1
"""Directed graph production.
3
This module contains the code to produce an ordered directed graph of a
4
bzr branch, such as we display in the tree view at the top of the bzrk
8
__copyright__ = "Copyright 2005 Canonical Ltd."
9
__author__ = "Scott James Remnant <scott@ubuntu.com>"
11
from bzrlib.revision import NULL_REVISION
12
from bzrlib.tsort import merge_sort
16
def linegraph(graph, start_revs, maxnum=None, broken_line_length=None,
17
graph_data=True, mainline_only=False, root_progress=None):
18
"""Produce a directed graph of a bzr repository.
20
Returns a tuple of (line_graph, revid_index, columns_len) where
21
* line_graph is a list of tuples of (revid,
27
* revid_index is a dict of each revision with the key being the revid, and
28
the value the row index, and
29
* columns_len is the number of columns need to draw the line graph.
32
Node is a tuple of (column, colour) with column being a zero-indexed
33
column number of the graph that this revision represents and colour
34
being a zero-indexed colour (which doesn't specify any actual colour
35
in particular) to draw the node in.
37
Lines is a list of tuples which represent lines you should draw away
38
from the revision, if you also need to draw lines into the revision
39
you should use the lines list from the previous iteration. Each
40
typle in the list is in the form (start, end, colour) with start and
41
end being zero-indexed column numbers and colour as in node.
43
It's up to you how to actually draw the nodes and lines (straight,
44
curved, kinked, etc.) and to pick the actual colours for each index.
46
assert isinstance(start_revs, list)
47
def update_root_progress(step_number):
48
"""IFF our container received a root progress bar, then update it."""
49
if root_progress is not None:
50
root_progress.update(None, step_number)
55
update_root_progress(1)
56
progress_bar = ui.ui_factory.nested_progress_bar()
58
progress_bar.update("Arranging tree fragments")
59
for i, (revid, parent_revids) in enumerate(graph.iter_ancestry(start_revs)):
62
if parent_revids is None:
65
if parent_revids == (NULL_REVISION,):
66
graph_parents[revid] = ()
68
graph_parents[revid] = parent_revids
69
for parent in parent_revids:
70
graph_children.setdefault(parent, []).append(revid)
71
graph_children.setdefault(revid, [])
73
progress_bar.finished()
75
update_root_progress(2)
76
progress_bar = ui.ui_factory.nested_progress_bar()
78
progress_bar.update("Removing ghosts", 0, len(ghosts))
79
for i, ghost in enumerate(ghosts):
81
progress_bar.update(None, i)
82
for ghost_child in graph_children[ghost]:
83
graph_parents[ghost_child] = [p for p in graph_parents[ghost_child]
86
progress_bar.finished()
87
graph_parents["top:"] = start_revs
89
if len(graph_parents)>0:
90
merge_sorted_revisions = merge_sort(
95
merge_sorted_revisions = ()
98
merge_sorted_revisions = [elem for elem in merge_sorted_revisions \
101
assert merge_sorted_revisions[0][1] == "top:"
102
merge_sorted_revisions = merge_sorted_revisions[1:]
107
# This will hold an item for each "branch". For a revisions, the revsion
108
# number less the least significant digit is the branch_id, and used as the
109
# key for the dict. Hence revision with the same revsion number less the
110
# least significant digit are considered to be in the same branch line.
111
# e.g.: for revisions 290.12.1 and 290.12.2, the branch_id would be 290.12,
112
# and these two revisions will be in the same branch line. Each value is
113
# a list of rev_indexes in the branch.
118
update_root_progress(3)
119
progress_bar = ui.ui_factory.nested_progress_bar()
121
progress_bar.update("Finding nodes", 0, len(merge_sorted_revisions))
122
for (rev_index, (sequence_number,
126
end_of_merge)) in enumerate(merge_sorted_revisions):
128
if rev_index % 25 == 0:
129
progress_bar.update(None, rev_index)
130
if maxnum and rev_index >= maxnum:
132
revid_index[revid] = rev_index
134
parents = graph_parents[revid]
135
linegraph.append([revid,
143
revno_index[revno_sequence] = rev_index
145
branch_id = revno_sequence[0:-1]
148
if branch_id not in branch_lines:
150
branch_lines[branch_id] = branch_line
152
branch_line = branch_lines[branch_id]
154
branch_line.append(rev_index)
156
progress_bar.finished()
159
branch_ids = branch_lines.keys()
161
def branch_id_cmp(x, y):
162
"""Compaire branch_id's first by the number of digits, then reversed
168
return cmp(len_x, len_y)
170
branch_ids.sort(branch_id_cmp)
