From: Barry Margolin <barmar@alum.mit.edu>
To: help-gnu-emacs@gnu.org
Subject: Re: setenv and find-file
Date: Sat, 18 May 2013 07:36:00 -0400 [thread overview]
Message-ID: <barmar-643C70.07360018052013@news.eternal-september.org> (raw)
In-Reply-To: mailman.27.1368871635.22516.help-gnu-emacs@gnu.org
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In article <mailman.27.1368871635.22516.help-gnu-emacs@gnu.org>,
Peter Dyballa <Peter_Dyballa@Web.DE> wrote:
> Am 17.05.2013 um 23:07 schrieb Doug Lewan:
>
> > I see a problem when M-x find-file is expanding ${VARIABLE} but not taking
> > it from the newly defined environment variable. Everything else picks it up
> > (I presume just via fork/exec).
> >
> > I hope this script is clearer.
> >
> > In shell:
> > $ echo ${VARIABLE}
> > /a/very/long/path
> > $ emacs &
> > Inside emacs:
> > C-x C-f ${VARIABLE}/to/work <== Finds
> > "/a/very/long/path/to/work".
> > (setenv "VARIABLE" "/shorter/path")
> > => "/shorter/path"
> > M-! echo ${VARIABLE}
> > "/shorter/path"
> > M-x shell
> > In shell inside emacs:
> > $ echo ${VARIABLE}
> > "/shorter/path"
> > Back in emacs:
> > C-x C-f ${VARIABLE}/to/Grandmothers/house
> > This finds the file "/a/very/long/path/to/Grandmothers/house", where I sort
> > of expect it to find "/shorter/path/to/Grandmothers/house".
>
> No, this cannot work in GNU Emacs with a regular *shell* buffer maybe it
> works in VIM?
>
> GNU Emacs is a host (or a PC) that allows other programmes to run inside it.
> Every variable the external (whatsoever: Korn, Bourne, C, ) shell
> interpreter is setting, is a private variable of and only inside this shell
> interpreter. And since it's just a shell interpreter it has no access to the
> variables of GNU Emacs. No shell function exists for this purpose.
But if you do:
M-: (setenv "VARIABLE" "/shorter/path")
inside Emacs, you're setting an environment variable in the Emacs
process, not just within a program that's hosted by Emacs.
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
next prev parent reply other threads:[~2013-05-18 11:36 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-17 15:29 setenv and find-file Doug Lewan
2013-05-17 19:14 ` Peter Dyballa
2013-05-17 20:52 ` andrea crotti
2013-05-17 21:07 ` Doug Lewan
2013-05-18 7:34 ` Eli Zaretskii
2013-05-20 11:42 ` Doug Lewan
2013-05-20 12:04 ` setenv and find-file (I take it back.) Doug Lewan
2013-05-18 10:07 ` setenv and find-file Peter Dyballa
[not found] ` <mailman.27.1368871635.22516.help-gnu-emacs@gnu.org>
2013-05-18 11:36 ` Barry Margolin [this message]
2013-05-18 18:09 ` Peter Dyballa
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