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Re: .dir-locals.el

From: Kevin Rodgers
Subject: Re: .dir-locals.el
Date: Wed, 07 Jan 2009 20:04:23 -0700
User-agent: Thunderbird (Macintosh/20081209)

Eric Schulte wrote:
Is there a good way to apply the variables set in .dir-locals.el when
changing into and out of a directory in eshell (or I suppose in other
Emacs shells as well)?

I've tried setting eshell as a mode in the .dir-locals.el file but with
no success.  I've also tried to define after-advice on the `cd' function
in eshell, but there doesn't appear to be any means for applying local
variables to a buffer which doesn't have a file-name.

(defadvice cd (after dir-locals-on-cd activate)
  "Apply the variables defined in .dir-locals.el when changing
into and outof a directory in eshell."

Fails because `hack-dir-local-variables' checks that the buffer is
visiting a file before applying the variables.

Is there a supported way to do this?

If not should I write a new function for this?

If so should it be included in the dir-locals.el functionality?

If not is there a reason to only allow setting local variables for
buffers visiting files?

I don't know.  But you should be able to get your advice to work by
let-binding buffer-file-name to default-directory around the call to

Or perhaps to (expand-file-name "foo").

Kevin Rodgers
Denver, Colorado, USA

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