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3756 lines
123 KiB
EmacsLisp
3756 lines
123 KiB
EmacsLisp
;;; wid-edit.el --- Functions for creating and using widgets -*-byte-compile-dynamic: t;-*-
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;;
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;; Copyright (C) 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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;; 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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;;
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;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
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;; Maintainer: FSF
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;; Keywords: extensions
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Wishlist items (from widget.texi):
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;; * The `menu-choice' tag should be prettier, something like the
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;; abbreviated menus in Open Look.
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;; * Finish `:tab-order'.
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;; * Make indentation work with glyphs and proportional fonts.
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;; * Add commands to show overview of object and class hierarchies to
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;; the browser.
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;; * Find a way to disable mouse highlight for inactive widgets.
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;; * Find a way to make glyphs look inactive.
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;; * Add `key-binding' widget.
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;; * Add `widget' widget for editing widget specifications.
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;; * Find clean way to implement variable length list. See
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;; `TeX-printer-list' for an explanation.
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;; * `C-h' in `widget-prompt-value' should give type specific help.
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;; * A mailto widget. [This should work OK as a url-link if with
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;; browse-url-browser-function' set up appropriately.]
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;;; Commentary:
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;;
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;; See `widget.el'.
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;;; Code:
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(defvar widget)
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;;; Compatibility.
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(defun widget-event-point (event)
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"Character position of the end of event if that exists, or nil."
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(posn-point (event-end event)))
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(defun widget-button-release-event-p (event)
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"Non-nil if EVENT is a mouse-button-release event object."
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(and (eventp event)
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(memq (event-basic-type event) '(mouse-1 mouse-2 mouse-3))
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(or (memq 'click (event-modifiers event))
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(memq 'drag (event-modifiers event)))))
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;;; Customization.
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(defgroup widgets nil
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"Customization support for the Widget Library."
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:link '(custom-manual "(widget)Top")
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:link '(emacs-library-link :tag "Lisp File" "widget.el")
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:prefix "widget-"
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:group 'extensions
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:group 'hypermedia)
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(defgroup widget-documentation nil
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"Options controlling the display of documentation strings."
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:group 'widgets)
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(defgroup widget-faces nil
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"Faces used by the widget library."
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:group 'widgets
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:group 'faces)
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(defvar widget-documentation-face 'widget-documentation
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"Face used for documentation strings in widgets.
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This exists as a variable so it can be set locally in certain buffers.")
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(defface widget-documentation '((((class color)
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(background dark))
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(:foreground "lime green"))
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(((class color)
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(background light))
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(:foreground "dark green"))
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(t nil))
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"Face used for documentation text."
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:group 'widget-documentation
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:group 'widget-faces)
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(define-obsolete-face-alias 'widget-documentation-face
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'widget-documentation "22.1")
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(defvar widget-button-face 'widget-button
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"Face used for buttons in widgets.
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This exists as a variable so it can be set locally in certain buffers.")
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(defface widget-button '((t (:weight bold)))
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"Face used for widget buttons."
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:group 'widget-faces)
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(define-obsolete-face-alias 'widget-button-face 'widget-button "22.1")
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(defcustom widget-mouse-face 'highlight
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"Face used for widget buttons when the mouse is above them."
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:type 'face
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:group 'widget-faces)
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;; TTY gets special definitions here and in the next defface, because
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;; the gray colors defined for other displays cause black text on a black
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;; background, at least on light-background TTYs.
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(defface widget-field '((((type tty))
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:background "yellow3"
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:foreground "black")
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(((class grayscale color)
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(background light))
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:background "gray85")
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(((class grayscale color)
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(background dark))
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:background "dim gray")
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(t
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:slant italic))
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"Face used for editable fields."
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:group 'widget-faces)
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(define-obsolete-face-alias 'widget-field-face 'widget-field "22.1")
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(defface widget-single-line-field '((((type tty))
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:background "green3"
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:foreground "black")
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(((class grayscale color)
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(background light))
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:background "gray85")
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(((class grayscale color)
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(background dark))
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:background "dim gray")
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(t
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:slant italic))
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"Face used for editable fields spanning only a single line."
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:group 'widget-faces)
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(define-obsolete-face-alias 'widget-single-line-field-face
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'widget-single-line-field "22.1")
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;;; This causes display-table to be loaded, and not usefully.
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;;;(defvar widget-single-line-display-table
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;;; (let ((table (make-display-table)))
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;;; (aset table 9 "^I")
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;;; (aset table 10 "^J")
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;;; table)
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;;; "Display table used for single-line editable fields.")
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;;;(when (fboundp 'set-face-display-table)
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;;; (set-face-display-table 'widget-single-line-field-face
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;;; widget-single-line-display-table))
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;;; Utility functions.
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;;
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;; These are not really widget specific.
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(defun widget-princ-to-string (object)
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"Return string representation of OBJECT, any Lisp object.
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No quoting characters are used; no delimiters are printed around
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the contents of strings."
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(with-output-to-string
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(princ object)))
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(defun widget-clear-undo ()
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"Clear all undo information."
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(buffer-disable-undo (current-buffer))
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(buffer-enable-undo))
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(defcustom widget-menu-max-size 40
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"Largest number of items allowed in a popup-menu.
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Larger menus are read through the minibuffer."
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:group 'widgets
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:type 'integer)
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(defcustom widget-menu-max-shortcuts 40
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"Largest number of items for which it works to choose one with a character.
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For a larger number of items, the minibuffer is used."
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:group 'widgets
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:type 'integer)
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(defcustom widget-menu-minibuffer-flag nil
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"Control how to ask for a choice from the keyboard.
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Non-nil means use the minibuffer;
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nil means read a single character."
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:group 'widgets
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:type 'boolean)
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(defun widget-choose (title items &optional event)
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"Choose an item from a list.
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First argument TITLE is the name of the list.
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Second argument ITEMS is a list whose members are either
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(NAME . VALUE), to indicate selectable items, or just strings to
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indicate unselectable items.
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Optional third argument EVENT is an input event.
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The user is asked to choose between each NAME from the items alist,
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and the VALUE of the chosen element will be returned. If EVENT is a
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mouse event, and the number of elements in items is less than
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`widget-menu-max-size', a popup menu will be used, otherwise the
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minibuffer."
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(cond ((and (< (length items) widget-menu-max-size)
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event (display-popup-menus-p))
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;; Mouse click.
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(x-popup-menu event
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(list title (cons "" items))))
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((or widget-menu-minibuffer-flag
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(> (length items) widget-menu-max-shortcuts))
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;; Read the choice of name from the minibuffer.
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(setq items (widget-remove-if 'stringp items))
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(let ((val (completing-read (concat title ": ") items nil t)))
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(if (stringp val)
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(let ((try (try-completion val items)))
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(when (stringp try)
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(setq val try))
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(cdr (assoc val items))))))
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(t
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;; Construct a menu of the choices
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;; and then use it for prompting for a single character.
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(let* ((overriding-terminal-local-map (make-sparse-keymap))
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(next-digit ?0)
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map choice some-choice-enabled value)
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;; Define SPC as a prefix char to get to this menu.
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(define-key overriding-terminal-local-map " "
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(setq map (make-sparse-keymap title)))
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(with-current-buffer (get-buffer-create " widget-choose")
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(erase-buffer)
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(insert "Available choices:\n\n")
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(while items
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(setq choice (car items) items (cdr items))
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(if (consp choice)
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(let* ((name (car choice))
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(function (cdr choice)))
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(insert (format "%c = %s\n" next-digit name))
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(define-key map (vector next-digit) function)
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(setq some-choice-enabled t)))
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;; Allocate digits to disabled alternatives
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;; so that the digit of a given alternative never varies.
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(setq next-digit (1+ next-digit)))
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(insert "\nC-g = Quit"))
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(or some-choice-enabled
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(error "None of the choices is currently meaningful"))
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(define-key map [?\C-g] 'keyboard-quit)
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(define-key map [t] 'keyboard-quit)
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(define-key map [?\M-\C-v] 'scroll-other-window)
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(define-key map [?\M--] 'negative-argument)
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(setcdr map (nreverse (cdr map)))
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;; Read a char with the menu, and return the result
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;; that corresponds to it.
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(save-window-excursion
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(let ((buf (get-buffer " widget-choose")))
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(fit-window-to-buffer (display-buffer buf))
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(let ((cursor-in-echo-area t)
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keys
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(char 0)
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(arg 1))
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(while (not (or (and (integerp char)
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(>= char ?0) (< char next-digit))
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(eq value 'keyboard-quit)))
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;; Unread a SPC to lead to our new menu.
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(setq unread-command-events (cons ?\s unread-command-events))
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(setq keys (read-key-sequence title))
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(setq value
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(lookup-key overriding-terminal-local-map keys t)
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char (aref keys 1))
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(cond ((eq value 'scroll-other-window)
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(let ((minibuffer-scroll-window
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(get-buffer-window buf)))
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(if (> 0 arg)
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(scroll-other-window-down
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(window-height minibuffer-scroll-window))
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(scroll-other-window))
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(setq arg 1)))
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((eq value 'negative-argument)
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(setq arg -1))
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(t
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(setq arg 1)))))))
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(when (eq value 'keyboard-quit)
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(error "Canceled"))
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value))))
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(defun widget-remove-if (predictate list)
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(let (result (tail list))
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(while tail
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(or (funcall predictate (car tail))
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(setq result (cons (car tail) result)))
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(setq tail (cdr tail)))
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(nreverse result)))
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;;; Widget text specifications.
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;;
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;; These functions are for specifying text properties.
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;; We can set it to nil now that get_local_map uses get_pos_property.
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(defconst widget-field-add-space nil
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"Non-nil means add extra space at the end of editable text fields.
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If you don't add the space, it will become impossible to edit a zero
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size field.")
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(defvar widget-field-use-before-change t
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"Non-nil means use `before-change-functions' to track editable fields.
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This enables the use of undo, but doesn't work on Emacs 19.34 and earlier.
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Using before hooks also means that the :notify function can't know the
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new value.")
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(defun widget-specify-field (widget from to)
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"Specify editable button for WIDGET between FROM and TO."
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;; Terminating space is not part of the field, but necessary in
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;; order for local-map to work. Remove next sexp if local-map works
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;; at the end of the overlay.
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(save-excursion
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(goto-char to)
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(cond ((null (widget-get widget :size))
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(forward-char 1))
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(widget-field-add-space
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(insert-and-inherit " ")))
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(setq to (point)))
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(let ((keymap (widget-get widget :keymap))
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(face (or (widget-get widget :value-face) 'widget-field))
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(help-echo (widget-get widget :help-echo))
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(follow-link (widget-get widget :follow-link))
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(rear-sticky
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(or (not widget-field-add-space) (widget-get widget :size))))
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(if (functionp help-echo)
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(setq help-echo 'widget-mouse-help))
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(when (= (char-before to) ?\n)
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;; When the last character in the field is a newline, we want to
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;; give it a `field' char-property of `boundary', which helps the
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;; C-n/C-p act more naturally when entering/leaving the field. We
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;; do this by making a small secondary overlay to contain just that
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;; one character.
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(let ((overlay (make-overlay (1- to) to nil t nil)))
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(overlay-put overlay 'field 'boundary)
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;; We need the real field for tabbing.
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(overlay-put overlay 'real-field widget)
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;; Use `local-map' here, not `keymap', so that normal editing
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;; works in the field when, say, Custom uses `suppress-keymap'.
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(overlay-put overlay 'local-map keymap)
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(overlay-put overlay 'face face)
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(overlay-put overlay 'follow-link follow-link)
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(overlay-put overlay 'help-echo help-echo))
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(setq to (1- to))
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(setq rear-sticky t))
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(let ((overlay (make-overlay from to nil nil rear-sticky)))
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(widget-put widget :field-overlay overlay)
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;;(overlay-put overlay 'detachable nil)
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(overlay-put overlay 'field widget)
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(overlay-put overlay 'local-map keymap)
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(overlay-put overlay 'face face)
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(overlay-put overlay 'follow-link follow-link)
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(overlay-put overlay 'help-echo help-echo)))
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(widget-specify-secret widget))
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(defun widget-specify-secret (field)
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"Replace text in FIELD with value of `:secret', if non-nil."
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(let ((secret (widget-get field :secret))
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(size (widget-get field :size)))
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(when secret
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(let ((begin (widget-field-start field))
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(end (widget-field-end field)))
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(when size
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(while (and (> end begin)
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(eq (char-after (1- end)) ?\s))
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(setq end (1- end))))
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(while (< begin end)
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(let ((old (char-after begin)))
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(unless (eq old secret)
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(subst-char-in-region begin (1+ begin) old secret)
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(put-text-property begin (1+ begin) 'secret old))
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(setq begin (1+ begin))))))))
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(defun widget-specify-button (widget from to)
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"Specify button for WIDGET between FROM and TO."
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(let ((overlay (make-overlay from to nil t nil))
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(follow-link (widget-get widget :follow-link))
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(help-echo (widget-get widget :help-echo)))
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(widget-put widget :button-overlay overlay)
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(if (functionp help-echo)
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(setq help-echo 'widget-mouse-help))
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(overlay-put overlay 'button widget)
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(overlay-put overlay 'keymap (widget-get widget :keymap))
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(overlay-put overlay 'evaporate t)
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;; We want to avoid the face with image buttons.
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(unless (widget-get widget :suppress-face)
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(overlay-put overlay 'face (widget-apply widget :button-face-get))
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(overlay-put overlay 'mouse-face
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;; Make new list structure for the mouse-face value
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;; so that different widgets will have
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;; different `mouse-face' property values
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;; and will highlight separately.
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(let ((mouse-face-value
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(widget-apply widget :mouse-face-get)))
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;; If it's a list, copy it.
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(if (listp mouse-face-value)
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(copy-sequence mouse-face-value)
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;; If it's a symbol, put it in a list.
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(list mouse-face-value)))))
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(overlay-put overlay 'pointer 'hand)
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(overlay-put overlay 'follow-link follow-link)
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(overlay-put overlay 'help-echo help-echo)))
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(defun widget-mouse-help (window overlay point)
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"Help-echo callback for widgets whose :help-echo is a function."
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(with-current-buffer (overlay-buffer overlay)
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(let* ((widget (widget-at (overlay-start overlay)))
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(help-echo (if widget (widget-get widget :help-echo))))
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(if (functionp help-echo)
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(funcall help-echo widget)
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help-echo))))
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(defun widget-specify-sample (widget from to)
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"Specify sample for WIDGET between FROM and TO."
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(let ((overlay (make-overlay from to nil t nil)))
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(overlay-put overlay 'face (widget-apply widget :sample-face-get))
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(overlay-put overlay 'evaporate t)
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(widget-put widget :sample-overlay overlay)))
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(defun widget-specify-doc (widget from to)
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"Specify documentation for WIDGET between FROM and TO."
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(let ((overlay (make-overlay from to nil t nil)))
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(overlay-put overlay 'widget-doc widget)
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(overlay-put overlay 'face widget-documentation-face)
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(overlay-put overlay 'evaporate t)
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(widget-put widget :doc-overlay overlay)))
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(defmacro widget-specify-insert (&rest form)
|
||
"Execute FORM without inheriting any text properties."
|
||
`(save-restriction
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(let ((inhibit-read-only t)
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(inhibit-modification-hooks t))
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||
(narrow-to-region (point) (point))
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(prog1 (progn ,@form)
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(goto-char (point-max))))))
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(defface widget-inactive
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'((t :inherit shadow))
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"Face used for inactive widgets."
|
||
:group 'widget-faces)
|
||
(define-obsolete-face-alias 'widget-inactive-face
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'widget-inactive "22.1")
|
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|
||
(defun widget-specify-inactive (widget from to)
|
||
"Make WIDGET inactive for user modifications."
|
||
(unless (widget-get widget :inactive)
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(let ((overlay (make-overlay from to nil t nil)))
|
||
(overlay-put overlay 'face 'widget-inactive)
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||
;; This is disabled, as it makes the mouse cursor change shape.
|
||
;; (overlay-put overlay 'mouse-face 'widget-inactive)
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||
(overlay-put overlay 'evaporate t)
|
||
(overlay-put overlay 'priority 100)
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||
(overlay-put overlay 'modification-hooks '(widget-overlay-inactive))
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||
(widget-put widget :inactive overlay))))
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||
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||
(defun widget-overlay-inactive (&rest junk)
|
||
"Ignoring the arguments, signal an error."
|
||
(unless inhibit-read-only
|
||
(error "The widget here is not active")))
|
||
|
||
|
||
(defun widget-specify-active (widget)
|
||
"Make WIDGET active for user modifications."
|
||
(let ((inactive (widget-get widget :inactive)))
|
||
(when inactive
|
||
(delete-overlay inactive)
|
||
(widget-put widget :inactive nil))))
|
||
|
||
;;; Widget Properties.
|
||
|
||
(defsubst widget-type (widget)
|
||
"Return the type of WIDGET. The type is a symbol."
|
||
(car widget))
|
||
|
||
;;;###autoload
|
||
(defun widgetp (widget)
|
||
"Return non-nil if WIDGET is a widget."
|
||
(if (symbolp widget)
|
||
(get widget 'widget-type)
|
||
(and (consp widget)
|
||
(symbolp (car widget))
|
||
(get (car widget) 'widget-type))))
|
||
|
||
(defun widget-get-indirect (widget property)
|
||
"In WIDGET, get the value of PROPERTY.
|
||
If the value is a symbol, return its binding.
|
||
Otherwise, just return the value."
|
||
(let ((value (widget-get widget property)))
|
||
(if (symbolp value)
|
||
(symbol-value value)
|
||
value)))
|
||
|
||
(defun widget-member (widget property)
|
||
"Non-nil if there is a definition in WIDGET for PROPERTY."
|
||
(cond ((plist-member (cdr widget) property)
|
||
t)
|
||
((car widget)
|
||
(widget-member (get (car widget) 'widget-type) property))
|
||
(t nil)))
|
||
|
||
(defun widget-value (widget)
|
||
"Extract the current value of WIDGET."
|
||
(widget-apply widget
|
||
:value-to-external (widget-apply widget :value-get)))
|
||
|
||
(defun widget-value-set (widget value)
|
||
"Set the current value of WIDGET to VALUE."
|
||
(widget-apply widget
|
||
:value-set (widget-apply widget
|
||
:value-to-internal value)))
|
||
|
||
(defun widget-default-get (widget)
|
||
"Extract the default external value of WIDGET."
|
||
(widget-apply widget :value-to-external
|
||
(or (widget-get widget :value)
|
||
(widget-apply widget :default-get))))
|
||
|
||
(defun widget-match-inline (widget vals)
|
||
"In WIDGET, match the start of VALS."
