55
class MergeHooks(hooks.Hooks):
58
hooks.Hooks.__init__(self)
59
self.create_hook(hooks.HookPoint('merge_file_content',
60
"Called with a bzrlib.merge.Merger object to create a per file "
61
"merge object when starting a merge. "
62
"Should return either None or a subclass of "
63
"``bzrlib.merge.AbstractPerFileMerger``. "
64
"Such objects will then be called per file "
65
"that needs to be merged (including when one "
66
"side has deleted the file and the other has changed it). "
67
"See the AbstractPerFileMerger API docs for details on how it is "
72
class AbstractPerFileMerger(object):
73
"""PerFileMerger objects are used by plugins extending merge for bzrlib.
75
See ``bzrlib.plugins.news_merge.news_merge`` for an example concrete class.
77
:ivar merger: The Merge3Merger performing the merge.
80
def __init__(self, merger):
81
"""Create a PerFileMerger for use with merger."""
84
def merge_contents(self, merge_params):
85
"""Attempt to merge the contents of a single file.
87
:param merge_params: A bzrlib.merge.MergeHookParams
88
:return : A tuple of (status, chunks), where status is one of
89
'not_applicable', 'success', 'conflicted', or 'delete'. If status
90
is 'success' or 'conflicted', then chunks should be an iterable of
91
strings for the new file contents.
93
return ('not applicable', None)
96
class ConfigurableFileMerger(AbstractPerFileMerger):
97
"""Merge individual files when configured via a .conf file.
99
This is a base class for concrete custom file merging logic. Concrete
100
classes should implement ``merge_text``.
102
:ivar affected_files: The configured file paths to merge.
103
:cvar name_prefix: The prefix to use when looking up configuration
105
:cvar default_files: The default file paths to merge when no configuration
112
def __init__(self, merger):
113
super(ConfigurableFileMerger, self).__init__(merger)
114
self.affected_files = None
115
self.default_files = self.__class__.default_files or []
116
self.name_prefix = self.__class__.name_prefix
117
if self.name_prefix is None:
118
raise ValueError("name_prefix must be set.")
120
def filename_matches_config(self, params):
121
affected_files = self.affected_files
122
if affected_files is None:
123
config = self.merger.this_tree.branch.get_config()
124
# Until bzr provides a better policy for caching the config, we
125
# just add the part we're interested in to the params to avoid
126
# reading the config files repeatedly (bazaar.conf, location.conf,
128
config_key = self.name_prefix + '_merge_files'
129
affected_files = config.get_user_option_as_list(config_key)
130
if affected_files is None:
131
# If nothing was specified in the config, use the default.
132
affected_files = self.default_files
133
self.affected_files = affected_files
135
filename = self.merger.this_tree.id2path(params.file_id)
136
if filename in affected_files:
140
def merge_contents(self, params):
141
"""Merge the contents of a single file."""
142
# First, check whether this custom merge logic should be used. We
143
# expect most files should not be merged by this handler.
145
# OTHER is a straight winner, rely on default merge.
146
params.winner == 'other' or
147
# THIS and OTHER aren't both files.
148
not params.is_file_merge() or
149
# The filename isn't listed in the 'NAME_merge_files' config
151
not self.filename_matches_config(params)):
152
return 'not_applicable', None
153
return self.merge_text(self, params)
155
def merge_text(self, params):
156
"""Merge the byte contents of a single file.
158
This is called after checking that the merge should be performed in
159
merge_contents, and it should behave as per
160
``bzrlib.merge.AbstractPerFileMerger.merge_contents``.
162
raise NotImplementedError(self.merge_text)
165
class MergeHookParams(object):
166
"""Object holding parameters passed to merge_file_content hooks.
168
There are some fields hooks can access:
170
:ivar file_id: the file ID of the file being merged
171
:ivar trans_id: the transform ID for the merge of this file
172
:ivar this_kind: kind of file_id in 'this' tree
173
:ivar other_kind: kind of file_id in 'other' tree
174
:ivar winner: one of 'this', 'other', 'conflict'
177
def __init__(self, merger, file_id, trans_id, this_kind, other_kind,
179
self._merger = merger
180
self.file_id = file_id
181
self.trans_id = trans_id
182
self.this_kind = this_kind
183
self.other_kind = other_kind
186
def is_file_merge(self):
187
"""True if this_kind and other_kind are both 'file'."""
188
return self.this_kind == 'file' and self.other_kind == 'file'
190
@decorators.cachedproperty
191
def base_lines(self):
192
"""The lines of the 'base' version of the file."""
193
return self._merger.get_lines(self._merger.base_tree, self.file_id)
195
@decorators.cachedproperty
196
def this_lines(self):
197
"""The lines of the 'this' version of the file."""
198
return self._merger.get_lines(self._merger.this_tree, self.file_id)
200
@decorators.cachedproperty
201
def other_lines(self):
202
"""The lines of the 'other' version of the file."""
