Emacs With Yasnippet And Autocompletion

YASnippet is a template system for Emacs. It allows you to type an abbreviation and automatically expand it into function templates. Bundled language templates include: C, C++, C#, Perl, Python, Ruby, SQL, LaTeX, HTML, CSS and more.

Installation of Yasnippet and Autocomplete

First, install yasnippet and autocomplete with the emacs package managder.

Then, add the following code into the .emacs:

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;;; yasnippet
;;; should be loaded before auto complete so that they can work together
(require 'yasnippet)
(yas-global-mode 1)
;;; auto complete mod
;;; should be loaded after yasnippet so that they can work together
(require 'auto-complete-config)
(add-to-list 'ac-dictionary-directories "~/.emacs.d/ac-dict")
(ac-config-default)
;;; set the trigger key so that it can work together with yasnippet on tab key,
;;; if the word exists in yasnippet, pressing tab will cause yasnippet to
;;; activate, otherwise, auto-complete will
(ac-set-trigger-key "TAB")
(ac-set-trigger-key "<tab>")

Now, reload the init file with M-x eval-region RET to make changes take effect.

After that, every time you press TAB, yasnippet will run first searching for snippet, if failed, the autocomplete will be activated.

C++ Autocompletion with Clang

In order to autocomplete codes with Clang, you need first install Clang on your system. Then install the auto-complete-clang with the emacs package managder.

After that, add the following code into the .emacs:

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(require 'auto-complete-clang)
(define-key c++-mode-map (kbd "C-S-<return>") 'ac-complete-clang)
;; replace C-S-<return> with a key binding that you want

(require 'auto-complete)

Now, reload the init file with M-x eval-region RET to make changes take effect.