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  • Committer: Canonical.com Patch Queue Manager
  • Date: 2008-05-30 01:02:36 UTC
  • mfrom: (3449.2.8 uncommit_perf)
  • Revision ID: pqm@pqm.ubuntu.com-20080530010236-e3x7ckdc25s57pgc
(jam) Speed up 'bzr uncommit' by avoiding loading the whole revision
        history (bug #172649)

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bzrlib/log.py
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    :return: A (mainline_revs, rev_nos, start_rev_id, end_rev_id) tuple.
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    """
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    which_revs = _enumerate_history(branch)
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    if not which_revs:
 
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    branch_revno, branch_last_revision = branch.last_revision_info()
 
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    if branch_revno == 0:
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        return None, None, None, None
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    # For mainline generation, map start_revision and end_revision to 
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    if start_revision is None:
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        start_revno = 1
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    else:
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        if isinstance(start_revision,RevisionInfo):
 
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        if isinstance(start_revision, RevisionInfo):
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            start_rev_id = start_revision.rev_id
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            start_revno = start_revision.revno or 1
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        else:
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    end_rev_id = None
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    if end_revision is None:
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        end_revno = len(which_revs)
 
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        end_revno = branch_revno
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    else:
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        if isinstance(end_revision,RevisionInfo):
 
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        if isinstance(end_revision, RevisionInfo):
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            end_rev_id = end_revision.rev_id
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            end_revno = end_revision.revno or len(which_revs)
 
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            end_revno = end_revision.revno or branch_revno
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        else:
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            branch.check_real_revno(end_revision)
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            end_revno = end_revision
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        raise BzrCommandError("Start revision must be older than "
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                              "the end revision.")
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    # list indexes are 0-based; revisions are 1-based
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    cut_revs = which_revs[(start_revno-1):(end_revno)]
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    if not cut_revs:
 
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    if end_revno < start_revno:
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        return None, None, None, None
 
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    cur_revno = branch_revno
 
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    rev_nos = {}
 
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    mainline_revs = []
 
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    for revision_id in branch.repository.iter_reverse_revision_history(
 
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                        branch_last_revision):
 
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        if cur_revno < start_revno:
 
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            # We have gone far enough, but we always add 1 more revision
 
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            rev_nos[revision_id] = cur_revno
 
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            mainline_revs.append(revision_id)
 
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            break
 
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        if cur_revno <= end_revno:
 
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            rev_nos[revision_id] = cur_revno
 
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            mainline_revs.append(revision_id)
 
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        cur_revno -= 1
 
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    else:
 
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        # We walked off the edge of all revisions, so we add a 'None' marker
 
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        mainline_revs.append(None)
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    # convert the revision history to a dictionary:
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    rev_nos = dict((k, v) for v, k in cut_revs)
 
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    mainline_revs.reverse()
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    # override the mainline to look like the revision history.
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    mainline_revs = [revision_id for index, revision_id in cut_revs]
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    if cut_revs[0][0] == 1:
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        mainline_revs.insert(0, None)
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    else:
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        mainline_revs.insert(0, which_revs[start_revno-2][1])
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    return mainline_revs, rev_nos, start_rev_id, end_rev_id
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