[RFC] bzr log --log-format help should give the list of log formats

[Aaron Bentley]

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John Arbash Meinel wrote:

> Even better if we read bzrlib.log.FORMATTERS.keys() to fill out that
> list, so that if you install a plugin, registering its format, adds an
> entry to that list.
> 
> I'm not sure if we can do that very easily with the current option code,
> though.

Using the doctext for help is just the default implementation of
Command.help().  You can supply your own help() if you need something
fancy.  See cmd_merge for an example of how I'm doing that.

Aaron
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