From: David Kastrup <dak@gnu.org>
Cc: rms@gnu.org, emacs-devel@gnu.org
Subject: Re: grep-use-null-device
Date: Tue, 16 Aug 2005 11:26:22 +0200 [thread overview]
Message-ID: <85vf26dygx.fsf@lola.goethe.zz> (raw)
In-Reply-To: <u17jemnyis.fsf@tiscali.de> (Emilio Lopes's message of "Tue, 16 Aug 2005 09:15:07 +0200")
Emilio Lopes <eclig@gmx.net> writes:
> Emilio Lopes writes:
>
>> As a result, if I forget to provide a filename to "M-x grep" it will
>> run forever, waiting for me to kill it.
>
> Richard M Stallman writes:
>
>> So, my grep program supports "-H" but it apparently has not the
>> expected semantics.
>
>> That is a very vague statement. It tells us nothing.
>
> No, no. It's very concrete if you consider the rest of the message,
> which you didn't quote. Anyway, I understand the problem better now.
>
> If the user forgets to provide a filename to "M-x grep" (as in
> "grep.-nH.foo") it will run indefinitely waiting for input from
> stdin until killed. In such cases it's useful to have `null-device'
> appended, even if the grep program supports the option "-H" (which
> has an other purpose anyway).
>
> One could even argue if Emacs should not append *two* instances of
> `null-device', in the case the use just press enter at the grep prompt
> without even typing a regexp.
I think what rather should be done is that standard input on the grep
process gets closed. That requires no special options, and it will
lead to a sensible result without obscure extra options.
grep-use-null-device is just for getting file names on matches, not
for dealing with bad commands.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
next prev parent reply other threads:[~2005-08-16 9:26 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-15 15:41 grep-use-null-device Emilio Lopes
2005-08-16 2:25 ` grep-use-null-device Richard M. Stallman
2005-08-16 11:46 ` grep-use-null-device Karl Chen
2005-08-16 16:20 ` grep-use-null-device Emilio Lopes
2005-08-17 6:25 ` grep-use-null-device Richard M. Stallman
2005-08-20 12:22 ` grep-use-null-device Eli Zaretskii
2005-08-27 1:30 ` "^D^H^H" in process output on Darwin (Was Re: grep-use-null-device) YAMAMOTO Mitsuharu
2005-08-29 13:56 ` "^D^H^H" in process output on Darwin Stefan Monnier
2005-09-13 8:21 ` Nozomu Ando
2005-09-17 1:33 ` YAMAMOTO Mitsuharu
2005-08-29 22:43 ` grep-use-null-device Juri Linkov
2005-08-30 10:30 ` grep-use-null-device Richard M. Stallman
2005-08-31 2:31 ` grep-use-null-device Stefan Monnier
2005-08-31 6:02 ` grep-use-null-device Juri Linkov
2005-09-01 14:59 ` grep-use-null-device Stefan Monnier
2005-09-01 16:16 ` grep-use-null-device David Kastrup
2005-09-01 18:18 ` grep-use-null-device Stefan Monnier
2005-09-03 1:43 ` grep-use-null-device Richard M. Stallman
2005-08-16 7:15 ` grep-use-null-device Emilio Lopes
2005-08-16 9:26 ` David Kastrup [this message]
2005-08-16 16:29 ` grep-use-null-device Emilio Lopes
2005-08-16 9:45 ` grep-use-null-device Juri Linkov
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