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Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
260 lines
9.3 KiB
EmacsLisp
260 lines
9.3 KiB
EmacsLisp
;;; map-ynp.el --- general-purpose boolean question-asker -*- lexical-binding:t -*-
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;; Copyright (C) 1991-1995, 2000-2017 Free Software Foundation, Inc.
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;; Author: Roland McGrath <roland@gnu.org>
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: lisp, extensions
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;; Package: emacs
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; map-y-or-n-p is a general-purpose question-asking function.
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;; It asks a series of y/n questions (a la y-or-n-p), and decides to
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;; apply an action to each element of a list based on the answer.
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;; The nice thing is that you also get some other possible answers
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;; to use, reminiscent of query-replace: ! to answer y to all remaining
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;; questions; ESC or q to answer n to all remaining questions; . to answer
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;; y once and then n for the remainder; and you can get help with C-h.
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;;; Code:
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(declare-function x-popup-dialog "menu.c" (position contents &optional header))
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(defun map-y-or-n-p (prompter actor list &optional help action-alist
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no-cursor-in-echo-area)
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"Ask a series of boolean questions.
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Takes args PROMPTER ACTOR LIST, and optional args HELP and ACTION-ALIST.
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LIST is a list of objects, or a function of no arguments to return the next
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object or nil.
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If PROMPTER is a string, the prompt is \(format PROMPTER OBJECT). If not
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a string, PROMPTER is a function of one arg (an object from LIST), which
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returns a string to be used as the prompt for that object. If the return
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value is not a string, it may be nil to ignore the object or non-nil to act
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on the object without asking the user.
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ACTOR is a function of one arg (an object from LIST),
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which gets called with each object that the user answers `yes' for.
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If HELP is given, it is a list (OBJECT OBJECTS ACTION),
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where OBJECT is a string giving the singular noun for an elt of LIST;
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OBJECTS is the plural noun for elts of LIST, and ACTION is a transitive
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verb describing ACTOR. The default is \(\"object\" \"objects\" \"act on\").
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At the prompts, the user may enter y, Y, or SPC to act on that object;
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n, N, or DEL to skip that object; ! to act on all following objects;
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ESC or q to exit (skip all following objects); . (period) to act on the
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current object and then exit; or \\[help-command] to get help.
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If ACTION-ALIST is given, it is an alist (KEY FUNCTION HELP) of extra keys
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that will be accepted. KEY is a character; FUNCTION is a function of one
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arg (an object from LIST); HELP is a string. When the user hits KEY,
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FUNCTION is called. If it returns non-nil, the object is considered
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\"acted upon\", and the next object from LIST is processed. If it returns
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nil, the prompt is repeated for the same object.
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Final optional argument NO-CURSOR-IN-ECHO-AREA non-nil says not to set
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`cursor-in-echo-area' while prompting.
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This function uses `query-replace-map' to define the standard responses,
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but not all of the responses which `query-replace' understands
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are meaningful here.
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Returns the number of actions taken."
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(let* ((actions 0)
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user-keys mouse-event map prompt char elt def
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;; Non-nil means we should use mouse menus to ask.
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use-menus
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delayed-switch-frame
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;; Rebind other-window-scroll-buffer so that subfunctions can set
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;; it temporarily, without risking affecting the caller.
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(other-window-scroll-buffer other-window-scroll-buffer)
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(next (if (functionp list)
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(lambda () (setq elt (funcall list)))
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(lambda () (when list
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(setq elt (pop list))
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t))))
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(try-again (lambda ()
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(let ((x next))
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(setq next (lambda () (setq next x) elt))))))
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(if (and (listp last-nonmenu-event)
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use-dialog-box)
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;; Make a list describing a dialog box.
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(let ((objects (if help (capitalize (nth 1 help))))
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(action (if help (capitalize (nth 2 help)))))
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(setq map `(("Yes" . act) ("No" . skip)
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,@(mapcar (lambda (elt)
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(cons (with-syntax-table
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text-mode-syntax-table
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(capitalize (nth 2 elt)))
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(vector (nth 1 elt))))
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action-alist)
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(,(if help (concat action " This But No More")
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"Do This But No More") . act-and-exit)
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(,(if help (concat action " All " objects)
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"Do All") . automatic)
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("No For All" . exit))
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use-menus t
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mouse-event last-nonmenu-event))
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(setq user-keys (if action-alist
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(concat (mapconcat (lambda (elt)
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(key-description
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(vector (car elt))))
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action-alist ", ")
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" ")
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"")
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;; Make a map that defines each user key as a vector containing
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;; its definition.
