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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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"""Merge logic for news_merge plugin."""
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from bzrlib.plugins.news_merge.parser import simple_parse
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from bzrlib import merge3
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magic_marker = '|NEWS-MERGE-MAGIC-MARKER|'
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def news_merger(params):
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"""Perform a simple 3-way merge of a bzr NEWS file.
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Each section of a bzr NEWS file is essentially an ordered set of bullet
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points, so we can simply take a set of bullet points, determine which
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bullets to add and which to remove, sort, and reserialize.
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# Transform the different versions of the NEWS file into a bunch of text
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# lines where each line matches one part of the overall structure, e.g. a
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return list(blocks_to_fakelines(simple_parse(''.join(lines))))
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this_lines = munge(params.this_lines)
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other_lines = munge(params.other_lines)
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base_lines = munge(params.base_lines)
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m3 = merge3.Merge3(base_lines, this_lines, other_lines)
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for group in m3.merge_groups():
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if group[0] == 'conflict':
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# Are all the conflicting lines bullets? If so, we can merge this.
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for line_set in [base, a, b]:
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if not line.startswith('bullet'):
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# Maybe the default merge can cope.
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return 'not_applicable', None
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# Calculate additions and deletions.
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new_in_a = set(a).difference(base)
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new_in_b = set(b).difference(base)
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all_new = new_in_a.union(new_in_b)
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deleted_in_a = set(base).difference(a)
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deleted_in_b = set(base).difference(b)
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# Combine into the final set of bullet points.
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final = all_new.difference(deleted_in_a).difference(deleted_in_b)
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final = sorted(final, key=sort_key)
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result_lines.extend(final)
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result_lines.extend(group[1])
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# Transform the merged elements back into real blocks of lines.
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return 'success', list(fakelines_to_blocks(result_lines))
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def blocks_to_fakelines(blocks):
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for kind, text in blocks:
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yield '%s%s%s' % (kind, magic_marker, text)
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def fakelines_to_blocks(fakelines):
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fakelines = list(fakelines)
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# Strip out the magic_marker, and reinstate the \n\n between blocks
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for fakeline in fakelines[:-1]:
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yield fakeline.split(magic_marker, 1)[1] + '\n\n'
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# The final block doesn't have a trailing \n\n.
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for fakeline in fakelines[-1:]:
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yield fakeline.split(magic_marker, 1)[1]
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return s.replace('`', '').lower()
added
removed
bzrlib/plugins/news_merge/news_merge.py
