Re: [PATCH 2/5] diff --quiet

From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Mar 15, 2007, 17:43 UTC
Message-ID: <Pine.LNX.4.63.0703151841180.22628@wbgn013.biozentrum.uni-wuerzburg.de>
In-Reply-To: <81b0412b0703150655y3d2a71d3t8db6e334ecf23ca1@mail.gmail.com>

Hi,

On Thu, 15 Mar 2007, Alex Riesen wrote:

Show 10 quoted lines

> On 3/15/07, Johannes Schindelin <Johannes.Schindelin@gmx.de> wrote:
> > > >         $ git-rev-parse v2.6.16^{tree} v2.6.20^{tree}
> > > >
> > >
> > > Why would I want to benchmark --quiet with rev-parse?
> > 
> > It is not benchmarking, but it is a faster solution: you can see if two
> > trees are different by comparing their SHA-1s.
> 
> Can the same be done for index? (index-tree comparison)

Theoretically, yes. Only that Junio did not accept my short-cut ":dir/" notation to mean "take the cache-tree from the index, or if it is dirty, construct it". However, in the latter case, it would not be a speed improvement, but the opposite.

> > (That, however, works only if you do not want something like "git diff
> > -w"...)
> 
> Why? Can't "git diff -w" quit early?

No, but "-w" means "ignore white space", which means that blobs can be deemed equal, even if they differ at the byte-per-byte level.

Ciao, Dscho