|
||
(cond ((widget-get widget :inline)
|
||
(widget-apply widget :match-inline vals))
|
||
((and (listp vals)
|
||
(widget-apply widget :match (car vals)))
|
||
(cons (list (car vals)) (cdr vals)))
|
||
(t nil)))
|
||
|
||
(defun widget-apply-action (widget &optional event)
|
||
"Apply :action in WIDGET in response to EVENT."
|
||
(if (widget-apply widget :active)
|
||
(widget-apply widget :action event)
|
||
(error "Attempt to perform action on inactive widget")))
|
||
|
||
;;; Helper functions.
|
||
;;
|
||
;; These are widget specific.
|
||
|
||
;;;###autoload
|
||
(defun widget-prompt-value (widget prompt &optional value unbound)
|
||
"Prompt for a value matching WIDGET, using PROMPT.
|
||
The current value is assumed to be VALUE, unless UNBOUND is non-nil."
|
||
(unless (listp widget)
|
||
(setq widget (list widget)))
|
||
(setq prompt (format "[%s] %s" (widget-type widget) prompt))
|
||
(setq widget (widget-convert widget))
|
||
(let ((answer (widget-apply widget :prompt-value prompt value unbound)))
|
||
(unless (widget-apply widget :match answer)
|
||
(error "Value does not match %S type" (car widget)))
|
||
answer))
|
||
|
||
(defun widget-get-sibling (widget)
|
||
"Get the item WIDGET is assumed to toggle.
|
||
This is only meaningful for radio buttons or checkboxes in a list."
|
||
(let* ((children (widget-get (widget-get widget :parent) :children))
|
||
child)
|
||
(catch 'child
|
||
(while children
|
||
(setq child (car children)
|
||
children (cdr children))
|
||
(when (eq (widget-get child :button) widget)
|
||
(throw 'child child)))
|
||
nil)))
|
||
|
||
(defun widget-map-buttons (function &optional buffer maparg)
|
||
"Map FUNCTION over the buttons in BUFFER.
|
||
FUNCTION is called with the arguments WIDGET and MAPARG.
|
||
|
||
If FUNCTION returns non-nil, the walk is cancelled.
|
||
|
||
The arguments MAPARG, and BUFFER default to nil and (current-buffer),
|
||
respectively."
|
||
(let ((cur (point-min))
|
||
(widget nil)
|
||
(overlays (if buffer
|
||
(with-current-buffer buffer (overlay-lists))
|
||
(overlay-lists))))
|
||
(setq overlays (append (car overlays) (cdr overlays)))
|
||
(while (setq cur (pop overlays))
|
||
(setq widget (overlay-get cur 'button))
|
||
(if (and widget (funcall function widget maparg))
|
||
(setq overlays nil)))))
|
||
|
||
;;; Images.
|
||
|
||
(defcustom widget-image-directory (file-name-as-directory
|
||
(expand-file-name "images/custom" data-directory))
|
||
"Where widget button images are located.
|
||
If this variable is nil, widget will try to locate the directory
|
||
automatically."
|
||
:group 'widgets
|
||
:type 'directory)
|
||
|
||
(defcustom widget-image-enable t
|
||
"If non-nil, use image buttons in widgets when available."
|
||
:version "21.1"
|
||
:group 'widgets
|
||
:type 'boolean)
|
||
|
||
(defcustom widget-image-conversion
|
||
'((xpm ".xpm") (gif ".gif") (png ".png") (jpeg ".jpg" ".jpeg")
|
||
(xbm ".xbm"))
|
||
"Conversion alist from image formats to file name suffixes."
|
||
:group 'widgets
|
||
:type '(repeat (cons :format "%v"
|
||
(symbol :tag "Image Format" unknown)
|
||
(repeat :tag "Suffixes"
|
||
(string :format "%v")))))
|
||
|
||
(defun widget-image-find (image)
|
||
"Create a graphical button from IMAGE.
|
||
IMAGE should either already be an image, or be a file name sans
|
||
extension (xpm, xbm, gif, jpg, or png) located in
|
||
`widget-image-directory' or otherwise where `find-image' will find it."
|
||
(cond ((not (and image widget-image-enable (display-graphic-p)))
|
||
;; We don't want or can't use images.
|
||
nil)
|
||
((and (consp image)
|
||
(eq 'image (car image)))
|
||
;; Already an image spec. Use it.
|
||
image)
|
||
((stringp image)
|
||
;; A string. Look it up in relevant directories.
|
||
(let* ((load-path (cons widget-image-directory load-path))
|
||
specs)
|
||
(dolist (elt widget-image-conversion)
|
||
(dolist (ext (cdr elt))
|
||
(push (list :type (car elt) :file (concat image ext)) specs)))
|
||
(setq specs (nreverse specs))
|
||
(find-image specs)))
|
||
(t
|
||
;; Oh well.
|
||
nil)))
|
||
|
||
(defvar widget-button-pressed-face 'widget-button-pressed
|
||
"Face used for pressed buttons in widgets.
|
||
This exists as a variable so it can be set locally in certain
|
||
buffers.")
|
||
|
||
(defun widget-image-insert (widget tag image &optional down inactive)
|
||
"In WIDGET, insert the text TAG or, if supported, IMAGE.
|
||
IMAGE should either be an image or an image file name sans extension
|
||
\(xpm, xbm, gif, jpg, or png) located in `widget-image-directory'.
|
||
|
||
Optional arguments DOWN and INACTIVE are used instead of IMAGE when the
|
||
button is pressed or inactive, respectively. These are currently ignored."
|
||
(if (and (display-graphic-p)
|
||
(setq image (widget-image-find image)))
|
||
(progn (widget-put widget :suppress-face t)
|
||
(insert-image image tag))
|
||
(insert tag)))
|
||
|
||
(defun widget-move-and-invoke (event)
|
||
"Move to where you click, and if it is an active field, invoke it."
|
||
(interactive "e")
|
||
(mouse-set-point event)
|
||
(let ((pos (widget-event-point event)))
|
||
(if (and pos (get-char-property pos 'button))
|
||
(widget-button-click event))))
|
||
|
||
;;; Buttons.
|
||
|
||
(defgroup widget-button nil
|
||
"The look of various kinds of buttons."
|
||
:group 'widgets)
|
||
|
||
(defcustom widget-button-prefix ""
|
||
"String used as prefix for buttons."
|
||
:type 'string
|
||
:group 'widget-button)
|
||
|
||
(defcustom widget-button-suffix ""
|
||
"String used as suffix for buttons."
|
||
:type 'string
|
||
:group 'widget-button)
|
||
|
||
;;; Creating Widgets.
|
||
|
||
;;;###autoload
|
||
(defun widget-create (type &rest args)
|
||
"Create widget of TYPE.
|
||
The optional ARGS are additional keyword arguments."
|
||
(let ((widget (apply 'widget-convert type args)))
|
||
(widget-apply widget :create)
|
||
widget))
|
||
|
||
(defun widget-create-child-and-convert (parent type &rest args)
|
||
"As part of the widget PARENT, create a child widget TYPE.
|
||
The child is converted, using the keyword arguments ARGS."
|
||
(let ((widget (apply 'widget-convert type args)))
|
||
(widget-put widget :parent parent)
|
||
(unless (widget-get widget :indent)
|
||
(widget-put widget :indent (+ (or (widget-get parent :indent) 0)
|
||
(or (widget-get widget :extra-offset) 0)
|
||
(widget-get parent :offset))))
|
||
(widget-apply widget :create)
|
||
widget))
|
||
|
||
(defun widget-create-child (parent type)
|
||
"Create widget of TYPE."
|
||
(let ((widget (widget-copy type)))
|
||
(widget-put widget :parent parent)
|
||
(unless (widget-get widget :indent)
|
||
(widget-put widget :indent (+ (or (widget-get parent :indent) 0)
|
||
(or (widget-get widget :extra-offset) 0)
|
||
(widget-get parent :offset))))
|
||
(widget-apply widget :create)
|
||
widget))
|
||
|
||
(defun widget-create-child-value (parent type value)
|
||
"Create widget of TYPE with value VALUE."
|
||
(let ((widget (widget-copy type)))
|
||
(widget-put widget :value (widget-apply widget :value-to-internal value))
|
||
(widget-put widget :parent parent)
|
||
(unless (widget-get widget :indent)
|
||
(widget-put widget :indent (+ (or (widget-get parent :indent) 0)
|
||
(or (widget-get widget :extra-offset) 0)
|
||
(widget-get parent :offset))))
|
||
(widget-apply widget :create)
|
||
widget))
|
||
|
||
;;;###autoload
|
||
(defun widget-delete (widget)
|
||
"Delete WIDGET."
|
||
(widget-apply widget :delete))
|
||
|
||
(defun widget-copy (widget)
|
||
"Make a deep copy of WIDGET."
|
||
(widget-apply (copy-sequence widget) :copy))
|
||
|
||
(defun widget-convert (type &rest args)
|
||
"Convert TYPE to a widget without inserting it in the buffer.
|
||
The optional ARGS are additional keyword arguments."
|
||
;; Don't touch the type.
|
||
(let* ((widget (if (symbolp type)
|
||
(list type)
|
||
(copy-sequence type)))
|
||
(current widget)
|
||
done
|
||
(keys args))
|
||
;; First set the :args keyword.
|
||
(while (cdr current) ;Look in the type.
|
||
(if (and (keywordp (cadr current))
|
||
;; If the last element is a keyword,
|
||
;; it is still the :args element,
|
||
;; even though it is a keyword.
|
||
(cddr current))
|
||
(if (eq (cadr current) :args)
|
||
;; If :args is explicitly specified, obey it.
|
||
(setq current nil)
|
||
;; Some other irrelevant keyword.
|
||
(setq current (cdr (cdr current))))
|
||
(setcdr current (list :args (cdr current)))
|
||
(setq current nil)))
|
||
(while (and args (not done)) ;Look in ARGS.
|
||
(cond ((eq (car args) :args)
|
||
;; Handle explicit specification of :args.
|
||
(setq args (cadr args)
|
||
done t))
|
||
((keywordp (car args))
|
||
(setq args (cddr args)))
|
||
(t (setq done t))))
|
||
(when done
|
||
(widget-put widget :args args))
|
||
;; Then Convert the widget.
|
||
(setq type widget)
|
||
(while type
|
||
(let ((convert-widget (plist-get (cdr type) :convert-widget)))
|
||
(if convert-widget
|
||
(setq widget (funcall convert-widget widget))))
|
||
(setq type (get (car type) 'widget-type)))
|
||
;; Finally set the keyword args.
|
||
(while keys
|
||
(let ((next (nth 0 keys)))
|
||
(if (keywordp next)
|
||
(progn
|
||
(widget-put widget next (nth 1 keys))
|
||
(setq keys (nthcdr 2 keys)))
|
||
(setq keys nil))))
|
||
;; Convert the :value to internal format.
|
||
(if (widget-member widget :value)
|
||
(widget-put widget
|
||
:value (widget-apply widget
|
||
:value-to-internal
|
||
(widget-get widget :value))))
|
||
;; Return the newly create widget.
|
||
widget))
|
||
|
||
;;;###autoload
|
||
(defun widget-insert (&rest args)
|
||
"Call `insert' with ARGS even if surrounding text is read only."
|
||
(let ((inhibit-read-only t)
|
||
(inhibit-modification-hooks t))
|
||
(apply 'insert args)))
|
||
|
||
(defun widget-convert-text (type from to
|
||
&optional button-from button-to
|
||
&rest args)
|
||
"Return a widget of type TYPE with endpoint FROM TO.
|
||
No text will be inserted to the buffer, instead the text between FROM
|
||
and TO will be used as the widgets end points. If optional arguments
|
||
BUTTON-FROM and BUTTON-TO are given, these will be used as the widgets
|
||
button end points.
|
||
Optional ARGS are extra keyword arguments for TYPE."
|
||
(let ((widget (apply 'widget-convert type :delete 'widget-leave-text args))
|
||
(from (copy-marker from))
|
||
(to (copy-marker to)))
|
||
(set-marker-insertion-type from t)
|
||
(set-marker-insertion-type to nil)
|
||
(widget-put widget :from from)
|
||
(widget-put widget :to to)
|
||
(when button-from
|
||
(widget-specify-button widget button-from button-to))
|
||
widget))
|
||
|
||
(defun widget-convert-button (type from to &rest args)
|
||
"Return a widget of type TYPE with endpoint FROM TO.
|
||
Optional ARGS are extra keyword arguments for TYPE.
|
||
No text will be inserted to the buffer, instead the text between FROM
|
||
and TO will be used as the widgets end points, as well as the widgets
|
||
button end points."
|
||
(apply 'widget-convert-text type from to from to args))
|
||
|
||
(defun widget-leave-text (widget)
|
||
"Remove markers and overlays from WIDGET and its children."
|
||
(let ((button (widget-get widget :button-overlay))
|
||
(sample (widget-get widget :sample-overlay))
|
||
(doc (widget-get widget :doc-overlay))
|
||
(field (widget-get widget :field-overlay)))
|
||
(set-marker (widget-get widget :from) nil)
|
||
(set-marker (widget-get widget :to) nil)
|
||
(when button
|
||
(delete-overlay button))
|
||
(when sample
|
||
(delete-overlay sample))
|
||
(when doc
|
||
(delete-overlay doc))
|
||
(when field
|
||
(delete-overlay field))
|
||
(mapc 'widget-leave-text (widget-get widget :children))))
|
||
|
||
;;; Keymap and Commands.
|
||
|
||
;; This alias exists only so that one can choose in doc-strings (e.g.
|
||
;; Custom-mode) which key-binding of widget-keymap one wants to refer to.
|
||
;; http://lists.gnu.org/archive/html/emacs-devel/2008-11/msg00480.html
|
||
(define-obsolete-function-alias 'advertised-widget-backward
|
||
'widget-backward "23.2")
|
||
|
||
;;;###autoload
|
||
(defvar widget-keymap
|
||
(let ((map (make-sparse-keymap)))
|
||
(define-key map "\t" 'widget-forward)
|
||
(define-key map "\e\t" 'widget-backward)
|
||
(define-key map [(shift tab)] 'widget-backward)
|
||
(put 'widget-backward :advertised-binding [(shift tab)])
|
||
(define-key map [backtab] 'widget-backward)
|
||
(define-key map [down-mouse-2] 'widget-button-click)
|
||
(define-key map [down-mouse-1] 'widget-button-click)
|
||
;; The following definition needs to avoid using escape sequences that
|
||
;; might get converted to ^M when building loaddefs.el
|
||
(define-key map [(control ?m)] 'widget-button-press)
|
||
map)
|
||
"Keymap containing useful binding for buffers containing widgets.
|
||
Recommended as a parent keymap for modes using widgets.
|
||
Note that such modes will need to require wid-edit.")
|
||
|
||
(defvar widget-global-map global-map
|
||
"Keymap used for events a widget does not handle itself.")
|
||
(make-variable-buffer-local 'widget-global-map)
|
||
|
||
(defvar widget-field-keymap
|
||
(let ((map (copy-keymap widget-keymap)))
|
||
(define-key map "\C-k" 'widget-kill-line)
|
||
(define-key map "\M-\t" 'widget-complete)
|
||
(define-key map "\C-m" 'widget-field-activate)
|
||
;; Since the widget code uses a `field' property to identify fields,
|
||
;; ordinary beginning-of-line does the right thing.
|
||
;; (define-key map "\C-a" 'widget-beginning-of-line)
|
||
(define-key map "\C-e" 'widget-end-of-line)
|
||
map)
|
||
"Keymap used inside an editable field.")
|
||
|
||
(defvar widget-text-keymap
|
||
(let ((map (copy-keymap widget-keymap)))
|
||
;; Since the widget code uses a `field' property to identify fields,
|
||
;; ordinary beginning-of-line does the right thing.
|
||
;; (define-key map "\C-a" 'widget-beginning-of-line)
|
||
(define-key map "\C-e" 'widget-end-of-line)
|
||
map)
|
||
"Keymap used inside a text field.")
|
||
|
||
(defun widget-field-activate (pos &optional event)
|
||
"Invoke the editable field at point."
|
||
(interactive "@d")
|
||
(let ((field (widget-field-at pos)))
|
||
(if field
|
||
(widget-apply-action field event)
|
||
(call-interactively
|
||
(lookup-key widget-global-map (this-command-keys))))))
|
||
|
||
(defface widget-button-pressed
|
||
'((((min-colors 88) (class color))
|
||
(:foreground "red1"))
|
||
(((class color))
|
||
(:foreground "red"))
|
||
(t
|
||
(:weight bold :underline t)))
|
||
"Face used for pressed buttons."
|
||
:group 'widget-faces)
|
||
(define-obsolete-face-alias 'widget-button-pressed-face
|
||
'widget-button-pressed "22.1")
|
||
|
||
(defvar widget-button-click-moves-point nil
|
||
"If non-nil, `widget-button-click' moves point to a button after invoking it.
|
||
If nil, point returns to its original position after invoking a button.")
|
||
|
||
(defun widget-button-click (event)
|
||
"Invoke the button that the mouse is pointing at."
|
||
(interactive "e")
|
||
(if (widget-event-point event)
|
||
(let* ((oevent event)
|
||
(mouse-1 (memq (event-basic-type event) '(mouse-1 down-mouse-1)))
|
||
(pos (widget-event-point event))
|
||
(start (event-start event))
|
||
(button (get-char-property
|
||
pos 'button (and (windowp (posn-window start))
|
||
(window-buffer (posn-window start)))))
|
||
newpoint)
|
||
(when (or (null button)
|
||
(catch 'button-press-cancelled
|
||
;; Mouse click on a widget button. Do the following
|
||
;; in a save-excursion so that the click on the button
|
||
;; doesn't change point.
|
||
(save-selected-window
|
||
(select-window (posn-window (event-start event)))
|
||
(save-excursion
|
||
(goto-char (posn-point (event-start event)))
|
||
(let* ((overlay (widget-get button :button-overlay))
|
||
(pressed-face (or (widget-get button :pressed-face)
|
||
widget-button-pressed-face))
|
||
(face (overlay-get overlay 'face))
|
||
(mouse-face (overlay-get overlay 'mouse-face)))
|
||
(unwind-protect
|
||
;; Read events, including mouse-movement
|
||
;; events, waiting for a release event. If we
|
||
;; began with a mouse-1 event and receive a
|
||
;; movement event, that means the user wants
|
||
;; to perform drag-selection, so cancel the
|
||
;; button press and do the default mouse-1
|
||
;; action. For mouse-2, just highlight/
|
||
;; unhighlight the button the mouse was
|
||
;; initially on when we move over it.
