如何设置clang-format (编码时自动格式化代码，不做任何事情)？

Question

我正在尝试安装clang-format自动格式化工具，我已经用M-x package-install clang-format安装了clang-format，我可以在M-x list-packages中看到它。

我的~/.emacs是：

(require 'package)
(let* ((no-ssl (and (memq system-type '(windows-nt ms-dos))
                    (not (gnutls-available-p))))
       (proto (if no-ssl "http" "https")))
  (when no-ssl
    (warn "\
Your version of Emacs does not support SSL connections,
which is unsafe because it allows man-in-the-middle attacks.
There are two things you can do about this warning:
1. Install an Emacs version that does support SSL and be safe.
2. Remove this warning from your init file so you won't see it again."))
  ;; Comment/uncomment these two lines to enable/disable MELPA and MELPA Stable as desired
  (add-to-list 'package-archives (cons "melpa" (concat proto "://melpa.org/packages/")) t)
  ;;(add-to-list 'package-archives (cons "melpa-stable" (concat proto "://stable.melpa.org/packages/")) t)
  (when (< emacs-major-version 24)
    ;; For important compatibility libraries like cl-lib
    (add-to-list 'package-archives (cons "gnu" (concat proto "://elpa.gnu.org/packages/")))))
(package-initialize)

;; clang-format
(require 'clang-format)
(global-set-key [C-M-tab] 'clang-format-region)
(add-hook 'c-mode-common-hook
           (function (lambda ()
                    (add-hook 'write-contents-functions
                              (lambda() (progn (clang-format-buffer) nil))))))

 (add-hook 'cpp-mode-common-hook
          (function (lambda ()
                      (add-hook 'write-contents-functions
                                (lambda() (progn (clang-format-buffer) nil))))))


;; irony-mode
(add-hook 'c++-mode-hook 'irony-mode)
(add-hook 'c-mode-hook 'irony-mode)
(add-hook 'objc-mode-hook 'irony-mode)
(add-hook 'irony-mode-hook 'irony-cdb-autosetup-compile-options)

;; company mode
(add-hook 'c++-mode-hook 'company-mode)
(add-hook 'c-mode-hook 'company-mode)

;; flycheck-mode
(add-hook 'c++-mode-hook 'flycheck-mode)
(add-hook 'c-mode-hook 'flycheck-mode)
(eval-after-load 'flycheck
'(add-hook 'flycheck-mode-hook #'flycheck-irony-setup))

;; eldoc-mode
(add-hook 'irony-mode-hook 'irony-eldoc)

(global-linum-mode)
(custom-set-variables
 ;; custom-set-variables was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(package-selected-packages
   (quote
    (list-packages-ext clang-format flycheck-clang-tidy flycheck-clang-analyzer elpy irony-eldoc company-irony flycheck-irony flycheck irony))))
(custom-set-faces
 ;; custom-set-faces was added by Custom.

 '(linum ((t (:inherit (shadow default) :foreground "yellow")))))

但是在emacs窗口的底部没有出现clang-format，而出现了Irony，FlyC，ElDoc和Abbrev。

有人能帮帮我吗？谢谢!

Answer 1

从clang-format github指令中：

(require 'clang-format)
(global-set-key (kbd "C-c i") 'clang-format-region)
(global-set-key (kbd "C-c u") 'clang-format-buffer)

(setq clang-format-style-option "llvm")

它不会出现在状态行中，因为它不是次要模式。您必须为您想要使用的函数设置键绑定，就像在给定的示例中一样。