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1 | ;;; map-ynp.el --- general-purpose boolean question-asker |
2 | ||
3 | ;; Copyright (C) 1991, 1992, 1993, 1994, 1995, 2000 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Roland McGrath <roland@gnu.org> | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: lisp, extensions | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
25 | ||
26 | ;;; Commentary: | |
27 | ||
28 | ;; map-y-or-n-p is a general-purpose question-asking function. | |
29 | ;; It asks a series of y/n questions (a la y-or-n-p), and decides to | |
30 | ;; apply an action to each element of a list based on the answer. | |
31 | ;; The nice thing is that you also get some other possible answers | |
32 | ;; to use, reminiscent of query-replace: ! to answer y to all remaining | |
33 | ;; questions; ESC or q to answer n to all remaining questions; . to answer | |
34 | ;; y once and then n for the remainder; and you can get help with C-h. | |
35 | ||
36 | ;;; Code: | |
37 | ||
38 | (defun map-y-or-n-p (prompter actor list &optional help action-alist | |
39 | no-cursor-in-echo-area) | |
40 | "Ask a series of boolean questions. | |
41 | Takes args PROMPTER ACTOR LIST, and optional args HELP and ACTION-ALIST. | |
42 | ||
43 | LIST is a list of objects, or a function of no arguments to return the next | |
44 | object or nil. | |
45 | ||
46 | If PROMPTER is a string, the prompt is \(format PROMPTER OBJECT\). If not | |
47 | a string, PROMPTER is a function of one arg (an object from LIST), which | |
48 | returns a string to be used as the prompt for that object. If the return | |
49 | value is not a string, it may be nil to ignore the object or non-nil to act | |
50 | on the object without asking the user. | |
51 | ||
52 | ACTOR is a function of one arg (an object from LIST), | |
53 | which gets called with each object that the user answers `yes' for. | |
54 | ||
55 | If HELP is given, it is a list (OBJECT OBJECTS ACTION), | |
56 | where OBJECT is a string giving the singular noun for an elt of LIST; | |
57 | OBJECTS is the plural noun for elts of LIST, and ACTION is a transitive | |
58 | verb describing ACTOR. The default is \(\"object\" \"objects\" \"act on\"\). | |
59 | ||
60 | At the prompts, the user may enter y, Y, or SPC to act on that object; | |
61 | n, N, or DEL to skip that object; ! to act on all following objects; | |
62 | ESC or q to exit (skip all following objects); . (period) to act on the | |
63 | current object and then exit; or \\[help-command] to get help. | |
64 | ||
65 | If ACTION-ALIST is given, it is an alist (KEY FUNCTION HELP) of extra keys | |
66 | that will be accepted. KEY is a character; FUNCTION is a function of one | |
67 | arg (an object from LIST); HELP is a string. When the user hits KEY, | |
68 | FUNCTION is called. If it returns non-nil, the object is considered | |
69 | \"acted upon\", and the next object from LIST is processed. If it returns | |
70 | nil, the prompt is repeated for the same object. | |
71 | ||
72 | Final optional argument NO-CURSOR-IN-ECHO-AREA non-nil says not to set | |
73 | `cursor-in-echo-area' while prompting. | |
74 | ||
75 | This function uses `query-replace-map' to define the standard responses, | |
76 | but not all of the responses which `query-replace' understands | |
77 | are meaningful here. | |
78 | ||
79 | Returns the number of actions taken." | |
80 | (let* ((actions 0) | |
81 | user-keys mouse-event map prompt char elt tail def | |
82 | ;; Non-nil means we should use mouse menus to ask. | |
83 | use-menus | |
84 | delayed-switch-frame | |
85 | (next (if (or (and list (symbolp list)) | |
86 | (subrp list) | |
87 | (byte-code-function-p list) | |
88 | (and (consp list) | |
89 | (eq (car list) 'lambda))) | |
90 | (function (lambda () | |
91 | (setq elt (funcall list)))) | |
92 | (function (lambda () | |
93 | (if list | |
94 | (progn | |
95 | (setq elt (car list) | |
96 | list (cdr list)) | |
97 | t) | |
98 | nil)))))) | |
99 | (if (and (listp last-nonmenu-event) | |
100 | use-dialog-box) | |
101 | ;; Make a list describing a dialog box. | |
102 | (let ((object (if help (capitalize (nth 0 help)))) | |
103 | (objects (if help (capitalize (nth 1 help)))) | |
104 | (action (if help (capitalize (nth 2 help))))) | |
105 | (setq map `(("Yes" . act) ("No" . skip) ("Quit" . exit) | |
106 | (,(if help (concat action " " object " And Quit") | |
107 | "Do it and Quit") . act-and-exit) | |
108 | (,(if help (concat action " All " objects) | |
109 | "Do All") . automatic) | |
110 | ,@(mapcar (lambda (elt) | |
111 | (cons (capitalize (nth 2 elt)) | |
112 | (vector (nth 1 elt)))) | |
113 | action-alist)) | |
114 | use-menus t | |
115 | mouse-event last-nonmenu-event)) | |
116 | (setq user-keys (if action-alist | |
117 | (concat (mapconcat (function | |
118 | (lambda (elt) | |
119 | (key-description | |
120 | (char-to-string (car elt))))) | |
121 | action-alist ", ") | |
