From: yary <not.com@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: 15577 <15577@debbugs.gnu.org>
Subject: bug#15577: 24.3; dir-local variables not applied when switching major-mode
Date: Fri, 18 Oct 2013 11:43:54 -0400 [thread overview]
Message-ID: <CAG2CFAY1k+kgqD_kdwp5GchofY+1ZZe=U8AnxtgtXi4JViGP5g@mail.gmail.com> (raw)
In-Reply-To: <CAG2CFAbF7qFO6+M3QJ_BhPurBOoYnysKOO8Gnkf-qCg0MhCOxw@mail.gmail.com>
My implementation thoughts for core-level fixes, after working on
personal workarounds.
For sub-issue #1 "dir-locals not being applied in the new mode,"
divide the responsibility for setting file-locals and dir-locals
between `normal-mode find-file=t' and `define-derived-mode'. Just have
`define-derived-mode' call
`(hack-dir-local-variables)(hack-local-variables-apply)' unless it is
being called as a result of `normal-mode t'. There's no change needed
for the normal-mode function or anything it calls, except perhaps
setting something that the define-derived-mode macro can check.
For sub-issue #2 "an easier way for us to preserve minor-modes and
buffer-local variables when switching modes"- I discovered this
exchange showing it's been raised before
https://lists.gnu.org/archive/html/emacs-devel/2007-12/msg00366.html
which resulted in adding the property `permanent-local-hook' to
compliment the `permanent-local' property, facilitating minor-mode
preservation. That was in the context of helping mode authors preserve
specific minor-modes. In itself, it isn't enough for a generic
minor-mode preservation but it can help.
A function to preserve any minor-mode needs to
a. Get all of that mode's customizable buffer-locals. Ideally the
minor-mode, or emacs core, would provide a function for that purpose.
If not, might be able to reliably get a list by creating a scratch
buffer, saving results of `buffer-local-variables', enabling the minor
mode in question, then mark the differences from a subsequent call to
`buffer-local-variables'.
b. Mark those variables as permanent-local
Then either
b1. Continue to allow major-mode changes to disable all minor-modes,
but re-enable the user-requested minor-modes after calling
kill-all-local-variables. This doesn't require any use of
`permanent-local-hook'; the minor mode is being disabled and
re-enabled and any hooks can be normally uninstalled & re-installed &
re-run
b2. Apply `permanent-local-hook' to all the minor-mode's hook
functions. The minor mode might provide those symbols via a function
for that purpose, or perhaps they could be auto-discovered.
Alas I don't yet know enough about Emacs' minor-mode handling to get
further with these thoughts. Thanks for bearing with me.
-y
next prev parent reply other threads:[~2013-10-18 15:43 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-09 20:14 bug#15577: 24.3; dir-local variables not applied when switching major-mode yary
2013-10-09 21:42 ` Glenn Morris
2013-10-10 18:34 ` yary
2013-10-10 21:27 ` Glenn Morris
2013-10-10 21:52 ` Stefan Monnier
2013-10-10 23:12 ` yary
2013-10-14 18:41 ` yary
2013-10-16 14:26 ` yary
2013-10-18 15:43 ` yary [this message]
2013-10-19 1:18 ` Stefan Monnier
2013-10-19 19:08 ` yary
2013-10-19 21:55 ` Stefan Monnier
2013-10-20 13:00 ` yary
2013-10-20 13:38 ` Phil Sainty
2013-10-21 13:11 ` Stefan Monnier
2013-10-21 13:23 ` yary
2013-10-21 14:23 ` Stefan Monnier
2013-10-21 21:58 ` Phil Sainty
2013-10-18 16:29 ` Phil Sainty
[not found] ` <mailman.3789.1381430919.10748.bug-gnu-emacs@gnu.org>
2016-05-05 11:26 ` Alan Mackenzie
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