; kill buffer with :k
(add-to-list 'evil-ex-commands '("kill" . kill-this-buffer))
(add-to-list 'evil-ex-commands '("k" . "kill"))

; tangle buffer with :t
(add-to-list 'evil-ex-commands '("tangle" . org-babel-tangle))
(add-to-list 'evil-ex-commands '("t" . "tangle"))