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New Branch.last_revision_info method, this is being done to allow
optimization of requests for both the number of revisions and the last
revision of a branch with smartservers and potentially future branch
formats. (Wouter van Heyst, Robert Collins)

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bzrlib/branch.py
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        else:
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            return None
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    def last_revision_info(self):
 
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        """Return information about the last revision.
 
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        :return: A tuple (revno, last_revision_id).
 
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        """
 
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        rh = self.revision_history()
 
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        revno = len(rh)
 
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        if revno:
 
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            return (revno, rh[-1])
 
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        else:
 
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            return (0, _mod_revision.NULL_REVISION)
 
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    def missing_revisions(self, other, stop_revision=None):
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        """Return a list of new revisions that would perfectly fit.
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