From: Juri Linkov <juri@jurta.org>
To: Ted Zlatanov <tzz@lifelogs.com>
Cc: emacs-devel@gnu.org
Subject: Re: occur API change proposal
Date: Sat, 01 Dec 2007 02:34:35 +0200 [thread overview]
Message-ID: <87fxyni898.fsf@jurta.org> (raw)
In-Reply-To: <861wa92g6a.fsf@lifelogs.com> (Ted Zlatanov's message of "Thu, 29 Nov 2007 10:02:37 -0600")
> I propose changing the occur API to allow an optional predicate
> function. For example, this is useful to invert a regular expression so
> you don't have to run occur on the whole buffer matching everything,
> then limit the results.
The occur engine currently hard-codes the function call of
`re-search-forward'. Instead of this, we could do the same
as is done already in isearch for customization of the search
function using a variable `isearch-search-fun-function', and
add a new analogous variable `occur-fun-function'.
Even though such a variable will be useful for other purposes,
no simple function will allow inverting a regular expression.
Implementing this feature requires significant modification in
the logic of the occur engine: either changing the algorithm to
call `looking-at' at every line (very inefficient), or recording
a position of the previous match and outputing lines between it
and the current position (not easy to customize).
--
Juri Linkov
http://www.jurta.org/emacs/
next prev parent reply other threads:[~2007-12-01 0:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-29 16:02 occur API change proposal Ted Zlatanov
2007-12-01 0:34 ` Juri Linkov [this message]
2008-08-05 18:49 ` add INVERT to re-search-{forward, backward} (was: occur API change proposal) Ted Zlatanov
2008-08-25 15:45 ` Juri Linkov
2008-08-25 15:57 ` add INVERT to re-search-{forward, backward} Lennart Borgman (gmail)
2008-08-25 19:45 ` Juri Linkov
2008-08-25 20:07 ` Lennart Borgman (gmail)
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