bug#45652: so-long mode not triggered despite big file with very long lines

[Lars Ingebrigtsen <larsi@gnus.org>]

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

> 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.

The `buffer-line-statistics' function is now on the trunk, and it
returns count/longest/mean, since those three are free-ish.  (I could
also add standard deviation or variance -- it would basically just be a
sqrt and a division per line?)

Testing in a 18MB zip file (which is probably on the outer limits of
what people load into Emacs, size-wise, for editing), it takes 0.002
seconds to compute the data, so for real usage, it should be
unnoticeable.

The data for that file is

(81472 2632 220.35040259229885)

There's a bit more newlines in that zip file than I'd expect?  I mean,
if it was totally random, it should be 255 or something?

Anyway, I digress.

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