|
||
(save-excursion
|
||
(when face ; avoid changing around image
|
||
(overlay-put overlay 'face pressed-face)
|
||
(overlay-put overlay 'mouse-face pressed-face))
|
||
(unless (widget-apply button :mouse-down-action event)
|
||
(let ((track-mouse t))
|
||
(while (not (widget-button-release-event-p event))
|
||
(setq event (read-event))
|
||
(when (and mouse-1 (mouse-movement-p event))
|
||
(push event unread-command-events)
|
||
(setq event oevent)
|
||
(throw 'button-press-cancelled t))
|
||
(unless (or (integerp event)
|
||
(memq (car event) '(switch-frame select-window))
|
||
(eq (car event) 'scroll-bar-movement))
|
||
(setq pos (widget-event-point event))
|
||
(if (and pos
|
||
(eq (get-char-property pos 'button)
|
||
button))
|
||
(when face
|
||
(overlay-put overlay 'face pressed-face)
|
||
(overlay-put overlay 'mouse-face pressed-face))
|
||
(overlay-put overlay 'face face)
|
||
(overlay-put overlay 'mouse-face mouse-face))))))
|
||
|
||
;; When mouse is released over the button, run
|
||
;; its action function.
|
||
(when (and pos (eq (get-char-property pos 'button) button))
|
||
(goto-char pos)
|
||
(widget-apply-action button event)
|
||
(if widget-button-click-moves-point
|
||
(setq newpoint (point)))))
|
||
(overlay-put overlay 'face face)
|
||
(overlay-put overlay 'mouse-face mouse-face))))
|
||
|
||
(if newpoint (goto-char newpoint))
|
||
;; This loses if the widget action switches windows. -- cyd
|
||
;; (unless (pos-visible-in-window-p (widget-event-point event))
|
||
;; (mouse-set-point event)
|
||
;; (beginning-of-line)
|
||
;; (recenter))
|
||
)
|
||
nil))
|
||
(let ((up t) command)
|
||
;; Mouse click not on a widget button. Find the global
|
||
;; command to run, and check whether it is bound to an
|
||
;; up event.
|
||
(if mouse-1
|
||
(cond ((setq command ;down event
|
||
(lookup-key widget-global-map [down-mouse-1]))
|
||
(setq up nil))
|
||
((setq command ;up event
|
||
(lookup-key widget-global-map [mouse-1]))))
|
||
(cond ((setq command ;down event
|
||
(lookup-key widget-global-map [down-mouse-2]))
|
||
(setq up nil))
|
||
((setq command ;up event
|
||
(lookup-key widget-global-map [mouse-2])))))
|
||
(when up
|
||
;; Don't execute up events twice.
|
||
(while (not (widget-button-release-event-p event))
|
||
(setq event (read-event))))
|
||
(when command
|
||
(call-interactively command)))))
|
||
(message "You clicked somewhere weird.")))
|
||
|
||
(defun widget-button-press (pos &optional event)
|
||
"Invoke button at POS."
|
||
(interactive "@d")
|
||
(let ((button (get-char-property pos 'button)))
|
||
(if button
|
||
(widget-apply-action button event)
|
||
(let ((command (lookup-key widget-global-map (this-command-keys))))
|
||
(when (commandp command)
|
||
(call-interactively command))))))
|
||
|
||
(defun widget-tabable-at (&optional pos)
|
||
"Return the tabable widget at POS, or nil.
|
||
POS defaults to the value of (point)."
|
||
(let ((widget (widget-at pos)))
|
||
(if widget
|
||
(let ((order (widget-get widget :tab-order)))
|
||
(if order
|
||
(if (>= order 0)
|
||
widget)
|
||
widget)))))
|
||
|
||
(defvar widget-use-overlay-change t
|
||
"If non-nil, use overlay change functions to tab around in the buffer.
|
||
This is much faster, but doesn't work reliably on Emacs 19.34.")
|
||
|
||
(defun widget-move (arg)
|
||
"Move point to the ARG next field or button.
|
||
ARG may be negative to move backward."
|
||
(or (bobp) (> arg 0) (backward-char))
|
||
(let ((wrapped 0)
|
||
(number arg)
|
||
(old (widget-tabable-at)))
|
||
;; Forward.
|
||
(while (> arg 0)
|
||
(cond ((eobp)
|
||
(goto-char (point-min))
|
||
(setq wrapped (1+ wrapped)))
|
||
(widget-use-overlay-change
|
||
(goto-char (next-overlay-change (point))))
|
||
(t
|
||
(forward-char 1)))
|
||
(and (= wrapped 2)
|
||
(eq arg number)
|
||
(error "No buttons or fields found"))
|
||
(let ((new (widget-tabable-at)))
|
||
(when new
|
||
(unless (eq new old)
|
||
(setq arg (1- arg))
|
||
(setq old new)))))
|
||
;; Backward.
|
||
(while (< arg 0)
|
||
(cond ((bobp)
|
||
(goto-char (point-max))
|
||
(setq wrapped (1+ wrapped)))
|
||
(widget-use-overlay-change
|
||
(goto-char (previous-overlay-change (point))))
|
||
(t
|
||
(backward-char 1)))
|
||
(and (= wrapped 2)
|
||
(eq arg number)
|
||
(error "No buttons or fields found"))
|
||
(let ((new (widget-tabable-at)))
|
||
(when new
|
||
(unless (eq new old)
|
||
(setq arg (1+ arg))))))
|
||
(let ((new (widget-tabable-at)))
|
||
(while (eq (widget-tabable-at) new)
|
||
(backward-char)))
|
||
(forward-char))
|
||
(widget-echo-help (point))
|
||
(run-hooks 'widget-move-hook))
|
||
|
||
(defun widget-forward (arg)
|
||
"Move point to the next field or button.
|
||
With optional ARG, move across that many fields."
|
||
(interactive "p")
|
||
(run-hooks 'widget-forward-hook)
|
||
(widget-move arg))
|
||
|
||
(defun widget-backward (arg)
|
||
"Move point to the previous field or button.
|
||
With optional ARG, move across that many fields."
|
||
(interactive "p")
|
||
(run-hooks 'widget-backward-hook)
|
||
(widget-move (- arg)))
|
||
|
||
;; Since the widget code uses a `field' property to identify fields,
|
||
;; ordinary beginning-of-line does the right thing.
|
||
(defalias 'widget-beginning-of-line 'beginning-of-line)
|
||
|
||
(defun widget-end-of-line ()
|
||
"Go to end of field or end of line, whichever is first.
|
||
Trailing spaces at the end of padded fields are not considered part of
|
||
the field."
|
||
(interactive)
|
||
;; Ordinary end-of-line does the right thing, because we're inside
|
||
;; text with a `field' property.
|
||
(end-of-line)
|
||
(unless (eolp)
|
||
;; ... except that we want to ignore trailing spaces in fields that
|
||
;; aren't terminated by a newline, because they are used as padding,
|
||
;; and ignored when extracting the entered value of the field.
|
||
(skip-chars-backward " " (field-beginning (1- (point))))))
|
||
|
||
(defun widget-kill-line ()
|
||
"Kill to end of field or end of line, whichever is first."
|
||
(interactive)
|
||
(let* ((field (widget-field-find (point)))
|
||
(end (and field (widget-field-end field))))
|
||
(if (and field (> (line-beginning-position 2) end))
|
||
(kill-region (point) end)
|
||
(call-interactively 'kill-line))))
|
||
|
||
(defcustom widget-complete-field (lookup-key global-map "\M-\t")
|
||
"Default function to call for completion inside fields."
|
||
:options '(ispell-complete-word complete-tag lisp-complete-symbol)
|
||
:type 'function
|
||
:group 'widgets)
|
||
|
||
(defun widget-narrow-to-field ()
|
||
"Narrow to field."
|
||
(interactive)
|
||
(let ((field (widget-field-find (point))))
|
||
(if field
|
||
(narrow-to-region (line-beginning-position) (line-end-position)))))
|
||
|
||
;; This used to say:
|
||
;; "When not inside a field, move to the previous button or field."
|
||
;; but AFAICS, it has always just thrown an error.
|
||
(defun widget-complete ()
|
||
"Complete content of editable field from point.
|
||
When not inside a field, signal an error."
|
||
(interactive)
|
||
(let ((field (widget-field-find (point))))
|
||
(if field
|
||
(widget-apply field :complete)
|
||
(error "Not in an editable field"))))
|
||
|
||
;;; Setting up the buffer.
|
||
|
||
(defvar widget-field-new nil
|
||
"List of all newly created editable fields in the buffer.")
|
||
(make-variable-buffer-local 'widget-field-new)
|
||
|
||
(defvar widget-field-list nil
|
||
"List of all editable fields in the buffer.")
|
||
(make-variable-buffer-local 'widget-field-list)
|
||
|
||
(defun widget-at (&optional pos)
|
||
"The button or field at POS (default, point)."
|
||
(or (get-char-property (or pos (point)) 'button)
|
||
(widget-field-at pos)))
|
||
|
||
;;;###autoload
|
||
(defun widget-setup ()
|
||
"Setup current buffer so editing string widgets works."
|
||
(let ((inhibit-read-only t)
|
||
(inhibit-modification-hooks t)
|
||
field)
|
||
(while widget-field-new
|
||
(setq field (car widget-field-new)
|
||
widget-field-new (cdr widget-field-new)
|
||
widget-field-list (cons field widget-field-list))
|
||
(let ((from (car (widget-get field :field-overlay)))
|
||
(to (cdr (widget-get field :field-overlay))))
|
||
(widget-specify-field field
|
||
(marker-position from) (marker-position to))
|
||
(set-marker from nil)
|
||
(set-marker to nil))))
|
||
(widget-clear-undo)
|
||
(widget-add-change))
|
||
|
||
(defvar widget-field-last nil)
|
||
;; Last field containing point.
|
||
(make-variable-buffer-local 'widget-field-last)
|
||
|
||
(defvar widget-field-was nil)
|
||
;; The widget data before the change.
|
||
(make-variable-buffer-local 'widget-field-was)
|
||
|
||
(defun widget-field-at (pos)
|
||
"Return the widget field at POS, or nil if none."
|
||
(let ((field (get-char-property (or pos (point)) 'field)))
|
||
(if (eq field 'boundary)
|
||
(get-char-property (or pos (point)) 'real-field)
|
||
field)))
|
||
|
||
(defun widget-field-buffer (widget)
|
||
"Return the buffer of WIDGET's editing field."
|
||
(let ((overlay (widget-get widget :field-overlay)))
|
||
(cond ((overlayp overlay)
|
||
(overlay-buffer overlay))
|
||
((consp overlay)
|
||
(marker-buffer (car overlay))))))
|
||
|
||
(defun widget-field-start (widget)
|
||
"Return the start of WIDGET's editing field."
|
||
(let ((overlay (widget-get widget :field-overlay)))
|
||
(if (overlayp overlay)
|
||
(overlay-start overlay)
|
||
(car overlay))))
|
||
|
||
(defun widget-field-end (widget)
|
||
"Return the end of WIDGET's editing field."
|
||
(let ((overlay (widget-get widget :field-overlay)))
|
||
;; Don't subtract one if local-map works at the end of the overlay,
|
||
;; or if a special `boundary' field has been added after the widget
|
||
;; field.
|
||
(if (overlayp overlay)
|
||
;; Don't proceed if overlay has been removed from buffer.
|
||
(when (overlay-buffer overlay)
|
||
(if (and (not (eq (with-current-buffer
|
||
(widget-field-buffer widget)
|
||
(save-restriction
|
||
;; `widget-narrow-to-field' can be
|
||
;; active when this function is called
|
||
;; from an change-functions hook. So
|
||
;; temporarily remove field narrowing
|
||
;; before to call `get-char-property'.
|
||
(widen)
|
||
(get-char-property (overlay-end overlay)
|
||
'field)))
|
||
'boundary))
|
||
(or widget-field-add-space
|
||
(null (widget-get widget :size))))
|
||
(1- (overlay-end overlay))
|
||
(overlay-end overlay)))
|
||
(cdr overlay))))
|
||
|
||
(defun widget-field-text-end (widget)
|
||
(let ((to (widget-field-end widget))
|
||
(size (widget-get widget :size)))
|
||
(if (or (null size) (zerop size))
|
||
to
|
||
(let ((from (widget-field-start widget)))
|
||
(if (and from to)
|
||
(with-current-buffer (widget-field-buffer widget)
|
||
(while (and (> to from)
|
||
(eq (char-after (1- to)) ?\s))
|
||
(setq to (1- to)))
|
||
to))))))
|
||
|
||
(defun widget-field-find (pos)
|
||
"Return the field at POS.
|
||
Unlike (get-char-property POS 'field), this works with empty fields too."
|
||
(let ((fields widget-field-list)
|
||
field found)
|
||
(while fields
|
||
(setq field (car fields)
|
||
fields (cdr fields))
|
||
(when (and (<= (widget-field-start field) pos)
|
||
(<= pos (widget-field-end field)))
|
||
(when found
|
||
(error "Overlapping fields"))
|
||
(setq found field)))
|
||
found))
|
||
|
||
(defun widget-before-change (from to)
|
||
;; This is how, for example, a variable changes its state to `modified'.
|
||
;; when it is being edited.
|
||
(unless inhibit-read-only
|
||
(let ((from-field (widget-field-find from))
|
||
(to-field (widget-field-find to)))
|
||
(cond ((not (eq from-field to-field))
|
||
(add-hook 'post-command-hook 'widget-add-change nil t)
|
||
(signal 'text-read-only
|
||
'("Change should be restricted to a single field")))
|
||
((null from-field)
|
||
(add-hook 'post-command-hook 'widget-add-change nil t)
|
||
(signal 'text-read-only
|
||
'("Attempt to change text outside editable field")))
|
||
(widget-field-use-before-change
|
||
(widget-apply from-field :notify from-field))))))
|
||
|
||
(defun widget-add-change ()
|
||
(remove-hook 'post-command-hook 'widget-add-change t)
|
||
(add-hook 'before-change-functions 'widget-before-change nil t)
|
||
(add-hook 'after-change-functions 'widget-after-change nil t))
|
||
|
||
(defun widget-after-change (from to old)
|
||
"Adjust field size and text properties."
|
||
(let ((field (widget-field-find from))
|
||
(other (widget-field-find to)))
|
||
(when field
|
||
(unless (eq field other)
|
||
(error "Change in different fields"))
|
||
(let ((size (widget-get field :size)))
|
||
(when size
|
||
(let ((begin (widget-field-start field))
|
||
(end (widget-field-end field)))
|
||
(cond ((< (- end begin) size)
|
||
;; Field too small.
|
||
(save-excursion
|
||
(goto-char end)
|
||
(insert-char ?\s (- (+ begin size) end))))
|
||
((> (- end begin) size)
|
||
;; Field too large and
|
||
(if (or (< (point) (+ begin size))
|
||
(> (point) end))
|
||
;; Point is outside extra space.
|
||
(setq begin (+ begin size))
|
||
;; Point is within the extra space.
|
||
(setq begin (point)))
|
||
(save-excursion
|
||
(goto-char end)
|
||
(while (and (eq (preceding-char) ?\s)
|
||
(> (point) begin))
|
||
(delete-backward-char 1)))))))
|
||
(widget-specify-secret field))
|
||
(widget-apply field :notify field))))
|
||
|
||
;;; Widget Functions
|
||
;;
|
||
;; These functions are used in the definition of multiple widgets.
|
||
|
||
(defun widget-parent-action (widget &optional event)
|
||
"Tell :parent of WIDGET to handle the :action.
|
||
Optional EVENT is the event that triggered the action."
|
||
(widget-apply (widget-get widget :parent) :action event))
|
||
|
||
(defun widget-children-value-delete (widget)
|
||
"Delete all :children and :buttons in WIDGET."
|
||
(mapc 'widget-delete (widget-get widget :children))
|
||
(widget-put widget :children nil)
|
||
(mapc 'widget-delete (widget-get widget :buttons))
|
||
(widget-put widget :buttons nil))
|
||
|
||
(defun widget-children-validate (widget)
|
||
"All the :children must be valid."
|
||
(let ((children (widget-get widget :children))
|
||
child found)
|
||
(while (and children (not found))
|
||
(setq child (car children)
|
||
children (cdr children)
|
||
found (widget-apply child :validate)))
|
||
found))
|
||
|
||
(defun widget-child-value-get (widget)
|
||
"Get the value of the first member of :children in WIDGET."
|
||
(widget-value (car (widget-get widget :children))))
|
||
|
||
(defun widget-child-value-inline (widget)
|
||
"Get the inline value of the first member of :children in WIDGET."
|
||
(widget-apply (car (widget-get widget :children)) :value-inline))
|
||
|
||
(defun widget-child-validate (widget)
|
||
"The result of validating the first member of :children in WIDGET."
|
||
(widget-apply (car (widget-get widget :children)) :validate))
|
||
|
||
(defun widget-type-value-create (widget)
|
||
"Convert and instantiate the value of the :type attribute of WIDGET.
|
||
Store the newly created widget in the :children attribute.
|
||
|
||
The value of the :type attribute should be an unconverted widget type."
|
||
(let ((value (widget-get widget :value))
|
||
(type (widget-get widget :type)))
|
||
(widget-put widget :children
|
||
(list (widget-create-child-value widget
|
||
(widget-convert type)
|
||
value)))))
|
||
|
||
(defun widget-type-default-get (widget)
|
||
"Get default value from the :type attribute of WIDGET.
|
||
|
||
The value of the :type attribute should be an unconverted widget type."
|
||
(widget-default-get (widget-convert (widget-get widget :type))))
|
||
|
||
(defun widget-type-match (widget value)
|
||
"Non-nil if the :type value of WIDGET matches VALUE.
|
||
|
||
The value of the :type attribute should be an unconverted widget type."
|
||
(widget-apply (widget-convert (widget-get widget :type)) :match value))
|
||
|
||
(defun widget-types-copy (widget)
|
||
"Copy :args as widget types in WIDGET."
|
||
(widget-put widget :args (mapcar 'widget-copy (widget-get widget :args)))
|
||
widget)
|
||
|
||
;; Made defsubst to speed up face editor creation.
|
||
(defsubst widget-types-convert-widget (widget)
|
||
"Convert :args as widget types in WIDGET."
|
||
(widget-put widget :args (mapcar 'widget-convert (widget-get widget :args)))
|
||
widget)
|
||
|
||
(defun widget-value-convert-widget (widget)
|
||
"Initialize :value from :args in WIDGET."
|
||
(let ((args (widget-get widget :args)))
|
||
(when args
|
||
(widget-put widget :value (car args))
|
||
;; Don't convert :value here, as this is done in `widget-convert'.
