M-x resize-minibuffer-mode. |
813f532d RS |
56 | |
57 | ;;; Code: | |
58 | ||
59 | \f | |
9e5b444e RS |
60 | (defgroup resize-minibuffer nil |
61 | "Dynamically resize minibuffer to display entire contents" | |
62 | :group 'frames) | |
63 | ||
9e5b444e | 64 | (defcustom resize-minibuffer-mode nil |
6fc7e037 RS |
65 | "*If non-`nil', resize the minibuffer so its entire contents are visible. |
66 | You must modify via \\[customize] for this variable to have an effect." | |
67 | :set (lambda (symbol value) | |
68 | (resize-minibuffer-mode (if value 1 -1))) | |
69 | :initialize 'custom-initialize-default | |
9e5b444e | 70 | :type 'boolean |
6fc7e037 | 71 | :group 'resize-minibuffer |
f9e9ac1d DN |
72 | :require 'rsz-mini |
73 | :version "20.3") | |
813f532d RS |
74 | |
75 | ;;;###autoload | |
9e5b444e | 76 | (defcustom resize-minibuffer-window-max-height nil |
813f532d RS |
77 | "*Maximum size the minibuffer window is allowed to become. |
78 | If less than 1 or not a number, the limit is the height of the frame in | |
9e5b444e RS |
79 | which the active minibuffer window resides." |
80 | :type '(choice (const nil) integer) | |
81 | :group 'resize-minibuffer) | |
813f532d RS |
82 | |
83 | ;;;###autoload | |
9e5b444e | 84 | (defcustom resize-minibuffer-window-exactly t |
cb7217a7 NF |
85 | "*Allow making minibuffer exactly the size to display all its contents. |
86 | If `nil', the minibuffer window can temporarily increase in size but | |
87 | never get smaller while it is active. Any other value allows exact | |
9e5b444e RS |
88 | resizing." |
89 | :type 'boolean | |
90 | :group 'resize-minibuffer) | |
813f532d | 91 | |
813f532d | 92 | ;;;###autoload |
9e5b444e | 93 | (defcustom resize-minibuffer-frame nil |
cb7217a7 NF |
94 | "*Allow changing the frame height of minibuffer frames. |
95 | If non-`nil' and the active minibuffer is the sole window in its frame, | |
9e5b444e RS |
96 | allow changing the frame height." |
97 | :type 'boolean | |
98 | :group 'resize-minibuffer) | |
813f532d RS |
99 | |
100 | ;;;###autoload | |
9e5b444e | 101 | (defcustom resize-minibuffer-frame-max-height nil |
813f532d RS |
102 | "*Maximum size the minibuffer frame is allowed to become. |
103 | If less than 1 or not a number, there is no limit.") | |
104 | ||
105 | ;;;###autoload | |
9e5b444e | 106 | (defcustom resize-minibuffer-frame-exactly t |
cb7217a7 NF |
107 | "*Allow making minibuffer frame exactly the size to display all its contents. |
108 | If `nil', the minibuffer frame can temporarily increase in size but | |
109 | never get smaller while it is active. Any other value allows exact | |
9e5b444e RS |
110 | resizing." |
111 | :type 'boolean | |
112 | :group 'resize-minibuffer) | |
cb7217a7 NF |
113 | |
114 | ;; Variable used to store the height of the minibuffer frame | |
115 | ;; on entry, so it can be restored on exit. It is made local before it is | |
116 | ;; modified. Do not use it yourself. | |
117 | (defvar resize-minibuffer-frame-original-height nil) | |
813f532d RS |
118 | |
119 | \f | |
120 | ;;;###autoload | |
121 | (defun resize-minibuffer-mode (&optional prefix) | |
ecdd2ab5 AS |
122 | "Toggle resize-minibuffer mode. |
123 | With argument, enable resize-minibuffer mode if and only if argument | |
124 | is positive. | |
813f532d RS |
125 | |
126 | When this minor mode is enabled, the minibuffer is dynamically resized to | |
127 | contain the entire region of text put in it as you type. | |
128 | ||
129 | The variable `resize-minibuffer-mode' is set to t or nil depending on | |
130 | whether this mode is active or not. | |
131 | ||
