emacs - Elisp: Conditionally change keybinding -


i'm trying write custom tab completion implementation tries bunch of different completions depending on point is. however, if none of conditions completions met tab ever current mode intended do.

something this:

(defun my-custom-tab-completion ()   (interactive)   (cond    (some-condition     (do-something))    (some-other-condition     (do-something-else))    (t     (do-whatever-tab-is-supposed-to-do-in-the-current-mode))) ;; how do this?

currently i'm checking specific modes , doing right thing mode, solution right thing without me having explicitly add condition specific mode.

any ideas of how this?

thanks! /erik

you use functions such key-binding (or more specific variants global-key-binding, minor-mode-key-binding , local-key-binding) probe active keymaps bindings.

for example:

(call-interactively (key-binding (kbd "tab"))) ;; in emacs-lisp-mode buffer: ;;    --> indent-for-tab-command ;;  ;; in c++-mode buffer yas/minor-mode: ;;    --> yas/expand

one way avoid infinite loops if command bound tab put binding in minor mode, , temporarily disable keymap while looking tab binding:

(define-minor-mode my-complete-mode   "smart completion"   :keymap (let ((map (make-sparse-keymap)))             (define-key map (kbd "tab") 'my-complete)             map))  (defun my-complete ()   (interactive)   (message "my-complete")   (let ((my-complete-mode nil))     (call-interactively (key-binding (kbd "tab")))))

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