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>"
12
from bzrlib.revision import NULL_REVISION
13
from bzrlib.tsort import merge_sort
15
def linegraph(repository, start_revs, maxnum, broken_line_length = None,
16
graph_data = True, mainline_only = False):
17
"""Produce a directed graph of a bzr repository.
19
Returns a tuple of (line_graph, revid_index, columns_len) where
20
* line_graph is a list of tuples of (revid,
26
* revid_index is a dict of each revision with the key being the revid, and
27
the value the row index, and
28
* columns_len is the number of columns need to draw the line graph.
31
Node is a tuple of (column, colour) with column being a zero-indexed
32
column number of the graph that this revision represents and colour
33
being a zero-indexed colour (which doesn't specify any actual colour
34
in particular) to draw the node in.
36
Lines is a list of tuples which represent lines you should draw away
37
from the revision, if you also need to draw lines into the revision
38
you should use the lines list from the previous iteration. Each
39
typle in the list is in the form (start, end, colour) with start and
40
end being zero-indexed column numbers and colour as in node.
42
It's up to you how to actually draw the nodes and lines (straight,
43
curved, kinked, etc.) and to pick the actual colours for each index.
46
graph = repository.get_graph()
50
for (revid, parent_revids) in graph.iter_ancestry(start_revs):
51
if parent_revids is None:
54
if parent_revids == (NULL_REVISION,):
55
graph_parents[revid] = ()
57
graph_parents[revid] = parent_revids
58
for parent in parent_revids:
59
graph_children.setdefault(parent, []).append(revid)
60
graph_children.setdefault(revid, [])
62
for ghost_child in graph_children[ghost]:
63
graph_parents[ghost_child] = [p for p in graph_parents[ghost_child]
65
graph_parents["top:"] = start_revs
67
if len(graph_parents)>0:
68
merge_sorted_revisions = merge_sort(
73
merge_sorted_revisions = ()
76
merge_sorted_revisions = [elem for elem in merge_sorted_revisions \
79
assert merge_sorted_revisions[0][1] == "top:"
80
merge_sorted_revisions = merge_sorted_revisions[1:]
85
# This will hold an item for each "branch". For a revisions, the revsion
86
# number less the least significant digit is the branch_id, and used as the
87
# key for the dict. Hence revision with the same revsion number less the
88
# least significant digit are considered to be in the same branch line.
89
# e.g.: for revisions 290.12.1 and 290.12.2, the branch_id would be 290.12,
90
# and these two revisions will be in the same branch line. Each value is
91
# a list of rev_indexes in the branch.
96
for (rev_index, (sequence_number,
100
end_of_merge)) in enumerate(merge_sorted_revisions):
101
if maxnum and rev_index >= maxnum:
103
revid_index[revid] = rev_index
105
parents = graph_parents[revid]
106
linegraph.append([revid,
114
revno_index[revno_sequence] = rev_index
116
branch_id = revno_sequence[0:-1]
119
if branch_id not in branch_lines:
121
branch_lines[branch_id] = branch_line
123
branch_line = branch_lines[branch_id]
125
branch_line.append(rev_index)
128
branch_ids = branch_lines.keys()
130
def branch_id_cmp(x, y):
131
"""Compaire branch_id's first by the number of digits, then reversed
137
return cmp(len_x, len_y)
139
branch_ids.sort(branch_id_cmp)
140
# This will hold a tuple of (child_index, parent_index, col_index) for each
141
# line that needs to be drawn. If col_index is not none, then the line is
142
# drawn along that column, else the the line can be drawn directly between
143
# the child and parent because either the child and parent are in the same
144
# branch line, or the child and parent are 1 row apart.
146
empty_column = [False for i in range(len(graph_parents))]
