/b-gtk/fix-viz : revision 412.1.12

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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.tsort import merge_sort

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class DummyRevision(object):

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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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self.revision_id = revid

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self.parent_ids = []

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self.committer = None

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self.message = self.revision_id

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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, branch, start):

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self.branch = branch

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self.start = start

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self.revisions = {}

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self.children = {}

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self.children_of_id = {start: set()}

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self.parent_ids_of = {}

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self.colours = { start: 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.branch.repository.get_revision_graph_with_ghosts([self.start])

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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.branch.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(branch, start):

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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(branch, start)

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distance.fill_caches()

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

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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

13

14

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

15

"""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.

42

"""

43

44

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

63

# a list of rev_indexes in the branch.

64

branch_lines = {}

65

66

linegraph = []

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68

for (rev_index, (sequence_number,

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revid,

70

merge_depth,

71

revno_sequence,

72

end_of_merge)) in enumerate(merge_sorted_revisions):

73

if maxnum and rev_index >= maxnum:

74

break

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revid_index[revid] = rev_index

76

revno_index[revno_sequence] = rev_index

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78

branch_id = revno_sequence[0:-1]

79

80

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]

86

87

branch_line.append(rev_index)

88

89

parents = graph_parents[revid]

90

for parent_revid in parents:

91

graph_children[parent_revid].append(revid)

92

93

linegraph.append([revid,

94

None,

95

[],

96

parents,

97

None,

98

revno_sequence])

99

100

branch_ids = branch_lines.keys()

101

102

def branch_id_cmp(x, y):

103

"""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)

109

return cmp(len_x, len_y)

110

111

branch_ids.sort(branch_id_cmp)

112

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

113

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

114

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

115

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

116

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

117

lines = []

118

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

121

# 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