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I'm running emacs 26.3. I want to run a hook every time I switch to a buffer. However, I have not been able to find any kind of "buffer switch hook".

If I want to always run a function when switching to a buffer, do I have to do something like wrapping switch-to-buffer with advice? Or is there some other way to accomplish this?

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If you're using Emacs 27.1 or later, you can use:

C-hv window-selection-change-functions

Use add-hook with the LOCAL argument set a function for a specific buffer.

For more details see C-hig (elisp)Window Hooks

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  • Thank you! I'm on 26.3, as I mentioned ... but I guess it's time for me to upgrade. :)
    – HippoMan
    Nov 28, 2021 at 1:55
  • I managed to miss that, sorry. FWIW you can see the relevant part of the manual online at gnu.org/software/emacs/manual/html_node/elisp/Window-Hooks.html (which still doesn't help unless you upgrade, but in case you wanted to check those docs first).
    – phils
    Nov 28, 2021 at 3:29
  • In 26.3, you could take a look at C-h v buffer-list-update-hook and see if you can carefully bend that to your purposes.
    – phils
    Nov 28, 2021 at 3:31
  • Well, I managed to upgrade fairly painlessly to 27.2, so all is well. Thank you again!
    – HippoMan
    Nov 28, 2021 at 3:35
  • If by "switch to a buffer" you only mean cases when the buffer gets displayed in a window in which it was not already displayed (i.e. a window configuration is going to change in some frame), then you can use a buffer-local window-configuration-change-hook in 26.3.
    – phils
    Nov 28, 2021 at 3:40

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