171
# This will hold a tuple of (child_index, parent_index, col_index) for each
172
# line that needs to be drawn. If col_index is not none, then the line is
173
# drawn along that column, else the the line can be drawn directly between
174
# the child and parent because either the child and parent are in the same
175
# branch line, or the child and parent are 1 row apart.
177
empty_column = [False for i in range(len(graph_parents))]
178
# This will hold a bit map for each cell. If the cell is true, then the
179
# cell allready contains a node or line. This use when deciding what column
180
# to place a branch line or line in, without it overlaping something else.
181
columns = [list(empty_column)]
184
update_root_progress(4)
185
progress_bar = ui.ui_factory.nested_progress_bar()
187
progress_bar.update("Organizing edges", 0, len(branch_ids))
188
for i, branch_id in enumerate(branch_ids):
190
progress_bar.update(None, i)
191
branch_line = branch_lines[branch_id]
193
# Find the col_index for the direct parent branch. This will be the
194
# starting point when looking for a free column.
197
if len(branch_id) > 1:
198
parent_revno = branch_id[0:-1]
199
if parent_revno in revno_index:
200
parent_index = revno_index[parent_revno]
201
parent_node = linegraph[parent_index][1]
203
parent_col_index = parent_node[0]
206
col_search_order = _branch_line_col_search_order(columns,
208
color = reduce(lambda x, y: x+y, branch_id, 0)
212
last_rev_index = None
213
for rev_index in branch_line:
215
if broken_line_length and \
216
rev_index - last_rev_index > broken_line_length:
217
line_range.append(last_rev_index+1)
218
line_range.append(rev_index-1)
220
line_range.extend(range(last_rev_index+1, rev_index))
222
line_range.append(rev_index)
223
last_rev_index = rev_index
226
if broken_line_length and \
227
parent_index - last_rev_index > broken_line_length:
228
line_range.append(last_rev_index+1)
230
line_range.extend(range(last_rev_index+1, parent_index))
232
col_index = _find_free_column(columns,
236
node = (col_index, color)
237
for rev_index in branch_line:
238
linegraph[rev_index][1] = node
239
columns[col_index][rev_index] = True
241
for rev_index in branch_line:
246
end_of_merge) = merge_sorted_revisions[rev_index]
248
linegraph[rev_index][4] = graph_children[revid]
249
col_index = linegraph[rev_index][1][0]
251
for parent_revid in graph_parents[revid]:
252
if parent_revid in revid_index:
254
parent_index = revid_index[parent_revid]
255
parent_node = linegraph[parent_index][1]
257
parent_col_index = parent_node[0]
259
parent_col_index = None
261
_line_col_search_order(columns,
265
# If this line is really long, break it.
266
if len(branch_id) > 0 and \
267
broken_line_length and \
268
parent_index - rev_index > broken_line_length:
269
child_line_col_index = \
270
_find_free_column(columns,
274
_mark_column_as_used(columns,
275
child_line_col_index,
278
# Recall _line_col_search_order to reset it back to
281
_line_col_search_order(columns,
284
parent_col_line_index = \
285
_find_free_column(columns,
289
_mark_column_as_used(columns,
290
parent_col_line_index,
292
lines.append((rev_index,
294
(child_line_col_index,
295
parent_col_line_index)))
297
line_col_index = col_index
298
if parent_index - rev_index >1:
299
line_range = range(rev_index + 1, parent_index)
301
_find_free_column(columns,
305
_mark_column_as_used(columns,
308
lines.append((rev_index,
312
progress_bar.finished()
314
update_root_progress(5)
315
progress_bar = ui.ui_factory.nested_progress_bar()
317
progress_bar.update("Prettifying graph", 0, len(lines))
318
for i, (child_index, parent_index, line_col_indexes) in enumerate(lines):
320
progress_bar.update(None, i)
321
(child_col_index, child_color) = linegraph[child_index][1]
322
(parent_col_index, parent_color) = linegraph[parent_index][1]
324
if len(line_col_indexes) == 1:
325
if parent_index - child_index == 1:
326
linegraph[child_index][2].append(
331
# line from the child's column to the lines column
332
linegraph[child_index][2].append(
336
# lines down the line's column
337
for line_part_index in range(child_index+1, parent_index-1):
338
linegraph[line_part_index][2].append(
339
(line_col_indexes[0],
342
# line from the line's column to the parent's column
343
