mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-12 09:28:24 +00:00
615cf550f2
* lisp/emacs-lisp/rmc.el (read-multiple-choice): Doc fix. Improve the message when entering recursive-edit.
222 lines
9.3 KiB
EmacsLisp
222 lines
9.3 KiB
EmacsLisp
;;; rmc.el --- read from a multiple choice question -*- lexical-binding: t -*-
|
|
|
|
;; Copyright (C) 2016-2021 Free Software Foundation, Inc.
|
|
|
|
;; Maintainer: emacs-devel@gnu.org
|
|
|
|
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;;; Code:
|
|
|
|
(require 'seq)
|
|
|
|
;;;###autoload
|
|
(defun read-multiple-choice (prompt choices &optional help-string)
|
|
"Ask user to select an entry from CHOICES, promting with PROMPT.
|
|
This function allows to ask the user a multiple-choice question.
|
|
|
|
CHOICES should be a list of the form (KEY NAME [DESCRIPTION]).
|
|
KEY is a character the user should type to select the entry.
|
|
NAME is a short name for the entry to be displayed while prompting
|
|
\(if there's no room, it might be shortened).
|
|
DESCRIPTION is an optional longer description of the entry; it will
|
|
be displayed in a help buffer if the user requests more help. This
|
|
help description has a fixed format in columns. For greater
|
|
flexibility, instead of passing a DESCRIPTION, the caller can pass
|
|
the optional argument HELP-STRING. This argument is a string that
|
|
should contain a more detailed description of all of the possible
|
|
choices. `read-multiple-choice' will display that description in a
|
|
help buffer if the user requests that.
|
|
|
|
This function translates user input into responses by consulting
|
|
the bindings in `query-replace-map'; see the documentation of
|
|
that variable for more information. The relevant bindings for the
|
|
purposes of this function are `recenter', `scroll-up', `scroll-down',
|
|
and `edit'.
|
|
If the user types the `recenter', `scroll-up', or `scroll-down'
|
|
responses, the function performs the requested window recentering or
|
|
scrolling, and then asks the question again. If the user enters `edit',
|
|
the function starts a recursive edit. When the user exit the recursive
|
|
edit, the multiple-choice prompt gains focus again.
|
|
|
|
When `use-dialog-box' is t (the default), and the command using this
|
|
function was invoked via the mouse, this function pops up a GUI dialog
|
|
to collect the user input, but only if Emacs is capable of using GUI
|
|
dialogs. Otherwise, the function will always use text-mode dialogs.
|
|
|
|
The return value is the matching entry from the CHOICES list.
|
|
|
|
Usage example:
|
|
|
|
\(read-multiple-choice \"Continue connecting?\"
|
|
\\='((?a \"always\")
|
|
(?s \"session only\")
|
|
(?n \"no\")))"
|
|
(let* ((altered-names nil)
|
|
(full-prompt
|
|
(format
|
|
"%s (%s): "
|
|
prompt
|
|
(mapconcat
|
|
(lambda (elem)
|
|
(let* ((name (cadr elem))
|
|
(pos (seq-position name (car elem)))
|
|
(altered-name
|
|
(cond
|
|
;; Not in the name string.
|
|
((not pos)
|
|
(format "[%c] %s" (car elem) name))
|
|
;; The prompt character is in the name, so highlight
|
|
;; it on graphical terminals...
|
|
((display-supports-face-attributes-p
|
|
'(:underline t) (window-frame))
|
|
(setq name (copy-sequence name))
|
|
(put-text-property pos (1+ pos)
|
|
'face 'read-multiple-choice-face
|
|
name)
|
|
name)
|
|
;; And put it in [bracket] on non-graphical terminals.
|
|
(t
|
|
(concat
|
|
(substring name 0 pos)
|
|
"["
|
|
(upcase (substring name pos (1+ pos)))
|
|
"]"
|
|
(substring name (1+ pos)))))))
|
|
(push (cons (car elem) altered-name)
|
|
altered-names)
|
|
altered-name))
|
|
(append choices '((?? "?")))
