mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-27 07:37:33 +00:00
254 lines
8.7 KiB
EmacsLisp
254 lines
8.7 KiB
EmacsLisp
;;; 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)))
|
|
(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
|