From: Juri Linkov Date: Sun, 21 Jan 2018 21:45:43 +0000 (+0200) Subject: New function read-answer (Bug#31782) X-Git-Tag: emacs-26.1.90~221 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=cc233365a925dcf9fa7270630819f2e6e75280da;p=emacs.git New function read-answer (Bug#31782) * lisp/emacs-lisp/map-ynp.el (read-answer-short): New defcustom. (read-answer): New function. * lisp/subr.el (assoc-delete-all): New function. * etc/NEWS: Announce them. * lisp/dired.el (dired-delete-file): Use read-answer. (dired--yes-no-all-quit-help): Remove function. (dired-delete-help): Remove defconst. (backported from master, "New function read-answer (bug#30073)" and "Respect non-saved value of `read-short-answer' (Bug#31782)") --- diff --git a/etc/NEWS b/etc/NEWS index a27d1b89ec8..a1c12a6766c 100644 --- a/etc/NEWS +++ b/etc/NEWS @@ -110,6 +110,12 @@ be removed prior using the changed 'shadow-*' commands. * Lisp Changes in Emacs 26.2 +** The new function 'read-answer' accepts either long or short answers +depending on the new customizable variable 'read-answer-short'. + +** New function 'assoc-delete-all'. +Like 'assq-delete-all', but uses 'equal' for comparison. + * Changes in Emacs 26.2 on Non-Free Operating Systems diff --git a/lisp/dired.el b/lisp/dired.el index c421e51ffd1..2520ed2a109 100644 --- a/lisp/dired.el +++ b/lisp/dired.el @@ -2995,37 +2995,6 @@ Any other value means to ask for each directory." ;; Match anything but `.' and `..'. (defvar dired-re-no-dot "^\\([^.]\\|\\.\\([^.]\\|\\..\\)\\).*") -(defconst dired-delete-help - "Type: -`yes' to delete recursively the current directory, -`no' to skip to next, -`all' to delete all remaining directories with no more questions, -`quit' to exit, -`help' to show this help message.") - -(defun dired--yes-no-all-quit-help (prompt &optional help-msg) - "Ask a question with valid answers: yes, no, all, quit, help. -PROMPT must end with '? ', for instance, 'Delete it? '. -If optional arg HELP-MSG is non-nil, then is a message to show when -the user answers 'help'. Otherwise, default to `dired-delete-help'." - (let ((valid-answers (list "yes" "no" "all" "quit")) - (answer "") - (input-fn (lambda () - (read-string - (format "%s [yes, no, all, quit, help] " prompt))))) - (setq answer (funcall input-fn)) - (when (string= answer "help") - (with-help-window "*Help*" - (with-current-buffer "*Help*" - (insert (or help-msg dired-delete-help))))) - (while (not (member answer valid-answers)) - (unless (string= answer "help") - (beep) - (message "Please answer `yes' or `no' or `all' or `quit'") - (sleep-for 2)) - (setq answer (funcall input-fn))) - answer)) - ;; Delete file, possibly delete a directory and all its files. ;; This function is useful outside of dired. One could change its name ;; to e.g. recursive-delete-file and put it somewhere else. @@ -3055,11 +3024,17 @@ TRASH non-nil means to trash the file instead of deleting, provided "trash" "delete") (dired-make-relative file)))) - (pcase (dired--yes-no-all-quit-help prompt) ; Prompt user. + (pcase (read-answer + prompt + '(("yes" ?y "delete recursively the current directory") + ("no" ?n "skip to next") + ("all" ?! "delete all remaining directories with no more questions") + ("quit" ?q "exit"))) ('"all" (setq recursive 'always dired-recursive-deletes recursive)) ('"yes" (if (eq recursive 'top) (setq recursive 'always))) ('"no" (setq recursive nil)) - ('"quit" (keyboard-quit))))) + ('"quit" (keyboard-quit)) + (_ (keyboard-quit))))) ; catch all unknown answers (setq recursive nil)) ; Empty dir or recursive is nil. (delete-directory file recursive trash)))) diff --git a/lisp/emacs-lisp/map-ynp.el b/lisp/emacs-lisp/map-ynp.el index 2a7eddedad7..8260af57278 100644 --- a/lisp/emacs-lisp/map-ynp.el +++ b/lisp/emacs-lisp/map-ynp.el @@ -256,4 +256,132 @@ the current %s and exit." ;; Return the number of actions that were taken. actions)) + +;; read-answer is a general-purpose question-asker that supports +;; either long or short answers. + +;; For backward compatibility check if short y/n answers are preferred. +(defcustom read-answer-short 'auto + "If non-nil, `read-answer' accepts single-character answers. +If t, accept short (single key-press) answers to the question. +If nil, require long answers. If `auto', accept short answers if +the function cell of `yes-or-no-p' is set to `y-or-on-p'." + :type '(choice (const :tag "Accept short answers" t) + (const :tag "Require long answer" nil) + (const :tag "Guess preference" auto)) + :version "26.2" + :group 'minibuffer) + +(defconst read-answer-map--memoize (make-hash-table :weakness 'key :test 'equal)) + +(defun read-answer (question answers) + "Read an answer either as a complete word or its character abbreviation. +Ask user a question and accept an answer from the list of possible answers. + +QUESTION should end in a space; this function adds a list of answers to it. + +ANSWERS is an alist with elements in the following format: + (LONG-ANSWER SHORT-ANSWER HELP-MESSAGE) +where + LONG-ANSWER is a complete answer, + SHORT-ANSWER is an abbreviated one-character answer, + HELP-MESSAGE is a string describing the meaning of the answer. + +Example: + \\='((\"yes\" ?y \"perform the action\") + (\"no\" ?n \"skip to the next\") + (\"all\" ?! \"accept all remaining without more questions\") + (\"help\" ?h \"show help\") + (\"quit\" ?q \"exit\")) + +When `read-answer-short' is non-nil, accept short answers. + +Return a long answer even in case of accepting short ones. + +When `use-dialog-box' is t, pop up a dialog window to get user input." + (let* ((short (if (eq read-answer-short 'auto) + (eq (symbol-function 'yes-or-no-p) 'y-or-n-p) + read-answer-short)) + (answers-with-help + (if (assoc "help" answers) + answers + (append answers '(("help" ?? "show this help message"))))) + (answers-without-help + (assoc-delete-all "help" (copy-alist answers-with-help))) + (prompt + (format "%s(%s) " question + (mapconcat (lambda (a) + (if short + (format "%c" (nth 1 a)) + (nth 0 a))) + answers-with-help ", "))) + (message + (format "Please answer %s." + (mapconcat (lambda (a) + (format "`%s'" (if short + (string (nth 1 a)) + (nth 0 a)))) + answers-with-help " or "))) + (short-answer-map + (when short + (or (gethash answers read-answer-map--memoize) + (puthash answers + (let ((map (make-sparse-keymap))) + (set-keymap-parent map minibuffer-local-map) + (dolist (a answers-with-help) + (define-key map (vector (nth 1 a)) + (lambda () + (interactive) + (delete-minibuffer-contents) + (insert (nth 0 a)) + (exit-minibuffer)))) + (define-key map [remap self-insert-command] + (lambda () + (interactive) + (delete-minibuffer-contents) + (beep) + (message message) + (sleep-for 2))) + map) + read-answer-map--memoize)))) + answer) + (while (not (assoc (setq answer (downcase + (cond + ((and (display-popup-menus-p) + last-input-event ; not during startup + (listp last-nonmenu-event) + use-dialog-box) + (x-popup-dialog + t + (cons question + (mapcar (lambda (a) + (cons (capitalize (nth 0 a)) + (nth 0 a))) + answers-with-help)))) + (short + (read-from-minibuffer + prompt nil short-answer-map nil + 'yes-or-no-p-history)) + (t + (read-from-minibuffer + prompt nil nil nil + 'yes-or-no-p-history))))) + answers-without-help)) + (if (string= answer "help") + (with-help-window "*Help*" + (with-current-buffer "*Help*" + (insert "Type:\n" + (mapconcat + (lambda (a) + (format "`%s'%s to %s" + (if short (string (nth 1 a)) (nth 0 a)) + (if short (format " (%s)" (nth 0 a)) "") + (nth 2 a))) + answers-with-help ",\n") + ".