147
# This will hold a bit map for each cell. If the cell is true, then the
148
# cell allready contains a node or line. This use when deciding what column
149
# to place a branch line or line in, without it overlaping something else.
150
columns = [list(empty_column)]
153
for branch_id in branch_ids:
154
branch_line = branch_lines[branch_id]
156
# Find the col_index for the direct parent branch. This will be the
157
# starting point when looking for a free column.
160
if len(branch_id) > 1:
161
parent_revno = branch_id[0:-1]
162
if parent_revno in revno_index:
163
parent_index = revno_index[parent_revno]
164
parent_node = linegraph[parent_index][1]
166
parent_col_index = parent_node[0]
169
col_search_order = _branch_line_col_search_order(columns,
171
color = reduce(lambda x, y: x+y, branch_id, 0)
175
last_rev_index = None
176
for rev_index in branch_line:
178
if broken_line_length and \
179
rev_index - last_rev_index > broken_line_length:
180
line_range.append(last_rev_index+1)
181
line_range.append(rev_index-1)
183
line_range.extend(range(last_rev_index+1, rev_index))
185
line_range.append(rev_index)
186
last_rev_index = rev_index
189
if broken_line_length and \
190
parent_index - last_rev_index > broken_line_length:
191
line_range.append(last_rev_index+1)
193
line_range.extend(range(last_rev_index+1, parent_index))
195
col_index = _find_free_column(columns,
199
node = (col_index, color)
200
for rev_index in branch_line:
201
linegraph[rev_index][1] = node
202
columns[col_index][rev_index] = True
204
for rev_index in branch_line:
209
end_of_merge) = merge_sorted_revisions[rev_index]
211
linegraph[rev_index][4] = graph_children[revid]
212
col_index = linegraph[rev_index][1][0]
214
for parent_revid in graph_parents[revid]:
215
if parent_revid in revid_index:
217
parent_index = revid_index[parent_revid]
218
parent_node = linegraph[parent_index][1]
220
parent_col_index = parent_node[0]
222
parent_col_index = None
224
_line_col_search_order(columns,
228
# If this line is really long, break it.
229
if len(branch_id) > 0 and \
230
broken_line_length and \
231
parent_index - rev_index > broken_line_length:
232
child_line_col_index = \
233
_find_free_column(columns,
237
_mark_column_as_used(columns,
238
child_line_col_index,
241
# Recall _line_col_search_order to reset it back to
244
_line_col_search_order(columns,
247
parent_col_line_index = \
248
_find_free_column(columns,
252
_mark_column_as_used(columns,
253
parent_col_line_index,
255
lines.append((rev_index,
257
(child_line_col_index,
258
parent_col_line_index)))
260
line_col_index = col_index
261
if parent_index - rev_index >1:
262
line_range = range(rev_index + 1, parent_index)
264
_find_free_column(columns,
268
_mark_column_as_used(columns,
271
lines.append((rev_index,
275
for (child_index, parent_index, line_col_indexes) in lines:
276
(child_col_index, child_color) = linegraph[child_index][1]
277
(parent_col_index, parent_color) = linegraph[parent_index][1]
279
if len(line_col_indexes) == 1:
280
if parent_index - child_index == 1:
281
linegraph[child_index][2].append(
286
# line from the child's column to the lines column
287
linegraph[child_index][2].append(
291
# lines down the line's column
292
for line_part_index in range(child_index+1, parent_index-1):
293
linegraph[line_part_index][2].append(
294
(line_col_indexes[0],
297
# line from the line's column to the parent's column
298
linegraph[parent_index-1][2].append(
299
(line_col_indexes[0],
304
# line from the child's column to the lines column
305
linegraph[child_index][2].append(
310
linegraph[child_index+1][2].append(
311
(line_col_indexes[0],
316
linegraph[parent_index-2][2].append(
320
# line from the line's column to the parent's column
321
linegraph[parent_index-1][2].append(
322
(line_col_indexes[1],
325
return (linegraph, revid_index, len(columns))
327
return (linegraph, revid_index, 0)
330
def _branch_line_col_search_order(columns, parent_col_index):
331
for col_index in range(parent_col_index, len(columns)):
333
for col_index in range(parent_col_index-1, -1, -1):
336
def _line_col_search_order(columns, parent_col_index, child_col_index):
337
if parent_col_index is not None:
338
max_index = max(parent_col_index, child_col_index)
339
min_index = min(parent_col_index, child_col_index)
340
for col_index in range(max_index, min_index -1, -1):
343
max_index = child_col_index
344
min_index = child_col_index
345
yield child_col_index
347
while max_index + i < len(columns) or \
349
if max_index + i < len(columns):
351
if min_index - i > -1:
355
def _find_free_column(columns, empty_column, col_search_order, line_range):
356
for col_index in col_search_order:
357
column = columns[col_index]
358
has_overlaping_line = False
359
for row_index in line_range:
360
if column[row_index]:
361
has_overlaping_line = True
363
if not has_overlaping_line:
366
col_index = len(columns)
367
column = list(empty_column)
368
columns.append(column)
371
def _mark_column_as_used(columns, col_index, line_range):
372
column = columns[col_index]
373
for row_index in line_range:
374
column[row_index] = True
376
def same_branch(a, b):
377
"""Return whether we think revisions a and b are on the same branch."""
