/b-gtk/fix-viz : revision 411.1.2

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# -*- coding: UTF-8 -*-

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"""Directed graph production.

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This module contains the code to produce an ordered directed graph of a

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bzr branch, such as we display in the tree view at the top of the bzrk

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window.

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"""

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__author__ = "Scott James Remnant <scott@ubuntu.com>"

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from bzrlib.revision import Revision

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from bzrlib.tsort import merge_sort

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class DummyRevision(Revision):

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"""Dummy bzr revision.

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Sometimes, especially in older bzr branches, a revision is referenced

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as the parent of another but not actually present in the branch's store.

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When this happens we use an instance of this class instead of the real

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Revision object (which we can't get).

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"""

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def __init__(self, revid):

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super(DummyRevision, self).__init__(revid)

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self.committer = None

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self.timestamp = None

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self.timezone = None

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self.message = revid

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class RevisionProxy(object):

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"""A revision proxy object.

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This will demand load the revision it represents when the committer or

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message attributes are accessed in order to populate them. It is

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constructed with the revision id and parent_ids list and a repository

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object to request the revision from when needed.

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"""

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def __init__(self, revid, parent_ids, repository):

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self.revision_id = revid

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self.parent_ids = parent_ids

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self._repository = repository

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self._revision = None

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def _get_attribute_getter(attr):

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def get_attribute(self):

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if self._revision is None:

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self._load()

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return getattr(self._revision, attr)

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return get_attribute

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committer = property(_get_attribute_getter('committer'))

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message = property(_get_attribute_getter('message'))

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properties = property(_get_attribute_getter('properties'))

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timestamp = property(_get_attribute_getter('timestamp'))

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timezone = property(_get_attribute_getter('timezone'))

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def _load(self):

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"""Load the revision object."""

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self._revision = self._repository.get_revision(self.revision_id)

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class DistanceMethod(object):

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def __init__(self, repository, start_revid):

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self.repository = repository

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self.start_revid = start_revid

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self.revisions = {}

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self.children_of_id = {start_revid: set()}

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self.parent_ids_of = {}

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self.colours = { start_revid: 0 }

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self.last_colour = 0

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self.direct_parent_of = {}

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self.graph = {}

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def fill_caches(self):

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graph = self.repository.get_revision_graph_with_ghosts([self.start_revid])

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for revid in graph.ghosts:

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self.cache_revision(DummyRevision(revid))

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for revid, parents in graph.get_ancestors().items():

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self.cache_revision(RevisionProxy(revid, parents, self.repository))

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def cache_revision(self, revision):

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"Set the caches for a newly retrieved revision."""

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revid = revision.revision_id

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# Build a revision cache

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self.revisions[revid] = revision

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# Build a children dictionary

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for parent_id in revision.parent_ids:

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self.children_of_id.setdefault(parent_id, set()).add(revision)

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# Build a parents dictionnary, where redundant parents will be removed,

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# and that will be passed along tothe rest of program.

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if len(revision.parent_ids) != len(set(revision.parent_ids)):

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# fix the parent_ids list.

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parent_ids = []

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parent_ids_set = set()

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for parent_id in revision.parent_ids:

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if parent_id in parent_ids_set:

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continue

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parent_ids.append(parent_id)

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parent_ids_set.add(parent_id)

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revision.parent_ids = parent_ids

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self.parent_ids_of[revision] = list(revision.parent_ids)

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self.graph[revid] = revision.parent_ids

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def make_children_map(self):

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revisions = self.revisions

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return dict((revisions[revid], c)

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for (revid, c) in self.children_of_id.iteritems())

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def sort_revisions(self, sorted_revids, maxnum):

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revisions = self.revisions

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parent_ids_of = self.parent_ids_of

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children_of_id = self.children_of_id

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# Try to compact sequences of revisions on the same branch.

