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# Copyright (C) 2010 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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__doc__ = """Merge hook for GNU-format ChangeLog files
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To enable this plugin, add a section to your location.conf
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changelog_merge_files = ChangeLog
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Or add an entry to your branch.conf like::
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changelog_merge_files = ChangeLog
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The changelog_merge_files config option takes a list of file names (not paths),
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separated by commas. (This is unlike the news_merge plugin, which matches
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paths.) e.g. the above config examples would match both
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``src/foolib/ChangeLog`` and ``docs/ChangeLog``.
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The algorithm used to merge the changes can be summarised as:
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* new entries added to the top of OTHER are emitted first
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* all other additions, deletions and edits from THIS and OTHER are preserved
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* edits (e.g. to fix typos) at the top of OTHER are hard to distinguish from
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adding and deleting independent entries; the algorithm tries to guess which
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based on how similar the old and new entries are.
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Most changes can be merged, but conflicts are possible if the plugin finds
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edits at the top of OTHER to entries that have been deleted (or also edited) by
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THIS. In that case the plugin gives up and bzr's default merge logic will be
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No effort is made to deduplicate entries added by both sides.
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The results depend on the choice of the 'base' version, so it might give
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strange results if there is a criss-cross merge.
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# Since we are a built-in plugin we share the bzrlib version
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from bzrlib import version_info
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# Put most of the code in a separate module that we lazy-import to keep the
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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.changelog_merge import changelog_merge as _mod_changelog_merge
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from bzrlib.merge import Merger
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def changelog_merge_hook(merger):
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"""Merger.merge_file_content hook for GNU-format ChangeLog files."""
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return _mod_changelog_merge.ChangeLogMerger(merger)
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Merger.hooks.install_named_hook(
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'merge_file_content', changelog_merge_hook, 'GNU ChangeLog file merge')
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def load_tests(basic_tests, module, loader):
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basic_tests.addTest(loader.loadTestsFromModuleNames(
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["%s.%s" % (__name__, tmn) for tmn in testmod_names]))
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bzrlib/plugins/changelog_merge/__init__.py
