Emacs如何将命令绑定到所有键,只有几个键免除?

时间:2011-12-18 17:32:43

标签: emacs elisp mode key-bindings

我想创建一个具有键映射(foo-mode-map)的次模式(foo-mode),但是当用户按下不在(foo-mode-map)中的任何键时,次模式应该放弃。如何绑定turn-off-foo-mode所有其他密钥?

编辑:这是我根据所选答案提出的解决方案。它也接受数字输入。

(defalias 'foo-electric-delete 'backward-kill-word)

(defun foo-mode-quit (&optional arg)
  (interactive)
  (let ((global-binding (lookup-key (current-global-map)
                                    (single-key-description last-input-event))))
    (unless (eq last-input-event ?\C-g)
      (push last-input-event unread-command-events))
    (unless (memq global-binding
                  '(negative-argument digit-argument))
      (foo-mode -1))))

(defvar foo-mode-map
  (let ((map (make-keymap)))
    (set-char-table-range (nth 1 map) t 'foo-mode-quit)
    (define-key map "-" 'negative-argument)
    (dolist (k (number-sequence ?0 ?9))
      (define-key map (char-to-string k) 'digit-argument))
    (define-key map [backspace] 'foo-electric-delete)
    map))

(define-minor-mode foo-mode
  "Toggle Foo mode.
     With no argument, this command toggles the mode.
     Non-null prefix argument turns on the mode.
     Null prefix argument turns off the mode.

     When Foo mode is enabled, the control delete key
     gobbles all preceding whitespace except the last.
     See the command \\[foo-electric-delete]."
  ;; The initial value.
  :init-value nil
  ;; The indicator for the mode line.
  :lighter " Foo"
  ;; The minor mode bindings.
  :keymap foo-mode-map
  :group 'foo)

4 个答案:

答案 0 :(得分:4)

你要决定的一件事是,当用户按下另一个键时,你应该简单地退出你的模式,如果你应该运行绑定到相关键的命令(比如在incremental-search中)。 / p>

一种方法是使用pre-command-hook检查this-command是否是您的命令之一,如果情况不是这样,请关闭您的模式。

答案 1 :(得分:4)

解决方案2:您可以使用set-char-table-range设置地图中的所有字符。例如:

(defvar foo-mode-map
  (let ((map (make-keymap)))
    (set-char-table-range (nth 1 map) t 'foo-turn-off-foo-mode)
    ...
    map))

答案 2 :(得分:4)

我已经包含了一个完整的工作示例,用于创建具有您想要的行为的次要模式;关键是在set-char-table-range创建的密钥图上使用make-keymap,这会创建一个带有完整char-table的密集密钥图;在使用make-sparse-keymap创建的稀疏键映射上使用此功能将无效。

(defalias 'foo-electric-delete 'backward-kill-word)

(defun foo-mode-quit (&optional arg)
  (interactive)
  (foo-mode -1))

(defvar foo-mode-map
  (let (map (make-keymap))
    (set-char-table-range (nth 1 map) t 'foo-mode-quit)
    (define-key map [backspace] 'foo-electric-delete)
    map))

(define-minor-mode foo-mode
  "Toggle Foo mode.
     With no argument, this command toggles the mode.
     Non-null prefix argument turns on the mode.
     Null prefix argument turns off the mode.

     When Foo mode is enabled, the control delete key
     gobbles all preceding whitespace except the last.
     See the command \\[foo-electric-delete]."
  ;; The initial value.
  :init-value nil
  ;; The indicator for the mode line.
  :lighter " Foo"
  ;; The minor mode bindings.
  :keymap foo-mode-map
  :group 'foo)

(defvar major-baz-mode-map '(keymap (t . major-baz-mode-default-function)))

为主模式地图设置默认绑定更容易,我在此处包含此示例,但正如我上面所述,这种备用键映射不适用于次要模式:

(defvar major-baz-mode-map '(keymap (t . major-baz-mode-default-function)))

这在Format of Keymaps中的文档中进行了讨论,其中包含:

(t . binding)

This specifies a default key binding; any event not bound by other
elements of the keymap is given binding as its binding. Default
bindings allow a keymap to bind all possible event types without
having to enumerate all of them. A keymap that has a default binding
completely masks any lower-precedence keymap, except for events
explicitly bound to nil (see below).

答案 3 :(得分:1)

答案3:

我会说选择的解决方案太复杂了。开始操纵事件队列不是您通常想要做的事情。

相反,我建议采用完全不同的解决方案。如果你始终打开模式,你可以将退格这样的键绑定到一个函数,该函数可以自行确定它是应该逐个字符还是单词操作。

以下是一个简单的概念验证。它仍然具有进入单词模式的明确功能,但可以将其推广到既能启用单词模式又能执行某种操作的功能。

(defun foo-electric-enabled nil
  "Non-nil when foo-mode operate in word mode.")

(defun foo-electric-delete (&optional arg)
  (interactive "p")
  (if (and foo-electric-enabled
           (memq last-command '(kill-region
                                foo-electric-delete
                                foo-enable-word-operations)))
      (call-interactively 'backward-kill-word)
    (setq foo-electric-enabled nil)
    (call-interactively 'backward-delete-char-untabify)))

(defvar foo-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map [backspace] 'foo-electric-delete)
    map))

(defun foo-enable-word-operations ()
  (interactive)
  (setq foo-electric-enabled t))

(define-minor-mode foo-mode
  "Toggle Foo mode.
With no argument, this command toggles the mode.
Non-null prefix argument turns on the mode.
Null prefix argument turns off the mode.

When Foo mode is enabled, the backspace key
gobbles all preceding whitespace except the last.
See the command \\[foo-electric-delete]."
  ;; The initial value.
  :init-value nil
  ;; The indicator for the mode line.
  :lighter " Foo"
  ;; The minor mode bindings.
  :keymap foo-mode-map
  :group 'foo)

上面的代码可以增强,但我把它作为读者的练习:

  • 不是检查函数是否是文字列表的成员,而是可以有一个模块范围的列表,或者,您可以使用应该被视为您希望保留在单词中的函数的属性模式。

  • 模式线指示器之类的东西总是在开启。通过使用其他次要模式实现此包,您可以使用第二个拥有模式行指示符并指示包处于单词模式,替换foo-electric-enabledfoo-enable-word-operations

  • 功能foo-electric-delete显式调用backward-kill-wordbackword-delete-char-untabify。有许多技术可以分别调用绑定到元退格退格的内容。