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bzrlib/mutabletree.py
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from bzrlib import (
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    add,
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    bzrdir,
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    hooks,
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    )
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from bzrlib.osutils import dirname
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from bzrlib.revisiontree import RevisionTree
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            revprops['author'] = author
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        # args for wt.commit start at message from the Commit.commit method,
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        args = (message, ) + args
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        for hook in MutableTree.hooks['start_commit']:
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            hook(self)
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        committed_id = commit.Commit().commit(working_tree=self,
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            revprops=revprops, *args, **kwargs)
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        return committed_id
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        self.set_parent_trees([(new_revid, rev_tree)])
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class MutableTreeHooks(hooks.Hooks):
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    """A dictionary mapping a hook name to a list of callables for mutabletree 
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    hooks.
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    """
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    def __init__(self):
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        """Create the default hooks.
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        """
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        hooks.Hooks.__init__(self)
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        # Invoked before a commit is done in a tree. New in 1.4
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        self['start_commit'] = []
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# install the default hooks into the MutableTree class.
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MutableTree.hooks = MutableTreeHooks()
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class _FastPath(object):
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    """A path object with fast accessors for things like basename."""
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