this post was submitted on 13 Nov 2023
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Any way to make a variable save its old value? (alien.top)
submitted 10 months ago by field_thought_slight@alien.top to c/emacs
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I'm wondering if there's any way to make a variable automatically save its old value, so that I can, e.g., write a minor mode that will automatically restore the old values of variables when it's deactivated (without having to declare a bunch of -old-value variables).

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[–] fuzzbomb23@alien.top 1 points 10 months ago

Have a look at the approach taken by the logos.el package. There's a section in the manual called Leverage logos-focus-mode-hook.

The idea there is that when you enable the logos-focus-mode, you'll often want to change some other minor modes and variables too. But when you disable logos-focus-mode, you'll want those other minor modes to revert to their previous value. The Logos package provides a few convenience functions to remember the previous values, and they are automatically restored when logos-focus-mode is turned off.

Perhaps the code for that could be made generic, instead of being coupled to the logos-focus-mode?