(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
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 (and (listp last-nonmenu-event)
use-dialog-box)
(let ((object (if help (capitalize (nth 0 help))))
(objects (if help (capitalize (nth 1 help))))
(action (if help (capitalize (nth 2 help)))))
(setq map `(("Yes" . act) ("No" . skip)
,@(mapcar (lambda (elt)
(cons (with-syntax-table
text-mode-syntax-table
(capitalize (nth 2 elt)))
(vector (nth 1 elt))))
action-alist)
(,(if help (concat action " This But No More")
"Do This But No More") . act-and-exit)
(,(if help (concat action " All " objects)
"Do All") . automatic)
("No For All" . exit))
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 ", ")
" ")
"")
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)
(setq quit-flag nil)
(if use-menus
(setq def (or (x-popup-dialog (or mouse-event use-menus)
(cons prompt map))
'quit))
(let ((cursor-in-echo-area (not no-cursor-in-echo-area))
(message-log-max nil))
(message (apply 'propertize "%s(y, n, !, ., q, %sor %s) "
minibuffer-prompt-properties)
prompt user-keys
(key-description (vector help-char)))
(if minibuffer-auto-raise
(raise-frame (window-frame (minibuffer-window))))
(while (progn
(setq char (read-event))
(equal char -1)))
(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)
(funcall actor elt)
(setq actions (1+ actions)))
((eq def 'skip)
)
((eq def 'act-and-exit)
(funcall actor elt)
(setq actions (1+ actions)
next (function (lambda () nil))))
((eq def 'quit)
(setq quit-flag t)
(setq next `(lambda ()
(setq next ',next)
',elt)))
((eq def 'automatic)
(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;
RET or `q' to give up on the %s (skip all remaining %s);
C-g to quit (cancel the whole command);
! to %s all remaining %s;\n"
action object object action objects action
objects)
(mapconcat (function
(lambda (elt)
(format "%s to %s"
(single-key-description
(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)
(if (funcall (aref def 0) elt) (setq actions (1+ actions))
(setq next `(lambda ()
(setq next ',next)
',elt))))
((and (consp char)
(eq (car char) 'switch-frame))
(setq delayed-switch-frame char)
(setq next `(lambda ()
(setq next ',next)
',elt)))
(t
(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))))
(let ((message-log-max nil))
(message ""))
actions))