Lazily registering hooks?

[Jelmer Vernooij]

IIRC there was some discussion about this at the recent sprint during
UDS, but I wasn't there for it. 

One of the slowdowns for me in starting up Bazaar is importing the
various modules that the plugins I have installed install hooks in. E.g.
bzr-svn has to load bzrlib.info, bzrlib.diff, bzrlib.send,
bzrlib.filters, bzrlib.version_info_formats.format_rio. 

It'd be great if there was some way to lazily register hooks. I don't
have any good ideas on how to fix that without giving up some of the
benfits that our current infrastructure has (I don't want to centralize
all hooks in a single file). Does anybody else have ideas?

Cheers,

Jelmer
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