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Hooks are an important mechanism for customizing Emacs. A hook is a Lisp variable which holds a list of functions, to be called on some well-defined occasion.

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before-save-hook for cc-mode

I once needed something like that for autocompiling my elisp files when saved, I used a approach like this (converted the approach to cc-mode): (add-hook 'c-common-hook #'(lambda () …
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