|
|
", ")))
|
|
tchar buf wrong-char answer)
|
|
(save-window-excursion
|
|
(save-excursion
|
|
(while (not tchar)
|
|
(message "%s%s"
|
|
(if wrong-char
|
|
"Invalid choice. "
|
|
"")
|
|
full-prompt)
|
|
(setq tchar
|
|
(if (and (display-popup-menus-p)
|
|
last-input-event ; not during startup
|
|
(consp last-nonmenu-event)
|
|
use-dialog-box)
|
|
(x-popup-dialog
|
|
t
|
|
(cons prompt
|
|
(mapcar
|
|
(lambda (elem)
|
|
(cons (capitalize (cadr elem))
|
|
(car elem)))
|
|
choices)))
|
|
(condition-case nil
|
|
(let ((cursor-in-echo-area t))
|
|
(read-event))
|
|
(error nil))))
|
|
(setq answer (lookup-key query-replace-map (vector tchar) t))
|
|
(setq tchar
|
|
(cond
|
|
((eq answer 'recenter)
|
|
(recenter) t)
|
|
((eq answer 'scroll-up)
|
|
(ignore-errors (scroll-up-command)) t)
|
|
((eq answer 'scroll-down)
|
|
(ignore-errors (scroll-down-command)) t)
|
|
((eq answer 'scroll-other-window)
|
|
(ignore-errors (scroll-other-window)) t)
|
|
((eq answer 'scroll-other-window-down)
|
|
(ignore-errors (scroll-other-window-down)) t)
|
|
((eq answer 'edit)
|
|
(save-match-data
|
|
(save-excursion
|
|
(message "%s"
|
|
(substitute-command-keys
|
|
"Recursive edit; type \\[exit-recursive-edit] to return to help screen"))
|
|
(recursive-edit))))
|
|
(t tchar)))
|
|
(when (eq tchar t)
|
|
(setq wrong-char nil
|
|
tchar nil))
|
|
;; The user has entered an invalid choice, so display the
|
|
;; help messages.
|
|
(when (and (not (eq tchar nil))
|
|
(not (assq tchar choices)))
|
|
(setq wrong-char (not (memq tchar `(?? ,help-char)))
|
|
tchar nil)
|
|
(when wrong-char
|
|
(ding))
|
|
(setq buf (get-buffer-create "*Multiple Choice Help*"))
|
|
(if (stringp help-string)
|
|
(with-help-window buf
|
|
(with-current-buffer buf
|
|
(insert help-string)))
|
|
(with-help-window buf
|
|
(with-current-buffer buf
|
|
(erase-buffer)
|
|
(pop-to-buffer buf)
|
|
(insert prompt "\n\n")
|
|
(let* ((columns (/ (window-width) 25))
|
|
(fill-column 21)
|
|
(times 0)
|
|
(start (point)))
|
|
(dolist (elem choices)
|
|
(goto-char start)
|
|
(unless (zerop times)
|
|
(if (zerop (mod times columns))
|
|
;; Go to the next "line".
|
|
(goto-char (setq start (point-max)))
|
|
;; Add padding.
|
|
(while (not (eobp))
|
|
(end-of-line)
|
|
(insert (make-string (max (- (* (mod times columns)
|
|
(+ fill-column 4))
|
|
(current-column))
|
|
0)
|
|
?\s))
|
|
(forward-line 1))))
|
|
(setq times (1+ times))
|
|
(let ((text
|
|
(with-temp-buffer
|
|
(insert (format
|
|
"%c: %s\n"
|
|
(car elem)
|
|
(cdr (assq (car elem) altered-names))))
|
|
(fill-region (point-min) (point-max))
|
|
(when (nth 2 elem)
|
|
(let ((start (point)))
|
|
(insert (nth 2 elem))
|
|
(unless (bolp)
|
|
(insert "\n"))
|
|
(fill-region start (point-max))))
|
|
(buffer-string))))
|
|
(goto-char start)
|
|
(dolist (line (split-string text "\n"))
|
|
(end-of-line)
|
|
(if (bolp)
|
|
(insert line "\n")
|
|
(insert line))
|
|
(forward-line 1))))))))))))
|
|
(when (buffer-live-p buf)
|
|
(kill-buffer buf))
|
|
(assq tchar choices)))
|
|
|
|
(provide 'rmc)
|
|
|
|
;;; rmc.el ends here
|