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1 | ;;; easy-mmode.el --- easy definition of minor modes. |
2 | ||
3 | ;; Copyright (C) 1997 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Georges Brun-Cottan <Georges.Brun-Cottan@inria.fr> | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;; Minor modes are useful and common. This package makes defining a | |
27 | ;; minor mode easy, by focusing on the writing of the minor mode | |
28 | ;; functionalities themselves. Moreover, this package enforces a | |
29 | ;; conventional naming of user interface primitives, making things | |
30 | ;; natural for the minor-mode end-users. | |
31 | ||
32 | ;; For each mode, easy-mmode defines the following: | |
33 | ;; <mode> : The minor mode predicate. A buffer-local variable. | |
34 | ;; <mode>-map : The keymap possibly associated to <mode>. | |
35 | ;; <mode>-hook,<mode>-on-hook,<mode>-off-hook and <mode>-mode: | |
36 | ;; see `easy-mmode-define-minor-mode' documentation | |
37 | ;; | |
38 | ;; eval | |
39 | ;; (pp (macroexpand '(easy-mmode-define-minor-mode <your-mode> <doc>))) | |
40 | ;; to check the result before using it. | |
41 | ||
42 | ;; The order in which minor modes are installed is important. Keymap | |
43 | ;; lookup proceeds down minor-mode-map-alist, and the order there | |
44 | ;; tends to be the reverse of the order in which the modes were | |
45 | ;; installed. Perhaps there should be a feature to let you specify | |
46 | ;; orderings. | |
47 | ||
48 | ;;; Code: | |
49 | ||
50 | (defun easy-mmode-define-keymap (keymap-alist &optional menu-name) | |
51 | "Return a keymap builded from KEYMAP-ALIST. | |
52 | KEYMAP-ALIST must be a list of (KEYBINDING . BINDING) where | |
53 | KEYBINDING and BINDINGS are suited as for define-key. | |
54 | optional MENU-NAME is passed to `make-sparse-keymap'." | |
55 | (let ((keymap (make-sparse-keymap menu-name))) | |
56 | (mapcar | |
57 | (function (lambda (bind) | |
58 | (define-key keymap | |
59 | (car bind) (cdr bind)))) | |
60 | keymap-alist) | |
61 | keymap)) | |
62 | ||
63 | (defmacro easy-mmode-define-toggle (mode &optional doc) | |
64 | "Define a one arg toggle mode MODE function and associated hooks. | |
65 | MODE-mode is the so defined function that toggle the mode. | |
66 | optional DOC is its associated documentation. | |
67 | ||
68 | Hooks are checked for run, each time MODE-mode is called. | |
69 | They run under the followings conditions: | |
70 | MODE-hook: if the mode is toggled. | |
71 | MODE-on-hook: if the mode is on. | |
72 | MODE-off-hook: if the mode is off. | |
73 | ||
74 | When the mode is effectively toggled, two hooks may run. | |
75 | If so MODE-hook is guaranteed to be the first. | |
76 | ||
77 | \(defmacro easy-mmode-define-toggle (MODE &optional DOC)" | |
78 | (let* ((mode-name | |
79 | (if (string-match "-mode\\'" (symbol-name mode)) | |
80 | (symbol-name mode) | |
81 | (concat (symbol-name mode) "-mode"))) | |
82 | (hook (intern (concat mode-name "-hook"))) | |
83 | (hook-on (intern (concat mode-name "-on-hook"))) | |
84 | (hook-off (intern (concat mode-name "-off-hook"))) | |
85 | (toggle (intern mode-name)) | |
86 | (mode toggle) | |
87 | (toggle-doc (or doc | |
88 | (format "With no argument, toggle %s mode. | |
89 | With arg turn mode on. | |
90 | With zero or negative arg turn mode off" | |
91 | mode-name)))) | |
92 | `(progn | |
93 | (defvar ,hook nil | |
94 | ,(format "Hook called when %s mode is toggled" mode-name)) | |
95 | ||
96 | (defvar ,hook-on nil | |
97 | ,(format "Hook called when %s mode is turned on" mode-name)) | |
98 | ||
99 | (defvar ,hook-off nil | |
100 | ,(format "Hook called when %s mode is turned off" mode-name)) | |
101 | ||
102 | (defun ,toggle (&optional arg) | |
103 | ,toggle-doc | |
104 | (interactive "P") | |
105 | (let ((old-mode ,mode)) | |
106 | (setq ,mode | |
107 | (if arg | |
108 | (or (listp arg);; C-u alone | |
109 | (> (prefix-numeric-value arg) 0)) | |
110 | (not ,mode))) | |
111 | (and ,hook | |
112 | (not (equal old-mode ,mode)) | |
113 | (run-hooks ',hook)) | |
114 | (and ,hook-on | |
115 | ,mode | |
116 | (run-hooks ',hook-on)) | |
117 | (and ,hook-off | |
118 | (not ,mode) | |
119 | (run-hooks ',hook-off))))))) | |
120 | ||
121 | ;;;###autoload | |
122 | (defmacro easy-mmode-define-minor-mode | |
123 | (mode doc &optional init-value &optional lighter &optional keymap) | |
124 | "Define a new minor mode MODE. | |
125 | This function defines the associated control variable, keymap, | |
126 | toggle command, and hooks (see `easy-mmode-define-toggle'). | |
127 | ||
128 | DOC is the documentation for the mode toggle command. | |
129 | Optional LIGHTER is displayed in the mode-bar when the mode is on. | |
130 | Optional KEYMAP is the default (defvar) keymap bound to the mode keymap. | |
131 | If it is a list, it is passed to `easy-mmode-define-keymap' | |
132 | in order to build a valid keymap. | |
133 | ||
134 | \(defmacro easy-mmode-define-minor-mode | |
135 | (MODE DOC &optional INIT-VALUE &optional LIGHTER &optional KEYMAP)...\)" | |
136 | (let* ((mode-name (symbol-name mode)) | |
137 | (mode-doc (format "%s mode control switch." mode-name)) | |
138 | (keymap-name (concat mode-name "-map")) | |
139 | (keymap-doc (format "Keymap activated when %s mode is on." mode-name))) | |
140 | `(progn | |
141 | ;; define the switch | |
142 | (defvar ,mode ,init-value ,mode-doc) | |
143 | (make-variable-buffer-local ',mode) | |
144 | ||
145 | ;; define the minor-mode keymap | |
146 | (defvar ,(intern keymap-name) | |
147 | (cond ((and ,keymap (keymapp ,keymap)) | |
148 | ,keymap) | |
149 | ((listp ,keymap) | |
150 | (easy-mmode-define-keymap ,keymap)) | |
151 | (t (error "Invalid keymap %S" ,keymap))) | |
152 | ,keymap-doc) | |
153 | ||
154 | ;; define the toggle and the hooks | |
155 | ,(macroexpand `(easy-mmode-define-toggle ,mode ,doc)) ; toggle and hooks | |
156 | ||
157 | ;; update the mode-bar | |
158 | (or (assq ',mode minor-mode-alist) | |
159 | (setq minor-mode-alist | |
160 | (cons (list ',mode ,lighter) minor-mode-alist))) | |
161 | ||
162 | ;; update the minor-mode-map | |
163 | (or (assq ',mode minor-mode-map-alist) | |
164 | (setq minor-mode-map-alist | |
165 | (cons (cons ',mode ,(intern keymap-name)) minor-mode-map-alist)))) )) | |
166 | ||
167 | (provide 'easy-mmode) | |
168 | ||
169 | ;;; easy-mmode.el ends here |