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New Package for GNU ELPA

From: Ian Dunn
Subject: New Package for GNU ELPA
Date: Sun, 22 May 2016 12:45:35 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

I'd like to offer my new package, hook-helpers
(https://savannah.nongnu.org/projects/hook-helpers-el/), to GNU ELPA.
I've already filled out copyright paperwork for Emacs.

Often times, I see people define a function to be used once in a hook. If they don’t do this, then it will be an anonymous function. If the anonymous function is modified, then the function can’t be removed. With a function outside of the add-hook call, it looks messy.

The define-hook-helper macro is a solution to this. Think of it as an anaphoric add-hook, but one that can be called many times without risking redundant hook functions. It gives a cleaner look and feel to Emacs configuration files, and could even be used in actual libraries.

The purpose of this package is to build upon add-hook and remove-hook. When you have something like the following:

(defun my/after-init-hook ()
  (set-scroll-bar-mode nil))

You’ve got to remember to actually add this to the after-init-hook variable. Alternatively, you can use a lambda function:

(add-hook 'after-init-hook (lambda () (set-scroll-bar-mode nil)))

But then if you want to modify the function, it’s permanently stuck on the after-init-hook variable, and you have to deal with it. It’s not a problem for after-init-hook, which is used once, but would be a problem for a mode hook, like text-mode-hook.

Instead, hook-helpers can do the following:

(define-hook-helper after-init
  (set-scroll-bar-mode nil))

Which handles everything for you.

Ian Dunn

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