GNU bug report logs - #45652
so-long mode not triggered despite big file with very long lines

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Message #22 received at 45652 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Phil Sainty <psainty <at> orcon.net.nz>
Cc: 45652 <at> debbugs.gnu.org,
 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: Re: bug#45652: so-long mode not triggered despite big file with
 very long lines
Date: Mon, 11 Jan 2021 19:39:18 +0100

Phil Sainty <psainty <at> orcon.net.nz> writes:

> In particular, so-long doesn't (by default) look at the whole file,
> and the above file is apparently 45,982 lines long.  For context
> I am currently looking at increasing the maximum number of lines
> checked by so-long (by default) to 500 -- approximately the first
> 1% of your file.

Have you considered adding a C-level primitive that just looks at the
entire buffer?  It should be reasonably simple and very fast -- just
count areas between "\n"s, skipping the buffer gap.  We don't have to
care about characters as such, I think, so this should be massively
faster than counting line lengths in Lisp.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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