378
if len(a.parent_ids) == 1:
379
# Defacto same branch if only parent
381
elif a.committer == b.committer:
382
# 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)
31
class RevisionProxy(object):
32
"""A revision proxy object.
34
This will demand load the revision it represents when the committer or
35
message attributes are accessed in order to populate them. It is
36
constructed with the revision id and parent_ids list and a repository
37
object to request the revision from when needed.
40
def __init__(self, revid, parent_ids, repository):
41
self.revision_id = revid
42
self.parent_ids = parent_ids
43
self._repository = repository
46
def _get_attribute_getter(attr):
47
def get_attribute(self):
48
if self._revision is None:
50
return getattr(self._revision, attr)
52
committer = property(_get_attribute_getter('committer'))
53
message = property(_get_attribute_getter('message'))
54
properties = property(_get_attribute_getter('properties'))
55
timestamp = property(_get_attribute_getter('timestamp'))
56
timezone = property(_get_attribute_getter('timezone'))
59
"""Load the revision object."""
60
self._revision = self._repository.get_revision(self.revision_id)
63
class DistanceMethod(object):
65
def __init__(self, branch, start):
70
self.children_of_id = {start: set()}
71
self.parent_ids_of = {}
72
self.colours = { start: 0 }
74
self.direct_parent_of = {}
77
def fill_caches(self):
78
graph = self.branch.repository.get_revision_graph_with_ghosts([self.start])
79
for revid in graph.ghosts:
80
self.cache_revision(DummyRevision(revid))
81
for revid, parents in graph.get_ancestors().items():
82
self.cache_revision(RevisionProxy(revid, parents, self.branch.repository))
84
def cache_revision(self, revision):
85
"Set the caches for a newly retrieved revision."""
86
revid = revision.revision_id
87
# Build a revision cache
88
self.revisions[revid] = revision
89
# Build a children dictionary
90
for parent_id in revision.parent_ids:
91
self.children_of_id.setdefault(parent_id, set()).add(revision)
92
# Build a parents dictionnary, where redundant parents will be removed,
93
# and that will be passed along tothe rest of program.
94
if len(revision.parent_ids) != len(set(revision.parent_ids)):
95
# fix the parent_ids list.
97
parent_ids_set = set()
98
for parent_id in revision.parent_ids:
99
if parent_id in parent_ids_set:
101
parent_ids.append(parent_id)
102
parent_ids_set.add(parent_id)
103
revision.parent_ids = parent_ids
104
self.parent_ids_of[revision] = list(revision.parent_ids)
105
self.graph[revid] = revision.parent_ids
107
def make_children_map(self):
108
revisions = self.revisions
109
return dict((revisions[revid], c)
110
for (revid, c) in self.children_of_id.iteritems())
112
def sort_revisions(self, sorted_revids, maxnum):
