Emacs中使用company + irony实现C++代码补全

尝试过好多代码补全插件，目前找到一款用着比较满意的，前端用company，后端主要用irony，基本上对于C/C++项目来说使用体验非常好，其他语言的未体验过。

下面是主要配置，一些插件可能需要emacs版本 >= 25.1

;; 代码补全的配置
;; ===================================================
(require 'company)
(require 'irony)
(require 'company-irony)
(add-hook 'c++-mode-hook 'company-mode)
(add-hook 'c-mode-hook 'company-mode)
(add-hook 'c++-mode-hook 'irony-mode)
(add-hook 'c-mode-hook 'irony-mode)
(add-hook 'irony-mode-hook 'irony-cdb-autosetup-compile-options)
(setq company-idle-delay 0)
(setq company-minimum-prefix-length 2)
(setq company-dabbrev-downcase nil)
(add-to-list 'company-backends 'company-dabbrev)
(add-to-list 'company-backends 'company-dabbrev-code)
(add-to-list 'company-backends 'company-files)
(add-to-list 'company-backends 'company-semantic)
(add-to-list 'company-backends 'company-keywords)
(add-to-list 'company-backends 'company-irony)
;;(add-to-list 'company-backends 'company-gtags)
(add-to-list 'company-backends 'company-capf)
(require 'company-c-headers)
(add-to-list 'company-c-headers-path-system "/usr/include/c++/4.9.2/")
(add-to-list 'company-backends 'company-c-headers)
(global-set-key (kbd "C-;") 'company-complete-common)
;;使用M-n 和 M-p 选择候选项
;;company 颜色设置
(defun theme-dark ()
  (interactive)
   (set-face-foreground 'company-tooltip "#000")
    (set-face-background 'company-tooltip "#fff")
     (set-face-foreground 'company-scrollbar-bg "#fff")
      (set-face-background 'company-scrollbar-fg "#999")
)
(theme-dark)

对于Irony的话，需要在emacs中手动执行 M-x irony-install-server 来安装好irony的后端server。

另外有了irony和company-c-headers之后，如果你用的是一个大型项目，那么company-gtags就不需要了，因为company-gtags会使得大型项目下company的提升项居多，貌似是将当前项目所有的符号都作为备选了（也可能是我没配置对）。

 

参考：

http://cachestocaches.com/2015/8/c-completion-emacs/