[merge] LazyFactory

[Aaron Bentley]

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Adeodato Simó wrote:
> I know I want to look into Aaron's optparse branch and move from
> EnumOption for --log-format to an option that gets the possible values
> from a registry. That should solve the "formats registered by plugins
> don't show in help" problem. And ditto for my commit --template option.

I've already said that I'm working on something similar.  Your solution
doesn't seem to address everything that mine does.

Specifically,
 - it doesn't guarantee ordering
 - it doesn't provide help text in a uniform way
 - it ignores per-command defaults

So in its current state, I wouldn't welcome it.

Aaron
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