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distances = {}

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skipped_revids = []

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expected_id = sorted_revids[0]

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pending_ids = []

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while True:

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revid = sorted_revids.pop(0)

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if revid != expected_id:

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skipped_revids.append(revid)

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continue

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revision = revisions[revid]

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for child in children_of_id[revid]:

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# postpone if any child is missing

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if child.revision_id not in distances:

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if expected_id not in pending_ids:

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pending_ids.append(expected_id)

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expected_id = pending_ids.pop(0)

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skipped_revids.append(revid)

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sorted_revids[:0] = skipped_revids

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del skipped_revids[:]

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break

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else:

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# all children are here, push!

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distances[revid] = len(distances)

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if maxnum is not None and len(distances) > maxnum:

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# bail out early if a limit was specified

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sorted_revids[:0] = skipped_revids

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for revid in sorted_revids:

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distances[revid] = len(distances)

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break

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# all parents will need to be pushed as soon as possible

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for parent in parent_ids_of[revision]:

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if parent not in pending_ids:

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pending_ids.insert(0, parent)

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if not pending_ids:

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break

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expected_id = pending_ids.pop(0)

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# if the next expected revid has already been skipped, requeue

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# the skipped ids, except those that would go right back to the

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# skipped list.

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if expected_id in skipped_revids:

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pos = skipped_revids.index(expected_id)

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sorted_revids[:0] = skipped_revids[pos:]

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del skipped_revids[pos:]

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self.distances = distances

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return sorted(distances, key=distances.get)

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def choose_null_colour(self, revid):

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"""We know we don't need this color, so just set it to NULL"""

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self.colours[revid] = 0

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def choose_colour(self, revid):

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revision = self.revisions[revid]

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children_of_id = self.children_of_id

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parent_ids_of = self.parent_ids_of

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colours = self.colours

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# choose colour

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the_children = children_of_id[revid]

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if len(the_children) == 1:

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[child] = the_children

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if len(parent_ids_of[child]) == 1:

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# one-one relationship between parent and child, same

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# colour

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colours[revid] = colours[child.revision_id]

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else:

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self.choose_colour_one_child(revision, child)

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else:

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self.choose_colour_many_children(revision, the_children)

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def choose_colour_one_child(self, revision, child):

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revid = revision.revision_id

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direct_parent_of = self.direct_parent_of

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revisions = self.revisions

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# one child with multiple parents, the first parent with

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# the same committer gets the colour

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direct_parent = direct_parent_of.get(child)

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if direct_parent is None:

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# if it has not been found yet, find it now and remember

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for parent_id in self.parent_ids_of[child]:

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parent_revision = revisions[parent_id]

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if parent_revision.committer == child.committer:

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# found the first parent with the same committer

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direct_parent = parent_revision

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direct_parent_of[child] = direct_parent

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break

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if direct_parent == revision:

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self.colours[revid] = self.colours[child.revision_id]

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else:

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self.colours[revid] = self.last_colour = self.last_colour + 1

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def choose_colour_many_children(self, revision, the_children):

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"""Colour revision revision."""

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revid = revision.revision_id

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direct_parent_of = self.direct_parent_of

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# multiple children, get the colour of the last displayed child

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# with the same committer which does not already have its colour

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# taken

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available = {}

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for child in the_children:

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if child.committer != revision.committer:

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continue

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direct_parent = direct_parent_of.get(child)

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if direct_parent == revision:

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self.colours[revid] = self.colours[child.revision_id]

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break

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# FIXME: Colouring based on whats been displayed MUST be done with

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# knowledge of the revisions being output.

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# until the refactoring to fold graph() into this more compactly is

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# done, I've disabled this reuse. RBC 20060403

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# if direct_parent is None:

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# available[child] = distances[child.revision_id]

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# .. it will be something like available[child] = \

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# revs[child.revision_id][0] - which is the sequence number

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else:

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if available:

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sorted_children = sorted(available, key=available.get)

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child = sorted_children[-1]

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direct_parent_of[child] = revision

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self.colours[revid] = self.colours[child.revision_id]

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else:

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# no candidate children is available, pick the next

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# colour

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self.colours[revid] = self.last_colour = self.last_colour + 1

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def distances(repository, start_revid, maxnum=None):

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"""Sort the revisions.

