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Re: server-local variables

From: Ted Zlatanov
Subject: Re: server-local variables
Date: Tue, 01 Nov 2016 09:22:37 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

On Mon, 31 Oct 2016 21:47:32 +0100 Michael Albinus <address@hidden> wrote: 

MA> Ted Zlatanov <address@hidden> writes:

>> (with-process-classes temporary-sudo-override temporary-shell-override
>> ansible-host-environment
>> ...do something)
>> It would take care of setting the connection-local variables inside the
>> scope and unwinding them afterwards.

MA> I see. The problem is unwinding the local variables; they could exist
MA> already as local variables when entering the macro. But in general it
MA> shall be possible, when implementing proper book-keeping.

That would be great, thank you for considering it.

MA> Btw, I wouldn't call it with-*process*-classes. server-local (or
MA> connection-local) variables could be applied to any buffer with a remote
MA> default-directory.

Any name is fine with me. It's really a pattern match against some
buffer characteristics and has a lot in common with file-and-dir-local
variables (which pattern match against the file location).

>> OK, please take a look at the GnuTLS glue code in gnutls.el and you'll
>> see what I need from this facility. I'm happy to start using it there as
>> soon as the API is solidified. I have a TODO item (discussed with Lars a
>> few months ago) to implement something like this facility so it's great
>> to see it's not an isolated need :)

MA> I've looked shortly on this. Seems like you need a mechanism for
MA> `gnutls-boot-parameters'.

Yes, exactly. It needs to be flexible and augmentable to allow layering
of GnuTLS options; currently it's pretty much the opposite.

The GnuTLS priority strings, which are on the C side, have interesting
parallels with your concept of classes that represent sets of parameters.


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