/brz/remove-bazaar

"""Display what revisions are missing in 'other' from 'this' and vice versa."""

import bzrlib.ui as ui

def iter_log_data(revisions, revision_source, verbose):

    from bzrlib.diff import compare_trees

    from bzrlib.tree import EmptyTree

    last_tree = EmptyTree

    last_rev_id = None

    for revno, rev_id in revisions:

        rev = revision_source.get_revision(rev_id)

        if verbose:

            remote_tree = revision_source.revision_tree(rev_id)

            parent_rev_id = rev.parent_ids[0]

            if last_rev_id == parent_rev_id:

                parent_tree = last_tree

            else:

                parent_tree = revision_source.revision_tree(parent_rev_id)

            revision_tree = revision_source.revision_tree(rev_id)

            last_rev_id = rev_id

            last_tree = revision_tree

            delta = compare_trees(revision_tree, parent_tree)

        else:

            delta = None

        yield revno, rev, delta

def find_unmerged(local_branch, remote_branch):

    progress = ui.ui_factory.nested_progress_bar()

    local_branch.lock_read()

    try:

        remote_branch.lock_read()

        try:

            local_rev_history, local_rev_history_map = \

                _get_history(local_branch, progress, "local", 0)

            remote_rev_history, remote_rev_history_map = \

                _get_history(remote_branch, progress, "remote", 1)

            result = _shortcut(local_rev_history, remote_rev_history)

            if result is not None:

                local_extra, remote_extra = result

                local_extra = sorted_revisions(local_extra, 

                                               local_rev_history_map)

                remote_extra = sorted_revisions(remote_extra, 

                                                remote_rev_history_map)

                return local_extra, remote_extra

            local_ancestry = _get_ancestry(local_branch.repository, progress, 

                                           "local", 2, local_rev_history)

            remote_ancestry = _get_ancestry(remote_branch.repository, progress,

                                            "remote", 3, remote_rev_history)

            progress.update('pondering', 4, 5)

            extras = local_ancestry.symmetric_difference(remote_ancestry) 

            local_extra = extras.intersection(set(local_rev_history))

            remote_extra = extras.intersection(set(remote_rev_history))

            local_extra = sorted_revisions(local_extra, local_rev_history_map)

            remote_extra = sorted_revisions(remote_extra, 

                                            remote_rev_history_map)

        finally:

            remote_branch.unlock()

    finally:

        local_branch.unlock()

        progress.finished()

    return (local_extra, remote_extra)

def _shortcut(local_rev_history, remote_rev_history):

    local_history = set(local_rev_history)

    remote_history = set(remote_rev_history)

    if len(local_rev_history) == 0:

        return set(), remote_history

    elif len(remote_rev_history) == 0:

        return local_history, set()

    elif local_rev_history[-1] in remote_history:

        return set(), _after(remote_rev_history, local_rev_history)

    elif remote_rev_history[-1] in local_history:

        return _after(local_rev_history, remote_rev_history), set()

    else:

        return None

def _after(larger_history, smaller_history):

    return set(larger_history[larger_history.index(smaller_history[-1])+1:])

def _get_history(branch, progress, label, step):

    progress.update('%s history' % label, step, 5)

    rev_history = branch.revision_history()

    rev_history_map = dict(

        [(rev, rev_history.index(rev) + 1)

         for rev in rev_history])

    return rev_history, rev_history_map

def _get_ancestry(repository, progress, label, step, rev_history):

    progress.update('%s ancestry' % label, step, 5)

    if len(rev_history) > 0:

        ancestry = set(repository.get_ancestry(rev_history[-1]))

    else:

        ancestry = set()

    return ancestry

def sorted_revisions(revisions, history_map):

    revisions = [(history_map[r],r) for r in revisions]

    revisions.sort()

    return revisions