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Re: Multiple M-x shells sharing input ring

From: Michael Heerdegen
Subject: Re: Multiple M-x shells sharing input ring
Date: Thu, 04 Sep 2014 22:40:48 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

Drew Adams <address@hidden> writes:

> Too bad that `comint-input-ring' is "permanent local".
> Should it be, or is that a bug?

The variable is made local in the comint code with

Since very different modes are based on comint, making such vars
permanently local seems ok in this case.  You probably don't want to
share an input history between a shell and a scheme buffer.  Using a
global variable is not a good idea here.

> It does not sound to me like `comint-input-ring' fits that description
> at all.
> Anyway, presumably you could remove its permanent-local status, by
> removing property `permanent-local' from symbol `comint-input-ring'.
> Then you should be able to use `kill-local-variable', to have all
> comint buffers share the same variable (value).  (Dunno whether that
> is what is what Joseph wants.)

It's not that easy, since `comint-mode' does a lot of explicit
`make-local-variable' calls including for `comint-input-ring'.


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