203
return self._merger.get_lines(self._merger.other_tree, self.file_id)
53
206
class Merger(object):
54
210
def __init__(self, this_branch, other_tree=None, base_tree=None,
55
211
this_tree=None, pb=None, change_reporter=None,
56
212
recurse='down', revision_graph=None):
1140
1289
if winner == 'this':
1141
1290
# No interesting changes introduced by OTHER
1142
1291
return "unmodified"
1292
# We have a hypothetical conflict, but if we have files, then we
1293
# can try to merge the content
1143
1294
trans_id = self.tt.trans_id_file_id(file_id)
1144
if winner == 'other':
1295
params = MergeHookParams(self, file_id, trans_id, this_pair[0],
1296
other_pair[0], winner)
1297
hooks = self.active_hooks
1298
hook_status = 'not_applicable'
1300
hook_status, lines = hook.merge_contents(params)
1301
if hook_status != 'not_applicable':
1302
# Don't try any more hooks, this one applies.
1305
if hook_status == 'not_applicable':
1306
# This is a contents conflict, because none of the available
1307
# functions could merge it.
1309
name = self.tt.final_name(trans_id)
1310
parent_id = self.tt.final_parent(trans_id)
1311
if self.this_tree.has_id(file_id):
1312
self.tt.unversion_file(trans_id)
1313
file_group = self._dump_conflicts(name, parent_id, file_id,
1315
self._raw_conflicts.append(('contents conflict', file_group))
1316
elif hook_status == 'success':
1317
self.tt.create_file(lines, trans_id)
1318
elif hook_status == 'conflicted':
1319
# XXX: perhaps the hook should be able to provide
1320
# the BASE/THIS/OTHER files?
1321
self.tt.create_file(lines, trans_id)
1322
self._raw_conflicts.append(('text conflict', trans_id))
1323
name = self.tt.final_name(trans_id)
1324
parent_id = self.tt.final_parent(trans_id)
1325
self._dump_conflicts(name, parent_id, file_id)
1326
elif hook_status == 'delete':
1327
self.tt.unversion_file(trans_id)
1329
elif hook_status == 'done':
1330
# The hook function did whatever it needs to do directly, no
1331
# further action needed here.
1334
raise AssertionError('unknown hook_status: %r' % (hook_status,))
1335
if not self.this_tree.has_id(file_id) and result == "modified":
1336
self.tt.version_file(file_id, trans_id)
1337
# The merge has been performed, so the old contents should not be
1340
self.tt.delete_contents(trans_id)
1341
except errors.NoSuchFile:
1345
def _default_other_winner_merge(self, merge_hook_params):
1346
"""Replace this contents with other."""
1347
file_id = merge_hook_params.file_id
1348
trans_id = merge_hook_params.trans_id
1349
file_in_this = self.this_tree.has_id(file_id)
1350
if self.other_tree.has_id(file_id):
1351
# OTHER changed the file
1353
if wt.supports_content_filtering():
1354
# We get the path from the working tree if it exists.
1355
# That fails though when OTHER is adding a file, so
1356
# we fall back to the other tree to find the path if
1357
# it doesn't exist locally.
1359
filter_tree_path = wt.id2path(file_id)
1360
except errors.NoSuchId:
1361
filter_tree_path = self.other_tree.id2path(file_id)
1363
# Skip the id2path lookup for older formats
1364
filter_tree_path = None
1365
transform.create_from_tree(self.tt, trans_id,
1366
self.other_tree, file_id,
1367
filter_tree_path=filter_tree_path)
1370
# OTHER deleted the file
1371
return 'delete', None
1373
raise AssertionError(
1374
'winner is OTHER, but file_id %r not in THIS or OTHER tree'
1377
def merge_contents(self, merge_hook_params):
1378
"""Fallback merge logic after user installed hooks."""
1379
# This function is used in merge hooks as the fallback instance.
1380
# Perhaps making this function and the functions it calls be a
1381
# a separate class would be better.
1382
if merge_hook_params.winner == 'other':
1145
1383
# OTHER is a straight winner, so replace this contents with other
1146
file_in_this = file_id in self.this_tree
1148
# Remove any existing contents
1149
self.tt.delete_contents(trans_id)
1150
if file_id in self.other_tree:
1151
# OTHER changed the file
1153
if wt.supports_content_filtering():
1154
# We get the path from the working tree if it exists.
1155
# That fails though when OTHER is adding a file, so
1156
# we fall back to the other tree to find the path if
1157
# it doesn't exist locally.
1159
filter_tree_path = wt.id2path(file_id)
1160
except errors.NoSuchId:
1161
filter_tree_path = self.other_tree.id2path(file_id)
1163
# Skip the id2path lookup for older formats
1164
filter_tree_path = None
1165
transform.create_from_tree(self.tt, trans_id,
1166
self.other_tree, file_id,
1167
filter_tree_path=filter_tree_path)
1168
if not file_in_this:
1169
self.tt.version_file(file_id, trans_id)
1172
# OTHER deleted the file
1173
self.tt.unversion_file(trans_id)
1384
return self._default_other_winner_merge(merge_hook_params)
1385
elif merge_hook_params.is_file_merge():
1386
# THIS and OTHER are both files, so text merge. Either
1387
# BASE is a file, or both converted to files, so at least we
1388
# have agreement that output should be a file.
1390
self.text_merge(merge_hook_params.file_id,
1391
merge_hook_params.trans_id)
1392
except errors.BinaryFile:
1393
return 'not_applicable', None
1176
# We have a hypothetical conflict, but if we have files, then we
1177
# can try to merge the content
1178
if this_pair[0] == 'file' and other_pair[0] == 'file':
1179
# THIS and OTHER are both files, so text merge. Either
1180
# BASE is a file, or both converted to files, so at least we
1181
# have agreement that output should be a file.
1183
self.text_merge(file_id, trans_id)
1184
except errors.BinaryFile:
1185
return contents_conflict()
1186
if file_id not in self.this_tree:
1187
self.tt.version_file(file_id, trans_id)
1189
self.tt.tree_kind(trans_id)
1190
self.tt.delete_contents(trans_id)
1191
except errors.NoSuchFile:
1195
return contents_conflict()
1396
return 'not_applicable', None
1197
1398
def get_lines(self, tree, file_id):
1198
1399
"""Return the lines in a file, or an empty list."""
1400
if tree.has_id(file_id):
1200
1401
return tree.get_file(file_id).readlines()
added
removed
bzrlib/merge.py
