[MERGE] Add BzrDirFormat.register_control_format_lazy()

[Robert Collins]

On Thu, 2009-01-29 at 11:19 +1100, Robert Collins wrote:
> On Thu, 2009-01-29 at 00:24 +0100, Jelmer Vernooij wrote:
> > This patch adds a way to register non-bzr control formats lazily. This
> > makes it possible for e.g. bzr-svn to not load half of subversion unless
> > bzr-svn is actually used.
> 
> A question:
>  - does this actually work? Looks to me like the very first 'bzr st' in
> a subdir will load the bzr-svn format object

bb:reject

discussed on IRC - this only saves an import of anything when bzr is
pointed directly at a .bzr directory. Anytime the probe logic doesn't
get a hit immediately it will traverse all the formats anyway: Formats
are lazy objects themselves, they are meant to have just enough code to
bootstrap things.

-Rob
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