122 | " ") | |
123 | "") | |
124 | ;; Make a map that defines each user key as a vector containing | |
125 | ;; its definition. | |
126 | map (cons 'keymap | |
127 | (append (mapcar (lambda (elt) | |
128 | (cons (car elt) (vector (nth 1 elt)))) | |
129 | action-alist) | |
130 | query-replace-map)))) | |
131 | (unwind-protect | |
132 | (progn | |
133 | (if (stringp prompter) | |
134 | (setq prompter `(lambda (object) | |
135 | (format ,prompter object)))) | |
136 | (while (funcall next) | |
137 | (setq prompt (funcall prompter elt)) | |
138 | (cond ((stringp prompt) | |
139 | ;; Prompt the user about this object. | |
140 | (setq quit-flag nil) | |
141 | (if use-menus | |
142 | (setq def (or (x-popup-dialog (or mouse-event use-menus) | |
143 | (cons prompt map)) | |
144 | 'quit)) | |
145 | ;; Prompt in the echo area. | |
146 | (let ((cursor-in-echo-area (not no-cursor-in-echo-area)) | |
147 | (message-log-max nil)) | |
148 | (message "%s(y, n, !, ., q, %sor %s) " | |
149 | prompt user-keys | |
150 | (key-description (vector help-char))) | |
151 | (if minibuffer-auto-raise | |
152 | (raise-frame (window-frame (minibuffer-window)))) | |
153 | (while (progn | |
154 | (setq char (read-event)) | |
155 | ;; If we get -1, from end of keyboard | |
156 | ;; macro, try again. | |
157 | (equal char -1))) | |
158 | ;; Show the answer to the question. | |
159 | (message "%s(y, n, !, ., q, %sor %s) %s" | |
160 | prompt user-keys | |
161 | (key-description (vector help-char)) | |
162 | (single-key-description char))) | |
163 | (setq def (lookup-key map (vector char)))) | |
164 | (cond ((eq def 'exit) | |
165 | (setq next (function (lambda () nil)))) | |
166 | ((eq def 'act) | |
167 | ;; Act on the object. | |
168 | (funcall actor elt) | |
169 | (setq actions (1+ actions))) | |
170 | ((eq def 'skip) | |
171 | ;; Skip the object. | |
172 | ) | |
173 | ((eq def 'act-and-exit) | |
174 | ;; Act on the object and then exit. | |
175 | (funcall actor elt) | |
176 | (setq actions (1+ actions) | |
177 | next (function (lambda () nil)))) | |
178 | ((eq def 'quit) | |
179 | (setq quit-flag t) | |
180 | (setq next `(lambda () | |
181 | (setq next ',next) | |
182 | ',elt))) | |
183 | ((eq def 'automatic) | |
184 | ;; Act on this and all following objects. | |
185 | (if (funcall prompter elt) | |
186 | (progn | |
187 | (funcall actor elt) | |
188 | (setq actions (1+ actions)))) | |
189 | (while (funcall next) | |
190 | (if (funcall prompter elt) | |
191 | (progn | |
192 | (funcall actor elt) | |
193 | (setq actions (1+ actions)))))) | |
194 | ((eq def 'help) | |
195 | (with-output-to-temp-buffer "*Help*" | |
196 | (princ | |
197 | (let ((object (if help (nth 0 help) "object")) | |
198 | (objects (if help (nth 1 help) "objects")) | |
199 | (action (if help (nth 2 help) "act on"))) | |
200 | (concat | |
201 | (format "Type SPC or `y' to %s the current %s; | |
202 | DEL or `n' to skip the current %s; | |
203 | RET or `q' to exit (skip all remaining %s); | |
204 | C-g to quit (cancel the operation); | |
205 | ! to %s all remaining %s;\n" | |
206 | action object object objects action | |
207 | objects) | |
208 | (mapconcat (function | |
209 | (lambda (elt) | |
210 | (format "%s to %s" | |
211 | (single-key-description | |
212 | (nth 0 elt)) | |
213 | (nth 2 elt)))) | |
214 | action-alist | |
215 | ";\n") | |
216 | (if action-alist ";\n") | |
217 | (format "or . (period) to %s \ | |
218 | the current %s and exit." | |
219 | action object)))) | |
220 | (save-excursion | |
221 | (set-buffer standard-output) | |
222 | (help-mode))) | |
223 | ||
224 | (setq next `(lambda () | |
225 | (setq next ',next) | |
226 | ',elt))) | |
227 | ((vectorp def) | |
228 | ;; A user-defined key. | |
229 | (if (funcall (aref def 0) elt) ;Call its function. | |
230 | ;; The function has eaten this object. | |
231 | (setq actions (1+ actions)) | |
232 | ;; Regurgitated; try again. | |
233 | (setq next `(lambda () | |
234 | (setq next ',next) | |
235 | ',elt)))) | |
236 | ((and (consp char) | |
237 | (eq (car char) 'switch-frame)) | |
238 | ;; switch-frame event. Put it off until we're done. | |
239 | (setq delayed-switch-frame char) | |
240 | (setq next `(lambda () | |
241 | (setq next ',next) | |
242 | ',elt))) | |
243 | (t | |
244 | ;; Random char. | |
245 | (message "Type %s for help." | |
246 | (key-description (vector help-char))) | |
247 | (beep) | |
248 | (sit-for 1) | |
249 | (setq next `(lambda () | |
250 | (setq next ',next) | |
251 | ',elt))))) | |
252 | (prompt | |
253 | (funcall actor elt) | |
254 | (setq actions (1+ actions)))))) | |
255 | (if delayed-switch-frame | |
256 | (setq unread-command-events | |
257 | (cons delayed-switch-frame unread-command-events)))) | |
258 | ;; Clear the last prompt from the minibuffer. | |
259 | (let ((message-log-max nil)) | |
260 | (message "")) | |
261 | ;; Return the number of actions that were taken. | |
262 | actions)) | |
263 | ||
264 | ;;; map-ynp.el ends here |