|
||
;; (widget-put widget :value (widget-apply widget
|
||
;; :value-to-internal (car args)))
|
||
(widget-put widget :args nil)))
|
||
widget)
|
||
|
||
(defun widget-value-value-get (widget)
|
||
"Return the :value property of WIDGET."
|
||
(widget-get widget :value))
|
||
|
||
;;; The `default' Widget.
|
||
|
||
(define-widget 'default nil
|
||
"Basic widget other widgets are derived from."
|
||
:value-to-internal (lambda (widget value) value)
|
||
:value-to-external (lambda (widget value) value)
|
||
:button-prefix 'widget-button-prefix
|
||
:button-suffix 'widget-button-suffix
|
||
:complete 'widget-default-complete
|
||
:create 'widget-default-create
|
||
:indent nil
|
||
:offset 0
|
||
:format-handler 'widget-default-format-handler
|
||
:button-face-get 'widget-default-button-face-get
|
||
:mouse-face-get 'widget-default-mouse-face-get
|
||
:sample-face-get 'widget-default-sample-face-get
|
||
:delete 'widget-default-delete
|
||
:copy 'identity
|
||
:value-set 'widget-default-value-set
|
||
:value-inline 'widget-default-value-inline
|
||
:value-delete 'ignore
|
||
:default-get 'widget-default-default-get
|
||
:menu-tag-get 'widget-default-menu-tag-get
|
||
:validate #'ignore
|
||
:active 'widget-default-active
|
||
:activate 'widget-specify-active
|
||
:deactivate 'widget-default-deactivate
|
||
:mouse-down-action #'ignore
|
||
:action 'widget-default-action
|
||
:notify 'widget-default-notify
|
||
:prompt-value 'widget-default-prompt-value)
|
||
|
||
(defun widget-default-complete (widget)
|
||
"Call the value of the :complete-function property of WIDGET.
|
||
If that does not exist, call the value of `widget-complete-field'."
|
||
(call-interactively (or (widget-get widget :complete-function)
|
||
widget-complete-field)))
|
||
|
||
(defun widget-default-create (widget)
|
||
"Create WIDGET at point in the current buffer."
|
||
(widget-specify-insert
|
||
(let ((from (point))
|
||
button-begin button-end
|
||
sample-begin sample-end
|
||
doc-begin doc-end
|
||
value-pos)
|
||
(insert (widget-get widget :format))
|
||
(goto-char from)
|
||
;; Parse escapes in format.
|
||
(while (re-search-forward "%\\(.\\)" nil t)
|
||
(let ((escape (char-after (match-beginning 1))))
|
||
(delete-backward-char 2)
|
||
(cond ((eq escape ?%)
|
||
(insert ?%))
|
||
((eq escape ?\[)
|
||
(setq button-begin (point))
|
||
(insert (widget-get-indirect widget :button-prefix)))
|
||
((eq escape ?\])
|
||
(insert (widget-get-indirect widget :button-suffix))
|
||
(setq button-end (point)))
|
||
((eq escape ?\{)
|
||
(setq sample-begin (point)))
|
||
((eq escape ?\})
|
||
(setq sample-end (point)))
|
||
((eq escape ?n)
|
||
(when (widget-get widget :indent)
|
||
(insert ?\n)
|
||
(insert-char ?\s (widget-get widget :indent))))
|
||
((eq escape ?t)
|
||
(let ((image (widget-get widget :tag-glyph))
|
||
(tag (widget-get widget :tag)))
|
||
(cond (image
|
||
(widget-image-insert widget (or tag "image") image))
|
||
(tag
|
||
(insert tag))
|
||
(t
|
||
(princ (widget-get widget :value)
|
||
(current-buffer))))))
|
||
((eq escape ?d)
|
||
(let ((doc (widget-get widget :doc)))
|
||
(when doc
|
||
(setq doc-begin (point))
|
||
(insert doc)
|
||
(while (eq (preceding-char) ?\n)
|
||
(delete-backward-char 1))
|
||
(insert ?\n)
|
||
(setq doc-end (point)))))
|
||
((eq escape ?h)
|
||
(widget-add-documentation-string-button widget))
|
||
((eq escape ?v)
|
||
(if (and button-begin (not button-end))
|
||
(widget-apply widget :value-create)
|
||
(setq value-pos (point))))
|
||
(t
|
||
(widget-apply widget :format-handler escape)))))
|
||
;; Specify button, sample, and doc, and insert value.
|
||
(and button-begin button-end
|
||
(widget-specify-button widget button-begin button-end))
|
||
(and sample-begin sample-end
|
||
(widget-specify-sample widget sample-begin sample-end))
|
||
(and doc-begin doc-end
|
||
(widget-specify-doc widget doc-begin doc-end))
|
||
(when value-pos
|
||
(goto-char value-pos)
|
||
(widget-apply widget :value-create)))
|
||
(let ((from (point-min-marker))
|
||
(to (point-max-marker)))
|
||
(set-marker-insertion-type from t)
|
||
(set-marker-insertion-type to nil)
|
||
(widget-put widget :from from)
|
||
(widget-put widget :to to)))
|
||
(widget-clear-undo))
|
||
|
||
(defun widget-default-format-handler (widget escape)
|
||
(error "Unknown escape `%c'" escape))
|
||
|
||
(defun widget-default-button-face-get (widget)
|
||
;; Use :button-face or widget-button-face
|
||
(or (widget-get widget :button-face)
|
||
(let ((parent (widget-get widget :parent)))
|
||
(if parent
|
||
(widget-apply parent :button-face-get)
|
||
widget-button-face))))
|
||
|
||
(defun widget-default-mouse-face-get (widget)
|
||
;; Use :mouse-face or widget-mouse-face
|
||
(or (widget-get widget :mouse-face)
|
||
(let ((parent (widget-get widget :parent)))
|
||
(if parent
|
||
(widget-apply parent :mouse-face-get)
|
||
widget-mouse-face))))
|
||
|
||
(defun widget-default-sample-face-get (widget)
|
||
;; Use :sample-face.
|
||
(widget-get widget :sample-face))
|
||
|
||
(defun widget-default-delete (widget)
|
||
"Remove widget from the buffer."
|
||
(let ((from (widget-get widget :from))
|
||
(to (widget-get widget :to))
|
||
(inactive-overlay (widget-get widget :inactive))
|
||
(button-overlay (widget-get widget :button-overlay))
|
||
(sample-overlay (widget-get widget :sample-overlay))
|
||
(doc-overlay (widget-get widget :doc-overlay))
|
||
(inhibit-modification-hooks t)
|
||
(inhibit-read-only t))
|
||
(widget-apply widget :value-delete)
|
||
(widget-children-value-delete widget)
|
||
(when inactive-overlay
|
||
(delete-overlay inactive-overlay))
|
||
(when button-overlay
|
||
(delete-overlay button-overlay))
|
||
(when sample-overlay
|
||
(delete-overlay sample-overlay))
|
||
(when doc-overlay
|
||
(delete-overlay doc-overlay))
|
||
(when (< from to)
|
||
;; Kludge: this doesn't need to be true for empty formats.
|
||
(delete-region from to))
|
||
(set-marker from nil)
|
||
(set-marker to nil))
|
||
(widget-clear-undo))
|
||
|
||
(defun widget-default-value-set (widget value)
|
||
"Recreate widget with new value."
|
||
(let* ((old-pos (point))
|
||
(from (copy-marker (widget-get widget :from)))
|
||
(to (copy-marker (widget-get widget :to)))
|
||
(offset (if (and (<= from old-pos) (<= old-pos to))
|
||
(if (>= old-pos (1- to))
|
||
(- old-pos to 1)
|
||
(- old-pos from)))))
|
||
;;??? Bug: this ought to insert the new value before deleting the old one,
|
||
;; so that markers on either side of the value automatically
|
||
;; stay on the same side. -- rms.
|
||
(save-excursion
|
||
(goto-char (widget-get widget :from))
|
||
(widget-apply widget :delete)
|
||
(widget-put widget :value value)
|
||
(widget-apply widget :create))
|
||
(if offset
|
||
(if (< offset 0)
|
||
(goto-char (+ (widget-get widget :to) offset 1))
|
||
(goto-char (min (+ from offset) (1- (widget-get widget :to))))))))
|
||
|
||
(defun widget-default-value-inline (widget)
|
||
"Wrap value in a list unless it is inline."
|
||
(if (widget-get widget :inline)
|
||
(widget-value widget)
|
||
(list (widget-value widget))))
|
||
|
||
(defun widget-default-default-get (widget)
|
||
"Get `:value'."
|
||
(widget-get widget :value))
|
||
|
||
(defun widget-default-menu-tag-get (widget)
|
||
"Use tag or value for menus."
|
||
(or (widget-get widget :menu-tag)
|
||
(widget-get widget :tag)
|
||
(widget-princ-to-string (widget-get widget :value))))
|
||
|
||
(defun widget-default-active (widget)
|
||
"Return t if this widget is active (user modifiable)."
|
||
(or (widget-get widget :always-active)
|
||
(and (not (widget-get widget :inactive))
|
||
(let ((parent (widget-get widget :parent)))
|
||
(or (null parent)
|
||
(widget-apply parent :active))))))
|
||
|
||
(defun widget-default-deactivate (widget)
|
||
"Make WIDGET inactive for user modifications."
|
||
(widget-specify-inactive widget
|
||
(widget-get widget :from)
|
||
(widget-get widget :to)))
|
||
|
||
(defun widget-default-action (widget &optional event)
|
||
"Notify the parent when a widget changes."
|
||
(let ((parent (widget-get widget :parent)))
|
||
(when parent
|
||
(widget-apply parent :notify widget event))))
|
||
|
||
(defun widget-default-notify (widget child &optional event)
|
||
"Pass notification to parent."
|
||
(widget-default-action widget event))
|
||
|
||
(defun widget-default-prompt-value (widget prompt value unbound)
|
||
"Read an arbitrary value."
|
||
(eval-minibuffer prompt))
|
||
|
||
(defun widget-docstring (widget)
|
||
"Return the documentation string specificied by WIDGET, or nil if none.
|
||
If WIDGET has a `:doc' property, that specifies the documentation string.
|
||
Otherwise, try the `:documentation-property' property. If this
|
||
is a function, call it with the widget's value as an argument; if
|
||
it is a symbol, use this symbol together with the widget's value
|
||
as the argument to `documentation-property'."
|
||
(let ((doc (or (widget-get widget :doc)
|
||
(let ((doc-prop (widget-get widget :documentation-property))
|
||
(value (widget-get widget :value)))
|
||
(cond ((functionp doc-prop)
|
||
(funcall doc-prop value))
|
||
((symbolp doc-prop)
|
||
(documentation-property value doc-prop)))))))
|
||
(when (and (stringp doc) (> (length doc) 0))
|
||
;; Remove any redundant `*' in the beginning.
|
||
(when (eq (aref doc 0) ?*)
|
||
(setq doc (substring doc 1)))
|
||
;; Remove trailing newlines.
|
||
(when (string-match "\n+\\'" doc)
|
||
(setq doc (substring doc 0 (match-beginning 0))))
|
||
doc)))
|
||
|
||
;;; The `item' Widget.
|
||
|
||
(define-widget 'item 'default
|
||
"Constant items for inclusion in other widgets."
|
||
:convert-widget 'widget-value-convert-widget
|
||
:value-create 'widget-item-value-create
|
||
:value-delete 'ignore
|
||
:value-get 'widget-value-value-get
|
||
:match 'widget-item-match
|
||
:match-inline 'widget-item-match-inline
|
||
:action 'widget-item-action
|
||
:format "%t\n")
|
||
|
||
(defun widget-item-value-create (widget)
|
||
"Insert the printed representation of the value."
|
||
(princ (widget-get widget :value) (current-buffer)))
|
||
|
||
(defun widget-item-match (widget value)
|
||
;; Match if the value is the same.
|
||
(equal (widget-get widget :value) value))
|
||
|
||
(defun widget-item-match-inline (widget values)
|
||
;; Match if the value is the same.
|
||
(let ((value (widget-get widget :value)))
|
||
(and (listp value)
|
||
(<= (length value) (length values))
|
||
(let ((head (widget-sublist values 0 (length value))))
|
||
(and (equal head value)
|
||
(cons head (widget-sublist values (length value))))))))
|
||
|
||
(defun widget-sublist (list start &optional end)
|
||
"Return the sublist of LIST from START to END.
|
||
If END is omitted, it defaults to the length of LIST."
|
||
(if (> start 0) (setq list (nthcdr start list)))
|
||
(if end
|
||
(unless (<= end start)
|
||
(setq list (copy-sequence list))
|
||
(setcdr (nthcdr (- end start 1) list) nil)
|
||
list)
|
||
(copy-sequence list)))
|
||
|
||
(defun widget-item-action (widget &optional event)
|
||
;; Just notify itself.
|
||
(widget-apply widget :notify widget event))
|
||
|
||
;;; The `push-button' Widget.
|
||
|
||
;; (defcustom widget-push-button-gui t
|
||
;; "If non-nil, use GUI push buttons when available."
|
||
;; :group 'widgets
|
||
;; :type 'boolean)
|
||
|
||
;; Cache already created GUI objects.
|
||
;; (defvar widget-push-button-cache nil)
|
||
|
||
(defcustom widget-push-button-prefix "["
|
||
"String used as prefix for buttons."
|
||
:type 'string
|
||
:group 'widget-button)
|
||
|
||
(defcustom widget-push-button-suffix "]"
|
||
"String used as suffix for buttons."
|
||
:type 'string
|
||
:group 'widget-button)
|
||
|
||
(define-widget 'push-button 'item
|
||
"A pushable button."
|
||
:button-prefix ""
|
||
:button-suffix ""
|
||
:value-create 'widget-push-button-value-create
|
||
:format "%[%v%]")
|
||
|
||
(defun widget-push-button-value-create (widget)
|
||
"Insert text representing the `on' and `off' states."
|
||
(let* ((tag (or (widget-get widget :tag)
|
||
(widget-get widget :value)))
|
||
(tag-glyph (widget-get widget :tag-glyph))
|
||
(text (concat widget-push-button-prefix
|
||
tag widget-push-button-suffix)))
|
||
(if tag-glyph
|
||
(widget-image-insert widget text tag-glyph)
|
||
(insert text))))
|
||
|
||
;; (defun widget-gui-action (widget)
|
||
;; "Apply :action for WIDGET."
|
||
;; (widget-apply-action widget (this-command-keys)))
|
||
|
||
;;; The `link' Widget.
|
||
|
||
(defcustom widget-link-prefix "["
|
||
"String used as prefix for links."
|
||
:type 'string
|
||
:group 'widget-button)
|
||
|
||
(defcustom widget-link-suffix "]"
|
||
"String used as suffix for links."
|
||
:type 'string
|
||
:group 'widget-button)
|
||
|
||
(define-widget 'link 'item
|
||
"An embedded link."
|
||
:button-prefix 'widget-link-prefix
|
||
:button-suffix 'widget-link-suffix
|
||
:follow-link 'mouse-face
|
||
:help-echo "Follow the link."
|
||
:format "%[%t%]")
|
||
|
||
;;; The `info-link' Widget.
|
||
|
||
(define-widget 'info-link 'link
|
||
"A link to an info file."
|
||
:action 'widget-info-link-action)
|
||
|
||
(defun widget-info-link-action (widget &optional event)
|
||
"Open the info node specified by WIDGET."
|
||
(info (widget-value widget)))
|
||
|
||
;;; The `url-link' Widget.
|
||
|
||
(define-widget 'url-link 'link
|
||
"A link to an www page."
|
||
:action 'widget-url-link-action)
|
||
|
||
(defun widget-url-link-action (widget &optional event)
|
||
"Open the URL specified by WIDGET."
|
||
(browse-url (widget-value widget)))
|
||
|
||
;;; The `function-link' Widget.
|
||
|
||
(define-widget 'function-link 'link
|
||
"A link to an Emacs function."
|
||
:action 'widget-function-link-action)
|
||
|
||
(defun widget-function-link-action (widget &optional event)
|
||
"Show the function specified by WIDGET."
|
||
(describe-function (widget-value widget)))
|
||
|
||
;;; The `variable-link' Widget.
|
||
|
||
(define-widget 'variable-link 'link
|
||
"A link to an Emacs variable."
|
||
:action 'widget-variable-link-action)
|
||
|
||
(defun widget-variable-link-action (widget &optional event)
|
||
"Show the variable specified by WIDGET."
|
||
(describe-variable (widget-value widget)))
|
||
|
||
;;; The `file-link' Widget.
|
||
|
||
(define-widget 'file-link 'link
|
||
"A link to a file."
|
||
:action 'widget-file-link-action)
|
||
|
||
(defun widget-file-link-action (widget &optional event)
|
||
"Find the file specified by WIDGET."
|
||
(find-file (widget-value widget)))
|
||
|
||
;;; The `emacs-library-link' Widget.
|
||
|
||
(define-widget 'emacs-library-link 'link
|
||
"A link to an Emacs Lisp library file."
|
||
:action 'widget-emacs-library-link-action)
|
||
|
||
(defun widget-emacs-library-link-action (widget &optional event)
|
||
"Find the Emacs library file specified by WIDGET."
|
||
(find-file (locate-library (widget-value widget))))
|
||
|
||
;;; The `emacs-commentary-link' Widget.
|
||
|
||
(define-widget 'emacs-commentary-link 'link
|
||
"A link to Commentary in an Emacs Lisp library file."
|
||
:action 'widget-emacs-commentary-link-action)
|
||
|
||
(defun widget-emacs-commentary-link-action (widget &optional event)
|
||
"Find the Commentary section of the Emacs file specified by WIDGET."
|
||
(finder-commentary (widget-value widget)))
|
||
|
||
;;; The `editable-field' Widget.
|
||
|
||
(define-widget 'editable-field 'default
|
||
"An editable text field.
|
||
Note: In an `editable-field' widget, the `%v' escape must be preceded
|
||
by some other text in the `:format' string (if specified)."
|
||
:convert-widget 'widget-value-convert-widget
|
||
:keymap widget-field-keymap
|
||
:format "%v"
|
||
:help-echo "M-TAB: complete field; RET: enter value"
|
||
:value ""
|
||
:prompt-internal 'widget-field-prompt-internal
|
||
:prompt-history 'widget-field-history
|
||
:prompt-value 'widget-field-prompt-value
|
||
:action 'widget-field-action
|
||
:validate 'widget-field-validate
|
||
:valid-regexp ""
|
||
:error "Field's value doesn't match allowed forms"
|
||
:value-create 'widget-field-value-create
|
||
:value-delete 'widget-field-value-delete
|
||
:value-get 'widget-field-value-get
|
||
:match 'widget-field-match)
|
||
|
||
(defvar widget-field-history nil
|
||
"History of field minibuffer edits.")
