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

[John Arbash Meinel]

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Matthieu Moy wrote:
> Hi,
> 
> It's quite common in other tools having an option to choose between a
> fixed set of strings to provide the list of possibilities with the
> string "help", like "mplayer -vo help" does for example.
> 
> It would be cool if "bzr log --log-format help" did the same.
> 

I think it makes more sense for:
bzr log --help

To just explain the log formats.

Which it already does, though not in a very clear way. We could try to
make it more clear. Maybe change the help text to:

- --log-format ARG  Set the log format. (can be: line, long, short).

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.

John
=:->
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