113
revisions = self.revisions
114
parent_ids_of = self.parent_ids_of
115
children_of_id = self.children_of_id
116
# Try to compact sequences of revisions on the same branch.
119
expected_id = sorted_revids[0]
122
revid = sorted_revids.pop(0)
123
if revid != expected_id:
124
skipped_revids.append(revid)
126
revision = revisions[revid]
127
for child in children_of_id[revid]:
128
# postpone if any child is missing
129
if child.revision_id not in distances:
130
if expected_id not in pending_ids:
131
pending_ids.append(expected_id)
132
expected_id = pending_ids.pop(0)
133
skipped_revids.append(revid)
134
sorted_revids[:0] = skipped_revids
135
del skipped_revids[:]
138
# all children are here, push!
139
distances[revid] = len(distances)
140
if maxnum is not None and len(distances) > maxnum:
141
# bail out early if a limit was specified
142
sorted_revids[:0] = skipped_revids
143
for revid in sorted_revids:
144
distances[revid] = len(distances)
146
# all parents will need to be pushed as soon as possible
147
for parent in parent_ids_of[revision]:
148
if parent not in pending_ids:
149
pending_ids.insert(0, parent)
152
expected_id = pending_ids.pop(0)
153
# if the next expected revid has already been skipped, requeue
154
# the skipped ids, except those that would go right back to the
156
if expected_id in skipped_revids:
157
pos = skipped_revids.index(expected_id)
158
sorted_revids[:0] = skipped_revids[pos:]
159
del skipped_revids[pos:]
160
self.distances = distances
161
return sorted(distances, key=distances.get)
163
def choose_colour(self, revid):
164
revision = self.revisions[revid]
165
children_of_id = self.children_of_id
166
parent_ids_of = self.parent_ids_of
167
colours = self.colours
169
the_children = children_of_id[revid]
170
if len(the_children) == 1:
171
[child] = the_children
172
if len(parent_ids_of[child]) == 1:
173
# one-one relationship between parent and child, same
175
colours[revid] = colours[child.revision_id]
177
self.choose_colour_one_child(revision, child)
179
self.choose_colour_many_children(revision, the_children)
181
def choose_colour_one_child(self, revision, child):
182
revid = revision.revision_id
183
direct_parent_of = self.direct_parent_of
184
revisions = self.revisions
185
# one child with multiple parents, the first parent with
186
# the same committer gets the colour
187
direct_parent = direct_parent_of.get(child)
188
if direct_parent is None:
189
# if it has not been found yet, find it now and remember
190
for parent_id in self.parent_ids_of[child]:
191
parent_revision = revisions[parent_id]
192
if parent_revision.committer == child.committer:
193
# found the first parent with the same committer
194
direct_parent = parent_revision
195
direct_parent_of[child] = direct_parent
197
if direct_parent == revision:
198
self.colours[revid] = self.colours[child.revision_id]
200
self.colours[revid] = self.last_colour = self.last_colour + 1
202
def choose_colour_many_children(self, revision, the_children):
203
"""Colour revision revision."""
204
revid = revision.revision_id
205
direct_parent_of = self.direct_parent_of
206
# multiple children, get the colour of the last displayed child
207
# with the same committer which does not already have its colour
210
for child in the_children:
211
if child.committer != revision.committer:
213
direct_parent = direct_parent_of.get(child)
214
if direct_parent == revision:
215
self.colours[revid] = self.colours[child.revision_id]
217
# FIXME: Colouring based on whats been displayed MUST be done with
218
# knowledge of the revisions being output.
219
# until the refactoring to fold graph() into this more compactly is
220
# done, I've disabled this reuse. RBC 20060403
221
# if direct_parent is None:
222
# available[child] = distances[child.revision_id]
223
# .. it will be something like available[child] = \
224
# revs[child.revision_id][0] - which is the sequence number
227
sorted_children = sorted(available, key=available.get)
228
child = sorted_children[-1]
229
direct_parent_of[child] = revision
230
self.colours[revid] = self.colours[child.revision_id]
232
# no candidate children is available, pick the next
234
self.colours[revid] = self.last_colour = self.last_colour + 1
237
def distances(branch, start):
238
"""Sort the revisions.
