Writing a new RevisionSpec

[Gioele Barabucci]

Hello,

I'm trying to write a new RevisionSpec but I cannot understand how to get
certain information from the context _merge_on() is called from.

1) If I call "bzr log -r my_spec foo/bar", how can i get "foo/bar" from
_merge_on()?
2) How can I tell bzr that my RevisionSpec works only when no file or a
single file is specified?
3) What is the purpose of the second _merge_on parameter "revs"?
4) Where does the name _merge_on() come from?

http://starship.python.net/crew/mwh/bzrlibapi/ is the API documentation that
I used, are there others?

Bye,

-- 
Gioele <dev at gioelebarabucci.com>