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From: Phil Sainty <psainty@orcon.net.nz>
To: Lars Ingebrigtsen <larsi@gnus.org>
Cc: 45652@debbugs.gnu.org, "積丹尼 Dan Jacobson" <jidanni@jidanni.org>
Subject: bug#45652: so-long mode not triggered despite big file with very long lines
Date: Tue, 12 Jan 2021 15:42:37 +1300	[thread overview]
Message-ID: <9463451af6d023fb4595ffa9182615b6@webmail.orcon.net.nz> (raw)
In-Reply-To: <8735z7chdj.fsf@gnus.org>

On 12/01/21 7:39 am, Lars Ingebrigtsen wrote:
> 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.

FYI, this also triggered a memory from several years ago:
https://lists.gnu.org/archive/html/emacs-devel/2016-07/msg00761.html

Stefan's thought at the time was:
> I wonder if we could improve the detection part with some help from
> the C code.  I'm thinking of trying to keep track of "the last \n
> before point" and calling a hook whenever this is larger than a
> threshold.

I never followed up on that (I ended up shelving the idea of releasing
so-long.el for a couple of years or so, as my own use-cases at the
time turned out to be due to one specific badly-behaved library which
had already been fixed upstream, so for a while I thought it might not
be as useful as I'd originally thought).


On 2021-01-12 10:07, Lars Ingebrigtsen wrote:
>> I can give writing something like that a shot...  It could return, 
>> say,
>> the length of the longest line, and the number of lines?  The median
>> line length would be nice, but would be slower.
> 
> Mean would be easy, and standard deviation would be possible (but
> require two passes, I guess?)

I'm not sure that so-long itself would find it useful to know any kind
of averages, but longest line is obviously useful, and the number of
lines sounds more or less like a freebie, and might be useful too.


-Phil






  reply	other threads:[~2021-01-12  2:42 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-04 11:47 bug#45652: so-long mode not triggered despite big file with very long lines 積丹尼 Dan Jacobson
2021-01-10 14:53 ` Lars Ingebrigtsen
2021-01-11 11:21   ` 積丹尼 Dan Jacobson
2021-01-11 11:28 ` Phil Sainty
2021-01-11 12:55   ` 積丹尼 Dan Jacobson
2021-01-11 19:10     ` Phil Sainty
2021-01-11 23:04       ` 積丹尼 Dan Jacobson
2021-01-12  2:30         ` Phil Sainty
2021-01-12  5:53           ` 積丹尼 Dan Jacobson
2021-01-11 18:39   ` Lars Ingebrigtsen
2021-01-11 19:18     ` Phil Sainty
2021-01-11 19:30       ` Lars Ingebrigtsen
2021-01-11 21:07         ` Lars Ingebrigtsen
2021-01-12  2:42           ` Phil Sainty [this message]
2021-01-12 12:41             ` Lars Ingebrigtsen
2021-01-12 15:28               ` Eli Zaretskii
2021-01-12 15:37                 ` Lars Ingebrigtsen
2021-01-12 15:50                   ` Eli Zaretskii
2021-01-12 17:44                     ` Lars Ingebrigtsen
2021-01-12 19:22             ` Lars Ingebrigtsen
2021-01-12 23:49               ` Phil Sainty
2021-07-30  5:30                 ` Phil Sainty
2021-08-03 11:47                   ` Phil Sainty
2021-01-12  3:25           ` Eli Zaretskii
2021-01-12 12:40             ` Lars Ingebrigtsen

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