Re: Following renames

From: Petr Baudis <pasky@suse.cz>
Date: Mar 26, 2006, 10:07 UTC
Message-ID: <20060326100717.GD18185@pasky.or.cz>
In-Reply-To: <44264426.8010608@michonline.com>

Dear diary, on Sun, Mar 26, 2006 at 05:19:50AM CEST, I got a letter where Linus Torvalds <torvalds@osdl.org> said that...

Show 9 quoted lines

> On Sun, 26 Mar 2006, Petr Baudis wrote:
> > 
> >   In [1], Linus suggests a non-core solution. Unfortunately, it doesn't
> > fly - it requires at least two git-ls-tree calls per revision which
> > would bog things down awfully (to roughly half of the original speed).
> 
> No it doesn't. It requires one git-ls-tree WHEN SOMETHING IS RENAMED.
> 
> In other words, basically never.

Huh? I don't see that now (and caps don't help me see it better). That's certainly not what is in [1], and I don't see _how_ to detect the renames in this case, and what would I be actually doing git-ls-tree for when I've already detected the rename. Based on [1], I'd be doing git-ls-tree merely to detect that a file _disappeared_ in the first place, I have to do other stuff to detect the renames themselves.

Dear diary, on Sun, Mar 26, 2006 at 09:35:02AM CEST, I got a letter where Ryan Anderson <ryan@michonline.com> said that...

> A simple example is the first loop in git-annotate.perl.  (Which was
> basically written by Linus, I just translated it from a
> shell/pseudo-code example into Perl)

Thanks for the hint. Unfortunately, this is precisely the thing I want to avoid, that is essentially reimplementing part of git-rev-list - to do something good, I would have to do my own toposort and merge by date between parallel lines. OTOH, I might just construct a large revlist commandline specifying all the segments I'm interested in and see what happens when I run that.

Besides, doing it in shell would be pretty ugly job (forcing me to finally rewrite it in perl is not a bad thing but that'd be a somewhat larger project since I share various common routines with other cg tools, etc).

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
Right now I am having amnesia and deja-vu at the same time.  I think
I have forgotten this before.