|
||
|
||
(defun widget-field-prompt-internal (widget prompt initial history)
|
||
"Read string for WIDGET prompting with PROMPT.
|
||
INITIAL is the initial input and HISTORY is a symbol containing
|
||
the earlier input."
|
||
(read-string prompt initial history))
|
||
|
||
(defun widget-field-prompt-value (widget prompt value unbound)
|
||
"Prompt for a string."
|
||
(widget-apply widget
|
||
:value-to-external
|
||
(widget-apply widget
|
||
:prompt-internal prompt
|
||
(unless unbound
|
||
(cons (widget-apply widget
|
||
:value-to-internal value)
|
||
0))
|
||
(widget-get widget :prompt-history))))
|
||
|
||
(defvar widget-edit-functions nil)
|
||
|
||
(defun widget-field-action (widget &optional event)
|
||
"Move to next field."
|
||
(widget-forward 1)
|
||
(run-hook-with-args 'widget-edit-functions widget))
|
||
|
||
(defun widget-field-validate (widget)
|
||
"Valid if the content matches `:valid-regexp'."
|
||
(unless (string-match (widget-get widget :valid-regexp)
|
||
(widget-apply widget :value-get))
|
||
widget))
|
||
|
||
(defun widget-field-value-create (widget)
|
||
"Create an editable text field."
|
||
(let ((size (widget-get widget :size))
|
||
(value (widget-get widget :value))
|
||
(from (point))
|
||
;; This is changed to a real overlay in `widget-setup'. We
|
||
;; need the end points to behave differently until
|
||
;; `widget-setup' is called.
|
||
(overlay (cons (make-marker) (make-marker))))
|
||
(widget-put widget :field-overlay overlay)
|
||
(insert value)
|
||
(and size
|
||
(< (length value) size)
|
||
(insert-char ?\s (- size (length value))))
|
||
(unless (memq widget widget-field-list)
|
||
(setq widget-field-new (cons widget widget-field-new)))
|
||
(move-marker (cdr overlay) (point))
|
||
(set-marker-insertion-type (cdr overlay) nil)
|
||
(when (null size)
|
||
(insert ?\n))
|
||
(move-marker (car overlay) from)
|
||
(set-marker-insertion-type (car overlay) t)))
|
||
|
||
(defun widget-field-value-delete (widget)
|
||
"Remove the widget from the list of active editing fields."
|
||
(setq widget-field-list (delq widget widget-field-list))
|
||
(setq widget-field-new (delq widget widget-field-new))
|
||
;; These are nil if the :format string doesn't contain `%v'.
|
||
(let ((overlay (widget-get widget :field-overlay)))
|
||
(when (overlayp overlay)
|
||
(delete-overlay overlay))))
|
||
|
||
(defun widget-field-value-get (widget)
|
||
"Return current text in editing field."
|
||
(let ((from (widget-field-start widget))
|
||
(to (widget-field-text-end widget))
|
||
(buffer (widget-field-buffer widget))
|
||
(size (widget-get widget :size))
|
||
(secret (widget-get widget :secret))
|
||
(old (current-buffer)))
|
||
(if (and from to)
|
||
(progn
|
||
(set-buffer buffer)
|
||
(let ((result (buffer-substring-no-properties from to)))
|
||
(when secret
|
||
(let ((index 0))
|
||
(while (< (+ from index) to)
|
||
(aset result index
|
||
(get-char-property (+ from index) 'secret))
|
||
(setq index (1+ index)))))
|
||
(set-buffer old)
|
||
result))
|
||
(widget-get widget :value))))
|
||
|
||
(defun widget-field-match (widget value)
|
||
;; Match any string.
|
||
(stringp value))
|
||
|
||
;;; The `text' Widget.
|
||
|
||
(define-widget 'text 'editable-field
|
||
"A multiline text area."
|
||
:keymap widget-text-keymap)
|
||
|
||
;;; The `menu-choice' Widget.
|
||
|
||
(define-widget 'menu-choice 'default
|
||
"A menu of options."
|
||
:convert-widget 'widget-types-convert-widget
|
||
:copy 'widget-types-copy
|
||
:format "%[%t%]: %v"
|
||
:case-fold t
|
||
:tag "choice"
|
||
:void '(item :format "invalid (%t)\n")
|
||
:value-create 'widget-choice-value-create
|
||
:value-get 'widget-child-value-get
|
||
:value-inline 'widget-child-value-inline
|
||
:default-get 'widget-choice-default-get
|
||
:mouse-down-action 'widget-choice-mouse-down-action
|
||
:action 'widget-choice-action
|
||
:error "Make a choice"
|
||
:validate 'widget-choice-validate
|
||
:match 'widget-choice-match
|
||
:match-inline 'widget-choice-match-inline)
|
||
|
||
(defun widget-choice-value-create (widget)
|
||
"Insert the first choice that matches the value."
|
||
(let ((value (widget-get widget :value))
|
||
(args (widget-get widget :args))
|
||
(explicit (widget-get widget :explicit-choice))
|
||
current)
|
||
(if explicit
|
||
(progn
|
||
;; If the user specified the choice for this value,
|
||
;; respect that choice.
|
||
(widget-put widget :children (list (widget-create-child-value
|
||
widget explicit value)))
|
||
(widget-put widget :choice explicit)
|
||
(widget-put widget :explicit-choice nil))
|
||
(while args
|
||
(setq current (car args)
|
||
args (cdr args))
|
||
(when (widget-apply current :match value)
|
||
(widget-put widget :children (list (widget-create-child-value
|
||
widget current value)))
|
||
(widget-put widget :choice current)
|
||
(setq args nil
|
||
current nil)))
|
||
(when current
|
||
(let ((void (widget-get widget :void)))
|
||
(widget-put widget :children (list (widget-create-child-and-convert
|
||
widget void :value value)))
|
||
(widget-put widget :choice void))))))
|
||
|
||
(defun widget-choice-default-get (widget)
|
||
;; Get default for the first choice.
|
||
(widget-default-get (car (widget-get widget :args))))
|
||
|
||
(defcustom widget-choice-toggle nil
|
||
"If non-nil, a binary choice will just toggle between the values.
|
||
Otherwise, the user will explicitly have to choose between the values
|
||
when he invoked the menu."
|
||
:type 'boolean
|
||
:group 'widgets)
|
||
|
||
(defun widget-choice-mouse-down-action (widget &optional event)
|
||
;; Return non-nil if we need a menu.
|
||
(let ((args (widget-get widget :args))
|
||
(old (widget-get widget :choice)))
|
||
(cond ((not (display-popup-menus-p))
|
||
;; No place to pop up a menu.
|
||
nil)
|
||
((< (length args) 2)
|
||
;; Empty or singleton list, just return the value.
|
||
nil)
|
||
((> (length args) widget-menu-max-size)
|
||
;; Too long, prompt.
|
||
nil)
|
||
((> (length args) 2)
|
||
;; Reasonable sized list, use menu.
|
||
t)
|
||
((and widget-choice-toggle (memq old args))
|
||
;; We toggle.
|
||
nil)
|
||
(t
|
||
;; Ask which of the two.
|
||
t))))
|
||
|
||
(defun widget-choice-action (widget &optional event)
|
||
;; Make a choice.
|
||
(let ((args (widget-get widget :args))
|
||
(old (widget-get widget :choice))
|
||
(tag (widget-apply widget :menu-tag-get))
|
||
(completion-ignore-case (widget-get widget :case-fold))
|
||
this-explicit
|
||
current choices)
|
||
;; Remember old value.
|
||
(if (and old (not (widget-apply widget :validate)))
|
||
(let* ((external (widget-value widget))
|
||
(internal (widget-apply old :value-to-internal external)))
|
||
(widget-put old :value internal)))
|
||
;; Find new choice.
|
||
(setq current
|
||
(cond ((= (length args) 0)
|
||
nil)
|
||
((= (length args) 1)
|
||
(nth 0 args))
|
||
((and widget-choice-toggle
|
||
(= (length args) 2)
|
||
(memq old args))
|
||
(if (eq old (nth 0 args))
|
||
(nth 1 args)
|
||
(nth 0 args)))
|
||
(t
|
||
(while args
|
||
(setq current (car args)
|
||
args (cdr args))
|
||
(setq choices
|
||
(cons (cons (widget-apply current :menu-tag-get)
|
||
current)
|
||
choices)))
|
||
(setq this-explicit t)
|
||
(widget-choose tag (reverse choices) event))))
|
||
(when current
|
||
;; If this was an explicit user choice, record the choice,
|
||
;; so that widget-choice-value-create will respect it.
|
||
(when this-explicit
|
||
(widget-put widget :explicit-choice current))
|
||
(widget-value-set widget (widget-default-get current))
|
||
(widget-setup)
|
||
(widget-apply widget :notify widget event)))
|
||
(run-hook-with-args 'widget-edit-functions widget))
|
||
|
||
(defun widget-choice-validate (widget)
|
||
;; Valid if we have made a valid choice.
|
||
(if (eq (widget-get widget :void) (widget-get widget :choice))
|
||
widget
|
||
(widget-apply (car (widget-get widget :children)) :validate)))
|
||
|
||
(defun widget-choice-match (widget value)
|
||
;; Matches if one of the choices matches.
|
||
(let ((args (widget-get widget :args))
|
||
current found)
|
||
(while (and args (not found))
|
||
(setq current (car args)
|
||
args (cdr args)
|
||
found (widget-apply current :match value)))
|
||
found))
|
||
|
||
(defun widget-choice-match-inline (widget values)
|
||
;; Matches if one of the choices matches.
|
||
(let ((args (widget-get widget :args))
|
||
current found)
|
||
(while (and args (null found))
|
||
(setq current (car args)
|
||
args (cdr args)
|
||
found (widget-match-inline current values)))
|
||
found))
|
||
|
||
;;; The `toggle' Widget.
|
||
|
||
(define-widget 'toggle 'item
|
||
"Toggle between two states."
|
||
:format "%[%v%]\n"
|
||
:value-create 'widget-toggle-value-create
|
||
:action 'widget-toggle-action
|
||
:match (lambda (widget value) t)
|
||
:on "on"
|
||
:off "off")
|
||
|
||
(defun widget-toggle-value-create (widget)
|
||
"Insert text representing the `on' and `off' states."
|
||
(if (widget-value widget)
|
||
(let ((image (widget-get widget :on-glyph)))
|
||
(and (display-graphic-p)
|
||
(listp image)
|
||
(not (eq (car image) 'image))
|
||
(widget-put widget :on-glyph (setq image (eval image))))
|
||
(widget-image-insert widget
|
||
(widget-get widget :on)
|
||
image))
|
||
(let ((image (widget-get widget :off-glyph)))
|
||
(and (display-graphic-p)
|
||
(listp image)
|
||
(not (eq (car image) 'image))
|
||
(widget-put widget :off-glyph (setq image (eval image))))
|
||
(widget-image-insert widget (widget-get widget :off) image))))
|
||
|
||
(defun widget-toggle-action (widget &optional event)
|
||
;; Toggle value.
|
||
(widget-value-set widget (not (widget-value widget)))
|
||
(widget-apply widget :notify widget event)
|
||
(run-hook-with-args 'widget-edit-functions widget))
|
||
|
||
;;; The `checkbox' Widget.
|
||
|
||
(define-widget 'checkbox 'toggle
|
||
"A checkbox toggle."
|
||
:button-suffix ""
|
||
:button-prefix ""
|
||
:format "%[%v%]"
|
||
:on "[X]"
|
||
;; We could probably do the same job as the images using single
|
||
;; space characters in a boxed face with a stretch specification to
|
||
;; make them square.
|
||
:on-glyph '(create-image "\300\300\141\143\067\076\034\030"
|
||
'xbm t :width 8 :height 8
|
||
:background "grey75" ; like default mode line
|
||
:foreground "black"
|
||
:relief -2
|
||
:ascent 'center)
|
||
:off "[ ]"
|
||
:off-glyph '(create-image (make-string 8 0)
|
||
'xbm t :width 8 :height 8
|
||
:background "grey75"
|
||
:foreground "black"
|
||
:relief -2
|
||
:ascent 'center)
|
||
:help-echo "Toggle this item."
|
||
:action 'widget-checkbox-action)
|
||
|
||
(defun widget-checkbox-action (widget &optional event)
|
||
"Toggle checkbox, notify parent, and set active state of sibling."
|
||
(widget-toggle-action widget event)
|
||
(let ((sibling (widget-get-sibling widget)))
|
||
(when sibling
|
||
(if (widget-value widget)
|
||
(widget-apply sibling :activate)
|
||
(widget-apply sibling :deactivate))
|
||
(widget-clear-undo))))
|
||
|
||
;;; The `checklist' Widget.
|
||
|
||
(define-widget 'checklist 'default
|
||
"A multiple choice widget."
|
||
:convert-widget 'widget-types-convert-widget
|
||
:copy 'widget-types-copy
|
||
:format "%v"
|
||
:offset 4
|
||
:entry-format "%b %v"
|
||
:greedy nil
|
||
:value-create 'widget-checklist-value-create
|
||
:value-get 'widget-checklist-value-get
|
||
:validate 'widget-checklist-validate
|
||
:match 'widget-checklist-match
|
||
:match-inline 'widget-checklist-match-inline)
|
||
|
||
(defun widget-checklist-value-create (widget)
|
||
;; Insert all values
|
||
(let ((alist (widget-checklist-match-find widget (widget-get widget :value)))
|
||
(args (widget-get widget :args)))
|
||
(while args
|
||
(widget-checklist-add-item widget (car args) (assq (car args) alist))
|
||
(setq args (cdr args)))
|
||
(widget-put widget :children (nreverse (widget-get widget :children)))))
|
||
|
||
(defun widget-checklist-add-item (widget type chosen)
|
||
"Create checklist item in WIDGET of type TYPE.
|
||
If the item is checked, CHOSEN is a cons whose cdr is the value."
|
||
(and (eq (preceding-char) ?\n)
|
||
(widget-get widget :indent)
|
||
(insert-char ?\s (widget-get widget :indent)))
|
||
(widget-specify-insert
|
||
(let* ((children (widget-get widget :children))
|
||
(buttons (widget-get widget :buttons))
|
||
(button-args (or (widget-get type :sibling-args)
|
||
(widget-get widget :button-args)))
|
||
(from (point))
|
||
child button)
|
||
(insert (widget-get widget :entry-format))
|
||
(goto-char from)
|
||
;; Parse % escapes in format.
|
||
(while (re-search-forward "%\\([bv%]\\)" nil t)
|
||
(let ((escape (char-after (match-beginning 1))))
|
||
(delete-backward-char 2)
|
||
(cond ((eq escape ?%)
|
||
(insert ?%))
|
||
((eq escape ?b)
|
||
(setq button (apply 'widget-create-child-and-convert
|
||
widget 'checkbox
|
||
:value (not (null chosen))
|
||
button-args)))
|
||
((eq escape ?v)
|
||
(setq child
|
||
(cond ((not chosen)
|
||
(let ((child (widget-create-child widget type)))
|
||
(widget-apply child :deactivate)
|
||
child))
|
||
((widget-get type :inline)
|
||
(widget-create-child-value
|
||
widget type (cdr chosen)))
|
||
(t
|
||
(widget-create-child-value
|
||
widget type (car (cdr chosen)))))))
|
||
(t
|
||
(error "Unknown escape `%c'" escape)))))
|
||
;; Update properties.
|
||
(and button child (widget-put child :button button))
|
||
(and button (widget-put widget :buttons (cons button buttons)))
|
||
(and child (widget-put widget :children (cons child children))))))
|
||
|
||
(defun widget-checklist-match (widget values)
|
||
;; All values must match a type in the checklist.
|
||
(and (listp values)
|
||
(null (cdr (widget-checklist-match-inline widget values)))))
|
||
|
||
(defun widget-checklist-match-inline (widget values)
|
||
;; Find the values which match a type in the checklist.
|
||
(let ((greedy (widget-get widget :greedy))
|
||
(args (copy-sequence (widget-get widget :args)))
|
||
found rest)
|
||
(while values
|
||
(let ((answer (widget-checklist-match-up args values)))
|
||
(cond (answer
|
||
(let ((vals (widget-match-inline answer values)))
|
||
(setq found (append found (car vals))
|
||
values (cdr vals)
|
||
args (delq answer args))))
|
||
(greedy
|
||
(setq rest (append rest (list (car values)))
|
||
values (cdr values)))
|
||
(t
|
||
(setq rest (append rest values)
|
||
values nil)))))
|
||
(cons found rest)))
|
||
|
||
(defun widget-checklist-match-find (widget vals)
|
||
"Find the vals which match a type in the checklist.
|
||
Return an alist of (TYPE MATCH)."
|
||
(let ((greedy (widget-get widget :greedy))
|
||
(args (copy-sequence (widget-get widget :args)))
|
||
found)
|
||
(while vals
|
||
(let ((answer (widget-checklist-match-up args vals)))
|
||
(cond (answer
|
||
(let ((match (widget-match-inline answer vals)))
|
||
(setq found (cons (cons answer (car match)) found)
|
||
vals (cdr match)
|
||
args (delq answer args))))
|
||
(greedy
|
||
(setq vals (cdr vals)))
|
||
(t
|
||
(setq vals nil)))))
|
||
found))
|
||
|
||
(defun widget-checklist-match-up (args vals)
|
||
"Return the first type from ARGS that matches VALS."
|
||
(let (current found)
|
||
(while (and args (null found))
|
||
(setq current (car args)
|
||
args (cdr args)
|
||
found (widget-match-inline current vals)))
|
||
(if found
|
||
current)))
|
||
|
||
(defun widget-checklist-value-get (widget)
|
||
;; The values of all selected items.
|
||
(let ((children (widget-get widget :children))
|
||
child result)
|
||
(while children
|
||
(setq child (car children)
|
||
children (cdr children))
|
||
(if (widget-value (widget-get child :button))
|
||
(setq result (append result (widget-apply child :value-inline)))))
|
||
result))
|
||
|
||
(defun widget-checklist-validate (widget)
|
||
;; Ticked chilren must be valid.
|
||
(let ((children (widget-get widget :children))
|
||
child button found)
|
||
(while (and children (not found))
|
||
(setq child (car children)
|
||
children (cdr children)
|
||
button (widget-get child :button)
|
||
found (and (widget-value button)
|
||
(widget-apply child :validate))))
|
||
found))
|
||
|
||
;;; The `option' Widget
|
||
|
||
(define-widget 'option 'checklist
|
||
"An widget with an optional item."
|
||
:inline t)
|
||
|
||
;;; The `choice-item' Widget.
|
||
|
||
(define-widget 'choice-item 'item
|
||
"Button items that delegate action events to their parents."