240
Traverses the branch revision tree starting at start and produces an
241
ordered list of revisions such that a revision always comes after
242
any revision it is the parent of.
244
Returns a tuple of (revids, revisions, colours, children)
246
distance = DistanceMethod(branch, start)
247
distance.fill_caches()
248
distance.merge_sorted = merge_sort(distance.graph, distance.start)
249
children = distance.make_children_map()
251
for seq, revid, merge_depth, end_of_merge in distance.merge_sorted:
252
distance.choose_colour(revid)
254
revisions = distance.revisions
255
colours = distance.colours
256
parent_ids_of = distance.parent_ids_of
257
return (revisions, colours, children, parent_ids_of, distance.merge_sorted)
260
def graph(revisions, colours, merge_sorted):
261
"""Produce a directed graph of a bzr branch.
263
For each revision it then yields a tuple of (revision, node, lines).
264
If the revision is only referenced in the branch and not present in the
265
store, revision will be a DummyRevision object, otherwise it is the bzr
266
Revision object with the meta-data for the revision.
268
Node is a tuple of (column, colour) with column being a zero-indexed
269
column number of the graph that this revision represents and colour
270
being a zero-indexed colour (which doesn't specify any actual colour
271
in particular) to draw the node in.
273
Lines is a list of tuples which represent lines you should draw away
274
from the revision, if you also need to draw lines into the revision
275
you should use the lines list from the previous iteration. Each
276
typle in the list is in the form (start, end, colour) with start and
277
end being zero-indexed column numbers and colour as in node.
279
It's up to you how to actually draw the nodes and lines (straight,
280
curved, kinked, etc.) and to pick the actual colours for each index.
282
if not len(merge_sorted):
284
# split merge_sorted into a map:
286
# FIXME: get a hint on this from the merge_sorted data rather than
287
# calculating it ourselves
288
# mapping from rev_id to the sequence number of the next lowest rev
290
# mapping from rev_id to next-in-branch-revid - may be None for end
292
next_branch_revid = {}
293
# the stack we are in in the sorted data for determining which
294
# next_lower_rev to set. It is a stack which has one list at each
295
# depth - the ids at that depth that need the same id allocated.
297
for seq, revid, indent, end_merge in merge_sorted:
298
revs[revid] = (seq, indent, end_merge)
299
if indent == len(current_stack):
300
# new merge group starts
301
current_stack.append([revid])
302
elif indent == len(current_stack) - 1:
303
# part of the current merge group
304
current_stack[-1].append(revid)
306
# end of a merge group
307
while current_stack[-1]:
308
stack_rev_id = current_stack[-1].pop()
309
# record the next lower rev for this rev:
310
next_lower_rev[stack_rev_id] = seq
311
# if this followed a non-end-merge rev in this group note that
312
if len(current_stack[-1]):
313
if not revs[current_stack[-1][-1]][2]:
314
next_branch_revid[current_stack[-1][-1]] = stack_rev_id
316
# append to the now-current merge group
317
current_stack[-1].append(revid)
318
# assign a value to all the depth 0 revisions
319
while current_stack[-1]:
320
stack_rev_id = current_stack[-1].pop()
321
# record the next lower rev for this rev:
322
next_lower_rev[stack_rev_id] = len(merge_sorted)
323
# if this followed a non-end-merge rev in this group note that
324
if len(current_stack[-1]):
325
if not revs[current_stack[-1][-1]][2]:
326
next_branch_revid[current_stack[-1][-1]] = stack_rev_id
328
# a list of the current revisions we are drawing lines TO indicating
329
# the sequence of their lines on the screen.
330
# i.e. [A, B, C] means that the line to A, to B, and to C are in
331
# (respectively), 0, 1, 2 on the screen.
332
hanging = [merge_sorted[0][1]]
333
for seq, revid, indent, end_merge in merge_sorted:
