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bind a keymap to multi-keys #3

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bind a keymap to multi-keys #3

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32 changes: 28 additions & 4 deletions multi-keys.el
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,18 @@ If this function finds nothing, it returns nil."
;; else
nil)))

(defun multi-keys--call-keymap (map &optional prompt)
;; from http://stackoverflow.com/a/24916987
"Read a key sequence and call the command it's bound to in MAP."
;; Note: MAP must be a symbol so we can trick `describe-bindings' into giving
;; us a nice help text.
(let* ((overriding-local-map `(keymap (,map . ,map)))
(help-form `(describe-bindings ,(vector map)))
(key (read-key-sequence prompt))
(cmd (lookup-key (symbol-value map) key t)))
(if (functionp cmd) (call-interactively cmd)
(user-error "%s is undefined" key))))

(defun multi-keys-maybe-translate (prompt)
"Translate two key press into a key chord.

Expand Down Expand Up @@ -185,16 +197,28 @@ same. Currently only elements that corresponds to ascii codes in
the range 32 to 126 can be used.

If COMMAND is nil, the multi-keys is removed. Notice that it
can't unset key defination in `key-translation-map'."
can't unset key defination in `key-translation-map'.

If COMMAND is a symbol of keymap, the KEYS will be a prefix of
the keymap."
(unless (and (stringp keys) (= (length keys) 2))
(error "Keys must be a two-char-string"))
(let ((key1 (logand 255 (aref keys 0)))
(key2 (logand 255 (aref keys 1))))
(key2 (logand 255 (aref keys 1)))
(to-be-called (cond
((commandp command)
command)
((and (symbolp command) (keymapp (symbol-value command)))
(lambda ()
(interactive)
(multi-keys--call-keymap
command (concat "Enter a " (symbol-name command) " command: "))))
(t (user-error "Command must be a command or a symbol of keymap")))))
(if (eq key1 key2)
(error "Keys can't be the same.")
;; else
(multi-keys--bind-key keymap (vector 'multi-keys key1 key2) command)
(multi-keys--bind-key keymap (vector 'multi-keys key2 key1) command))))
(multi-keys--bind-key keymap (vector 'multi-keys key1 key2) to-be-called)
(multi-keys--bind-key keymap (vector 'multi-keys key2 key1) to-be-called))))

(defun multi-keys--bind-key (keymap keys command)
(define-key key-translation-map (cl-subseq keys 1 2)
Expand Down