« back to all changes in this revision
Viewing changes to bzrlib/weave.py
- browse files at revision 1185.46.5
- compare with another revision
- download diff
- download tarball
- view history from revision 1185.46.5
- Committer: Aaron Bentley
- Date: 2005-12-12 17:14:42 UTC
- mto: (1185.60.3 Aaron's mergeable stuff)
- mto: This revision was merged to the branch mainline in revision 1530.
- Revision ID: abentley@panoramicfeedback.com-20051212171442-c5eeec64016bb1f7
Use unicode pathname in cmd_missing
- files added:
- HACKING
- bzrlib/export
- bzrlib/plugins
- bzrlib/store
- bzrlib/tests
- bzrlib/tests/blackbox
- bzrlib/transport
- bzrlib/ui
- bzrlib/util
- bzrlib/util/configobj
- bzrlib/util/configobj/docs
- bzrlib/util/effbot
- bzrlib/util/effbot/org
- contrib/emacs
- patches
- tools
- files removed:
- bzrlib/mdiff.py
- files renamed:
- bzrlib/store.py => bzrlib/store/__init__.py
- elementtree/ => bzrlib/util/elementtree/
- urlgrabber/ => bzrlib/util/urlgrabber/
- contrib/bash/bzr => contrib/bash/bzr.simple
- bzrlib/newinventory.py => contrib/newinventory.py
- files modified:
- .bzrignore
- bzr *
- setup.py *
added
removed
bzrlib/weave.py
1
#! /usr/bin/python
2
3
# Copyright (C) 2005 Canonical Ltd
4
5
# This program is free software; you can redistribute it and/or modify
6
# it under the terms of the GNU General Public License as published by
7
# the Free Software Foundation; either version 2 of the License, or
8
# (at your option) any later version.
9
10
# This program is distributed in the hope that it will be useful,
11
# but WITHOUT ANY WARRANTY; without even the implied warranty of
12
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13
# GNU General Public License for more details.
14
15
# You should have received a copy of the GNU General Public License
16
# along with this program; if not, write to the Free Software
17
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19
# Author: Martin Pool <mbp@canonical.com>
20
21
22
"""Weave - storage of related text file versions"""
23
24
25
# XXX: If we do weaves this way, will a merge still behave the same
26
# way if it's done in a different order? That's a pretty desirable
27
# property.
28
29
# TODO: Nothing here so far assumes the lines are really \n newlines,
30
# rather than being split up in some other way. We could accomodate
31
# binaries, perhaps by naively splitting on \n or perhaps using
32
# something like a rolling checksum.
33
34
# TODO: End marker for each version so we can stop reading?
35
36
# TODO: Check that no insertion occurs inside a deletion that was
37
# active in the version of the insertion.
38
39
# TODO: In addition to the SHA-1 check, perhaps have some code that
40
# checks structural constraints of the weave: ie that insertions are
41
# properly nested, that there is no text outside of an insertion, that
42
# insertions or deletions are not repeated, etc.
43
44
# TODO: Parallel-extract that passes back each line along with a
45
# description of which revisions include it. Nice for checking all
46
# shas or calculating stats in parallel.
47
48
# TODO: Using a single _extract routine and then processing the output
49
# is probably inefficient. It's simple enough that we can afford to
50
# have slight specializations for different ways its used: annotate,
51
# basis for add, get, etc.
52
53
# TODO: Probably the API should work only in names to hide the integer
54
# indexes from the user.
55
56
# TODO: Is there any potential performance win by having an add()
57
# variant that is passed a pre-cooked version of the single basis
58
# version?
59
60
# TODO: Reweave can possibly be made faster by remembering diffs
61
# where the basis and destination are unchanged.
62
63
# FIXME: Sometimes we will be given a parents list for a revision
64
# that includes some redundant parents (i.e. already a parent of
65
# something in the list.) We should eliminate them. This can
66
# be done fairly efficiently because the sequence numbers constrain
67
# the possible relationships.
68
69
70
import sha
71
from difflib import SequenceMatcher
72
73
from bzrlib.trace import mutter
74
from bzrlib.errors import WeaveError, WeaveFormatError, WeaveParentMismatch, \
75
WeaveRevisionNotPresent, WeaveRevisionAlreadyPresent
76
from bzrlib.tsort import topo_sort
77
78
79
class Weave(object):
80
"""weave - versioned text file storage.
81
82
A Weave manages versions of line-based text files, keeping track
83
of the originating version for each line.
84
85
To clients the "lines" of the file are represented as a list of strings.