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Traverses the branch revision tree starting at start and produces an

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ordered list of revisions such that a revision always comes after

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any revision it is the parent of.

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Returns a tuple of (revids, revisions, colours, children)

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"""

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distance = DistanceMethod(repository, start_revid)

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distance.fill_caches()

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distance.merge_sorted = merge_sort(distance.graph, distance.start_revid)

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children = distance.make_children_map()

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count = 0

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for seq, revid, merge_depth, end_of_merge in distance.merge_sorted:

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count += 1

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if maxnum is not None and count > maxnum:

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distance.choose_null_colour(revid)

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else:

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distance.choose_colour(revid)

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revisions = distance.revisions

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colours = distance.colours

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parent_ids_of = distance.parent_ids_of

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return (revisions, colours, children, parent_ids_of, distance.merge_sorted)

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def graph(revisions, colours, merge_sorted):

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"""Produce a directed graph of a bzr branch.

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For each revision it then yields a tuple of (revision, node, lines).

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If the revision is only referenced in the branch and not present in the

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store, revision will be a DummyRevision object, otherwise it is the bzr

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Revision object with the meta-data for the revision.

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Node is a tuple of (column, colour) with column being a zero-indexed

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column number of the graph that this revision represents and colour

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being a zero-indexed colour (which doesn't specify any actual colour

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in particular) to draw the node in.

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Lines is a list of tuples which represent lines you should draw away

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from the revision, if you also need to draw lines into the revision

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you should use the lines list from the previous iteration. Each

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typle in the list is in the form (start, end, colour) with start and

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end being zero-indexed column numbers and colour as in node.

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It's up to you how to actually draw the nodes and lines (straight,

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curved, kinked, etc.) and to pick the actual colours for each index.

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"""

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if not len(merge_sorted):

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return

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# split merge_sorted into a map:

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revs = {}

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# FIXME: get a hint on this from the merge_sorted data rather than

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# calculating it ourselves

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# mapping from rev_id to the sequence number of the next lowest rev

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next_lower_rev = {}

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# mapping from rev_id to next-in-branch-revid - may be None for end

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# of branch

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next_branch_revid = {}

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# the stack we are in in the sorted data for determining which

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# next_lower_rev to set. It is a stack which has one list at each

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# depth - the ids at that depth that need the same id allocated.

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current_stack = [[]]

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for seq, revid, indent, end_merge in merge_sorted:

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revs[revid] = (seq, indent, end_merge)

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if indent == len(current_stack):

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# new merge group starts

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current_stack.append([revid])

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elif indent == len(current_stack) - 1:

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# part of the current merge group

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current_stack[-1].append(revid)

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else:

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# end of a merge group

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while current_stack[-1]:

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stack_rev_id = current_stack[-1].pop()

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# record the next lower rev for this rev:

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next_lower_rev[stack_rev_id] = seq

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# if this followed a non-end-merge rev in this group note that

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if len(current_stack[-1]):

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if not revs[current_stack[-1][-1]][2]:

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next_branch_revid[current_stack[-1][-1]] = stack_rev_id

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current_stack.pop()

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# append to the now-current merge group

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current_stack[-1].append(revid)

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# assign a value to all the depth 0 revisions

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while current_stack[-1]:

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stack_rev_id = current_stack[-1].pop()

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# record the next lower rev for this rev:

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next_lower_rev[stack_rev_id] = len(merge_sorted)

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# if this followed a non-end-merge rev in this group note that

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if len(current_stack[-1]):

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if not revs[current_stack[-1][-1]][2]:

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next_branch_revid[current_stack[-1][-1]] = stack_rev_id

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# a list of the current revisions we are drawing lines TO indicating

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# the sequence of their lines on the screen.

