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- ;;; rsz-mini.el --- dynamically resize minibuffer to display entire contents
-
- ;; Copyright (C) 1990, 1993, 1994, 1995 Free Software Foundation, Inc.
-
- ;; Author: Noah Friedman <friedman@prep.ai.mit.edu>
- ;; Roland McGrath <roland@prep.ai.mit.edu>
- ;; Maintainer: friedman@prep.ai.mit.edu
- ;; Keywords: minibuffer, window, frame, display
- ;; Status: Known to work in FSF GNU Emacs 19.26 and later.
- ;; $Id: rsz-mini.el,v 1.11 1996/01/14 07:34:30 erik Exp $
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; This package allows the entire contents (or as much as possible) of the
- ;; minibuffer to be visible at once when typing. As the end of a line is
- ;; reached, the minibuffer will resize itself. When the user is done
- ;; typing, the minibuffer will return to its original size.
-
- ;; In window systems where it is possible to have a frame in which the
- ;; minibuffer is the only window, the frame itself can be resized. In FSF
- ;; GNU Emacs 19.22 and earlier, the frame may not be properly returned to
- ;; its original size after it ceases to be active because
- ;; `minibuffer-exit-hook' didn't exist until version 19.23.
- ;;
- ;; Prior to Emacs 19.26, minibuffer-exit-hook wasn't called after exiting
- ;; from the minibuffer by hitting the quit char. That meant that the
- ;; frame size restoration function wasn't being called in that case. In
- ;; 19.26 or later, minibuffer-exit-hook should be called anyway.
-
- ;; Note that the minibuffer and echo area are not the same! They simply
- ;; happen to occupy roughly the same place on the frame. Messages put in
- ;; the echo area will not cause any resizing by this package.
-
- ;; This package is considered a minor mode but it doesn't put anything in
- ;; minor-mode-alist because this mode is specific to the minibuffer, which
- ;; has no mode line.
-
- ;; To enable or disable this mode, use M-x resize-minibuffer-mode.
-
- ;;; Code:
-
-
- ;;;###autoload
- (defvar resize-minibuffer-mode nil
- "*If non-`nil', resize the minibuffer so its entire contents are visible.")
-
- ;;;###autoload
- (defvar resize-minibuffer-window-max-height nil
- "*Maximum size the minibuffer window is allowed to become.
- If less than 1 or not a number, the limit is the height of the frame in
- which the active minibuffer window resides.")
-
- ;;;###autoload
- (defvar resize-minibuffer-window-exactly t
- "*Allow making minibuffer exactly the size to display all its contents.
- If `nil', the minibuffer window can temporarily increase in size but
- never get smaller while it is active. Any other value allows exact
- resizing.")
-
- ;;;###autoload
- (defvar resize-minibuffer-frame nil
- "*Allow changing the frame height of minibuffer frames.
- If non-`nil' and the active minibuffer is the sole window in its frame,
- allow changing the frame height.")
-
- ;;;###autoload
- (defvar resize-minibuffer-frame-max-height nil
- "*Maximum size the minibuffer frame is allowed to become.
- If less than 1 or not a number, there is no limit.")
-
- ;;;###autoload
- (defvar resize-minibuffer-frame-exactly t
- "*Allow making minibuffer frame exactly the size to display all its contents.
- If `nil', the minibuffer frame can temporarily increase in size but
- never get smaller while it is active. Any other value allows exact
- resizing.")
-
- ;; Variable used to store the height of the minibuffer frame
- ;; on entry, so it can be restored on exit. It is made local before it is
- ;; modified. Do not use it yourself.
- (defvar resize-minibuffer-frame-original-height nil)
-
-
- ;;;###autoload
- (defun resize-minibuffer-mode (&optional prefix)
- "Enable or disable resize-minibuffer mode.
- A negative prefix argument disables this mode. A positive argument or
- argument of 0 enables it.
-
- When this minor mode is enabled, the minibuffer is dynamically resized to
- contain the entire region of text put in it as you type.
-
- The variable `resize-minibuffer-mode' is set to t or nil depending on
- whether this mode is active or not.
-
- The maximum height to which the minibuffer can grow is controlled by the
- variable `resize-minibuffer-window-max-height'.
-
- The variable `resize-minibuffer-window-exactly' determines whether the
- minibuffer window should ever be shrunk to make it no larger than needed to
- display its contents.
-
- When using a window system, it is possible for a minibuffer to be the sole
- window in a frame. Since that window is already its maximum size, the only
- way to make more text visible at once is to increase the size of the frame.
- The variable `resize-minibuffer-frame' controls whether this should be
- done. The variables `resize-minibuffer-frame-max-height' and
- `resize-minibuffer-frame-exactly' are analogous to their window
- counterparts."