86
These strings will typically have terminal newline characters, but
87
this is not required. In particular files commonly do not have a newline
88
at the end of the file.
89
90
Texts can be identified in either of two ways:
91
92
* a nonnegative index number.
93
94
* a version-id string.
95
96
Typically the index number will be valid only inside this weave and
97
the version-id is used to reference it in the larger world.
98
99
The weave is represented as a list mixing edit instructions and
100
literal text. Each entry in _weave can be either a string (or
101
unicode), or a tuple. If a string, it means that the given line
102
should be output in the currently active revisions.
103
104
If a tuple, it gives a processing instruction saying in which
105
revisions the enclosed lines are active. The tuple has the form
106
(instruction, version).
107
108
The instruction can be '{' or '}' for an insertion block, and '['
109
and ']' for a deletion block respectively. The version is the
110
integer version index. There is no replace operator, only deletes
111
and inserts. For '}', the end of an insertion, there is no
112
version parameter because it always closes the most recently
113
opened insertion.
114
115
Constraints/notes:
116
117
* A later version can delete lines that were introduced by any
118
number of ancestor versions; this implies that deletion
119
instructions can span insertion blocks without regard to the
120
insertion block's nesting.
121
122
* Similarly, deletions need not be properly nested with regard to
123
each other, because they might have been generated by
124
independent revisions.
125
126
* Insertions are always made by inserting a new bracketed block
127
into a single point in the previous weave. This implies they
128
can nest but not overlap, and the nesting must always have later
129
insertions on the inside.
130
131
* It doesn't seem very useful to have an active insertion
132
inside an inactive insertion, but it might happen.
133
134
* Therefore, all instructions are always"considered"; that
135
is passed onto and off the stack. An outer inactive block
136
doesn't disable an inner block.
137
138
* Lines are enabled if the most recent enclosing insertion is
139
active and none of the enclosing deletions are active.
140
141
* There is no point having a deletion directly inside its own
142
insertion; you might as well just not write it. And there
143
should be no way to get an earlier version deleting a later
144
version.
145
146
_weave
147
Text of the weave; list of control instruction tuples and strings.
148
149
_parents
150
List of parents, indexed by version number.
151
It is only necessary to store the minimal set of parents for
152
each version; the parent's parents are implied.
153
154
_sha1s
155
List of hex SHA-1 of each version.
156
157
_names
158
List of symbolic names for each version. Each should be unique.
159
160
_name_map
161
For each name, the version number.
162
163
_weave_name
164
Descriptive name of this weave; typically the filename if known.
165
Set by read_weave.
166
"""
167
168
__slots__ = ['_weave', '_parents', '_sha1s', '_names', '_name_map',
169
'_weave_name']
170
171
def __init__(self, weave_name=None):
172
self._weave = []
173
self._parents = []
174
self._sha1s = []
175
self._names = []
176
self._name_map = {}
177
self._weave_name = weave_name
178
179
def __repr__(self):
180
return "Weave(%r)" % self._weave_name
181
182
183
def copy(self):
184
"""Return a deep copy of self.
185
186
The copy can be modified without affecting the original weave."""
187
other = Weave()
188
other._weave = self._weave[:]
189
other._parents = self._parents[:]
190
other._sha1s = self._sha1s[:]
191
other._names = self._names[:]
192
other._name_map = self._name_map.copy()
193
other._weave_name = self._weave_name
194
return other
195
196
def __eq__(self, other):
197
if not isinstance(other, Weave):
198
return False
199
return self._parents == other._parents \
200
and self._weave == other._weave \
201
and self._sha1s == other._sha1s
202
203
204
def __ne__(self, other):
205
return not self.__eq__(other)
206
207
def __contains__(self, name):
208
return self._name_map.has_key(name)
209
210
def maybe_lookup(self, name_or_index):
211
"""Convert possible symbolic name to index, or pass through indexes."""
212
if isinstance(name_or_index, (int, long)):
213
return name_or_index
214
else:
215
return self.lookup(name_or_index)
216
217
218
def lookup(self, name):
219
"""Convert symbolic version name to index."""
220
try:
221
return self._name_map[name]
222
except KeyError:
223
raise WeaveRevisionNotPresent(name, self)
224
225
def names(self):
226
return self._names[:]
227
228
def iter_names(self):
229
"""Yield a list of all names in this weave."""
230
return iter(self._names)
231
232
def idx_to_name(self, version):
233
return self._names[version]
234
235
def _check_repeated_add(self, name, parents, text, sha1):
236
"""Check that a duplicated add is OK.
237
238
If it is, return the (old) index; otherwise raise an exception.