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# i.e. [A, B, C] means that the line to A, to B, and to C are in

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# (respectively), 0, 1, 2 on the screen.

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hanging = [merge_sorted[0][1]]

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for seq, revid, indent, end_merge in merge_sorted:

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# a list of the lines to draw: their position in the

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# previous row, their position in this row, and the colour

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# (which is the colour they are routing to).

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lines = []

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new_hanging = []

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for h_idx, hang in enumerate(hanging):

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# one of these will be the current lines node:

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# we are drawing a line. h_idx

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if hang == revid:

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# we have found the current lines node

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node = (h_idx, colours[revid])

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# note that we might have done the main parent

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drawn_parents = set()

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def draw_line(from_idx, to_idx, revision_id):

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try:

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n_idx = new_hanging.index(revision_id)

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except ValueError:

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# force this to be vertical at the place this rev was

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# drawn.

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new_hanging.insert(to_idx, revision_id)

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n_idx = to_idx

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lines.append((from_idx, n_idx, colours[revision_id]))

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# we want to draw a line to the next commit on 'this' branch

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if not end_merge:

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# drop this line first.

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parent_id = next_branch_revid[revid]

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draw_line(h_idx, h_idx, parent_id)

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# we have drawn this parent

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drawn_parents.add(parent_id)

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else:

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# this is the last revision in a 'merge', show where it came from

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if len(revisions[revid].parent_ids) > 1:

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# having > 1

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# parents means this commit was a merge, and being

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# the end point of a merge group means that all

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# the parent revisions were merged into branches

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# to the left of this before this was committed

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# - so we want to show this as a new branch from

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# those revisions.

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# to do this, we show the parent with the lowest

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# sequence number, which is the one that this

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# branch 'spawned from', and no others.

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# If this sounds like a problem, remember that:

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# if the parent was not already in our mainline

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# it would show up as a merge into this making

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# this not the end of a merge-line.

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lowest = len(merge_sorted)

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for parent_id in revisions[revid].parent_ids:

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if revs[parent_id][0] < lowest:

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lowest = revs[parent_id][0]

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assert lowest != len(merge_sorted)

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draw_line(h_idx, len(new_hanging), merge_sorted[lowest][1])

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drawn_parents.add(merge_sorted[lowest][1])

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elif len(revisions[revid].parent_ids) == 1:

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# only one parent, must show this link to be useful.

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parent_id = revisions[revid].parent_ids[0]

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draw_line(h_idx, len(new_hanging), parent_id)

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drawn_parents.add(parent_id)

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# what do we want to draw lines to from here:

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# each parent IF its relevant.

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#

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# Now we need to hang its parents, we put them at the point

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# the old column was so anything to the right of this has

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# to move outwards to make room. We also try and collapse

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# hangs to keep the graph small.

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# RBC: we do not draw lines to parents that were already merged

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# unless its the last revision in a merge group.

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for parent_id in revisions[revid].parent_ids:

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if parent_id in drawn_parents:

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continue

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parent_seq = revs[parent_id][0]

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parent_depth = revs[parent_id][1]

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if parent_depth == indent + 1:

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# The parent was a merge into this branch determine if

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# it was already merged into the mainline via a

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# different merge: if all revisions between us and

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# parent_seq have a indent greater than there are no

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# revisions with a lower indent than us.

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# We do not use 'parent_depth < indent' because that

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# would allow un-uniqueified merges to show up, and

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# merge_sorted should take care of that for us (but

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# does not trim the values)

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if parent_seq < next_lower_rev[revid]:

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draw_line(h_idx, len(new_hanging), parent_id)

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elif parent_depth == indent and parent_seq == seq + 1:

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# part of this branch

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draw_line(h_idx, len(new_hanging), parent_id)

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else:

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# draw a line from the previous position of this line to the

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# new position.