|
||
:action 'widget-parent-action
|
||
:format "%[%t%] \n")
|
||
|
||
;;; The `radio-button' Widget.
|
||
|
||
(define-widget 'radio-button 'toggle
|
||
"A radio button for use in the `radio' widget."
|
||
:notify 'widget-radio-button-notify
|
||
:format "%[%v%]"
|
||
:button-suffix ""
|
||
:button-prefix ""
|
||
:on "(*)"
|
||
:on-glyph "radio1"
|
||
:off "( )"
|
||
:off-glyph "radio0")
|
||
|
||
(defun widget-radio-button-notify (widget child &optional event)
|
||
;; Tell daddy.
|
||
(widget-apply (widget-get widget :parent) :action widget event))
|
||
|
||
;;; The `radio-button-choice' Widget.
|
||
|
||
(define-widget 'radio-button-choice 'default
|
||
"Select one of multiple options."
|
||
:convert-widget 'widget-types-convert-widget
|
||
:copy 'widget-types-copy
|
||
:offset 4
|
||
:format "%v"
|
||
:entry-format "%b %v"
|
||
:value-create 'widget-radio-value-create
|
||
:value-get 'widget-radio-value-get
|
||
:value-inline 'widget-radio-value-inline
|
||
:value-set 'widget-radio-value-set
|
||
:error "You must push one of the buttons"
|
||
:validate 'widget-radio-validate
|
||
:match 'widget-choice-match
|
||
:match-inline 'widget-choice-match-inline
|
||
:action 'widget-radio-action)
|
||
|
||
(defun widget-radio-value-create (widget)
|
||
;; Insert all values
|
||
(let ((args (widget-get widget :args))
|
||
arg)
|
||
(while args
|
||
(setq arg (car args)
|
||
args (cdr args))
|
||
(widget-radio-add-item widget arg))))
|
||
|
||
(defun widget-radio-add-item (widget type)
|
||
"Add to radio widget WIDGET a new radio button item of type TYPE."
|
||
;; (setq type (widget-convert type))
|
||
(and (eq (preceding-char) ?\n)
|
||
(widget-get widget :indent)
|
||
(insert-char ?\s (widget-get widget :indent)))
|
||
(widget-specify-insert
|
||
(let* ((value (widget-get widget :value))
|
||
(children (widget-get widget :children))
|
||
(buttons (widget-get widget :buttons))
|
||
(button-args (or (widget-get type :sibling-args)
|
||
(widget-get widget :button-args)))
|
||
(from (point))
|
||
(chosen (and (null (widget-get widget :choice))
|
||
(widget-apply type :match value)))
|
||
child button)
|
||
(insert (widget-get widget :entry-format))
|
||
(goto-char from)
|
||
;; Parse % escapes in format.
|
||
(while (re-search-forward "%\\([bv%]\\)" nil t)
|
||
(let ((escape (char-after (match-beginning 1))))
|
||
(delete-backward-char 2)
|
||
(cond ((eq escape ?%)
|
||
(insert ?%))
|
||
((eq escape ?b)
|
||
(setq button (apply 'widget-create-child-and-convert
|
||
widget 'radio-button
|
||
:value (not (null chosen))
|
||
button-args)))
|
||
((eq escape ?v)
|
||
(setq child (if chosen
|
||
(widget-create-child-value
|
||
widget type value)
|
||
(widget-create-child widget type)))
|
||
(unless chosen
|
||
(widget-apply child :deactivate)))
|
||
(t
|
||
(error "Unknown escape `%c'" escape)))))
|
||
;; Update properties.
|
||
(when chosen
|
||
(widget-put widget :choice type))
|
||
(when button
|
||
(widget-put child :button button)
|
||
(widget-put widget :buttons (nconc buttons (list button))))
|
||
(when child
|
||
(widget-put widget :children (nconc children (list child))))
|
||
child)))
|
||
|
||
(defun widget-radio-value-get (widget)
|
||
;; Get value of the child widget.
|
||
(let ((chosen (widget-radio-chosen widget)))
|
||
(and chosen (widget-value chosen))))
|
||
|
||
(defun widget-radio-chosen (widget)
|
||
"Return the widget representing the chosen radio button."
|
||
(let ((children (widget-get widget :children))
|
||
current found)
|
||
(while children
|
||
(setq current (car children)
|
||
children (cdr children))
|
||
(when (widget-apply (widget-get current :button) :value-get)
|
||
(setq found current
|
||
children nil)))
|
||
found))
|
||
|
||
(defun widget-radio-value-inline (widget)
|
||
;; Get value of the child widget.
|
||
(let ((children (widget-get widget :children))
|
||
current found)
|
||
(while children
|
||
(setq current (car children)
|
||
children (cdr children))
|
||
(when (widget-apply (widget-get current :button) :value-get)
|
||
(setq found (widget-apply current :value-inline)
|
||
children nil)))
|
||
found))
|
||
|
||
(defun widget-radio-value-set (widget value)
|
||
;; We can't just delete and recreate a radio widget, since children
|
||
;; can be added after the original creation and won't be recreated
|
||
;; by `:create'.
|
||
(let ((children (widget-get widget :children))
|
||
current found)
|
||
(while children
|
||
(setq current (car children)
|
||
children (cdr children))
|
||
(let* ((button (widget-get current :button))
|
||
(match (and (not found)
|
||
(widget-apply current :match value))))
|
||
(widget-value-set button match)
|
||
(if match
|
||
(progn
|
||
(widget-value-set current value)
|
||
(widget-apply current :activate))
|
||
(widget-apply current :deactivate))
|
||
(setq found (or found match))))))
|
||
|
||
(defun widget-radio-validate (widget)
|
||
;; Valid if we have made a valid choice.
|
||
(let ((children (widget-get widget :children))
|
||
current found button)
|
||
(while (and children (not found))
|
||
(setq current (car children)
|
||
children (cdr children)
|
||
button (widget-get current :button)
|
||
found (widget-apply button :value-get)))
|
||
(if found
|
||
(widget-apply current :validate)
|
||
widget)))
|
||
|
||
(defun widget-radio-action (widget child event)
|
||
;; Check if a radio button was pressed.
|
||
(let ((children (widget-get widget :children))
|
||
(buttons (widget-get widget :buttons))
|
||
current)
|
||
(when (memq child buttons)
|
||
(while children
|
||
(setq current (car children)
|
||
children (cdr children))
|
||
(let* ((button (widget-get current :button)))
|
||
(cond ((eq child button)
|
||
(widget-value-set button t)
|
||
(widget-apply current :activate))
|
||
((widget-value button)
|
||
(widget-value-set button nil)
|
||
(widget-apply current :deactivate)))))))
|
||
;; Pass notification to parent.
|
||
(widget-apply widget :notify child event))
|
||
|
||
;;; The `insert-button' Widget.
|
||
|
||
(define-widget 'insert-button 'push-button
|
||
"An insert button for the `editable-list' widget."
|
||
:tag "INS"
|
||
:help-echo "Insert a new item into the list at this position."
|
||
:action 'widget-insert-button-action)
|
||
|
||
(defun widget-insert-button-action (widget &optional event)
|
||
;; Ask the parent to insert a new item.
|
||
(widget-apply (widget-get widget :parent)
|
||
:insert-before (widget-get widget :widget)))
|
||
|
||
;;; The `delete-button' Widget.
|
||
|
||
(define-widget 'delete-button 'push-button
|
||
"A delete button for the `editable-list' widget."
|
||
:tag "DEL"
|
||
:help-echo "Delete this item from the list."
|
||
:action 'widget-delete-button-action)
|
||
|
||
(defun widget-delete-button-action (widget &optional event)
|
||
;; Ask the parent to insert a new item.
|
||
(widget-apply (widget-get widget :parent)
|
||
:delete-at (widget-get widget :widget)))
|
||
|
||
;;; The `editable-list' Widget.
|
||
|
||
;; (defcustom widget-editable-list-gui nil
|
||
;; "If non-nil, use GUI push-buttons in editable list when available."
|
||
;; :type 'boolean
|
||
;; :group 'widgets)
|
||
|
||
(define-widget 'editable-list 'default
|
||
"A variable list of widgets of the same type."
|
||
:convert-widget 'widget-types-convert-widget
|
||
:copy 'widget-types-copy
|
||
:offset 12
|
||
:format "%v%i\n"
|
||
:format-handler 'widget-editable-list-format-handler
|
||
:entry-format "%i %d %v"
|
||
:value-create 'widget-editable-list-value-create
|
||
:value-get 'widget-editable-list-value-get
|
||
:validate 'widget-children-validate
|
||
:match 'widget-editable-list-match
|
||
:match-inline 'widget-editable-list-match-inline
|
||
:insert-before 'widget-editable-list-insert-before
|
||
:delete-at 'widget-editable-list-delete-at)
|
||
|
||
(defun widget-editable-list-format-handler (widget escape)
|
||
;; We recognize the insert button.
|
||
;; (let ((widget-push-button-gui widget-editable-list-gui))
|
||
(cond ((eq escape ?i)
|
||
(and (widget-get widget :indent)
|
||
(insert-char ?\s (widget-get widget :indent)))
|
||
(apply 'widget-create-child-and-convert
|
||
widget 'insert-button
|
||
(widget-get widget :append-button-args)))
|
||
(t
|
||
(widget-default-format-handler widget escape)))
|
||
;; )
|
||
)
|
||
|
||
(defun widget-editable-list-value-create (widget)
|
||
;; Insert all values
|
||
(let* ((value (widget-get widget :value))
|
||
(type (nth 0 (widget-get widget :args)))
|
||
children)
|
||
(widget-put widget :value-pos (copy-marker (point)))
|
||
(set-marker-insertion-type (widget-get widget :value-pos) t)
|
||
(while value
|
||
(let ((answer (widget-match-inline type value)))
|
||
(if answer
|
||
(setq children (cons (widget-editable-list-entry-create
|
||
widget
|
||
(if (widget-get type :inline)
|
||
(car answer)
|
||
(car (car answer)))
|
||
t)
|
||
children)
|
||
value (cdr answer))
|
||
(setq value nil))))
|
||
(widget-put widget :children (nreverse children))))
|
||
|
||
(defun widget-editable-list-value-get (widget)
|
||
;; Get value of the child widget.
|
||
(apply 'append (mapcar (lambda (child) (widget-apply child :value-inline))
|
||
(widget-get widget :children))))
|
||
|
||
(defun widget-editable-list-match (widget value)
|
||
;; Value must be a list and all the members must match the type.
|
||
(and (listp value)
|
||
(null (cdr (widget-editable-list-match-inline widget value)))))
|
||
|
||
(defun widget-editable-list-match-inline (widget value)
|
||
(let ((type (nth 0 (widget-get widget :args)))
|
||
(ok t)
|
||
found)
|
||
(while (and value ok)
|
||
(let ((answer (widget-match-inline type value)))
|
||
(if answer
|
||
(setq found (append found (car answer))
|
||
value (cdr answer))
|
||
(setq ok nil))))
|
||
(cons found value)))
|
||
|
||
(defun widget-editable-list-insert-before (widget before)
|
||
;; Insert a new child in the list of children.
|
||
(save-excursion
|
||
(let ((children (widget-get widget :children))
|
||
(inhibit-read-only t)
|
||
before-change-functions
|
||
after-change-functions)
|
||
(cond (before
|
||
(goto-char (widget-get before :entry-from)))
|
||
(t
|
||
(goto-char (widget-get widget :value-pos))))
|
||
(let ((child (widget-editable-list-entry-create
|
||
widget nil nil)))
|
||
(when (< (widget-get child :entry-from) (widget-get widget :from))
|
||
(set-marker (widget-get widget :from)
|
||
(widget-get child :entry-from)))
|
||
(if (eq (car children) before)
|
||
(widget-put widget :children (cons child children))
|
||
(while (not (eq (car (cdr children)) before))
|
||
(setq children (cdr children)))
|
||
(setcdr children (cons child (cdr children)))))))
|
||
(widget-setup)
|
||
(widget-apply widget :notify widget))
|
||
|
||
(defun widget-editable-list-delete-at (widget child)
|
||
;; Delete child from list of children.
|
||
(save-excursion
|
||
(let ((buttons (copy-sequence (widget-get widget :buttons)))
|
||
button
|
||
(inhibit-read-only t)
|
||
before-change-functions
|
||
after-change-functions)
|
||
(while buttons
|
||
(setq button (car buttons)
|
||
buttons (cdr buttons))
|
||
(when (eq (widget-get button :widget) child)
|
||
(widget-put widget
|
||
:buttons (delq button (widget-get widget :buttons)))
|
||
(widget-delete button))))
|
||
(let ((entry-from (widget-get child :entry-from))
|
||
(entry-to (widget-get child :entry-to))
|
||
(inhibit-read-only t)
|
||
before-change-functions
|
||
after-change-functions)
|
||
(widget-delete child)
|
||
(delete-region entry-from entry-to)
|
||
(set-marker entry-from nil)
|
||
(set-marker entry-to nil))
|
||
(widget-put widget :children (delq child (widget-get widget :children))))
|
||
(widget-setup)
|
||
(widget-apply widget :notify widget))
|
||
|
||
(defun widget-editable-list-entry-create (widget value conv)
|
||
;; Create a new entry to the list.
|
||
(let ((type (nth 0 (widget-get widget :args)))
|
||
;; (widget-push-button-gui widget-editable-list-gui)
|
||
child delete insert)
|
||
(widget-specify-insert
|
||
(save-excursion
|
||
(and (widget-get widget :indent)
|
||
(insert-char ?\s (widget-get widget :indent)))
|
||
(insert (widget-get widget :entry-format)))
|
||
;; Parse % escapes in format.
|
||
(while (re-search-forward "%\\(.\\)" nil t)
|
||
(let ((escape (char-after (match-beginning 1))))
|
||
(delete-backward-char 2)
|
||
(cond ((eq escape ?%)
|
||
(insert ?%))
|
||
((eq escape ?i)
|
||
(setq insert (apply 'widget-create-child-and-convert
|
||
widget 'insert-button
|
||
(widget-get widget :insert-button-args))))
|
||
((eq escape ?d)
|
||
(setq delete (apply 'widget-create-child-and-convert
|
||
widget 'delete-button
|
||
(widget-get widget :delete-button-args))))
|
||
((eq escape ?v)
|
||
(if conv
|
||
(setq child (widget-create-child-value
|
||
widget type value))
|
||
(setq child (widget-create-child-value
|
||
widget type (widget-default-get type)))))
|
||
(t
|
||
(error "Unknown escape `%c'" escape)))))
|
||
(let ((buttons (widget-get widget :buttons)))
|
||
(if insert (push insert buttons))
|
||
(if delete (push delete buttons))
|
||
(widget-put widget :buttons buttons))
|
||
(let ((entry-from (point-min-marker))
|
||
(entry-to (point-max-marker)))
|
||
(set-marker-insertion-type entry-from t)
|
||
(set-marker-insertion-type entry-to nil)
|
||
(widget-put child :entry-from entry-from)
|
||
(widget-put child :entry-to entry-to)))
|
||
(if insert (widget-put insert :widget child))
|
||
(if delete (widget-put delete :widget child))
|
||
child))
|
||
|
||
;;; The `group' Widget.
|
||
|
||
(define-widget 'group 'default
|
||
"A widget which groups other widgets inside."
|
||
:convert-widget 'widget-types-convert-widget
|
||
:copy 'widget-types-copy
|
||
:format "%v"
|
||
:value-create 'widget-group-value-create
|
||
:value-get 'widget-editable-list-value-get
|
||
:default-get 'widget-group-default-get
|
||
:validate 'widget-children-validate
|
||
:match 'widget-group-match
|
||
:match-inline 'widget-group-match-inline)
|
||
|
||
(defun widget-group-value-create (widget)
|
||
;; Create each component.
|
||
(let ((args (widget-get widget :args))
|
||
(value (widget-get widget :value))
|
||
arg answer children)
|
||
(while args
|
||
(setq arg (car args)
|
||
args (cdr args)
|
||
answer (widget-match-inline arg value)
|
||
value (cdr answer))
|
||
(and (eq (preceding-char) ?\n)
|
||
(widget-get widget :indent)
|
||
(insert-char ?\s (widget-get widget :indent)))
|
||
(push (cond ((null answer)
|
||
(widget-create-child widget arg))
|
||
((widget-get arg :inline)
|
||
(widget-create-child-value widget arg (car answer)))
|
||
(t
|
||
(widget-create-child-value widget arg (car (car answer)))))
|
||
children))
|
||
(widget-put widget :children (nreverse children))))
|
||
|
||
(defun widget-group-default-get (widget)
|
||
;; Get the default of the components.
|
||
(mapcar 'widget-default-get (widget-get widget :args)))
|
||
|
||
(defun widget-group-match (widget values)
|
||
;; Match if the components match.
|
||
(and (listp values)
|
||
(let ((match (widget-group-match-inline widget values)))
|
||
(and match (null (cdr match))))))
|
||
|
||
(defun widget-group-match-inline (widget vals)
|
||
;; Match if the components match.
|
||
(let ((args (widget-get widget :args))
|
||
argument answer found)
|
||
(while args
|
||
(setq argument (car args)
|
||
args (cdr args)
|
||
answer (widget-match-inline argument vals))
|
||
(if answer
|
||
(setq vals (cdr answer)
|
||
found (append found (car answer)))
|
||
(setq vals nil
|
||
args nil)))
|
||
(if answer
|
||
(cons found vals))))
|
||
|
||
;;; The `visibility' Widget.
|
||
|
||
(define-widget 'visibility 'item
|
||
"An indicator and manipulator for hidden items."
|
||
:format "%[%v%]"
|
||
:button-prefix ""
|
||
:button-suffix ""
|
||
:on "Hide"
|
||
:off "Show"
|
||
:value-create 'widget-visibility-value-create
|
||
:action 'widget-toggle-action
|
||
:match (lambda (widget value) t))
|
||
|
||
(defun widget-visibility-value-create (widget)
|
||
;; Insert text representing the `on' and `off' states.
|
||
(let ((on (widget-get widget :on))
|
||
(off (widget-get widget :off)))
|
||
(if on
|
||
(setq on (concat widget-push-button-prefix
|
||
on
|
||
widget-push-button-suffix))
|
||
(setq on ""))
|
||
(if off
|
||
(setq off (concat widget-push-button-prefix
|
||
off
|
||
widget-push-button-suffix))
|
||
(setq off ""))
|
||
(if (widget-value widget)
|
||
(widget-image-insert widget on "down" "down-pushed")
|
||
(widget-image-insert widget off "right" "right-pushed"))))
|
||
|
||
;;; The `documentation-link' Widget.
|
||
;;
|
||
;; This is a helper widget for `documentation-string'.
