From: Giorgos Keramidas <keramida@ceid.upatras.gr>
Cc: emacs-devel@gnu.org
Subject: Re: problem using call-process with grep
Date: Sat, 24 Dec 2005 06:48:09 +0200 [thread overview]
Message-ID: <20051224044809.GA5095@flame.pc> (raw)
In-Reply-To: <DNEMKBNJBGPAOPIJOOICEELHDAAA.drew.adams@oracle.com>
> maybe what arrives at the application level is gamma(,)
> without backslashes
>
> Bingo! Thank you, David.
>
> Don't know why I didn't see this before. I just need to use
> "\\\\" to get \, as is usual with a Lisp string (which this
> is). Sorry for wasting time.
Uh, there is still something wrong here. You wrote:
> > (call-process "grep" nil
> > (generate-new-buffer "Result")
> > nil "epsilon\\($\\)" "foo")
> >
This means that the string is 'epsilon\($\)', and call-process
is supposed to pass this unmolested into grep. So some other
entity is removing a level of backslashes that shouldn't. It is
either call-process, or grep itself.
Hm, you're right. It's as if we had to supply a regexp that would match the
literal string `\('. The Lisp string to do that would be "\\\\(". I just
re-read the doc for `grep' and `call-process'; neither mentions anything
about this.
To figure out whether this is specific to Cygwin `grep' or a property of
`call-process', could someone else (e.g. on GNU/Linux) please try these:
(call-process "/path/to/your/echo" nil t nil "foo\\\\(bar\\\\)")
Using M-: the following expression evaluates to:
(call-process "/bin/echo" nil t nil "foo\\\\(bar\\\\)")
=> 0 (#o0, #x0)
In my Lisp interaction buffer the following is inserted:
foo\\(bar\\)
Evaluating the following expression:
(call-process "/path/to/your/echo" nil t nil "foo\\(bar\\)")
=> 0 (#o0, #x0)
Results in the following line of text:
foo\(bar\)
This is not GNU/Linux but FreeBSD/amd64, FWIW. The results seem
to indicate that there is only one level of escaping here, the
one done by Lisp.
next prev parent reply other threads:[~2005-12-24 4:48 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-22 18:05 Q on call-process and grep Drew Adams
2005-12-23 6:45 ` problem using call-process with grep Drew Adams
2005-12-23 18:11 ` Richard M. Stallman
2005-12-23 18:24 ` Drew Adams
2005-12-23 22:02 ` Kevin Rodgers
2005-12-23 22:18 ` Drew Adams
2005-12-23 22:42 ` David Kastrup
2005-12-23 23:16 ` Drew Adams
2005-12-23 23:20 ` David Kastrup
2005-12-23 23:44 ` Drew Adams
2005-12-23 23:52 ` David Kastrup
2005-12-24 0:42 ` Drew Adams
2005-12-24 4:48 ` Giorgos Keramidas [this message]
2005-12-24 16:32 ` Richard M. Stallman
2005-12-24 16:35 ` Drew Adams
2005-12-24 16:57 ` Eli Zaretskii
2005-12-24 17:08 ` Drew Adams
2005-12-24 17:35 ` Eli Zaretskii
[not found] <jku0cz1e9l.fsf@glug.org>
2005-12-24 1:51 ` Drew Adams
2005-12-24 11:56 ` Eli Zaretskii
2005-12-24 15:48 ` Drew Adams
2005-12-24 16:36 ` Eli Zaretskii
2005-12-24 16:39 ` Drew Adams
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