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switch-buffer-hook to catch the switch-event?

From: Thorsten Jolitz
Subject: switch-buffer-hook to catch the switch-event?
Date: Tue, 26 Feb 2013 01:41:01 +0100
User-agent: Gnus/5.130002 (Ma Gnus v0.2) Emacs/24.2 (gnu/linux)

Hi List, 

I want to revert a buffer everytime it is switched to (it becomes
current-buffer). Searching the web and the manuals for a related emacs
hook, I found out that someone asked the same question before - but with
no 'positive' answer. 

How can I trigger an action everytime a certain buffer gets the focus
(becomes current-buffer)? Is there no hook for 'switch-buffer' or
something similar?

|   Question: Is there a way to find out that the user has switched to a
|   buffer, i.e., someting like switch-to-buffer-hook? The manual seems to
|   say no, which is surprising. I would like to set some frame-specific
|   variables according to the buffer which has been selected….
|   JoergVolbers?
|      If you don’t need to know when the switch was made, and you just
|      need to know the current buffer, use function ‘current-buffer’. You
|      might also want to look at variable ‘major-mode’ and the hooks
|      ‘change-major-mode-hook’ and ‘after-change-major-mode-hook’. The
|      last of these is in Emacs 22 only. – DrewAdams
| Thank you for the fast reply, but what I want to do is to catch, so to
| speak, the switch-event [...]


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