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Viewing changes to bzrlib/library_state.py

  • Committer: Andrew Bennetts
  • Date: 2010-10-13 00:26:41 UTC
  • mto: This revision was merged to the branch mainline in revision 5498.
  • Revision ID: andrew.bennetts@canonical.com-20101013002641-9tlh9k89mlj1666m
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bzrlib/library_state.py
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    This is the core state needed to make use of bzr. The current instance is
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    currently always exposed as bzrlib.global_state, but we desired to move
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    to a point where no global state is needed at all.
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    :ivar saved_state: The bzrlib.global_state at the time __enter__ was
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        called.
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    :ivar cleanups: An ObjectWithCleanups which can be used for cleanups that
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        """
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        self._ui = ui
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        self._trace = trace
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        self.started = False
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    def __enter__(self):
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        if not self.started:
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            self._start()
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        return self # This is bound to the 'as' clause in a with statement.
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    def _start(self):
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        """Do all initialization.
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        """        
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        # NB: This function tweaks so much global state it's hard to test it in
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        # isolation within the same interpreter.  It's not reached on normal
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        # in-process run_bzr calls.  If it's broken, we expect that
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        self.saved_state = bzrlib.global_state
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        bzrlib.global_state = self
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        self.started = True
 
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        return self # This is bound to the 'as' clause in a with statement.
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    def __exit__(self, exc_type, exc_val, exc_tb):
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        self.cleanups.cleanup_now()