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I'm trying to read (elisp) `Window Hooks', and I can't make heads or
tails of it.  Throughout this node there's mention of buffer-local
functions: "functions specified buffer-locally".

I have no idea what is meant by this.  I search the Elisp manual for
buffer-local, and I find zillions of matches that are about
buffer-local variables, of course.  And I find a couple of mentions
of buffer-local faces.  No mention, that I can find, of buffer-local
functions or "functions specified buffer-locally".  How to specify a
function buffer-locally?

A wild guess is that what you're trying to say has something to do
with using the LOCAL argument to `add-hook' or `remove-hook`.  But
if so, it's not clear what.

Please clean up this text so it's comprehensible by an average reader.
If buffer-local functions are indeed a thing now, please document what
they are, somewhere.

In GNU Emacs 27.2 (build 1, x86_64-w64-mingw32)
 of 2021-03-26 built on CIRROCUMULUS
Repository revision: deef5efafb70f4b171265b896505b92b6eef24e6
Repository branch: HEAD
Windowing system distributor 'Microsoft Corp.', version 10.0.19042
System Description: Microsoft Windows 10 Pro (v10.0.2009.19042.1288)





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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Drew Adams <drew.adams@HIDDEN>
Subject: bug#51930: Acknowledgement (27.2; Buffer-local functions? Buffers
 specified buffer-locally?)
Message-ID: <handler.51930.B.16371859147925.ack <at> debbugs.gnu.org>
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Reply-To: 51930 <at> debbugs.gnu.org
Date: Wed, 17 Nov 2021 21:52:01 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

This is an automatically generated reply to let you know your message
has been received.

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From: Eli Zaretskii <eliz@HIDDEN>
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> From: Drew Adams <drew.adams@HIDDEN>
> Date: Wed, 17 Nov 2021 21:51:29 +0000
> 
> I'm trying to read (elisp) `Window Hooks', and I can't make heads or
> tails of it.  Throughout this node there's mention of buffer-local
> functions: "functions specified buffer-locally".
> 
> I have no idea what is meant by this.  I search the Elisp manual for
> buffer-local, and I find zillions of matches that are about
> buffer-local variables, of course.  And I find a couple of mentions
> of buffer-local faces.  No mention, that I can find, of buffer-local
> functions or "functions specified buffer-locally".  How to specify a
> function buffer-locally?
> 
> A wild guess is that what you're trying to say has something to do
> with using the LOCAL argument to `add-hook' or `remove-hook`.  But
> if so, it's not clear what.
> 
> Please clean up this text so it's comprehensible by an average reader.
> If buffer-local functions are indeed a thing now, please document what
> they are, somewhere.

This is a very dramatic description of a problem ("can't make heads or
tails", "I have no idea what is meant", etc.), so I'm not sure whether
a simple cross-reference to the documentation of add-hook, which
explains what is meant by "buffer-local" in this case, will solve the
problem.  If it will, doing that is very easy.  In fact, I just did.




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Eli Zaretskii <eliz@HIDDEN> writes:

> This is a very dramatic description of a problem ("can't make heads or
> tails", "I have no idea what is meant", etc.), so I'm not sure whether
> a simple cross-reference to the documentation of add-hook, which
> explains what is meant by "buffer-local" in this case, will solve the
> problem.  If it will, doing that is very easy.  In fact, I just did.

I think "Functions specified buffer-locally" is an unusual way to say
"the buffer-local value of window-buffer-change-functions" -- if indeed
that's what it's trying to say.  I think rewriting this in a less
passive voice would be a good idea:

---
Functions specified buffer-locally are called for any window showing
the corresponding buffer if that window has been created or assigned
that buffer since the last time window change functions were run.  In
this case the window is passed as argument.

Functions specified by the default value are called for a frame if at
least one window on that frame has been added, deleted or assigned
another buffer since the last time window change functions were run.
In this case the frame is passed as argument.
---


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





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