239
"""
240
idx = self.lookup(name)
241
if sorted(self._parents[idx]) != sorted(parents) \
242
or sha1 != self._sha1s[idx]:
243
raise WeaveRevisionAlreadyPresent(name, self)
244
return idx
245
246
def add(self, name, parents, text, sha1=None):
247
"""Add a single text on top of the weave.
248
249
Returns the index number of the newly added version.
250
251
name
252
Symbolic name for this version.
253
(Typically the revision-id of the revision that added it.)
254
255
parents
256
List or set of direct parent version numbers.
257
258
text
259
Sequence of lines to be added in the new version.
260
261
sha -- SHA-1 of the file, if known. This is trusted to be
262
correct if supplied.
263
"""
264
from bzrlib.osutils import sha_strings
265
266
assert isinstance(name, basestring)
267
if sha1 is None:
268
sha1 = sha_strings(text)
269
if name in self._name_map:
270
return self._check_repeated_add(name, parents, text, sha1)
271
272
parents = map(self.maybe_lookup, parents)
273
self._check_versions(parents)
274
## self._check_lines(text)
275
new_version = len(self._parents)
276
277
278
# if we abort after here the (in-memory) weave will be corrupt because only
279
# some fields are updated
280
self._parents.append(parents[:])
281
self._sha1s.append(sha1)
282
self._names.append(name)
283
self._name_map[name] = new_version
284
285
286
if not parents:
287
# special case; adding with no parents revision; can do
288
# this more quickly by just appending unconditionally.
289
# even more specially, if we're adding an empty text we
290
# need do nothing at all.
291
if text:
292
self._weave.append(('{', new_version))
293
self._weave.extend(text)
294
self._weave.append(('}', None))
295
296
return new_version
297
298
if len(parents) == 1:
299
pv = list(parents)[0]
300
if sha1 == self._sha1s[pv]:
301
# special case: same as the single parent
302
return new_version
303
304
305
ancestors = self.inclusions(parents)
306
307
l = self._weave
308
309
# basis a list of (origin, lineno, line)
310
basis_lineno = []
311
basis_lines = []
312
for origin, lineno, line in self._extract(ancestors):
313
basis_lineno.append(lineno)
314
basis_lines.append(line)
315
316
# another small special case: a merge, producing the same text
317
# as auto-merge
318
if text == basis_lines:
319
return new_version
320
321
# add a sentinal, because we can also match against the final line
322
basis_lineno.append(len(self._weave))
323
324
# XXX: which line of the weave should we really consider
325
# matches the end of the file? the current code says it's the
326
# last line of the weave?
327
328
#print 'basis_lines:', basis_lines
329
#print 'new_lines: ', lines
330
331
s = SequenceMatcher(None, basis_lines, text)
332
333
# offset gives the number of lines that have been inserted
334
# into the weave up to the current point; if the original edit instruction
335
# says to change line A then we actually change (A+offset)
336
offset = 0
337
338
for tag, i1, i2, j1, j2 in s.get_opcodes():
339
# i1,i2 are given in offsets within basis_lines; we need to map them
340
# back to offsets within the entire weave
341
#print 'raw match', tag, i1, i2, j1, j2
342
if tag == 'equal':
343
continue
344
345
i1 = basis_lineno[i1]
346
i2 = basis_lineno[i2]
347
348
assert 0 <= j1 <= j2 <= len(text)
349
350
#print tag, i1, i2, j1, j2
351
352
# the deletion and insertion are handled separately.
353
# first delete the region.
354
if i1 != i2:
355
self._weave.insert(i1+offset, ('[', new_version))
356
self._weave.insert(i2+offset+1, (']', new_version))
357
offset += 2
358
359
if j1 != j2:
360
# there may have been a deletion spanning up to
361
# i2; we want to insert after this region to make sure
362
# we don't destroy ourselves
363
i = i2 + offset
364
self._weave[i:i] = ([('{', new_version)]
365
+ text[j1:j2]
366
+ [('}', None)])
367
offset += 2 + (j2 - j1)
368
369
return new_version
370
371
def add_identical(self, old_rev_id, new_rev_id, parents):
372
"""Add an identical text to old_rev_id as new_rev_id."""
373
old_lines = self.get(self.lookup(old_rev_id))
374
self.add(new_rev_id, parents, old_lines)
375
376
def inclusions(self, versions):
377
"""Return set of all ancestors of given version(s)."""