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map
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(let ((map (make-sparse-keymap)))
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(set-keymap-parent map query-replace-map)
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(dolist (elt action-alist)
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(define-key map (vector (car elt)) (vector (nth 1 elt))))
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map)))
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(unwind-protect
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(progn
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(if (stringp prompter)
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(setq prompter (let ((prompter prompter))
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(lambda (object)
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(format prompter object)))))
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(while (funcall next)
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(setq prompt (funcall prompter elt))
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(cond ((stringp prompt)
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;; Prompt the user about this object.
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(setq quit-flag nil)
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(if use-menus
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(setq def (or (x-popup-dialog (or mouse-event use-menus)
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(cons prompt map))
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'quit))
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;; Prompt in the echo area.
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(let ((cursor-in-echo-area (not no-cursor-in-echo-area)))
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(message (apply 'propertize "%s(y, n, !, ., q, %sor %s) "
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minibuffer-prompt-properties)
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prompt user-keys
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(key-description (vector help-char)))
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(if minibuffer-auto-raise
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(raise-frame (window-frame (minibuffer-window))))
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(while (progn
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(setq char (read-event))
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;; If we get -1, from end of keyboard
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;; macro, try again.
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(equal char -1)))
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;; Show the answer to the question.
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(message "%s(y, n, !, ., q, %sor %s) %s"
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prompt user-keys
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(key-description (vector help-char))
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(single-key-description char)))
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(setq def (lookup-key map (vector char))))
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(cond ((eq def 'exit)
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(setq next (lambda () nil)))
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((eq def 'act)
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;; Act on the object.
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(funcall actor elt)
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(setq actions (1+ actions)))
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((eq def 'skip)
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;; Skip the object.
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)
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((eq def 'act-and-exit)
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;; Act on the object and then exit.
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(funcall actor elt)
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(setq actions (1+ actions)
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next (lambda () nil)))
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((eq def 'quit)
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(setq quit-flag t)
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(funcall try-again))
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((eq def 'automatic)
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;; Act on this and all following objects.
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(if (funcall prompter elt)
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(progn
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(funcall actor elt)
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(setq actions (1+ actions))))
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(while (funcall next)
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(if (funcall prompter elt)
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(progn
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(funcall actor elt)
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(setq actions (1+ actions))))))
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((eq def 'help)
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(with-output-to-temp-buffer "*Help*"
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(princ
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(let ((object (if help (nth 0 help) "object"))
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(objects (if help (nth 1 help) "objects"))
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(action (if help (nth 2 help) "act on")))
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(concat
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(format-message "\
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Type SPC or `y' to %s the current %s;
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DEL or `n' to skip the current %s;
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RET or `q' to give up on the %s (skip all remaining %s);
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C-g to quit (cancel the whole command);
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! to %s all remaining %s;\n"
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action object object action objects action
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objects)
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(mapconcat (function
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(lambda (elt)
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(format "%s to %s"
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(single-key-description
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(nth 0 elt))
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(nth 2 elt))))
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action-alist
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";\n")
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(if action-alist ";\n")
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(format "or . (period) to %s \
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the current %s and exit."
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action object))))
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(with-current-buffer standard-output
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(help-mode)))
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(funcall try-again))
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((and (symbolp def) (commandp def))
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(call-interactively def)
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;; Regurgitated; try again.
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(funcall try-again))
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((vectorp def)
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;; A user-defined key.
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(if (funcall (aref def 0) elt) ;Call its function.
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;; The function has eaten this object.
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(setq actions (1+ actions))
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;; Regurgitated; try again.
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(funcall try-again)))
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((and (consp char)
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(eq (car char) 'switch-frame))
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;; switch-frame event. Put it off until we're done.
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(setq delayed-switch-frame char)
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(funcall try-again))
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(t
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;; Random char.
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(message "Type %s for help."
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(key-description (vector help-char)))
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(beep)
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(sit-for 1)
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(funcall try-again))))
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(prompt
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(funcall actor elt)
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(setq actions (1+ actions))))))
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(if delayed-switch-frame
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(setq unread-command-events
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(cons delayed-switch-frame unread-command-events))))
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;; Clear the last prompt from the minibuffer.
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(let ((message-log-max nil))
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(message ""))
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;; Return the number of actions that were taken.
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actions))
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;;; map-ynp.el ends here
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