linegraph[parent_index-1][2].append(
344
(line_col_indexes[0],
349
# line from the child's column to the lines column
350
linegraph[child_index][2].append(
355
linegraph[child_index+1][2].append(
356
(line_col_indexes[0],
361
linegraph[parent_index-2][2].append(
365
# line from the line's column to the parent's column
366
linegraph[parent_index-1][2].append(
367
(line_col_indexes[1],
371
progress_bar.finished()
372
return (linegraph, revid_index, len(columns))
374
return (linegraph, revid_index, 0)
377
def _branch_line_col_search_order(columns, parent_col_index):
378
for col_index in range(parent_col_index, len(columns)):
380
for col_index in range(parent_col_index-1, -1, -1):
383
def _line_col_search_order(columns, parent_col_index, child_col_index):
384
if parent_col_index is not None:
385
max_index = max(parent_col_index, child_col_index)
386
min_index = min(parent_col_index, child_col_index)
387
for col_index in range(max_index, min_index -1, -1):
390
max_index = child_col_index
391
min_index = child_col_index
392
yield child_col_index
394
while max_index + i < len(columns) or \
396
if max_index + i < len(columns):
398
if min_index - i > -1:
402
def _find_free_column(columns, empty_column, col_search_order, line_range):
403
for col_index in col_search_order:
404
column = columns[col_index]
405
has_overlaping_line = False
406
for row_index in line_range:
407
if column[row_index]:
408
has_overlaping_line = True
410
if not has_overlaping_line:
413
col_index = len(columns)
414
column = list(empty_column)
415
columns.append(column)
418
def _mark_column_as_used(columns, col_index, line_range):
419
column = columns[col_index]
420
for row_index in line_range:
421
column[row_index] = True
423
def same_branch(a, b):
424
"""Return whether we think revisions a and b are on the same branch."""
425
if len(a.parent_ids) == 1:
426
# Defacto same branch if only parent
428
elif a.committer == b.committer:
429
# Same committer so may as well be
1
# -*- coding: UTF-8 -*-
2
"""Directed graph production.
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
9
__copyright__ = "Copyright © 2005 Canonical Ltd."
10
__author__ = "Scott James Remnant <scott@ubuntu.com>"
13
from bzrlib.revision import Revision
14
from bzrlib.tsort import merge_sort
17
class DummyRevision(Revision):
18
"""Dummy bzr revision.
20
Sometimes, especially in older bzr branches, a revision is referenced
21
as the parent of another but not actually present in the branch's store.
22
When this happens we use an instance of this class instead of the real
23
Revision object (which we can't get).
25
def __init__(self, revid):
26
super(DummyRevision, self).__init__(revid)
33
class RevisionProxy(object):
34
"""A revision proxy object.
36
This will demand load the revision it represents when the committer or
37
message attributes are accessed in order to populate them. It is
38
constructed with the revision id and parent_ids list and a repository
39
object to request the revision from when needed.
42
def __init__(self, revid, parent_ids, repository):
43
self.revision_id = revid
44
self.parent_ids = parent_ids
45
self._repository = repository
48
def _get_attribute_getter(attr):
49
def get_attribute(self):
50
if self._revision is None:
52
return getattr(self._revision, attr)
54
committer = property(_get_attribute_getter('committer'))
55
message = property(_get_attribute_getter('message'))
56
properties = property(_get_attribute_getter('properties'))
57
timestamp = property(_get_attribute_getter('timestamp'))
58
timezone = property(_get_attribute_getter('timezone'))
61
"""Load the revision object."""
62
self._revision = self._repository.get_revision(self.revision_id)
65
class DistanceMethod(object):
67
def __init__(self, branch, start):
72
self.children_of_id = {start: set()}
73
self.parent_ids_of = {}
74
self.colours = { start: 0 }
76
self.direct_parent_of = {}
79
def fill_caches(self):
80
graph = self.branch.repository.get_revision_graph_with_ghosts([self.start])
81
for revid in graph.ghosts:
82
self.cache_revision(DummyRevision(revid))
83
for revid, parents in graph.get_ancestors().items():
84
self.cache_revision(RevisionProxy(revid, parents, self.branch.repository))
86
def cache_revision(self, revision):
87
"Set the caches for a newly retrieved revision."""