378
i = set(versions)
379
for v in xrange(max(versions), 0, -1):
380
if v in i:
381
# include all its parents
382
i.update(self._parents[v])
383
return i
384
## except IndexError:
385
## raise ValueError("version %d not present in weave" % v)
386
387
388
def parents(self, version):
389
return self._parents[version]
390
391
392
def parent_names(self, version):
393
"""Return version names for parents of a version."""
394
return map(self.idx_to_name, self._parents[self.lookup(version)])
395
396
397
def minimal_parents(self, version):
398
"""Find the minimal set of parents for the version."""
399
included = self._parents[version]
400
if not included:
401
return []
402
403
li = list(included)
404
li.sort(reverse=True)
405
406
mininc = []
407
gotit = set()
408
409
for pv in li:
410
if pv not in gotit:
411
mininc.append(pv)
412
gotit.update(self.inclusions(pv))
413
414
assert mininc[0] >= 0
415
assert mininc[-1] < version
416
return mininc
417
418
419
420
def _check_lines(self, text):
421
if not isinstance(text, list):
422
raise ValueError("text should be a list, not %s" % type(text))
423
424
for l in text:
425
if not isinstance(l, basestring):
426
raise ValueError("text line should be a string or unicode, not %s"
427
% type(l))
428
429
430
431
def _check_versions(self, indexes):
432
"""Check everything in the sequence of indexes is valid"""
433
for i in indexes:
434
try:
435
self._parents[i]
436
except IndexError:
437
raise IndexError("invalid version number %r" % i)
438
439
440
def annotate(self, name_or_index):
441
return list(self.annotate_iter(name_or_index))
442
443
444
def annotate_iter(self, name_or_index):
445
"""Yield list of (index-id, line) pairs for the specified version.
446
447
The index indicates when the line originated in the weave."""
448
incls = [self.maybe_lookup(name_or_index)]
449
for origin, lineno, text in self._extract(incls):
450
yield origin, text
451
452
def _walk(self):
453
"""Walk the weave.
454
455
Yields sequence of
456
(lineno, insert, deletes, text)
457
for each literal line.
458
"""
459
460
istack = []
461
dset = set()
462
463
lineno = 0 # line of weave, 0-based
464
465
for l in self._weave:
466
if isinstance(l, tuple):
467
c, v = l
468
isactive = None
469
if c == '{':
470
istack.append(v)
471
elif c == '}':
472
istack.pop()
473
elif c == '[':
474
assert v not in dset
475
dset.add(v)
476
elif c == ']':
477
dset.remove(v)
478
else:
479
raise WeaveFormatError('unexpected instruction %r' % v)
480
else:
481
assert isinstance(l, basestring)
482
assert istack
483
yield lineno, istack[-1], dset, l
484
lineno += 1
485
486
487
488
def _extract(self, versions):
489
"""Yield annotation of lines in included set.
490
491
Yields a sequence of tuples (origin, lineno, text), where
492
origin is the origin version, lineno the index in the weave,
493
and text the text of the line.
494
495
The set typically but not necessarily corresponds to a version.
496
"""
497
for i in versions:
498
if not isinstance(i, int):
499
raise ValueError(i)
500
501
included = self.inclusions(versions)
502
503
istack = []
504
dset = set()
505
506
lineno = 0 # line of weave, 0-based
507
508
isactive = None
509
510
result = []
511
512
WFE = WeaveFormatError
513
514
for l in self._weave:
515
if isinstance(l, tuple):
516
c, v = l
517
isactive = None
518
if c == '{':
519
assert v not in istack
520
istack.append(v)
521
elif c == '}':
522
istack.pop()
523
elif c == '[':
524
if v in included:
525
assert v not in dset
526
dset.add(v)
527
else:
528
assert c == ']'
529
if v in included:
530
assert v in dset
531
dset.remove(v)
532
else:
533
assert isinstance(l, basestring)
534
if isactive is None:
535
isactive = (not dset) and istack and (istack[-1] in included)
536
if isactive:
537
result.append((istack[-1], lineno, l))
538
lineno += 1
539
if istack:
540
raise WeaveFormatError("unclosed insertion blocks "
541
"at end of weave: %s" % istack)
542
if dset:
543
raise WeaveFormatError("unclosed deletion blocks at end of weave: %s"
544
% dset)
545
return result
546
547
548
def get_iter(self, name_or_index):
549
"""Yield lines for the specified version."""
550
incls = [self.maybe_lookup(name_or_index)]
551
for origin, lineno, line in self._extract(incls):
552
yield line
553
554
555
def get_text(self, name_or_index):
556
return ''.join(self.get_iter(name_or_index))
557
assert isinstance(version, int)
558
559
560
def get_lines(self, name_or_index):
561
return list(self.get_iter(name_or_index))
562
563
564
get = get_lines
565
566
567
def mash_iter(self, included):
568
"""Return composed version of multiple included versions."""
