Emacs auto-complete backend for CIDER
Emacs Lisp
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ac-cider is a completion source for Emacs auto-complete package that uses CIDER (and Compliment) as candidates provider.

ac-cider is the successor of the now deprecated ac-nrepl which uses clojure-complete as backend.


ac-cider is available as a package in MELPA repository. You can install it from there like:

M-x package-install ac-cider

ac-cider depends on auto-complete and cider which will be downloaded automatically.

ac-cider provides a CIDER-specific completion source, so auto-complete needs to be told to use it when cider-mode is active. To do this, put the following code in your Emacs init file:

(require 'ac-cider)
(add-hook 'cider-mode-hook 'ac-flyspell-workaround)
(add-hook 'cider-mode-hook 'ac-cider-setup)
(add-hook 'cider-repl-mode-hook 'ac-cider-setup)
(eval-after-load "auto-complete"
     (add-to-list 'ac-modes 'cider-mode)
     (add-to-list 'ac-modes 'cider-repl-mode)))

By default, entries in the popup menu will also display the namespace that the symbol belongs to. To disable this behavior, add to your init file:

(setq ac-cider-show-ns nil)

If you want to trigger auto-complete using TAB in CIDER buffers, add this to your configuration file (but note that it is incompatible with (setq tab-always-indent 'complete)):

(defun set-auto-complete-as-completion-at-point-function ()
  (setq completion-at-point-functions '(auto-complete)))

(add-hook 'auto-complete-mode-hook 'set-auto-complete-as-completion-at-point-function)
(add-hook 'cider-mode-hook 'set-auto-complete-as-completion-at-point-function)


ac-cider should now automatically be enabled when you visit a buffer in which cider-mode is active and auto-complete is enabled. (The symbols “cider” and “AC” should appear in the modeline.)

Simply trigger auto-completion, and completion candidates supplied by CIDER should be displayed. After a short delay, popup documentation for the completed symbol should also be displayed.