API for an extension to register a hook?

[Matt Mackall]

On Thu, 2010-01-07 at 09:32 -0700, Tory Patnoe wrote:
> Is it possible for an extension to register a hook. AFAICT hooks and 
> extensions are separate. There is wrapcommand and wrapfunction but I 
> didn't find a registerhook. In my testing all I ended up doing was 
> calling the hook in setupui etc.

You can add hooks to the config data stored in the ui objects.

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