88
revid = revision.revision_id
89
# Build a revision cache
90
self.revisions[revid] = revision
91
# Build a children dictionary
92
for parent_id in revision.parent_ids:
93
self.children_of_id.setdefault(parent_id, set()).add(revision)
94
# Build a parents dictionnary, where redundant parents will be removed,
95
# and that will be passed along tothe rest of program.
96
if len(revision.parent_ids) != len(set(revision.parent_ids)):
97
# fix the parent_ids list.
99
parent_ids_set = set()
100
for parent_id in revision.parent_ids:
101
if parent_id in parent_ids_set:
103
parent_ids.append(parent_id)
104
parent_ids_set.add(parent_id)
105
revision.parent_ids = parent_ids
106
self.parent_ids_of[revision] = list(revision.parent_ids)
107
self.graph[revid] = revision.parent_ids
109
def make_children_map(self):
110
revisions = self.revisions
111
return dict((revisions[revid], c)
112
for (revid, c) in self.children_of_id.iteritems())
114
def sort_revisions(self, sorted_revids, maxnum):
115
revisions = self.revisions
116
parent_ids_of = self.parent_ids_of
117
children_of_id = self.children_of_id
118
# Try to compact sequences of revisions on the same branch.
121
expected_id = sorted_revids[0]
124
revid = sorted_revids.pop(0)
125
if revid != expected_id:
126
skipped_revids.append(revid)
128
revision = revisions[revid]
129
for child in children_of_id[revid]:
130
# postpone if any child is missing
131
if child.revision_id not in distances:
132
if expected_id not in pending_ids:
133
pending_ids.append(expected_id)
134
expected_id = pending_ids.pop(0)
135
skipped_revids.append(revid)
136
sorted_revids[:0] = skipped_revids
137
del skipped_revids[:]
140
# all children are here, push!
141
distances[revid] = len(distances)
142
if maxnum is not None and len(distances) > maxnum:
143
# bail out early if a limit was specified
144
sorted_revids[:0] = skipped_revids
145
for revid in sorted_revids:
146
distances[revid] = len(distances)
148
# all parents will need to be pushed as soon as possible
149
for parent in parent_ids_of[revision]:
150
if parent not in pending_ids:
151
pending_ids.insert(0, parent)
154
expected_id = pending_ids.pop(0)
155
# if the next expected revid has already been skipped, requeue
156
# the skipped ids, except those that would go right back to the
158
if expected_id in skipped_revids:
159
pos = skipped_revids.index(expected_id)
160
sorted_revids[:0] = skipped_revids[pos:]
161
del skipped_revids[pos:]
162
self.distances = distances
163
return sorted(distances, key=distances.get)
165
def choose_colour(self, revid):
166
revision = self.revisions[revid]
167
children_of_id = self.children_of_id
168
parent_ids_of = self.parent_ids_of
169
colours = self.colours
171
the_children = children_of_id[revid]
172
if len(the_children) == 1:
173
[child] = the_children
174
if len(parent_ids_of[child]) == 1:
175
# one-one relationship between parent and child, same
177
colours[revid] = colours[child.revision_id]
179
self.choose_colour_one_child(revision, child)
181
self.choose_colour_many_children(revision, the_children)
183
def choose_colour_one_child(self, revision, child):
184
revid = revision.revision_id
185
direct_parent_of = self.direct_parent_of
186
revisions = self.revisions
187
# one child with multiple parents, the first parent with
188
# the same committer gets the colour
189
direct_parent = direct_parent_of.get(child)
190
if direct_parent is None:
191
# if it has not been found yet, find it now and remember
192
for parent_id in self.parent_ids_of[child]:
193
parent_revision = revisions[parent_id]
194
if parent_revision.committer == child.committer:
195
# found the first parent with the same committer
196
direct_parent = parent_revision
197
direct_parent_of[child] = direct_parent
199
if direct_parent == revision:
200
self.colours[revid] = self.colours[child.revision_id]
202
self.colours[revid] = self.last_colour = self.last_colour + 1
204
def choose_colour_many_children(self, revision, the_children):
205
"""Colour revision revision."""
