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RE: Auto Fill Comments
From: |
Drew Adams |
Subject: |
RE: Auto Fill Comments |
Date: |
Mon, 30 Nov 2020 14:45:27 -0800 (PST) |
> I understand that local variables are meant for buffer customization
> that
> one uses most often in mode hooks. There has been some
> misunderstanding.
>
> By not very good I meant: Can we have a typical example and how it
> would look like.
> I mean, rather than with foo, bar, a, g, temp, body. For instance,
> making a command
> for some particular mode buffer, and a brief description of what is
> achieved. Apologies
> should I not understand how hard that can be. Hope my comment helps
> transmit what I mean
> better.
It doesn't get any more specific than this, IMO:
`C-x f' aka `M-x set-fill-column'.
Tada! Variable `fill-column' just got its value
updated for the current buffer.
`C-h f' tells you that that command sets var
`fill-column'.
Clicking that var name in *Help* then tells you
that the var:
Automatically becomes buffer-local when set.
^^^^^^^^^^^^^
That is, this particular variable is ALWAYS
buffer-local - its value is separate for each
buffer.
What does "automatically" mean here? It means
that to make it buffer-local you don't need to
do anything - you have no choice: it's
buffer-local in every buffer.
Why would that be the case for `fill-column'?
Because we figure it makes sense to always give
it a buffer-local value, that's all.
You can set the _default_ value for all buffers
using Customize (as the doc string tells you).
E.g., customize `fill-column' to 71, and if
nothing sets it to something different in a
given buffer then it'll be 71.
Most variables that might have buffer-local
values in some buffers do NOT automatically
become buffer-local in every buffer. That is,
they are not "automatically" buffer-local.
They become buffer-local for a given buffer
only if something explicitly makes them
buffer-local there, e.g., using function
`make-local-variable'.
To make a variable ALWAYS (i.e.,
"automatically") be buffer-local (i.e., in
all buffers) you use the stronger function
`make-variable-buffer-local'. The doc strings
(`C-h f') of those two functions tell you all
of this.
(`make-local-variable' might be more precisely
named `give-var-a-separate-value-in-THIS-buffer'.)
And yes (sigh), I'm just repeating what the
help and doc say better. RTFM really is your
friend, you know. ;-)
- Re: Auto Fill Comments, (continued)
- Re: Auto Fill Comments, Jean Louis, 2020/11/30
- Re: Auto Fill Comments, Michael Heerdegen, 2020/11/30
- Re: Auto Fill Comments, Christopher Dimech, 2020/11/30
- Re: Auto Fill Comments, tomas, 2020/11/30
- Re: Auto Fill Comments, Stefan Monnier, 2020/11/30
- Re: Auto Fill Comments, Christopher Dimech, 2020/11/30
- RE: Auto Fill Comments,
Drew Adams <=
- Re: RE: Auto Fill Comments, Christopher Dimech, 2020/11/30
- Re: Auto Fill Comments, Michael Heerdegen, 2020/11/30
- Re: Auto Fill Comments, Christopher Dimech, 2020/11/30
- Re: Auto Fill Comments, Yuri Khan, 2020/11/29
- Re: Auto Fill Comments, Christopher Dimech, 2020/11/29
- Re: Auto Fill Comments, Christopher Dimech, 2020/11/28
- Re: Auto Fill Comments, Eli Zaretskii, 2020/11/28
- Re: Auto Fill Comments, Christopher Dimech, 2020/11/28
- Re: Auto Fill Comments, Arthur Miller, 2020/11/28
- RE: Auto Fill Comments, Drew Adams, 2020/11/27