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What code do i need to implement in order to create a hook which can be set by the user and which is called in my own function?

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  • You might want to provide an example where you'd want to do that, to clarify your question. – Stefan Oct 10 '20 at 21:31
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Welcome to SE (emacs)! Look up run-hooks which gives the whole story but the tl;dr is expose a hook variable my-fancy-hook to the user and at the right place in yr own code put:

(run-hooks 'my-fancy-hook)

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