From: David Kastrup <dak@gnu.org>
Cc: miles@gnu.org, snogglethorpe@gmail.com, teirllm@dms.auburn.edu,
rms@gnu.org, emacs-devel@gnu.org
Subject: Re: file-name-shadow-mode
Date: Thu, 24 Mar 2005 01:04:08 +0100 [thread overview]
Message-ID: <x5d5tpucxz.fsf@lola.goethe.zz> (raw)
In-Reply-To: <jwvu0n2jaau.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Wed, 23 Mar 2005 17:55:28 -0500")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> How 'bout the patch below which makes no assumption (that I know of) about
>> substitute-in-file-name, and will thus work correctly even with weird
>> magic file name handlers.
>
> Regarding performance of my code: I just bumped into a performance
> problem. The problem is that substitute-in-file-name can take a
> non-negligible amount of time to execute when there's a "~user" in
> the file name, because it calls getpwnam to figure out whether
> "user" actually exists or not.
>
> At least here with 8K users in our YP database, my code causes
> file-name-shadow-mode to take around 0.5-1s to refresh the screen
> after each key stroke if there's a ~user in the file name I'm
> editing.
You have seen Richard's proposal of going backwards linearly from the
end and only checking at the "critical" characters like ~, / and $?
It should also be possible to cache a piece of the last shadowing
action and don't look again if no "critical" character has been added
after the previous one in the nonshadowed section.
But actually, I think my proposal about a C level interface into
substitute-in-file-name would be most efficient, robust and
unproblematic in the long run, and possibly useful for other
applications as well.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
next prev parent reply other threads:[~2005-03-24 0:04 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-17 9:16 file-name-shadow-mode David Kastrup
2005-03-17 12:16 ` file-name-shadow-mode Matt Hodges
2005-03-18 1:56 ` file-name-shadow-mode Miles Bader
2005-03-18 1:59 ` file-name-shadow-mode Miles Bader
2005-03-18 2:17 ` file-name-shadow-mode Nick Roberts
2005-03-18 4:35 ` file-name-shadow-mode Luc Teirlinck
2005-03-18 4:47 ` file-name-shadow-mode Stefan Monnier
2005-03-18 4:55 ` file-name-shadow-mode Luc Teirlinck
2005-03-18 5:18 ` file-name-shadow-mode Luc Teirlinck
2005-03-18 5:37 ` file-name-shadow-mode Luc Teirlinck
2005-03-18 18:20 ` file-name-shadow-mode Richard Stallman
2005-03-19 15:21 ` file-name-shadow-mode Luc Teirlinck
2005-03-19 15:45 ` file-name-shadow-mode David Kastrup
2005-03-19 16:45 ` file-name-shadow-mode Stefan Monnier
2005-03-20 2:14 ` file-name-shadow-mode Luc Teirlinck
2005-03-20 14:13 ` file-name-shadow-mode Stefan Monnier
2005-03-20 16:02 ` file-name-shadow-mode Luc Teirlinck
2005-03-20 16:18 ` file-name-shadow-mode Luc Teirlinck
2005-03-20 2:30 ` file-name-shadow-mode Luc Teirlinck
2005-03-20 3:33 ` file-name-shadow-mode Miles Bader
2005-03-20 4:28 ` file-name-shadow-mode David Kastrup
2005-03-20 17:30 ` file-name-shadow-mode Luc Teirlinck
2005-03-20 18:10 ` file-name-shadow-mode David Kastrup
2005-03-21 1:19 ` file-name-shadow-mode Richard Stallman
2005-03-20 18:01 ` file-name-shadow-mode Richard Stallman
2005-03-20 18:24 ` file-name-shadow-mode Luc Teirlinck
2005-03-20 18:47 ` file-name-shadow-mode David Kastrup
2005-03-20 21:11 ` file-name-shadow-mode Luc Teirlinck
2005-03-20 21:25 ` file-name-shadow-mode Luc Teirlinck
2005-03-21 13:44 ` file-name-shadow-mode Stefan Monnier
2005-03-21 22:24 ` file-name-shadow-mode Luc Teirlinck
2005-03-21 23:00 ` file-name-shadow-mode Stefan Monnier
2005-03-22 20:44 ` file-name-shadow-mode Richard Stallman
2005-03-28 21:32 ` file-name-shadow-mode Stefan Monnier
2005-03-21 13:24 ` file-name-shadow-mode Stefan Monnier
2005-03-21 14:05 ` file-name-shadow-mode David Kastrup
2005-03-21 16:48 ` file-name-shadow-mode Stefan Monnier
2005-03-22 3:34 ` file-name-shadow-mode Richard Stallman
2005-03-21 14:26 ` file-name-shadow-mode Miles Bader
2005-03-21 15:14 ` file-name-shadow-mode David Kastrup
2005-03-21 15:47 ` file-name-shadow-mode David Kastrup
2005-03-21 16:58 ` file-name-shadow-mode Stefan Monnier
2005-03-21 23:57 ` file-name-shadow-mode Luc Teirlinck
2005-03-23 22:55 ` file-name-shadow-mode Stefan Monnier
2005-03-24 0:04 ` David Kastrup [this message]
2005-03-25 6:42 ` file-name-shadow-mode Richard Stallman
2005-03-25 8:45 ` file-name-shadow-mode David Kastrup
2005-03-18 5:23 ` file-name-shadow-mode Richard Stallman
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