|
||
|
||
(define-widget 'documentation-link 'link
|
||
"Link type used in documentation strings."
|
||
:tab-order -1
|
||
:help-echo "Describe this symbol"
|
||
:action 'widget-documentation-link-action)
|
||
|
||
(defun widget-documentation-link-action (widget &optional event)
|
||
"Display documentation for WIDGET's value. Ignore optional argument EVENT."
|
||
(let* ((string (widget-get widget :value))
|
||
(symbol (intern string)))
|
||
(if (and (fboundp symbol) (boundp symbol))
|
||
;; If there are two doc strings, give the user a way to pick one.
|
||
(apropos (concat "\\`" (regexp-quote string) "\\'"))
|
||
(if (fboundp symbol)
|
||
(describe-function symbol)
|
||
(describe-variable symbol)))))
|
||
|
||
(defcustom widget-documentation-links t
|
||
"Add hyperlinks to documentation strings when non-nil."
|
||
:type 'boolean
|
||
:group 'widget-documentation)
|
||
|
||
(defcustom widget-documentation-link-regexp "`\\([^\n`' ]+\\)'"
|
||
"Regexp for matching potential links in documentation strings.
|
||
The first group should be the link itself."
|
||
:type 'regexp
|
||
:group 'widget-documentation)
|
||
|
||
(defcustom widget-documentation-link-p 'intern-soft
|
||
"Predicate used to test if a string is useful as a link.
|
||
The value should be a function. The function will be called with one
|
||
argument, a string, and should return non-nil if there should be a
|
||
link for that string."
|
||
:type 'function
|
||
:options '(widget-documentation-link-p)
|
||
:group 'widget-documentation)
|
||
|
||
(defcustom widget-documentation-link-type 'documentation-link
|
||
"Widget type used for links in documentation strings."
|
||
:type 'symbol
|
||
:group 'widget-documentation)
|
||
|
||
(defun widget-documentation-link-add (widget from to)
|
||
(widget-specify-doc widget from to)
|
||
(when widget-documentation-links
|
||
(let ((regexp widget-documentation-link-regexp)
|
||
(buttons (widget-get widget :buttons))
|
||
(widget-mouse-face (default-value 'widget-mouse-face))
|
||
(widget-button-face widget-documentation-face)
|
||
(widget-button-pressed-face widget-documentation-face))
|
||
(save-excursion
|
||
(goto-char from)
|
||
(while (re-search-forward regexp to t)
|
||
(let ((name (match-string 1))
|
||
(begin (match-beginning 1))
|
||
(end (match-end 1)))
|
||
(when (funcall widget-documentation-link-p name)
|
||
(push (widget-convert-button widget-documentation-link-type
|
||
begin end :value name)
|
||
buttons)))))
|
||
(widget-put widget :buttons buttons)))
|
||
(let ((indent (widget-get widget :indent)))
|
||
(when (and indent (not (zerop indent)))
|
||
(save-excursion
|
||
(save-restriction
|
||
(narrow-to-region from to)
|
||
(goto-char (point-min))
|
||
(while (search-forward "\n" nil t)
|
||
(insert-char ?\s indent)))))))
|
||
|
||
;;; The `documentation-string' Widget.
|
||
|
||
(define-widget 'documentation-string 'item
|
||
"A documentation string."
|
||
:format "%v"
|
||
:action 'widget-documentation-string-action
|
||
:value-create 'widget-documentation-string-value-create
|
||
:visibility-widget 'visibility)
|
||
|
||
(defun widget-documentation-string-value-create (widget)
|
||
;; Insert documentation string.
|
||
(let ((doc (widget-value widget))
|
||
(indent (widget-get widget :indent))
|
||
(shown (widget-get (widget-get widget :parent) :documentation-shown))
|
||
(start (point)))
|
||
(if (string-match "\n" doc)
|
||
(let ((before (substring doc 0 (match-beginning 0)))
|
||
(after (substring doc (match-beginning 0)))
|
||
button)
|
||
(when (and indent (not (zerop indent)))
|
||
(insert-char ?\s indent))
|
||
(insert before ?\s)
|
||
(widget-documentation-link-add widget start (point))
|
||
(setq button
|
||
(widget-create-child-and-convert
|
||
widget (widget-get widget :visibility-widget)
|
||
:help-echo "Show or hide rest of the documentation."
|
||
:on "Hide Rest"
|
||
:off "More"
|
||
:always-active t
|
||
:action 'widget-parent-action
|
||
shown))
|
||
(when shown
|
||
(setq start (point))
|
||
(when (and indent (not (zerop indent)))
|
||
(insert-char ?\s indent))
|
||
(insert after)
|
||
(widget-documentation-link-add widget start (point)))
|
||
(widget-put widget :buttons (list button)))
|
||
(when (and indent (not (zerop indent)))
|
||
(insert-char ?\s indent))
|
||
(insert doc)
|
||
(widget-documentation-link-add widget start (point))))
|
||
(insert ?\n))
|
||
|
||
(defun widget-documentation-string-action (widget &rest ignore)
|
||
;; Toggle documentation.
|
||
(let ((parent (widget-get widget :parent)))
|
||
(widget-put parent :documentation-shown
|
||
(not (widget-get parent :documentation-shown))))
|
||
;; Redraw.
|
||
(widget-value-set widget (widget-value widget)))
|
||
|
||
(defun widget-add-documentation-string-button (widget &rest args)
|
||
"Insert a new `documentation-string' widget based on WIDGET.
|
||
The new widget becomes a child of WIDGET, and is also added to
|
||
its `:buttons' list. The documentation string is found from
|
||
WIDGET using the function `widget-docstring'.
|
||
Optional ARGS specifies additional keyword arguments for the
|
||
`documentation-string' widget."
|
||
(let ((doc (widget-docstring widget))
|
||
(indent (widget-get widget :indent))
|
||
(doc-indent (widget-get widget :documentation-indent)))
|
||
(when doc
|
||
(and (eq (preceding-char) ?\n)
|
||
indent
|
||
(insert-char ?\s indent))
|
||
(unless (or (numberp doc-indent) (null doc-indent))
|
||
(setq doc-indent 0))
|
||
(widget-put widget :buttons
|
||
(cons (apply 'widget-create-child-and-convert
|
||
widget 'documentation-string
|
||
:indent doc-indent
|
||
(nconc args (list doc)))
|
||
(widget-get widget :buttons))))))
|
||
|
||
;;; The Sexp Widgets.
|
||
|
||
(define-widget 'const 'item
|
||
"An immutable sexp."
|
||
:prompt-value 'widget-const-prompt-value
|
||
:format "%t\n%d")
|
||
|
||
(defun widget-const-prompt-value (widget prompt value unbound)
|
||
;; Return the value of the const.
|
||
(widget-value widget))
|
||
|
||
(define-widget 'function-item 'const
|
||
"An immutable function name."
|
||
:format "%v\n%h"
|
||
:documentation-property (lambda (symbol)
|
||
(condition-case nil
|
||
(documentation symbol t)
|
||
(error nil))))
|
||
|
||
(define-widget 'variable-item 'const
|
||
"An immutable variable name."
|
||
:format "%v\n%h"
|
||
:documentation-property 'variable-documentation)
|
||
|
||
(define-widget 'other 'sexp
|
||
"Matches any value, but doesn't let the user edit the value.
|
||
This is useful as last item in a `choice' widget.
|
||
You should use this widget type with a default value,
|
||
as in (other DEFAULT) or (other :tag \"NAME\" DEFAULT).
|
||
If the user selects this alternative, that specifies DEFAULT
|
||
as the value."
|
||
:tag "Other"
|
||
:format "%t%n"
|
||
:value 'other)
|
||
|
||
(defvar widget-string-prompt-value-history nil
|
||
"History of input to `widget-string-prompt-value'.")
|
||
|
||
(define-widget 'string 'editable-field
|
||
"A string"
|
||
:tag "String"
|
||
:format "%{%t%}: %v"
|
||
:complete-function 'ispell-complete-word
|
||
:prompt-history 'widget-string-prompt-value-history)
|
||
|
||
(defvar widget)
|
||
|
||
(defun widget-string-complete ()
|
||
"Complete contents of string field.
|
||
Completions are taken from the :completion-alist property of the
|
||
widget. If that isn't a list, it's evalled and expected to yield a list."
|
||
(interactive)
|
||
(let* ((completion-ignore-case (widget-get widget :completion-ignore-case))
|
||
(alist (widget-get widget :completion-alist))
|
||
(_ (unless (listp alist)
|
||
(setq alist (eval alist)))))
|
||
(completion-in-region (widget-field-start widget)
|
||
(max (point) (widget-field-text-end widget))
|
||
alist)))
|
||
|
||
(define-widget 'regexp 'string
|
||
"A regular expression."
|
||
:match 'widget-regexp-match
|
||
:validate 'widget-regexp-validate
|
||
;; Doesn't work well with terminating newline.
|
||
;; :value-face 'widget-single-line-field
|
||
:tag "Regexp")
|
||
|
||
(defun widget-regexp-match (widget value)
|
||
;; Match valid regexps.
|
||
(and (stringp value)
|
||
(condition-case nil
|
||
(prog1 t
|
||
(string-match value ""))
|
||
(error nil))))
|
||
|
||
(defun widget-regexp-validate (widget)
|
||
"Check that the value of WIDGET is a valid regexp."
|
||
(condition-case data
|
||
(prog1 nil
|
||
(string-match (widget-value widget) ""))
|
||
(error (widget-put widget :error (error-message-string data))
|
||
widget)))
|
||
|
||
(define-widget 'file 'string
|
||
"A file widget.
|
||
It reads a file name from an editable text field."
|
||
:complete-function 'widget-file-complete
|
||
:prompt-value 'widget-file-prompt-value
|
||
:format "%{%t%}: %v"
|
||
;; Doesn't work well with terminating newline.
|
||
;; :value-face 'widget-single-line-field
|
||
:tag "File")
|
||
|
||
(defun widget-file-complete ()
|
||
"Perform completion on file name preceding point."
|
||
(interactive)
|
||
(completion-in-region (widget-field-start widget)
|
||
(max (point) (widget-field-text-end widget))
|
||
'completion-file-name-table))
|
||
|
||
(defun widget-file-prompt-value (widget prompt value unbound)
|
||
;; Read file from minibuffer.
|
||
(abbreviate-file-name
|
||
(if unbound
|
||
(read-file-name prompt)
|
||
(let ((prompt2 (format "%s (default %s): " prompt value))
|
||
(dir (file-name-directory value))
|
||
(file (file-name-nondirectory value))
|
||
(must-match (widget-get widget :must-match)))
|
||
(read-file-name prompt2 dir nil must-match file)))))
|
||
|
||
;;;(defun widget-file-action (widget &optional event)
|
||
;;; ;; Read a file name from the minibuffer.
|
||
;;; (let* ((value (widget-value widget))
|
||
;;; (dir (file-name-directory value))
|
||
;;; (file (file-name-nondirectory value))
|
||
;;; (menu-tag (widget-apply widget :menu-tag-get))
|
||
;;; (must-match (widget-get widget :must-match))
|
||
;;; (answer (read-file-name (concat menu-tag " (default " value "): ")
|
||
;;; dir nil must-match file)))
|
||
;;; (widget-value-set widget (abbreviate-file-name answer))
|
||
;;; (widget-setup)
|
||
;;; (widget-apply widget :notify widget event)))
|
||
|
||
;; Fixme: use file-name-as-directory.
|
||
(define-widget 'directory 'file
|
||
"A directory widget.
|
||
It reads a directory name from an editable text field."
|
||
:tag "Directory")
|
||
|
||
(defvar widget-symbol-prompt-value-history nil
|
||
"History of input to `widget-symbol-prompt-value'.")
|
||
|
||
(define-widget 'symbol 'editable-field
|
||
"A Lisp symbol."
|
||
:value nil
|
||
:tag "Symbol"
|
||
:format "%{%t%}: %v"
|
||
:match (lambda (widget value) (symbolp value))
|
||
:complete-function 'lisp-complete-symbol
|
||
:prompt-internal 'widget-symbol-prompt-internal
|
||
:prompt-match 'symbolp
|
||
:prompt-history 'widget-symbol-prompt-value-history
|
||
:value-to-internal (lambda (widget value)
|
||
(if (symbolp value)
|
||
(symbol-name value)
|
||
value))
|
||
:value-to-external (lambda (widget value)
|
||
(if (stringp value)
|
||
(intern value)
|
||
value)))
|
||
|
||
(defun widget-symbol-prompt-internal (widget prompt initial history)
|
||
;; Read file from minibuffer.
|
||
(let ((answer (completing-read prompt obarray
|
||
(widget-get widget :prompt-match)
|
||
nil initial history)))
|
||
(if (and (stringp answer)
|
||
(not (zerop (length answer))))
|
||
answer
|
||
(error "No value"))))
|
||
|
||
(defvar widget-function-prompt-value-history nil
|
||
"History of input to `widget-function-prompt-value'.")
|
||
|
||
(define-widget 'function 'restricted-sexp
|
||
"A Lisp function."
|
||
:complete-function (lambda ()
|
||
(interactive)
|
||
(lisp-complete-symbol 'fboundp))
|
||
:prompt-value 'widget-field-prompt-value
|
||
:prompt-internal 'widget-symbol-prompt-internal
|
||
:prompt-match 'fboundp
|
||
:prompt-history 'widget-function-prompt-value-history
|
||
:action 'widget-field-action
|
||
:match-alternatives '(functionp)
|
||
:validate (lambda (widget)
|
||
(unless (functionp (widget-value widget))
|
||
(widget-put widget :error (format "Invalid function: %S"
|
||
(widget-value widget)))
|
||
widget))
|
||
:value 'ignore
|
||
:tag "Function")
|
||
|
||
(defvar widget-variable-prompt-value-history nil
|
||
"History of input to `widget-variable-prompt-value'.")
|
||
|
||
(define-widget 'variable 'symbol
|
||
"A Lisp variable."
|
||
:prompt-match 'boundp
|
||
:prompt-history 'widget-variable-prompt-value-history
|
||
:complete-function (lambda ()
|
||
(interactive)
|
||
(lisp-complete-symbol 'boundp))
|
||
:tag "Variable")
|
||
|
||
(define-widget 'coding-system 'symbol
|
||
"A MULE coding-system."
|
||
:format "%{%t%}: %v"
|
||
:tag "Coding system"
|
||
:base-only nil
|
||
:prompt-history 'coding-system-value-history
|
||
:prompt-value 'widget-coding-system-prompt-value
|
||
:action 'widget-coding-system-action
|
||
:complete-function (lambda ()
|
||
(interactive)
|
||
(lisp-complete-symbol 'coding-system-p))
|
||
:validate (lambda (widget)
|
||
(unless (coding-system-p (widget-value widget))
|
||
(widget-put widget :error (format "Invalid coding system: %S"
|
||
(widget-value widget)))
|
||
widget))
|
||
:value 'undecided
|
||
:prompt-match 'coding-system-p)
|
||
|
||
(defun widget-coding-system-prompt-value (widget prompt value unbound)
|
||
"Read coding-system from minibuffer."
|
||
(if (widget-get widget :base-only)
|
||
(intern
|
||
(completing-read (format "%s (default %s): " prompt value)
|
||
(mapcar #'list (coding-system-list t)) nil nil nil
|
||
coding-system-history))
|
||
(read-coding-system (format "%s (default %s): " prompt value) value)))
|
||
|
||
(defun widget-coding-system-action (widget &optional event)
|
||
(let ((answer
|
||
(widget-coding-system-prompt-value
|
||
widget
|
||
(widget-apply widget :menu-tag-get)
|
||
(widget-value widget)
|
||
t)))
|
||
(widget-value-set widget answer)
|
||
(widget-apply widget :notify widget event)
|
||
(widget-setup)))
|
||
|
||
;;; I'm not sure about what this is good for? KFS.
|
||
(defvar widget-key-sequence-prompt-value-history nil
|
||
"History of input to `widget-key-sequence-prompt-value'.")
|
||
|
||
(defvar widget-key-sequence-default-value [ignore]
|
||
"Default value for an empty key sequence.")
|
||
|
||
(defvar widget-key-sequence-map
|
||
(let ((map (make-sparse-keymap)))
|
||
(set-keymap-parent map widget-field-keymap)
|
||
(define-key map [(control ?q)] 'widget-key-sequence-read-event)
|
||
map))
|
||
|
||
(define-widget 'key-sequence 'restricted-sexp
|
||
"A key sequence."
|
||
:prompt-value 'widget-field-prompt-value
|
||
:prompt-internal 'widget-symbol-prompt-internal
|
||
; :prompt-match 'fboundp ;; What was this good for? KFS
|
||
:prompt-history 'widget-key-sequence-prompt-value-history
|
||
:action 'widget-field-action
|
||
:match-alternatives '(stringp vectorp)
|
||
:format "%{%t%}: %v"
|
||
:validate 'widget-key-sequence-validate
|
||
:value-to-internal 'widget-key-sequence-value-to-internal
|
||
:value-to-external 'widget-key-sequence-value-to-external
|
||
:value widget-key-sequence-default-value
|
||
:keymap widget-key-sequence-map
|
||
:help-echo "C-q: insert KEY, EVENT, or CODE; RET: enter value"
|
||
:tag "Key sequence")
|
||
|
||
(defun widget-key-sequence-read-event (ev)
|
||
(interactive (list
|
||
(let ((inhibit-quit t) quit-flag)
|
||
(read-event "Insert KEY, EVENT, or CODE: "))))
|
||
(let ((ev2 (and (memq 'down (event-modifiers ev))
|
||
(read-event)))
|
||
(tr (and (keymapp function-key-map)
|
||
(lookup-key function-key-map (vector ev)))))
|
||
(when (and (integerp ev)
|
||
(or (and (<= ?0 ev) (< ev (+ ?0 (min 10 read-quoted-char-radix))))
|
||
(and (<= ?a (downcase ev))
|
||
(< (downcase ev) (+ ?a -10 (min 36 read-quoted-char-radix))))))
|
||
(setq unread-command-events (cons ev unread-command-events)
|
||
ev (read-quoted-char (format "Enter code (radix %d)" read-quoted-char-radix))
|
||
tr nil)
|
||
(if (and (integerp ev) (not (characterp ev)))
|
||
(insert (char-to-string ev)))) ;; throw invalid char error
|
||
(setq ev (key-description (list ev)))
|
||
(when (arrayp tr)
|
||
(setq tr (key-description (list (aref tr 0))))
|
||
(if (y-or-n-p (format "Key %s is translated to %s -- use %s? " ev tr tr))
|
||
(setq ev tr ev2 nil)))
|
||
(insert (if (= (char-before) ?\s) "" " ") ev " ")
|
||
(if ev2
|
||
(insert (key-description (list ev2)) " "))))
|
||
|
||
(defun widget-key-sequence-validate (widget)
|
||
(unless (or (stringp (widget-value widget))
|
||
(vectorp (widget-value widget)))
|
||
(widget-put widget :error (format "Invalid key sequence: %S"
|
||
(widget-value widget)))
|
||
widget))
|
||
|
||
(defun widget-key-sequence-value-to-internal (widget value)
|
||
(if (widget-apply widget :match value)
|
||
(if (equal value widget-key-sequence-default-value)
|
||
""
|
||
(key-description value))
|
||
value))
|
||
|
||
(defun widget-key-sequence-value-to-external (widget value)
|
||
(if (stringp value)
|
||
(if (string-match "\\`[[:space:]]*\\'" value)
|
||
widget-key-sequence-default-value
|
||
(read-kbd-macro value))
|
||
value))
|
||
|
||
|
||
(define-widget 'sexp 'editable-field
|
||
"An arbitrary Lisp expression."