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# h_idx is the old position.

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# new_indent is the new position.

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draw_line(h_idx, len(new_hanging), hang)

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# we've calculated the row, assign new_hanging to hanging to setup for

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# the next row

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hanging = new_hanging

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yield (revisions[revid], node, lines)

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def same_branch(a, b):

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"""Return whether we think revisions a and b are on the same branch."""

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if len(a.parent_ids) == 1:

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# Defacto same branch if only parent

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return True

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elif a.committer == b.committer:

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# Same committer so may as well be

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return True

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else:

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return False

1

# -*- coding: UTF-8 -*-

2

"""Directed graph production.

3

4

This module contains the code to produce an ordered directed graph of a

5

bzr branch, such as we display in the tree view at the top of the bzrk

6

window.

7

"""

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9

10

__author__ = "Scott James Remnant <scott@ubuntu.com>"

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from bzrlib.tsort import merge_sort

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def linegraph(repository, start, maxnum, broken_line_length=None):

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"""Produce a directed graph of a bzr repository.

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Returns a tuple of (line_graph, revid_index, columns_len) where

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* line_graph is a list of tuples of (revid,

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node,

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lines,

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parents,

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children,

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revno_sequence),

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* revid_index is a dict of each revision with the key being the revid, and

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the value the row index, and

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* columns_len is the number of columns need to draw the line graph.

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Node is a tuple of (column, colour) with column being a zero-indexed

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column number of the graph that this revision represents and colour

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being a zero-indexed colour (which doesn't specify any actual colour

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in particular) to draw the node in.

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Lines is a list of tuples which represent lines you should draw away

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from the revision, if you also need to draw lines into the revision

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you should use the lines list from the previous iteration. Each

37

typle in the list is in the form (start, end, colour) with start and

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end being zero-indexed column numbers and colour as in node.

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It's up to you how to actually draw the nodes and lines (straight,

41

curved, kinked, etc.) and to pick the actual colours for each index.

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"""

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graph_parents = repository.get_revision_graph(start)

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graph_children = {}

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for revid in graph_parents.iterkeys():

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graph_children[revid] = []

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merge_sorted_revisions = merge_sort(

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graph_parents,

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start,

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generate_revno=True)

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revid_index = {}

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revno_index = {}

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# This will hold an item for each "branch". For a revisions, the revsion

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# number less the least significant digit is the branch_id, and used as the

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# key for the dict. Hence revision with the same revsion number less the

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# least significant digit are considered to be in the same branch line.

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# e.g.: for revisions 290.12.1 and 290.12.2, the branch_id would be 290.12,

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# and these two revisions will be in the same branch line. Each value is

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# a list of rev_indexes in the branch.

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branch_lines = {}

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linegraph = []

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for (rev_index, (sequence_number,

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revid,

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merge_depth,

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revno_sequence,

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end_of_merge)) in enumerate(merge_sorted_revisions):

73

if maxnum and rev_index >= maxnum:

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break

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revid_index[revid] = rev_index

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revno_index[revno_sequence] = rev_index

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branch_id = revno_sequence[0:-1]

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branch_line = None

81

if branch_id not in branch_lines:

82

branch_line = []

83

branch_lines[branch_id] = branch_line

84

else:

85

branch_line = branch_lines[branch_id]

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branch_line.append(rev_index)

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parents = graph_parents[revid]

90

for parent_revid in parents:

91

graph_children[parent_revid].append(revid)

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linegraph.append([revid,

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None,

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[],

96

parents,

97

None,

98

revno_sequence])

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branch_ids = branch_lines.keys()

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def branch_id_cmp(x, y):

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"""Compaire branch_id's first by the number of digits, then reversed

104

by their value"""

105

len_x = len(x)

106

len_y = len(y)

107

if len_x == len_y:

108

return -cmp(x, y)

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return cmp(len_x, len_y)

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branch_ids.sort(branch_id_cmp)

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# This will hold a tuple of (child_index, parent_index, col_index) for each

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# line that needs to be drawn. If col_index is not none, then the line is

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# drawn along that column, else the the line can be drawn directly between

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# the child and parent because either the child and parent are in the same

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# branch line, or the child and parent are 1 row apart.