206
revid = revision.revision_id
207
direct_parent_of = self.direct_parent_of
208
# multiple children, get the colour of the last displayed child
209
# with the same committer which does not already have its colour
212
for child in the_children:
213
if child.committer != revision.committer:
215
direct_parent = direct_parent_of.get(child)
216
if direct_parent == revision:
217
self.colours[revid] = self.colours[child.revision_id]
219
# FIXME: Colouring based on whats been displayed MUST be done with
220
# knowledge of the revisions being output.
221
# until the refactoring to fold graph() into this more compactly is
222
# done, I've disabled this reuse. RBC 20060403
223
# if direct_parent is None:
224
# available[child] = distances[child.revision_id]
225
# .. it will be something like available[child] = \
226
# revs[child.revision_id][0] - which is the sequence number
229
sorted_children = sorted(available, key=available.get)
230
child = sorted_children[-1]
231
direct_parent_of[child] = revision
232
self.colours[revid] = self.colours[child.revision_id]
234
# no candidate children is available, pick the next
236
self.colours[revid] = self.last_colour = self.last_colour + 1
239
def distances(branch, start):
240
"""Sort the revisions.
242
Traverses the branch revision tree starting at start and produces an
243
ordered list of revisions such that a revision always comes after
244
any revision it is the parent of.
246
Returns a tuple of (revids, revisions, colours, children)
248
distance = DistanceMethod(branch, start)
249
distance.fill_caches()
250
distance.merge_sorted = merge_sort(distance.graph, distance.start)
251
children = distance.make_children_map()
253
for seq, revid, merge_depth, end_of_merge in distance.merge_sorted:
254
distance.choose_colour(revid)
256
revisions = distance.revisions
257
colours = distance.colours
258
parent_ids_of = distance.parent_ids_of
259
return (revisions, colours, children, parent_ids_of, distance.merge_sorted)
262
def graph(revisions, colours, merge_sorted):
263
"""Produce a directed graph of a bzr branch.
265
For each revision it then yields a tuple of (revision, node, lines).
266
If the revision is only referenced in the branch and not present in the
267
store, revision will be a DummyRevision object, otherwise it is the bzr
268
Revision object with the meta-data for the revision.
270
Node is a tuple of (column, colour) with column being a zero-indexed
271
column number of the graph that this revision represents and colour
272
being a zero-indexed colour (which doesn't specify any actual colour
273
in particular) to draw the node in.
275
Lines is a list of tuples which represent lines you should draw away
276
from the revision, if you also need to draw lines into the revision
277
you should use the lines list from the previous iteration. Each
278
typle in the list is in the form (start, end, colour) with start and
279
end being zero-indexed column numbers and colour as in node.
281
It's up to you how to actually draw the nodes and lines (straight,
282
curved, kinked, etc.) and to pick the actual colours for each index.
284
if not len(merge_sorted):
286
# split merge_sorted into a map:
288
# FIXME: get a hint on this from the merge_sorted data rather than
289
# calculating it ourselves
290
# mapping from rev_id to the sequence number of the next lowest rev
292
# mapping from rev_id to next-in-branch-revid - may be None for end
294
next_branch_revid = {}
295
# the stack we are in in the sorted data for determining which
296
# next_lower_rev to set. It is a stack which has one list at each
297
# depth - the ids at that depth that need the same id allocated.
299
for seq, revid, indent, end_merge in merge_sorted:
300
revs[revid] = (seq, indent, end_merge)
301
if indent == len(current_stack):
302
# new merge group starts
303
current_stack.append([revid])
304
elif indent == len(current_stack) - 1:
305
# part of the current merge group
306
current_stack[-1].append(revid)
308
# end of a merge group
309
while current_stack[-1]:
310
stack_rev_id = current_stack[-1].pop()
311
# record the next lower rev for this rev:
312
next_lower_rev[stack_rev_id] = seq
313
# if this followed a non-end-merge rev in this group note that
314
if len(current_stack[-1]):
315
if not revs[current_stack[-1][-1]][2]:
316
next_branch_revid[current_stack[-1][-1]] = stack_rev_id
318
# append to the now-current merge group
319
current_stack[-1].append(revid)
320
# assign a value to all the depth 0 revisions
321
while current_stack[-1]:
322
stack_rev_id = current_stack[-1].pop()
323
# record the next lower rev for this rev:
324
next_lower_rev[stack_rev_id] = len(merge_sorted)
325
# if this followed a non-end-merge rev in this group note that
326
if len(current_stack[-1]):
327
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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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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# 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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n_idx = new_hanging.index(revision_id)
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# force this to be vertical at the place this rev was
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new_hanging.insert(to_idx, revision_id)
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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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# 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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# 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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# 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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# 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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# 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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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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# draw a line from the previous position of this line to the
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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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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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elif a.committer == b.committer:
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# Same committer so may as well be