|
||
:tag "Lisp expression"
|
||
:format "%{%t%}: %v"
|
||
:value nil
|
||
:validate 'widget-sexp-validate
|
||
:match (lambda (widget value) t)
|
||
:value-to-internal 'widget-sexp-value-to-internal
|
||
:value-to-external (lambda (widget value) (read value))
|
||
:prompt-history 'widget-sexp-prompt-value-history
|
||
:prompt-value 'widget-sexp-prompt-value)
|
||
|
||
(defun widget-sexp-value-to-internal (widget value)
|
||
;; Use pp for printer representation.
|
||
(let ((pp (if (symbolp value)
|
||
(prin1-to-string value)
|
||
(pp-to-string value))))
|
||
(while (string-match "\n\\'" pp)
|
||
(setq pp (substring pp 0 -1)))
|
||
(if (or (string-match "\n\\'" pp)
|
||
(> (length pp) 40))
|
||
(concat "\n" pp)
|
||
pp)))
|
||
|
||
(defun widget-sexp-validate (widget)
|
||
;; Valid if we can read the string and there is no junk left after it.
|
||
(with-temp-buffer
|
||
(insert (widget-apply widget :value-get))
|
||
(goto-char (point-min))
|
||
(let (err)
|
||
(condition-case data
|
||
(progn
|
||
;; Avoid a confusing end-of-file error.
|
||
(skip-syntax-forward "\\s-")
|
||
(if (eobp)
|
||
(setq err "Empty sexp -- use `nil'?")
|
||
(unless (widget-apply widget :match (read (current-buffer)))
|
||
(setq err (widget-get widget :type-error))))
|
||
;; Allow whitespace after expression.
|
||
(skip-syntax-forward "\\s-")
|
||
(if (and (not (eobp))
|
||
(not err))
|
||
(setq err (format "Junk at end of expression: %s"
|
||
(buffer-substring (point)
|
||
(point-max))))))
|
||
(end-of-file ; Avoid confusing error message.
|
||
(setq err "Unbalanced sexp"))
|
||
(error (setq err (error-message-string data))))
|
||
(if (not err)
|
||
nil
|
||
(widget-put widget :error err)
|
||
widget))))
|
||
|
||
(defvar widget-sexp-prompt-value-history nil
|
||
"History of input to `widget-sexp-prompt-value'.")
|
||
|
||
(defun widget-sexp-prompt-value (widget prompt value unbound)
|
||
;; Read an arbitrary sexp.
|
||
(let ((found (read-string prompt
|
||
(if unbound nil (cons (prin1-to-string value) 0))
|
||
(widget-get widget :prompt-history))))
|
||
(let ((answer (read-from-string found)))
|
||
(unless (= (cdr answer) (length found))
|
||
(error "Junk at end of expression: %s"
|
||
(substring found (cdr answer))))
|
||
(car answer))))
|
||
|
||
(define-widget 'restricted-sexp 'sexp
|
||
"A Lisp expression restricted to values that match.
|
||
To use this type, you must define :match or :match-alternatives."
|
||
:type-error "The specified value is not valid"
|
||
:match 'widget-restricted-sexp-match
|
||
:value-to-internal (lambda (widget value)
|
||
(if (widget-apply widget :match value)
|
||
(prin1-to-string value)
|
||
value)))
|
||
|
||
(defun widget-restricted-sexp-match (widget value)
|
||
(let ((alternatives (widget-get widget :match-alternatives))
|
||
matched)
|
||
(while (and alternatives (not matched))
|
||
(if (cond ((functionp (car alternatives))
|
||
(funcall (car alternatives) value))
|
||
((and (consp (car alternatives))
|
||
(eq (car (car alternatives)) 'quote))
|
||
(eq value (nth 1 (car alternatives)))))
|
||
(setq matched t))
|
||
(setq alternatives (cdr alternatives)))
|
||
matched))
|
||
|
||
(define-widget 'integer 'restricted-sexp
|
||
"An integer."
|
||
:tag "Integer"
|
||
:value 0
|
||
:type-error "This field should contain an integer"
|
||
:match-alternatives '(integerp))
|
||
|
||
(define-widget 'number 'restricted-sexp
|
||
"A number (floating point or integer)."
|
||
:tag "Number"
|
||
:value 0.0
|
||
:type-error "This field should contain a number (floating point or integer)"
|
||
:match-alternatives '(numberp))
|
||
|
||
(define-widget 'float 'restricted-sexp
|
||
"A floating point number."
|
||
:tag "Floating point number"
|
||
:value 0.0
|
||
:type-error "This field should contain a floating point number"
|
||
:match-alternatives '(floatp))
|
||
|
||
(define-widget 'character 'editable-field
|
||
"A character."
|
||
:tag "Character"
|
||
:value 0
|
||
:size 1
|
||
:format "%{%t%}: %v\n"
|
||
:valid-regexp "\\`.\\'"
|
||
:error "This field should contain a single character"
|
||
:value-to-internal (lambda (widget value)
|
||
(if (stringp value)
|
||
value
|
||
(char-to-string value)))
|
||
:value-to-external (lambda (widget value)
|
||
(if (stringp value)
|
||
(aref value 0)
|
||
value))
|
||
:match (lambda (widget value)
|
||
(characterp value)))
|
||
|
||
(define-widget 'list 'group
|
||
"A Lisp list."
|
||
:tag "List"
|
||
:format "%{%t%}:\n%v")
|
||
|
||
(define-widget 'vector 'group
|
||
"A Lisp vector."
|
||
:tag "Vector"
|
||
:format "%{%t%}:\n%v"
|
||
:match 'widget-vector-match
|
||
:value-to-internal (lambda (widget value) (append value nil))
|
||
:value-to-external (lambda (widget value) (apply 'vector value)))
|
||
|
||
(defun widget-vector-match (widget value)
|
||
(and (vectorp value)
|
||
(widget-group-match widget
|
||
(widget-apply widget :value-to-internal value))))
|
||
|
||
(define-widget 'cons 'group
|
||
"A cons-cell."
|
||
:tag "Cons-cell"
|
||
:format "%{%t%}:\n%v"
|
||
:match 'widget-cons-match
|
||
:value-to-internal (lambda (widget value)
|
||
(list (car value) (cdr value)))
|
||
:value-to-external (lambda (widget value)
|
||
(apply 'cons value)))
|
||
|
||
(defun widget-cons-match (widget value)
|
||
(and (consp value)
|
||
(widget-group-match widget
|
||
(widget-apply widget :value-to-internal value))))
|
||
|
||
;;; The `lazy' Widget.
|
||
;;
|
||
;; Recursive datatypes.
|
||
|
||
(define-widget 'lazy 'default
|
||
"Base widget for recursive datastructures.
|
||
|
||
The `lazy' widget will, when instantiated, contain a single inferior
|
||
widget, of the widget type specified by the :type parameter. The
|
||
value of the `lazy' widget is the same as the value of the inferior
|
||
widget. When deriving a new widget from the 'lazy' widget, the :type
|
||
parameter is allowed to refer to the widget currently being defined,
|
||
thus allowing recursive datastructures to be described.
|
||
|
||
The :type parameter takes the same arguments as the defcustom
|
||
parameter with the same name.
|
||
|
||
Most composite widgets, i.e. widgets containing other widgets, does
|
||
not allow recursion. That is, when you define a new widget type, none
|
||
of the inferior widgets may be of the same type you are currently
|
||
defining.
|
||
|
||
In Lisp, however, it is custom to define datastructures in terms of
|
||
themselves. A list, for example, is defined as either nil, or a cons
|
||
cell whose cdr itself is a list. The obvious way to translate this
|
||
into a widget type would be
|
||
|
||
(define-widget 'my-list 'choice
|
||
\"A list of sexps.\"
|
||
:tag \"Sexp list\"
|
||
:args '((const nil) (cons :value (nil) sexp my-list)))
|
||
|
||
Here we attempt to define my-list as a choice of either the constant
|
||
nil, or a cons-cell containing a sexp and my-lisp. This will not work
|
||
because the `choice' widget does not allow recursion.
|
||
|
||
Using the `lazy' widget you can overcome this problem, as in this
|
||
example:
|
||
|
||
(define-widget 'sexp-list 'lazy
|
||
\"A list of sexps.\"
|
||
:tag \"Sexp list\"
|
||
:type '(choice (const nil) (cons :value (nil) sexp sexp-list)))"
|
||
:format "%{%t%}: %v"
|
||
;; We don't convert :type because we want to allow recursive
|
||
;; datastructures. This is slow, so we should not create speed
|
||
;; critical widgets by deriving from this.
|
||
:convert-widget 'widget-value-convert-widget
|
||
:value-create 'widget-type-value-create
|
||
:value-get 'widget-child-value-get
|
||
:value-inline 'widget-child-value-inline
|
||
:default-get 'widget-type-default-get
|
||
:match 'widget-type-match
|
||
:validate 'widget-child-validate)
|
||
|
||
|
||
;;; The `plist' Widget.
|
||
;;
|
||
;; Property lists.
|
||
|
||
(define-widget 'plist 'list
|
||
"A property list."
|
||
:key-type '(symbol :tag "Key")
|
||
:value-type '(sexp :tag "Value")
|
||
:convert-widget 'widget-plist-convert-widget
|
||
:tag "Plist")
|
||
|
||
(defvar widget-plist-value-type) ;Dynamic variable
|
||
|
||
(defun widget-plist-convert-widget (widget)
|
||
;; Handle `:options'.
|
||
(let* ((options (widget-get widget :options))
|
||
(widget-plist-value-type (widget-get widget :value-type))
|
||
(other `(editable-list :inline t
|
||
(group :inline t
|
||
,(widget-get widget :key-type)
|
||
,widget-plist-value-type)))
|
||
(args (if options
|
||
(list `(checklist :inline t
|
||
:greedy t
|
||
,@(mapcar 'widget-plist-convert-option
|
||
options))
|
||
other)
|
||
(list other))))
|
||
(widget-put widget :args args)
|
||
widget))
|
||
|
||
(defun widget-plist-convert-option (option)
|
||
;; Convert a single plist option.
|
||
(let (key-type value-type)
|
||
(if (listp option)
|
||
(let ((key (nth 0 option)))
|
||
(setq value-type (nth 1 option))
|
||
(if (listp key)
|
||
(setq key-type key)
|
||
(setq key-type `(const ,key))))
|
||
(setq key-type `(const ,option)
|
||
value-type widget-plist-value-type))
|
||
`(group :format "Key: %v" :inline t ,key-type ,value-type)))
|
||
|
||
|
||
;;; The `alist' Widget.
|
||
;;
|
||
;; Association lists.
|
||
|
||
(define-widget 'alist 'list
|
||
"An association list."
|
||
:key-type '(sexp :tag "Key")
|
||
:value-type '(sexp :tag "Value")
|
||
:convert-widget 'widget-alist-convert-widget
|
||
:tag "Alist")
|
||
|
||
(defvar widget-alist-value-type) ;Dynamic variable
|
||
|
||
(defun widget-alist-convert-widget (widget)
|
||
;; Handle `:options'.
|
||
(let* ((options (widget-get widget :options))
|
||
(widget-alist-value-type (widget-get widget :value-type))
|
||
(other `(editable-list :inline t
|
||
(cons :format "%v"
|
||
,(widget-get widget :key-type)
|
||
,widget-alist-value-type)))
|
||
(args (if options
|
||
(list `(checklist :inline t
|
||
:greedy t
|
||
,@(mapcar 'widget-alist-convert-option
|
||
options))
|
||
other)
|
||
(list other))))
|
||
(widget-put widget :args args)
|
||
widget))
|
||
|
||
(defun widget-alist-convert-option (option)
|
||
;; Convert a single alist option.
|
||
(let (key-type value-type)
|
||
(if (listp option)
|
||
(let ((key (nth 0 option)))
|
||
(setq value-type (nth 1 option))
|
||
(if (listp key)
|
||
(setq key-type key)
|
||
(setq key-type `(const ,key))))
|
||
(setq key-type `(const ,option)
|
||
value-type widget-alist-value-type))
|
||
`(cons :format "Key: %v" ,key-type ,value-type)))
|
||
|
||
(define-widget 'choice 'menu-choice
|
||
"A union of several sexp types."
|
||
:tag "Choice"
|
||
:format "%{%t%}: %[Value Menu%] %v"
|
||
:button-prefix 'widget-push-button-prefix
|
||
:button-suffix 'widget-push-button-suffix
|
||
:prompt-value 'widget-choice-prompt-value)
|
||
|
||
(defun widget-choice-prompt-value (widget prompt value unbound)
|
||
"Make a choice."
|
||
(let ((args (widget-get widget :args))
|
||
(completion-ignore-case (widget-get widget :case-fold))
|
||
current choices old)
|
||
;; Find the first arg that matches VALUE.
|
||
(let ((look args))
|
||
(while look
|
||
(if (widget-apply (car look) :match value)
|
||
(setq old (car look)
|
||
look nil)
|
||
(setq look (cdr look)))))
|
||
;; Find new choice.
|
||
(setq current
|
||
(cond ((= (length args) 0)
|
||
nil)
|
||
((= (length args) 1)
|
||
(nth 0 args))
|
||
((and (= (length args) 2)
|
||
(memq old args))
|
||
(if (eq old (nth 0 args))
|
||
(nth 1 args)
|
||
(nth 0 args)))
|
||
(t
|
||
(while args
|
||
(setq current (car args)
|
||
args (cdr args))
|
||
(setq choices
|
||
(cons (cons (widget-apply current :menu-tag-get)
|
||
current)
|
||
choices)))
|
||
(let ((val (completing-read prompt choices nil t)))
|
||
(if (stringp val)
|
||
(let ((try (try-completion val choices)))
|
||
(when (stringp try)
|
||
(setq val try))
|
||
(cdr (assoc val choices)))
|
||
nil)))))
|
||
(if current
|
||
(widget-prompt-value current prompt nil t)
|
||
value)))
|
||
|
||
(define-widget 'radio 'radio-button-choice
|
||
"A union of several sexp types."
|
||
:tag "Choice"
|
||
:format "%{%t%}:\n%v"
|
||
:prompt-value 'widget-choice-prompt-value)
|
||
|
||
(define-widget 'repeat 'editable-list
|
||
"A variable length homogeneous list."
|
||
:tag "Repeat"
|
||
:format "%{%t%}:\n%v%i\n")
|
||
|
||
(define-widget 'set 'checklist
|
||
"A list of members from a fixed set."
|
||
:tag "Set"
|
||
:format "%{%t%}:\n%v")
|
||
|
||
(define-widget 'boolean 'toggle
|
||
"To be nil or non-nil, that is the question."
|
||
:tag "Boolean"
|
||
:prompt-value 'widget-boolean-prompt-value
|
||
:button-prefix 'widget-push-button-prefix
|
||
:button-suffix 'widget-push-button-suffix
|
||
:format "%{%t%}: %[Toggle%] %v\n"
|
||
:on "on (non-nil)"
|
||
:off "off (nil)")
|
||
|
||
(defun widget-boolean-prompt-value (widget prompt value unbound)
|
||
;; Toggle a boolean.
|
||
(y-or-n-p prompt))
|
||
|
||
;;; The `color' Widget.
|
||
|
||
;; Fixme: match
|
||
(define-widget 'color 'editable-field
|
||
"Choose a color name (with sample)."
|
||
:format "%{%t%}: %v (%{sample%})\n"
|
||
:size 10
|
||
:tag "Color"
|
||
:value "black"
|
||
:complete 'widget-color-complete
|
||
:sample-face-get 'widget-color-sample-face-get
|
||
:notify 'widget-color-notify
|
||
:action 'widget-color-action)
|
||
|
||
(defun widget-color-complete (widget)
|
||
"Complete the color in WIDGET."
|
||
(require 'facemenu) ; for facemenu-color-alist
|
||
(completion-in-region (widget-field-start widget)
|
||
(max (point) (widget-field-text-end widget))
|
||
(or facemenu-color-alist
|
||
(sort (defined-colors) 'string-lessp))))
|
||
|
||
(defun widget-color-sample-face-get (widget)
|
||
(let* ((value (condition-case nil
|
||
(widget-value widget)
|
||
(error (widget-get widget :value)))))
|
||
(if (color-defined-p value)
|
||
(list (cons 'foreground-color value))
|
||
'default)))
|
||
|
||
(defun widget-color-action (widget &optional event)
|
||
"Prompt for a color."
|
||
(let* ((tag (widget-apply widget :menu-tag-get))
|
||
(prompt (concat tag ": "))
|
||
(value (widget-value widget))
|
||
(start (widget-field-start widget))
|
||
(answer (facemenu-read-color prompt)))
|
||
(unless (zerop (length answer))
|
||
(widget-value-set widget answer)
|
||
(widget-setup)
|
||
(widget-apply widget :notify widget event))))
|
||
|
||
(defun widget-color-notify (widget child &optional event)
|
||
"Update the sample, and notify the parent."
|
||
(overlay-put (widget-get widget :sample-overlay)
|
||
'face (widget-apply widget :sample-face-get))
|
||
(widget-default-notify widget child event))
|
||
|
||
;;; The Help Echo
|
||
|
||
(defun widget-echo-help (pos)
|
||
"Display help-echo text for widget at POS."
|
||
(let* ((widget (widget-at pos))
|
||
(help-echo (and widget (widget-get widget :help-echo))))
|
||
(if (functionp help-echo)
|
||
(setq help-echo (funcall help-echo widget)))
|
||
(if help-echo (message "%s" (eval help-echo)))))
|
||
|
||
;;; The End:
|
||
|
||
(provide 'wid-edit)
|
||
|
||
;; arch-tag: a076e75e-18a1-4b46-8be5-3f317bcbc707
|
||
;;; wid-edit.el ends here
|