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lines = []

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empty_column = [False for i in range(len(graph_parents))]

119

# This will hold a bit map for each cell. If the cell is true, then the

120

# cell allready contains a node or line. This use when deciding what column

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# to place a branch line or line in, without it overlaping something else.

122

columns = [list(empty_column)]

123

124

125

for branch_id in branch_ids:

126

branch_line = branch_lines[branch_id]

127

128

# Find the col_index for the direct parent branch. This will be the

129

# starting point when looking for a free column.

130

parent_col_index = 0

131

parent_index = None

132

if len(branch_id) > 1:

133

parent_revno = branch_id[0:-1]

134

if parent_revno in revno_index:

135

parent_index = revno_index[parent_revno]

136

parent_node = linegraph[parent_index][1]

137

if parent_node:

138

parent_col_index = parent_node[0]

139

140

141

col_search_order = _branch_line_col_search_order(columns,

142

parent_col_index)

143

color = reduce(lambda x, y: x+y, branch_id, 0)

144

cur_cont_line = []

145

146

line_range = []

147

last_rev_index = None

148

for rev_index in branch_line:

149

if last_rev_index:

150

if broken_line_length and \

151

rev_index - last_rev_index > broken_line_length:

152

line_range.append(last_rev_index+1)

153

line_range.append(rev_index-1)

154

else:

155

line_range.extend(range(last_rev_index+1, rev_index))

156

157

line_range.append(rev_index)

158

last_rev_index = rev_index

159

160

if parent_index:

161

if broken_line_length and \

162

parent_index - last_rev_index > broken_line_length:

163

line_range.append(last_rev_index+1)

164

else:

165

line_range.extend(range(last_rev_index+1, parent_index))

166

167

col_index = _find_free_column(columns,

168

empty_column,

169

col_search_order,

170

line_range)

171

node = (col_index, color)

172

for rev_index in branch_line:

173

linegraph[rev_index][1] = node

174

columns[col_index][rev_index] = True

175

176

for rev_index in branch_line:

177

(sequence_number,

178

revid,

179

merge_depth,

180

revno_sequence,

181

end_of_merge) = merge_sorted_revisions[rev_index]

182

183

linegraph[rev_index][4] = graph_children[revid]

184

col_index = linegraph[rev_index][1][0]

185

186

for parent_revid in graph_parents[revid]:

187

if parent_revid in revid_index:

188

189

parent_index = revid_index[parent_revid]

190

parent_node = linegraph[parent_index][1]

191

if parent_node:

192

parent_col_index = parent_node[0]

193

else:

194

parent_col_index = None

195

col_search_order = \

196

_line_col_search_order(columns,

197

parent_col_index,

198

col_index)

199

200

# If this line is really long, break it.

201

if len(branch_id) > 0 and \

202

broken_line_length and \

203

parent_index - rev_index > broken_line_length:

204

child_line_col_index = \

205

_find_free_column(columns,

206

empty_column,

207

col_search_order,

208

(rev_index + 1,))

209

_mark_column_as_used(columns,

210

child_line_col_index,

211

(rev_index + 1,))

212

213

# Recall _line_col_search_order to reset it back to

214

# the beging.

215

col_search_order = \

216

_line_col_search_order(columns,

217

parent_col_index,

218

col_index)

219

parent_col_line_index = \

220

_find_free_column(columns,

221

empty_column,

222

col_search_order,

223

(parent_index - 1,))

224

_mark_column_as_used(columns,

225

parent_col_line_index,

226

(parent_index - 1,))

227

lines.append((rev_index,

228

parent_index,

229

(child_line_col_index,

230

parent_col_line_index)))