132 | The maximum height to which the minibuffer can grow is controlled by the | |
133 | variable `resize-minibuffer-window-max-height'. | |
134 | ||
135 | The variable `resize-minibuffer-window-exactly' determines whether the | |
136 | minibuffer window should ever be shrunk to make it no larger than needed to | |
137 | display its contents. | |
138 | ||
54059149 | 139 | When using a window system, it is possible for a minibuffer to be the sole |
813f532d RS |
140 | window in a frame. Since that window is already its maximum size, the only |
141 | way to make more text visible at once is to increase the size of the frame. | |
142 | The variable `resize-minibuffer-frame' controls whether this should be | |
143 | done. The variables `resize-minibuffer-frame-max-height' and | |
144 | `resize-minibuffer-frame-exactly' are analogous to their window | |
145 | counterparts." | |
ecdd2ab5 AS |
146 | (interactive "P") |
147 | (setq resize-minibuffer-mode | |
148 | (if prefix | |
149 | (> (prefix-numeric-value prefix) 0) | |
150 | (not resize-minibuffer-mode))) | |
a8a9b70d | 151 | (add-hook 'minibuffer-setup-hook 'resize-minibuffer-setup)) |
813f532d RS |
152 | |
153 | (defun resize-minibuffer-setup () | |
154 | (cond | |
155 | (resize-minibuffer-mode | |
156 | (cond | |
157 | ((and window-system | |
158 | (eq 'only (cdr (assq 'minibuffer (frame-parameters))))) | |
bab863c3 NF |
159 | ;; Checking for resize-minibuffer-frame is done outside the cond |
160 | ;; predicate because that should always be t if this is a minibuffer | |
161 | ;; frame; it just shouldn't do anything if this flag is nil. | |
813f532d RS |
162 | (and resize-minibuffer-frame |
163 | (progn | |
bab863c3 NF |
164 | ;; Can't trust the height stored in minibuffer-frame-alist |
165 | ;; since the frame can be resized by the window manager and | |
166 | ;; that variable isn't updated. | |
cb7217a7 NF |
167 | (make-local-variable 'resize-minibuffer-frame-original-height) |
168 | (setq resize-minibuffer-frame-original-height (frame-height)) | |
bab863c3 | 169 | |
04752ffb RS |
170 | (make-local-hook 'post-command-hook) |
171 | (add-hook 'post-command-hook 'resize-minibuffer-frame 'append t) | |
bab863c3 | 172 | |
04752ffb RS |
173 | (make-local-hook 'minibuffer-exit-hook) |
174 | (add-hook 'minibuffer-exit-hook 'resize-minibuffer-frame-restore | |
175 | nil t) | |
bab863c3 NF |
176 | |
177 | (resize-minibuffer-frame)))) | |
813f532d RS |
178 | (t |
179 | (make-local-variable 'post-command-hook) | |
bab863c3 NF |
180 | ;; Copy this because add-hook modifies the list structure. |
181 | (setq post-command-hook (copy-sequence post-command-hook)) | |
cb7217a7 | 182 | (add-hook 'post-command-hook 'resize-minibuffer-window 'append) |
bab863c3 | 183 | |
cb7217a7 | 184 | (make-local-variable 'minibuffer-exit-hook) |
bab863c3 NF |
185 | (add-hook 'minibuffer-exit-hook 'resize-minibuffer-window-restore) |
186 | ||
187 | (resize-minibuffer-window)))))) | |
813f532d RS |
188 | |
189 | (defun resize-minibuffer-count-window-lines (&optional start end) | |
190 | "Return number of window lines occupied by text in region. | |
191 | The number of window lines may be greater than the number of actual lines | |
192 | in the buffer if any wrap on the display due to their length. | |
193 | ||
194 | Optional arguments START and END default to point-min and point-max, | |
195 | respectively." | |
196 | (or start (setq start (point-min))) | |
197 | (or end (setq end (point-max))) | |
198 | (if (= start end) | |
199 | 0 | |
200 | (save-excursion | |
201 | (save-restriction | |
202 | (widen) | |
203 | (narrow-to-region start end) | |
