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Re: Automatic (e)tags generation and incremental updates

From: Eli Zaretskii
Subject: Re: Automatic (e)tags generation and incremental updates
Date: Tue, 12 Jan 2021 17:08:23 +0200

> Cc: tom@tromey.com, john@yates-sheets.org, philipk@posteo.net,
>  emacs-devel@gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Tue, 12 Jan 2021 03:33:10 +0200
> >>     (write-region (point-min) (point-max) buffer-file-name nil 'silent)
> >>
> >> I wonder if *that* could be done asynchronously.
> > 
> > What kind of asynchronicity did you have in mind?
> One where the Lisp code doesn't have to wait for the disk write to 
> complete.

Wed don't have such facilities, because they would need locking the
region (actually, probably the entire buffer) for changes while it

> > And I'm probbaly missing something, because I don't understand how
> > Emacs is involved in updating the tags table.
> It's part of the secret sauce for the quick incremental updates: if 
> etags writes to disk, even just to update one file's index, we'll have 
> to revert-buffer, and the bigger the tags file is, the longer the revert 
> will take. Basically, N(project-size).

But still faster than write-region, no?  Did you try it the other way
around: let etags write to a file, and then revert, or even just
replace some region that you wanted updated (with

Anyway, TAGS and etags.el were designed to be very tolerant to
changes, so you shouldn't need to update very often.

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