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# overhead of this plugin as minimal as possible.
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib.plugins.news_merge.news_merge import news_merger
 
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from bzrlib.plugins.news_merge import news_merge as _mod_news_merge
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""")
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from bzrlib.merge import Merger
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def news_merge_hook(params):
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    """Merger.merge_file_content hook function for bzr-format NEWS files."""
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    # First, check whether this custom merge logic should be used.  We expect
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    # most files should not be merged by this file.
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    if params.winner == 'other':
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        # OTHER is a straight winner, rely on default merge.
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        return 'not_applicable', None
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    elif not params.is_file_merge():
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        # THIS and OTHER aren't both files.
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        return 'not_applicable', None
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    elif not filename_matches_config(params):
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        # The filename isn't listed in the 'news_merge_files' config option.
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        return 'not_applicable', None
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    return news_merger(params)
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def filename_matches_config(params):
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    affected_files = getattr(params, '_news_merge_affected_files', None)
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    if affected_files is None:
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        config = params.merger.this_tree.branch.get_config()
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        # Until bzr provides a better policy for caching the config, we just
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        # add the part we're interested in to the params to avoid reading the
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        # config files repeatedly (bazaar.conf, location.conf, branch.conf).
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        affected_files = config.get_user_option_as_list('news_merge_files')
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        if affected_files is None:
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            # If nothing was specified in the config, we have nothing to do,
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            # but we use None in the params to start the caching.
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            affected_files = []
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        params._news_merge_affected_files = affected_files
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    if affected_files:
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        filename = params.merger.this_tree.id2path(params.file_id)
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        if filename in affected_files:
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            return True
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    return False
 
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def news_merge_hook(merger):
 
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    """Merger.merge_file_content hook for bzr-format NEWS files."""
 
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    return _mod_news_merge.NewsMerger(merger)
 
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def install_hook():
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    Merger.hooks.install_named_hook(