569
included = map(self.maybe_lookup, included)
570
for origin, lineno, text in self._extract(included):
571
yield text
572
573
574
def dump(self, to_file):
575
from pprint import pprint
576
print >>to_file, "Weave._weave = ",
577
pprint(self._weave, to_file)
578
print >>to_file, "Weave._parents = ",
579
pprint(self._parents, to_file)
580
581
582
583
def numversions(self):
584
l = len(self._parents)
585
assert l == len(self._sha1s)
586
return l
587
588
589
def __len__(self):
590
return self.numversions()
591
592
593
def check(self, progress_bar=None):
594
# check no circular inclusions
595
for version in range(self.numversions()):
596
inclusions = list(self._parents[version])
597
if inclusions:
598
inclusions.sort()
599
if inclusions[-1] >= version:
600
raise WeaveFormatError("invalid included version %d for index %d"
601
% (inclusions[-1], version))
602
603
# try extracting all versions; this is a bit slow and parallel
604
# extraction could be used
605
nv = self.numversions()
606
for version in range(nv):
607
if progress_bar:
608
progress_bar.update('checking text', version, nv)
609
s = sha.new()
610
for l in self.get_iter(version):
611
s.update(l)
612
hd = s.hexdigest()
613
expected = self._sha1s[version]
614
if hd != expected:
615
raise WeaveError("mismatched sha1 for version %d; "
616
"got %s, expected %s"
617
% (version, hd, expected))
618
619
# TODO: check insertions are properly nested, that there are
620
# no lines outside of insertion blocks, that deletions are
621
# properly paired, etc.
622
623
624
def _delta(self, included, lines):
625
"""Return changes from basis to new revision.
626
627
The old text for comparison is the union of included revisions.
628
629
This is used in inserting a new text.
630
631
Delta is returned as a sequence of
632
(weave1, weave2, newlines).
633
634
This indicates that weave1:weave2 of the old weave should be
635
replaced by the sequence of lines in newlines. Note that
636
these line numbers are positions in the total weave and don't
637
correspond to the lines in any extracted version, or even the
638
extracted union of included versions.
639
640
If line1=line2, this is a pure insert; if newlines=[] this is a
641
pure delete. (Similar to difflib.)
642
"""
643
raise NotImplementedError()
644
645
646
def plan_merge(self, ver_a, ver_b):
647
"""Return pseudo-annotation indicating how the two versions merge.
648
649
This is computed between versions a and b and their common
650
base.
651
652
Weave lines present in none of them are skipped entirely.
653
"""
654
inc_a = self.inclusions([ver_a])
655
inc_b = self.inclusions([ver_b])
656
inc_c = inc_a & inc_b
657
658
for lineno, insert, deleteset, line in self._walk():
659
if deleteset & inc_c:
660
# killed in parent; can't be in either a or b
661
# not relevant to our work
662
yield 'killed-base', line
663
elif insert in inc_c:
664
# was inserted in base
665
killed_a = bool(deleteset & inc_a)
666
killed_b = bool(deleteset & inc_b)
667
if killed_a and killed_b:
668
yield 'killed-both', line
669
elif killed_a:
670
yield 'killed-a', line
671
elif killed_b:
672
yield 'killed-b', line
673
else:
674
yield 'unchanged', line
675
elif insert in inc_a:
676
if deleteset & inc_a:
677
yield 'ghost-a', line
678
else:
679
# new in A; not in B
680
yield 'new-a', line
681
elif insert in inc_b:
682
if deleteset & inc_b:
683
yield 'ghost-b', line
684
else:
685
yield 'new-b', line
686
else:
687
# not in either revision
688
yield 'irrelevant', line
689
690
yield 'unchanged', '' # terminator
691
692
693
694
def weave_merge(self, plan):
695
lines_a = []
696
lines_b = []
697
ch_a = ch_b = False
698
699
for state, line in plan:
700
if state == 'unchanged' or state == 'killed-both':
701
# resync and flush queued conflicts changes if any
702
if not lines_a and not lines_b:
703
pass
704
elif ch_a and not ch_b:
705
# one-sided change:
706
for l in lines_a: yield l
707
elif ch_b and not ch_a:
708
for l in lines_b: yield l
709
elif lines_a == lines_b:
710
for l in lines_a: yield l
711
else:
712
yield '<<<<<<<\n'
713
for l in lines_a: yield l
714
yield '=======\n'
715
for l in lines_b: yield l
716
yield '>>>>>>>\n'
717
718
del lines_a[:]
719
del lines_b[:]
720
ch_a = ch_b = False
721
722
if state == 'unchanged':
723
if line:
724
yield line
725
elif state == 'killed-a':
726
ch_a = True
727
lines_b.append(line)
728
elif state == 'killed-b':
729
ch_b = True
730
lines_a.append(line)
731
elif state == 'new-a':
732
ch_a = True
733
lines_a.append(line)
734
elif state == 'new-b':
735
ch_b = True
736
lines_b.append(line)
737
else:
738
assert state in ('irrelevant', 'ghost-a', 'ghost-b', 'killed-base',
739
'killed-both'), \
740
state
741
742
743
def join(self, other):
744
"""Integrate versions from other into this weave.