\n"))) + (beep) + (message message) + (sleep-for 2))) + answer)) + ;;; map-ynp.el ends here diff --git a/lisp/subr.el b/lisp/subr.el index f8ac70edefa..7582b6cdb85 100644 --- a/lisp/subr.el +++ b/lisp/subr.el @@ -705,6 +705,21 @@ Non-strings in LIST are ignored." (setq list (cdr list))) list) +(defun assoc-delete-all (key alist) + "Delete from ALIST all elements whose car is `equal' to KEY. +Return the modified alist. +Elements of ALIST that are not conses are ignored." + (while (and (consp (car alist)) + (equal (car (car alist)) key)) + (setq alist (cdr alist))) + (let ((tail alist) tail-cdr) + (while (setq tail-cdr (cdr tail)) + (if (and (consp (car tail-cdr)) + (equal (car (car tail-cdr)) key)) + (setcdr tail (cdr tail-cdr)) + (setq tail tail-cdr)))) + alist) + (defun assq-delete-all (key alist) "Delete from ALIST all elements whose car is `eq' to KEY. Return the modified alist. diff --git a/test/lisp/dired-tests.el b/test/lisp/dired-tests.el index c0242137b3a..bb0e1bc3880 100644 --- a/test/lisp/dired-tests.el +++ b/test/lisp/dired-tests.el @@ -384,9 +384,9 @@ (dired-test-with-temp-dirs 'just-empty-dirs (let (asked) - (advice-add 'dired--yes-no-all-quit-help + (advice-add 'read-answer :override - (lambda (_) (setq asked t) "") + (lambda (_q _a) (setq asked t) "") '((name . dired-test-bug27940-advice))) (dired default-directory) (dired-toggle-marks) @@ -395,44 +395,44 @@ (progn (should-not asked) (should-not (dired-get-marked-files))) ; All dirs deleted. - (advice-remove 'dired--yes-no-all-quit-help 'dired-test-bug27940-advice)))) + (advice-remove 'read-answer 'dired-test-bug27940-advice)))) ;; Answer yes (dired-test-with-temp-dirs nil - (advice-add 'dired--yes-no-all-quit-help :override (lambda (_) "yes") + (advice-add 'read-answer :override (lambda (_q _a) "yes") '((name . dired-test-bug27940-advice))) (dired default-directory) (dired-toggle-marks) (dired-do-delete nil) (unwind-protect (should-not (dired-get-marked-files)) ; All dirs deleted. - (advice-remove 'dired--yes-no-all-quit-help 'dired-test-bug27940-advice))) + (advice-remove 'read-answer 'dired-test-bug27940-advice))) ;; Answer no (dired-test-with-temp-dirs nil - (advice-add 'dired--yes-no-all-quit-help :override (lambda (_) "no") + (advice-add 'read-answer :override (lambda (_q _a) "no") '((name . dired-test-bug27940-advice))) (dired default-directory) (dired-toggle-marks) (dired-do-delete nil) (unwind-protect (should (= 5 (length (dired-get-marked-files)))) ; Just the empty dirs deleted. - (advice-remove 'dired--yes-no-all-quit-help 'dired-test-bug27940-advice))) + (advice-remove 'read-answer 'dired-test-bug27940-advice))) ;; Answer all (dired-test-with-temp-dirs nil - (advice-add 'dired--yes-no-all-quit-help :override (lambda (_) "all") + (advice-add 'read-answer :override (lambda (_q _a) "all") '((name . dired-test-bug27940-advice))) (dired default-directory) (dired-toggle-marks) (dired-do-delete nil) (unwind-protect (should-not (dired-get-marked-files)) ; All dirs deleted. - (advice-remove 'dired--yes-no-all-quit-help 'dired-test-bug27940-advice))) + (advice-remove 'read-answer 'dired-test-bug27940-advice))) ;; Answer quit (dired-test-with-temp-dirs nil - (advice-add 'dired--yes-no-all-quit-help :override (lambda (_) "quit") + (advice-add 'read-answer :override (lambda (_q _a) "quit") '((name . dired-test-bug27940-advice))) (dired default-directory) (dired-toggle-marks) @@ -440,7 +440,7 @@ (dired-do-delete nil)) (unwind-protect (should (= 6 (length (dired-get-marked-files)))) ; All empty dirs but zeta-empty-dir deleted. - (advice-remove 'dired--yes-no-all-quit-help 'dired-test-bug27940-advice)))) + (advice-remove 'read-answer 'dired-test-bug27940-advice)))) (provide 'dired-tests)