231

else :

232

line_col_index = col_index

233

if parent_index - rev_index >1:

234

line_range = range(rev_index + 1, parent_index)

235

line_col_index = \

236

_find_free_column(columns,

237

empty_column,

238

col_search_order,

239

line_range)

240

_mark_column_as_used(columns,

241

line_col_index,

242

line_range)

243

lines.append((rev_index,

244

parent_index,

245

(line_col_index,)))

246

247

for (child_index, parent_index, line_col_indexes) in lines:

248

(child_col_index, child_color) = linegraph[child_index][1]

249

(parent_col_index, parent_color) = linegraph[parent_index][1]

250

251

if len(line_col_indexes) == 1:

252

if parent_index - child_index == 1:

253

linegraph[child_index][2].append(

254

(child_col_index,

255

parent_col_index,

256

parent_color))

257

else:

258

# line from the child's column to the lines column

259

linegraph[child_index][2].append(

260

(child_col_index,

261

line_col_indexes[0],

262

parent_color))

263

# lines down the line's column

264

for line_part_index in range(child_index+1, parent_index-1):

265

linegraph[line_part_index][2].append(

266

(line_col_indexes[0],

267

line_col_indexes[0],

268

parent_color))

269

# line from the line's column to the parent's column

270

linegraph[parent_index-1][2].append(

271

(line_col_indexes[0],

272

parent_col_index,

273

parent_color))

274

else:

275

# Broken line

276

# line from the child's column to the lines column

277

linegraph[child_index][2].append(

278

(child_col_index,

279

line_col_indexes[0],

280

parent_color))

281

# Broken line end

282

linegraph[child_index+1][2].append(

283

(line_col_indexes[0],

284

None,

285

parent_color))

286

287

# Broken line end

288

linegraph[parent_index-2][2].append(

289

(None,

290

line_col_indexes[1],

291

parent_color))

292

# line from the line's column to the parent's column

293

linegraph[parent_index-1][2].append(

294

(line_col_indexes[1],

295

parent_col_index,

296

parent_color))

297

298

299

return (linegraph, revid_index, len(columns))

300

301

def _branch_line_col_search_order(columns, parent_col_index):

302

for col_index in range(parent_col_index, len(columns)):

303

yield col_index

304

for col_index in range(parent_col_index-1, -1, -1):

305

yield col_index

306

307

def _line_col_search_order(columns, parent_col_index, child_col_index):

308

if parent_col_index is not None:

309

max_index = max(parent_col_index, child_col_index)

310

min_index = min(parent_col_index, child_col_index)

311

for col_index in range(max_index, min_index -1, -1):

312

yield col_index

313

else:

314

max_index = child_col_index

315

min_index = child_col_index

316

yield child_col_index

317

i = 1

318

while max_index + i < len(columns) or \

319

min_index - i > -1:

320

if max_index + i < len(columns):

321

yield max_index + i

322

if min_index - i > -1:

323

yield min_index - i

324

i += 1

325

326

def _find_free_column(columns, empty_column, col_search_order, line_range):

327

for col_index in col_search_order:

328

column = columns[col_index]

329

has_overlaping_line = False

330

for row_index in line_range:

331

if column[row_index]:

332

has_overlaping_line = True

333

break

334

if not has_overlaping_line:

335

break

336

else:

337

col_index = len(columns)

338

column = list(empty_column)

339

columns.append(column)

340

return col_index

341

342

def _mark_column_as_used(columns, col_index, line_range):

343

column = columns[col_index]

344

for row_index in line_range:

345

column[row_index] = True

346

347

def same_branch(a, b):

348

"""Return whether we think revisions a and b are on the same branch."""

349

if len(a.parent_ids) == 1:

350

# Defacto same branch if only parent

351

return True

352

elif a.committer == b.committer:

353

# Same committer so may as well be

354

return True

355

else:

356

return False