745
746
The resulting weave contains all the history of both weaves;
747
any version you could retrieve from either self or other can be
748
retrieved from self after this call.
749
750
It is illegal for the two weaves to contain different values
751
or different parents for any version. See also reweave().
752
"""
753
if other.numversions() == 0:
754
return # nothing to update, easy
755
# two loops so that we do not change ourselves before verifying it
756
# will be ok
757
# work through in index order to make sure we get all dependencies
758
for other_idx, name in enumerate(other._names):
759
if self._check_version_consistent(other, other_idx, name):
760
continue
761
for other_idx, name in enumerate(other._names):
762
# TODO: If all the parents of the other version are already
763
# present then we can avoid some work by just taking the delta
764
# and adjusting the offsets.
765
new_parents = self._imported_parents(other, other_idx)
766
lines = other.get_lines(other_idx)
767
sha1 = other._sha1s[other_idx]
768
self.add(name, new_parents, lines, sha1)
769
770
771
def _imported_parents(self, other, other_idx):
772
"""Return list of parents in self corresponding to indexes in other."""
773
new_parents = []
774
for parent_idx in other._parents[other_idx]:
775
parent_name = other._names[parent_idx]
776
if parent_name not in self._names:
777
# should not be possible
778
raise WeaveError("missing parent {%s} of {%s} in %r"
779
% (parent_name, other._name_map[other_idx], self))
780
new_parents.append(self._name_map[parent_name])
781
return new_parents
782
783
def _check_version_consistent(self, other, other_idx, name):
784
"""Check if a version in consistent in this and other.
785
786
To be consistent it must have:
787
788
* the same text
789
* the same direct parents (by name, not index, and disregarding
790
order)
791
792
If present & correct return True;
793
if not present in self return False;
794
if inconsistent raise error."""
795
this_idx = self._name_map.get(name, -1)
796
if this_idx != -1:
797
if self._sha1s[this_idx] != other._sha1s[other_idx]:
798
raise WeaveError("inconsistent texts for version {%s} "
799
"when joining weaves"
800
% (name))
801
self_parents = self._parents[this_idx]
802
other_parents = other._parents[other_idx]
803
n1 = [self._names[i] for i in self_parents]
804
n2 = [other._names[i] for i in other_parents]
805
n1.sort()
806
n2.sort()
807
if n1 != n2:
808
raise WeaveParentMismatch("inconsistent parents "
809
"for version {%s}: %s vs %s" % (name, n1, n2))
810
else:
811
return True # ok!
812
else:
813
return False
814
815
def reweave(self, other):
816
"""Reweave self with other."""
817
new_weave = reweave(self, other)
818
for attr in self.__slots__:
819
setattr(self, attr, getattr(new_weave, attr))
820
821
822
def reweave(wa, wb):
823
"""Combine two weaves and return the result.
824
825
This works even if a revision R has different parents in
826
wa and wb. In the resulting weave all the parents are given.
827
828
This is done by just building up a new weave, maintaining ordering
829
of the versions in the two inputs. More efficient approaches
830
might be possible but it should only be necessary to do
831
this operation rarely, when a new previously ghost version is
832
inserted.
833
"""
834
wr = Weave()
835
ia = ib = 0
836
queue_a = range(wa.numversions())
837
queue_b = range(wb.numversions())
838
# first determine combined parents of all versions
839
# map from version name -> all parent names
840
combined_parents = _reweave_parent_graphs(wa, wb)
841
mutter("combined parents: %r", combined_parents)
842
order = topo_sort(combined_parents.iteritems())
843
mutter("order to reweave: %r", order)
844
for name in order:
845
if name in wa._name_map:
846
lines = wa.get_lines(name)
847
if name in wb._name_map:
848
assert lines == wb.get_lines(name)
849
else:
850
lines = wb.get_lines(name)
851
wr.add(name, combined_parents[name], lines)
852
return wr
853
854
855
def _reweave_parent_graphs(wa, wb):
856
"""Return combined parent ancestry for two weaves.
