(rfc) list of available log formatters

[Alexander Belchenko]

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Today I run into error with my bzr-config utility.
My utility allows to select default log formatter
to store in bazaar.conf.

In bzr-0.14 and earlier there is global variable
FORMATTERS in log.py. And this variable is not private,
so I assume it could be used by any client of bzrlib.

Now it switch to Registry object with new name
log_formatter_registry. And old name FORMATTERS
is gone.

It's not very good situation for bzr-config utility.
There is no deprecation period for FORMATTERS,
and obviously I miss this change.

Only one safe solution I see is to check existence of
'FORMATTERS' or 'log_formatter_registry' name in log.py.
It's possible for me, but somewhat ugly, IMO.

Why not just name this new Registry object with old name?
i.e. log_formatter_registry => FORMATTERS.
Registry object has dict-like interface, at least
I need only .keys() method.

Alexander
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