From: "Johan Bockgård" <bojohan@gnu.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: On removing some obsolete code from subr and core
Date: Mon, 07 Nov 2016 22:32:51 +0100 [thread overview]
Message-ID: <8737j3j7r0.fsf@gnu.org> (raw)
In-Reply-To: <jwvy40vqbw7.fsf-monnier+gmane.emacs.devel@gnu.org> (Stefan Monnier's message of "Mon, 07 Nov 2016 15:31:08 -0500")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> you or someone else know better why the default-FOO variables might be
>> needed again,
>
> The only reason would be backward compatibility.
>
>> or why they were implemented in the first place.
>
> I'm pretty sure it's for historical reasons.
NEWS.18 says this:
** Built-in per-buffer variables improved.
Several built-in variables which in the past had a different value in
each buffer now behave exactly as if `make-variable-buffer-local' had
been done to them.
These variables are `tab-width', `ctl-arrow', `truncate-lines',
`fill-column', `left-margin', `mode-line-format', `abbrev-mode',
`overwrite-mode', `case-fold-search', `auto-fill-hook',
`selective-display', `selective-display-ellipses'.
To be precise, each variable has a default value which shows through
in most buffers and can be accessed with `default-value' and set with
`set-default'. Setting the variable with `setq' makes the variable
local to the current buffer. Changing the default value has retroactive
effect on all buffers in which the variable is not local.
The variables `default-case-fold-search', etc., are now obsolete.
They now refer to the default value of the variable, which is not
quite the same behavior as before, but it should enable old init files
to continue to work.
and the old behavior was this, according to Emacs 17 Antinews:
The function setq-default has been eliminated. Use set-default and quote
the variable name, as in
(set-default 'variable value)
Several built-in variables now are always local to all buffers. These
variables are tab-width, ctl-arrow, truncate-lines, fill-column,
left-margin, mode-line-format, abbrev-mode, overwrite-mode,
case-fold-search, auto-fill-hook, selective-display. set-default does not
work with these variables. They do have defaults, but the defaults affect
only buffers yet to be created. The only way to set the default for
variable foo is to set the variable named default-foo, such as
default-case-fold-search and default-fill-column.
next prev parent reply other threads:[~2016-11-07 21:32 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-04 16:59 On removing some obsolete code from subr and core Mark Oteiza
2016-11-05 8:24 ` John Wiegley
2016-11-05 8:34 ` Eli Zaretskii
2016-11-05 13:50 ` Mark Oteiza
2016-11-05 17:59 ` Eli Zaretskii
2016-11-06 16:58 ` Mark Oteiza
2016-11-05 17:50 ` Stefan Monnier
2016-11-06 17:05 ` Mark Oteiza
2016-11-06 22:32 ` Stefan Monnier
2016-11-07 0:32 ` Mark Oteiza
2016-11-07 3:35 ` Eli Zaretskii
2016-11-07 4:24 ` Mark Oteiza
2016-11-07 15:11 ` Eli Zaretskii
2016-11-07 20:08 ` Mark Oteiza
2016-11-07 20:13 ` Eli Zaretskii
2016-11-07 20:25 ` Mark Oteiza
2016-11-08 6:51 ` Noam Postavsky
2016-11-07 20:31 ` Stefan Monnier
2016-11-07 21:32 ` Johan Bockgård [this message]
2016-11-08 13:00 ` Stefan Monnier
2016-11-08 19:49 ` John Wiegley
2016-11-05 15:51 ` Clément Pit--Claudel
2016-11-05 15:52 ` Clément Pit--Claudel
2016-11-05 16:42 ` Dmitry Gutov
2016-11-05 17:23 ` Clément Pit--Claudel
2016-11-05 17:31 ` Dmitry Gutov
2016-11-05 18:03 ` Clément Pit--Claudel
2016-11-05 15:57 ` Clément Pit--Claudel
2016-11-05 17:56 ` Stefan Monnier
2016-11-05 19:14 ` Clément Pit--Claudel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8737j3j7r0.fsf@gnu.org \
--to=bojohan@gnu.org \
--cc=emacs-devel@gnu.org \
--cc=monnier@iro.umontreal.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.