define-key
可以接受带引号的字符串或交互式 lambda,如本例所示。
;Static
(define-key evil-normal-state-mapr "m" 'evil-motion-state)
;Conditional
(define-key evil-normal-state-map "m"
(lambda () (interactive) (message "%s" major-mode)))
Lambda 可以用 my-tab-completion 之类的命名函数替换并更有效地使用。
来自定义键的文档字符串(Emacs 25)
DEF is anything that can be a key's definition:
nil (means key is undefined in this keymap),
a command (a Lisp function suitable for interactive calling),
a string (treated as a keyboard macro),
a keymap (to define a prefix key),
a symbol (when the key is looked up, the symbol will stand for its
function definition, which should at that time be one of the above,
or another symbol whose function definition is used, etc.),
a cons (STRING . DEFN), meaning that DEFN is the definition
(DEFN should be a valid definition in its own right),
or a cons (MAP . CHAR), meaning use definition of CHAR in keymap MAP,
or an extended menu item definition.
(See info node `(elisp)Extended Menu Items'.)