Whats the best way to clang-format a C/C++/GLSL a buffer on save, that does nothing in the case there is no clang-format file found for a project?


Install the clang-format package and add the following hooks to your emacs init:

(defun clang-format-save-hook-for-this-buffer ()
  "Create a buffer local save hook."
  (add-hook 'before-save-hook
    (lambda ()
        (when (locate-dominating-file "." ".clang-format")
        ;; Continue to save.
    ;; Buffer local hook.

;; Run this for each mode you want to use the hook.
(add-hook 'c-mode-hook (lambda () (clang-format-save-hook-for-this-buffer))
(add-hook 'c++-mode-hook (lambda () (clang-format-save-hook-for-this-buffer))
(add-hook 'glsl-mode-hook (lambda () (clang-format-save-hook-for-this-buffer))
  • For some reason this cases my file to be impossible to save even though it gets formatted. – Martin May 21 '19 at 4:15
  • Fixed, the function needed to evaluate to nil, also only run when .clang-format file is found. – ideasman42 Jun 24 '19 at 2:36
  • Thanks for showing us locate-dominating-file. Would be helpful with flycheck, lsp-mode, etc. where the notion of a project is needed. – legends2k Dec 12 '19 at 11:01

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