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Viewing changes to bzrlib/revision.py

  • Committer: Martin Pool
  • Date: 2005-09-01 11:27:20 UTC
  • Revision ID: mbp@sourcefrog.net-20050901112720-f5ccb6b6627991de
- work properly when $EDITOR contains multiple words

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bzrlib/revision.py
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            except bzrlib.errors.NoSuchRevision, e:
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                pass
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        raise e
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def get_intervening_revisions(ancestor_id, rev_id, rev_source, 
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                              revision_history=None):
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    """Find the longest line of descent from maybe_ancestor to revision.
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    Revision history is followed where possible.
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    If ancestor_id == rev_id, list will be empty.
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    Otherwise, rev_id will be the last entry.  ancestor_id will never appear.
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    If ancestor_id is not an ancestor, NotAncestor will be thrown
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    """
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    [rev_source.get_revision(r) for r in (ancestor_id, rev_id)]
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    if ancestor_id == rev_id:
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        return []
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    def historical_lines(line):
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        """Return a tuple of historical/non_historical lines, for sorting.
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        The non_historical count is negative, since non_historical lines are
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        a bad thing.
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        """
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        good_count = 0
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        bad_count = 0
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        for revision in line:
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            if revision in revision_history:
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                good_count += 1
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            else:
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                bad_count -= 1
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        return good_count, bad_count
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    active = [[rev_id]]
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    successful_lines = []
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    while len(active) > 0:
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        new_active = []
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        for line in active:
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            parent_ids = [p.revision_id for p in 
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                          rev_source.get_revision(line[-1]).parents]
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            for parent in parent_ids:
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                line_copy = line[:]
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                if parent == ancestor_id:
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                    successful_lines.append(line_copy)
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                else:
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                    line_copy.append(parent)
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                    new_active.append(line_copy)
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        active = new_active
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    if len(successful_lines) == 0:
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        raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
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    for line in successful_lines:
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        line.reverse()
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    if revision_history is not None:
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        by_historical_lines = []
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        for line in successful_lines:
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            count = historical_lines(line)
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            by_historical_lines.append((count, line))
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        by_historical_lines.sort()
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        if by_historical_lines[-1][0][0] > 0:
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            return by_historical_lines[-1][1]
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    assert len(successful_lines)
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    successful_lines.sort(cmp, len)
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    return successful_lines[-1]