857
858
Returned as a list of (version_name, set(parent_names))"""
859
combined = {}
860
for weave in [wa, wb]:
861
for idx, name in enumerate(weave._names):
862
p = combined.setdefault(name, set())
863
p.update(map(weave.idx_to_name, weave._parents[idx]))
864
return combined
865
866
867
def weave_toc(w):
868
"""Show the weave's table-of-contents"""
869
print '%6s %50s %10s %10s' % ('ver', 'name', 'sha1', 'parents')
870
for i in (6, 50, 10, 10):
871
print '-' * i,
872
print
873
for i in range(w.numversions()):
874
sha1 = w._sha1s[i]
875
name = w._names[i]
876
parent_str = ' '.join(map(str, w._parents[i]))
877
print '%6d %-50.50s %10.10s %s' % (i, name, sha1, parent_str)
878
879
880
881
def weave_stats(weave_file, pb):
882
from bzrlib.weavefile import read_weave
883
884
wf = file(weave_file, 'rb')
885
w = read_weave(wf)
886
# FIXME: doesn't work on pipes
887
weave_size = wf.tell()
888
889
total = 0
890
vers = len(w)
891
for i in range(vers):
892
pb.update('checking sizes', i, vers)
893
for origin, lineno, line in w._extract([i]):
894
total += len(line)
895
896
pb.clear()
897
898
print 'versions %9d' % vers
899
print 'weave file %9d bytes' % weave_size
900
print 'total contents %9d bytes' % total
901
print 'compression ratio %9.2fx' % (float(total) / float(weave_size))
902
if vers:
903
avg = total/vers
904
print 'average size %9d bytes' % avg
905
print 'relative size %9.2fx' % (float(weave_size) / float(avg))
906
907
908
def usage():
909
print """bzr weave tool
910
911
Experimental tool for weave algorithm.
912
913
usage:
914
weave init WEAVEFILE
915
Create an empty weave file
916
weave get WEAVEFILE VERSION
917
Write out specified version.
918
weave check WEAVEFILE
919
Check consistency of all versions.
920
weave toc WEAVEFILE
921
Display table of contents.
922
weave add WEAVEFILE NAME [BASE...] < NEWTEXT
923
Add NEWTEXT, with specified parent versions.
924
weave annotate WEAVEFILE VERSION
925
Display origin of each line.
926
weave mash WEAVEFILE VERSION...
927
Display composite of all selected versions.
928
weave merge WEAVEFILE VERSION1 VERSION2 > OUT
929
Auto-merge two versions and display conflicts.
930
weave diff WEAVEFILE VERSION1 VERSION2
931
Show differences between two versions.
932
933
example:
934
935
% weave init foo.weave
936
% vi foo.txt
937
% weave add foo.weave ver0 < foo.txt
938
added version 0
939
940
(create updated version)
941
% vi foo.txt
942
% weave get foo.weave 0 | diff -u - foo.txt
943
% weave add foo.weave ver1 0 < foo.txt
944
added version 1
945
946
% weave get foo.weave 0 > foo.txt (create forked version)
947
% vi foo.txt
948
% weave add foo.weave ver2 0 < foo.txt
949
added version 2
950
951
% weave merge foo.weave 1 2 > foo.txt (merge them)
952
% vi foo.txt (resolve conflicts)
953
% weave add foo.weave merged 1 2 < foo.txt (commit merged version)
954
955
"""
956
957
958
959
def main(argv):
960
import sys
961
import os
962
try:
963
import bzrlib
964
except ImportError:
965
# in case we're run directly from the subdirectory
966
sys.path.append('..')