334
# a list of the lines to draw: their position in the
335
# previous row, their position in this row, and the colour
336
# (which is the colour they are routing to).
341
for h_idx, hang in enumerate(hanging):
342
# one of these will be the current lines node:
343
# we are drawing a line. h_idx
345
# we have found the current lines node
346
node = (h_idx, colours[revid])
348
# note that we might have done the main parent
349
drawn_parents = set()
351
def draw_line(from_idx, to_idx, revision_id):
353
n_idx = new_hanging.index(revision_id)
355
# force this to be vertical at the place this rev was
357
new_hanging.insert(to_idx, revision_id)
359
lines.append((from_idx, n_idx, colours[revision_id]))
362
# we want to draw a line to the next commit on 'this' branch
364
# drop this line first.
365
parent_id = next_branch_revid[revid]
366
draw_line(h_idx, h_idx, parent_id)
367
# we have drawn this parent
368
drawn_parents.add(parent_id)
370
# this is the last revision in a 'merge', show where it came from
371
if len(revisions[revid].parent_ids) > 1:
373
# parents means this commit was a merge, and being
374
# the end point of a merge group means that all
375
# the parent revisions were merged into branches
376
# to the left of this before this was committed
377
# - so we want to show this as a new branch from
379
# to do this, we show the parent with the lowest
380
# sequence number, which is the one that this
381
# branch 'spawned from', and no others.
382
# If this sounds like a problem, remember that:
383
# if the parent was not already in our mainline
384
# it would show up as a merge into this making
385
# this not the end of a merge-line.
386
lowest = len(merge_sorted)
387
for parent_id in revisions[revid].parent_ids:
388
if revs[parent_id][0] < lowest:
389
lowest = revs[parent_id][0]
390
assert lowest != len(merge_sorted)
391
draw_line(h_idx, len(new_hanging), merge_sorted[lowest][1])
392
drawn_parents.add(merge_sorted[lowest][1])
393
elif len(revisions[revid].parent_ids) == 1:
394
# only one parent, must show this link to be useful.
395
parent_id = revisions[revid].parent_ids[0]
396
draw_line(h_idx, len(new_hanging), parent_id)
397
drawn_parents.add(parent_id)
399
# what do we want to draw lines to from here:
400
# each parent IF its relevant.
402
# Now we need to hang its parents, we put them at the point
403
# the old column was so anything to the right of this has
404
# to move outwards to make room. We also try and collapse
405
# hangs to keep the graph small.
406
# RBC: we do not draw lines to parents that were already merged
407
# unless its the last revision in a merge group.
408
for parent_id in revisions[revid].parent_ids:
409
if parent_id in drawn_parents:
411
parent_seq = revs[parent_id][0]
412
parent_depth = revs[parent_id][1]
413
if parent_depth == indent + 1:
414
# The parent was a merge into this branch determine if
415
# it was already merged into the mainline via a
416
# different merge: if all revisions between us and
417
# parent_seq have a indent greater than there are no
418
# revisions with a lower indent than us.
419
# We do not use 'parent_depth < indent' because that
420
# would allow un-uniqueified merges to show up, and
421
# merge_sorted should take care of that for us (but
422
# does not trim the values)
423
if parent_seq < next_lower_rev[revid]:
424
draw_line(h_idx, len(new_hanging), parent_id)
425
elif parent_depth == indent and parent_seq == seq + 1:
426
# part of this branch
427
draw_line(h_idx, len(new_hanging), parent_id)
429
# draw a line from the previous position of this line to the
431
# h_idx is the old position.
432
# new_indent is the new position.
433
draw_line(h_idx, len(new_hanging), hang)
434
# we've calculated the row, assign new_hanging to hanging to setup for
436
hanging = new_hanging
438
yield (revisions[revid], node, lines)
441
def same_branch(a, b):
442
"""Return whether we think revisions a and b are on the same branch."""
443
if len(a.parent_ids) == 1:
444
# Defacto same branch if only parent
446
elif a.committer == b.committer:
447
# Same committer so may as well be