- (interactive "p")
- (or prefix (setq prefix 0))
- (cond
- ((>= prefix 0)
- (setq resize-minibuffer-mode t))
- (t
- (setq resize-minibuffer-mode nil))))
-
- (defun resize-minibuffer-setup ()
- (cond
- (resize-minibuffer-mode
- (cond
- ((and window-system
- (eq 'only (cdr (assq 'minibuffer (frame-parameters)))))
- ;; Checking for resize-minibuffer-frame is done outside the cond
- ;; predicate because that should always be t if this is a minibuffer
- ;; frame; it just shouldn't do anything if this flag is nil.
- (and resize-minibuffer-frame
- (progn
- ;; Can't trust the height stored in minibuffer-frame-alist
- ;; since the frame can be resized by the window manager and
- ;; that variable isn't updated.
- (make-local-variable 'resize-minibuffer-frame-original-height)
- (setq resize-minibuffer-frame-original-height (frame-height))
-
- (make-local-hook 'post-command-hook)
- (add-hook 'post-command-hook 'resize-minibuffer-frame 'append t)
-
- (make-local-hook 'minibuffer-exit-hook)
- (add-hook 'minibuffer-exit-hook 'resize-minibuffer-frame-restore
- nil t)
-
- (resize-minibuffer-frame))))
- (t
- (make-local-variable 'post-command-hook)
- ;; Copy this because add-hook modifies the list structure.
- (setq post-command-hook (copy-sequence post-command-hook))
- (add-hook 'post-command-hook 'resize-minibuffer-window 'append)
-
- (make-local-variable 'minibuffer-exit-hook)
- (add-hook 'minibuffer-exit-hook 'resize-minibuffer-window-restore)
-
- (resize-minibuffer-window))))))
-
- (defun resize-minibuffer-count-window-lines (&optional start end)
- "Return number of window lines occupied by text in region.
- The number of window lines may be greater than the number of actual lines
- in the buffer if any wrap on the display due to their length.
-
- Optional arguments START and END default to point-min and point-max,
- respectively."
- (or start (setq start (point-min)))
- (or end (setq end (point-max)))
- (if (= start end)
- 0
- (save-excursion
- (save-restriction
- (widen)
- (narrow-to-region start end)
- (goto-char start)
- (vertical-motion (buffer-size))))))
-
-
- ;; Resize the minibuffer window to contain the minibuffer's contents.
- (defun resize-minibuffer-window ()
- (and (eq (selected-window) (minibuffer-window))
- (let ((height (window-height))
- (lines (1+ (resize-minibuffer-count-window-lines))))
- (and (numberp resize-minibuffer-window-max-height)
- (> resize-minibuffer-window-max-height 0)
- (setq lines (min lines resize-minibuffer-window-max-height)))
- (or (if resize-minibuffer-window-exactly
- (= lines height)
- (<= lines height))
- (enlarge-window (- lines height))))))
-
- ;; This resizes the minibuffer back to one line as soon as it is exited
- ;; (e.g. when the user hits RET). This way, subsequent messages put in the
- ;; echo area aren't cluttered with leftover minibuffer text.
- ;; It should be called by minibuffer-exit-hook.
- ;;
- ;; Note that because it calls sit-for to force a screen update, strange
- ;; things may happen in the minibuffer, such as unexpanded partial
- ;; completions by complete.el showing their completion.
- ;; If this bothers you, just redefine this function to do nothing, in, say,
- ;; your after-load-alist. Perhaps there should be an option variable,
- ;; but I don't know if there's really any demand for it.
- ;; (Clobbering this definition is harmless because eventually emacs restores
- ;; its idea of the minibuffer window size when the minibuffer isn't in use
- ;; anyway; this is just a kludge because of the timing for that update).
- (defun resize-minibuffer-window-restore ()
- (cond
- ((not (eq (minibuffer-window) (selected-window))))
- ((> (window-height) 1)
- (enlarge-window (- 1 (window-height)))
- (sit-for 0))))
-
-
- ;; Resize the minibuffer frame to contain the minibuffer's contents.
- ;; The minibuffer frame must be the current frame.
- (defun resize-minibuffer-frame ()
- (let ((height (frame-height))
- (lines (1+ (resize-minibuffer-count-window-lines))))
- (and (numberp resize-minibuffer-frame-max-height)
- (> resize-minibuffer-frame-max-height 0)
- (setq lines (min lines resize-minibuffer-frame-max-height)))
- (cond
- ((> lines height)
- (set-frame-size (selected-frame) (frame-width) lines))
- ((and resize-minibuffer-frame-exactly
- (> height resize-minibuffer-frame-original-height)
- (< lines height))
- (set-frame-size (selected-frame) (frame-width) lines)))))
-
- ;; Restore the original height of the frame.
- ;; resize-minibuffer-frame-original-height is set in
- ;; resize-minibuffer-setup.
- (defun resize-minibuffer-frame-restore ()
- (set-frame-size (selected-frame)
- (frame-width)
- resize-minibuffer-frame-original-height))
-
-
- (provide 'rsz-mini)
-
- (add-hook 'minibuffer-setup-hook 'resize-minibuffer-setup)
- (resize-minibuffer-mode)
-
- ;; rsz-mini.el ends here
-