967
import bzrlib
968
from bzrlib.weavefile import write_weave, read_weave
969
from bzrlib.progress import ProgressBar
970
971
try:
972
import psyco
973
psyco.full()
974
except ImportError:
975
pass
976
977
if len(argv) < 2:
978
usage()
979
return 0
980
981
cmd = argv[1]
982
983
def readit():
984
return read_weave(file(argv[2], 'rb'))
985
986
if cmd == 'help':
987
usage()
988
elif cmd == 'add':
989
w = readit()
990
# at the moment, based on everything in the file
991
name = argv[3]
992
parents = map(int, argv[4:])
993
lines = sys.stdin.readlines()
994
ver = w.add(name, parents, lines)
995
write_weave(w, file(argv[2], 'wb'))
996
print 'added version %r %d' % (name, ver)
997
elif cmd == 'init':
998
fn = argv[2]
999
if os.path.exists(fn):
1000
raise IOError("file exists")
1001
w = Weave()
1002
write_weave(w, file(fn, 'wb'))
1003
elif cmd == 'get': # get one version
1004
w = readit()
1005
sys.stdout.writelines(w.get_iter(int(argv[3])))
1006
1007
elif cmd == 'mash': # get composite
1008
w = readit()
1009
sys.stdout.writelines(w.mash_iter(map(int, argv[3:])))
1010
1011
elif cmd == 'diff':
1012
from difflib import unified_diff
1013
w = readit()
1014
fn = argv[2]
1015
v1, v2 = map(int, argv[3:5])
1016
lines1 = w.get(v1)
1017
lines2 = w.get(v2)
1018
diff_gen = unified_diff(lines1, lines2,
1019
'%s version %d' % (fn, v1),
1020
'%s version %d' % (fn, v2))
1021
sys.stdout.writelines(diff_gen)
1022
1023
elif cmd == 'annotate':
1024
w = readit()
1025
# newline is added to all lines regardless; too hard to get
1026
# reasonable formatting otherwise
1027
lasto = None
1028
for origin, text in w.annotate(int(argv[3])):
1029
text = text.rstrip('\r\n')
1030
if origin == lasto:
1031
print ' | %s' % (text)
1032
else:
1033
print '%5d | %s' % (origin, text)
1034
lasto = origin
1035
1036
elif cmd == 'toc':
1037
weave_toc(readit())
1038
1039
elif cmd == 'stats':
1040
weave_stats(argv[2], ProgressBar())
1041
1042
elif cmd == 'check':
1043
w = readit()
1044
pb = ProgressBar()
1045
w.check(pb)
1046
pb.clear()
1047
print '%d versions ok' % w.numversions()
1048
1049
elif cmd == 'inclusions':
1050
w = readit()
1051
print ' '.join(map(str, w.inclusions([int(argv[3])])))
1052
1053
elif cmd == 'parents':
1054
w = readit()
1055
print ' '.join(map(str, w._parents[int(argv[3])]))
1056
1057
elif cmd == 'plan-merge':
1058
w = readit()
1059
for state, line in w.plan_merge(int(argv[3]), int(argv[4])):
1060
if line:
1061
print '%14s | %s' % (state, line),
1062
1063
elif cmd == 'merge':
1064
w = readit()
1065
p = w.plan_merge(int(argv[3]), int(argv[4]))
1066
sys.stdout.writelines(w.weave_merge(p))
1067
1068
elif cmd == 'mash-merge':
1069
if len(argv) != 5:
1070
usage()
1071
return 1
1072
1073
w = readit()
1074
v1, v2 = map(int, argv[3:5])
1075
1076
basis = w.inclusions([v1]).intersection(w.inclusions([v2]))
1077
1078
base_lines = list(w.mash_iter(basis))
1079
a_lines = list(w.get(v1))
1080
b_lines = list(w.get(v2))
1081
1082
from bzrlib.merge3 import Merge3
1083
m3 = Merge3(base_lines, a_lines, b_lines)
1084
1085
name_a = 'version %d' % v1
1086
name_b = 'version %d' % v2
1087
sys.stdout.writelines(m3.merge_lines(name_a=name_a, name_b=name_b))
1088
else:
1089
raise ValueError('unknown command %r' % cmd)
1090
1091
1092
1093
def profile_main(argv):
1094
import tempfile, hotshot, hotshot.stats
1095
1096
prof_f = tempfile.NamedTemporaryFile()
1097
1098
prof = hotshot.Profile(prof_f.name)
1099
1100
ret = prof.runcall(main, argv)
1101
prof.close()
1102
1103
stats = hotshot.stats.load(prof_f.name)
1104
#stats.strip_dirs()
1105
stats.sort_stats('cumulative')
1106
## XXX: Might like to write to stderr or the trace file instead but
1107
## print_stats seems hardcoded to stdout
1108
stats.print_stats(20)
1109
1110
return ret
1111
1112
1113
if __name__ == '__main__':
1114
import sys
1115
if '--profile' in sys.argv:
1116
args = sys.argv[:]
1117
args.remove('--profile')
1118
sys.exit(profile_main(args))
1119
else:
1120
sys.exit(main(sys.argv))
1121
Loggerhead is a web-based interface for Breezy
Version: 2.0.1