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