/b-gtk/fix-viz : revision 423.2.1

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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 = {}

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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_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):

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

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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

"""

8

9

10

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

11

12

from bzrlib.tsort import merge_sort

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14

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

32

in particular) to draw the node in.

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

35

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

36

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

38

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

39

40

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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if len(graph_parents)>0:

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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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else:

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merge_sorted_revisions = ()

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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):

76

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

84

if branch_id not in branch_lines:

85

branch_line = []

86

branch_lines[branch_id] = branch_line

87

else:

88

branch_line = branch_lines[branch_id]

89

90

branch_line.append(rev_index)

91

92

parents = graph_parents[revid]

93

for parent_revid in parents:

94

graph_children[parent_revid].append(revid)

95

96

linegraph.append([revid,

97

None,

98

[],

99

parents,

100

None,

101

revno_sequence])

102

103

branch_ids = branch_lines.keys()

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105

def branch_id_cmp(x, y):

106

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

107

by their value"""

108

len_x = len(x)

109

len_y = len(y)

110

if len_x == len_y:

111

return -cmp(x, y)

112

return cmp(len_x, len_y)

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114

branch_ids.sort(branch_id_cmp)

115

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

116

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

117

# 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

119

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

120

lines = []

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

122

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

123

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

124

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

125

columns = [list(empty_column)]

126

127

128

for branch_id in branch_ids:

129

branch_line = branch_lines[branch_id]

130

131

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

132

# starting point when looking for a free column.

133

parent_col_index = 0

134

parent_index = None

135

if len(branch_id) > 1:

136

parent_revno = branch_id[0:-1]

137

if parent_revno in revno_index:

138

parent_index = revno_index[parent_revno]

139

parent_node = linegraph[parent_index][1]

140

if parent_node:

141

parent_col_index = parent_node[0]

142

143

144

col_search_order = _branch_line_col_search_order(columns,

145

parent_col_index)

146

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

147

cur_cont_line = []

148

149

line_range = []

150

last_rev_index = None

151

for rev_index in branch_line:

152

if last_rev_index:

153

if broken_line_length and \

154

rev_index - last_rev_index > broken_line_length:

155

line_range.append(last_rev_index+1)

156

line_range.append(rev_index-1)

157

else:

158

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

159

160

line_range.append(rev_index)

161

last_rev_index = rev_index

162

163

if parent_index:

164

if broken_line_length and \

165

parent_index - last_rev_index > broken_line_length:

166

line_range.append(last_rev_index+1)

167

else:

168

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

169

170

col_index = _find_free_column(columns,

171

empty_column,

172

col_search_order,

173

line_range)

174

node = (col_index, color)

175

for rev_index in branch_line:

176

linegraph[rev_index][1] = node

177

columns[col_index][rev_index] = True

178

179

for rev_index in branch_line:

180

(sequence_number,

181

revid,

182

merge_depth,

183

revno_sequence,

184

end_of_merge) = merge_sorted_revisions[rev_index]

185

186

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

187

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

188

189

for parent_revid in graph_parents[revid]:

190

if parent_revid in revid_index:

191

192

parent_index = revid_index[parent_revid]

193

parent_node = linegraph[parent_index][1]

194

if parent_node:

195

parent_col_index = parent_node[0]

196

else:

197

parent_col_index = None

198

col_search_order = \

199

_line_col_search_order(columns,

200

parent_col_index,

201

col_index)

202

203

# If this line is really long, break it.

204

if len(branch_id) > 0 and \

205

broken_line_length and \

206

parent_index - rev_index > broken_line_length:

207

child_line_col_index = \

208

_find_free_column(columns,

209

empty_column,

210

col_search_order,

211

(rev_index + 1,))

212

_mark_column_as_used(columns,

213

child_line_col_index,

214

(rev_index + 1,))

215

216

# Recall _line_col_search_order to reset it back to

217

# the beging.

218

col_search_order = \

219

_line_col_search_order(columns,

220

parent_col_index,

221

col_index)

222

parent_col_line_index = \

223

_find_free_column(columns,

224

empty_column,

225

col_search_order,

226

(parent_index - 1,))

227

_mark_column_as_used(columns,

228

parent_col_line_index,

229

(parent_index - 1,))

230

lines.append((rev_index,

231

parent_index,

232

(child_line_col_index,

233

parent_col_line_index)))

234

else :

235

line_col_index = col_index

236

if parent_index - rev_index >1:

237

line_range = range(rev_index + 1, parent_index)

238

line_col_index = \

239

_find_free_column(columns,

240

empty_column,

241

col_search_order,

242

line_range)

243

_mark_column_as_used(columns,

244

line_col_index,

245

line_range)

246

lines.append((rev_index,

247

parent_index,

248

(line_col_index,)))

249

250

for (child_index, parent_index, line_col_indexes) in lines:

251

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

252

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

253

254

if len(line_col_indexes) == 1:

255

if parent_index - child_index == 1:

256

linegraph[child_index][2].append(

257

(child_col_index,

258

parent_col_index,

259

parent_color))

260

else:

261

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

262

linegraph[child_index][2].append(

263

(child_col_index,

264

line_col_indexes[0],

265

parent_color))

266

# lines down the line's column

267

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

268

linegraph[line_part_index][2].append(

269

(line_col_indexes[0],

270

line_col_indexes[0],

271

parent_color))

272

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

273

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

274

(line_col_indexes[0],

275

parent_col_index,

276

parent_color))

277

else:

278

# Broken line

279

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

280

linegraph[child_index][2].append(

281

(child_col_index,

282

line_col_indexes[0],

283

parent_color))

284

# Broken line end

285

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

286

(line_col_indexes[0],

287

None,

288

parent_color))

289

290

# Broken line end

291

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

292

(None,

293

line_col_indexes[1],

294

parent_color))

295

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

296

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

297

(line_col_indexes[1],

298

parent_col_index,

299

parent_color))

300

301

302

return (linegraph, revid_index, len(columns))

303

304

def _branch_line_col_search_order(columns, parent_col_index):

305

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

306

yield col_index

307

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

308

yield col_index

309

310

def _line_col_search_order(columns, parent_col_index, child_col_index):

311

if parent_col_index is not None:

312

max_index = max(parent_col_index, child_col_index)

313

min_index = min(parent_col_index, child_col_index)

314

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

315

yield col_index

316

else:

317

max_index = child_col_index

318

min_index = child_col_index

319

yield child_col_index

320

i = 1

321

while max_index + i < len(columns) or \

322

min_index - i > -1:

323

if max_index + i < len(columns):

324

yield max_index + i

325

if min_index - i > -1:

326

yield min_index - i

327

i += 1

328

329

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

330

for col_index in col_search_order:

331

column = columns[col_index]

332

has_overlaping_line = False

333

for row_index in line_range:

334

if column[row_index]:

335

has_overlaping_line = True

336

break

337

if not has_overlaping_line:

338

break

339

else:

340

col_index = len(columns)

341

column = list(empty_column)

342

columns.append(column)

343

return col_index

344

345

def _mark_column_as_used(columns, col_index, line_range):

346

column = columns[col_index]

347

for row_index in line_range:

348

column[row_index] = True

349

350

def same_branch(a, b):

351

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

352

if len(a.parent_ids) == 1:

353

# Defacto same branch if only parent

354

return True

355

elif a.committer == b.committer:

356

# Same committer so may as well be

357

return True

358

else:

359

return False