204 | (goto-char start) | |
205 | (vertical-motion (buffer-size)))))) | |
206 | ||
207 | \f | |
208 | ;; Resize the minibuffer window to contain the minibuffer's contents. | |
813f532d | 209 | (defun resize-minibuffer-window () |
2ca4ad7e NF |
210 | (and (eq (selected-window) (minibuffer-window)) |
211 | (let ((height (window-height)) | |
212 | (lines (1+ (resize-minibuffer-count-window-lines)))) | |
213 | (and (numberp resize-minibuffer-window-max-height) | |
214 | (> resize-minibuffer-window-max-height 0) | |
215 | (setq lines (min lines resize-minibuffer-window-max-height))) | |
216 | (or (if resize-minibuffer-window-exactly | |
217 | (= lines height) | |
218 | (<= lines height)) | |
219 | (enlarge-window (- lines height)))))) | |
813f532d | 220 | |
cb7217a7 NF |
221 | ;; This resizes the minibuffer back to one line as soon as it is exited |
222 | ;; (e.g. when the user hits RET). This way, subsequent messages put in the | |
223 | ;; echo area aren't cluttered with leftover minibuffer text. | |
224 | ;; It should be called by minibuffer-exit-hook. | |
225 | ;; | |
226 | ;; Note that because it calls sit-for to force a screen update, strange | |
227 | ;; things may happen in the minibuffer, such as unexpanded partial | |
228 | ;; completions by complete.el showing their completion. | |
229 | ;; If this bothers you, just redefine this function to do nothing, in, say, | |
230 | ;; your after-load-alist. Perhaps there should be an option variable, | |
231 | ;; but I don't know if there's really any demand for it. | |
232 | ;; (Clobbering this definition is harmless because eventually emacs restores | |
233 | ;; its idea of the minibuffer window size when the minibuffer isn't in use | |
234 | ;; anyway; this is just a kludge because of the timing for that update). | |
235 | (defun resize-minibuffer-window-restore () | |
ee50a528 | 236 | (cond |
2ca4ad7e | 237 | ((not (eq (minibuffer-window) (selected-window)))) |
ee50a528 NF |
238 | ((> (window-height) 1) |
239 | (enlarge-window (- 1 (window-height))) | |
240 | (sit-for 0)))) | |
cb7217a7 | 241 | |
813f532d RS |
242 | \f |
243 | ;; Resize the minibuffer frame to contain the minibuffer's contents. | |
244 | ;; The minibuffer frame must be the current frame. | |
245 | (defun resize-minibuffer-frame () | |
246 | (let ((height (frame-height)) | |
247 | (lines (1+ (resize-minibuffer-count-window-lines)))) | |
248 | (and (numberp resize-minibuffer-frame-max-height) | |
249 | (> resize-minibuffer-frame-max-height 0) | |
250 | (setq lines (min lines resize-minibuffer-frame-max-height))) | |
251 | (cond | |
252 | ((> lines height) | |
c7385664 | 253 | (set-frame-size (window-frame (minibuffer-window)) (frame-width) lines)) |
813f532d | 254 | ((and resize-minibuffer-frame-exactly |
cb7217a7 | 255 | (> height resize-minibuffer-frame-original-height) |
813f532d | 256 | (< lines height)) |
c7385664 KH |
257 | (set-frame-size (window-frame (minibuffer-window)) |
258 | (frame-width) lines))))) | |
813f532d RS |
259 | |
260 | ;; Restore the original height of the frame. | |
cb7217a7 NF |
261 | ;; resize-minibuffer-frame-original-height is set in |
262 | ;; resize-minibuffer-setup. | |
813f532d | 263 | (defun resize-minibuffer-frame-restore () |
06fb1cf2 | 264 | (set-frame-size (window-frame (minibuffer-window)) |
813f532d | 265 | (frame-width) |
cb7217a7 | 266 | resize-minibuffer-frame-original-height)) |
813f532d | 267 | |
6fc7e037 RS |
268 | (if resize-minibuffer-mode |
269 | (resize-minibuffer-mode 1)) | |
270 | ||
813f532d RS |
271 | (provide 'rsz-mini) |
272 | ||
813f532d | 273 | ;; rsz-mini.el ends here |