|
|
# Copyright (C) 2004, 2005 Canonical Ltd
|
|
|
#
|
|
|
# This program is free software; you can redistribute it and/or modify
|
|
|
# it under the terms of the GNU General Public License as published by
|
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
|
# (at your option) any later version.
|
|
|
#
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
# GNU General Public License for more details.
|
|
|
#
|
|
|
# You should have received a copy of the GNU General Public License
|
|
|
# along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
# mbp: "you know that thing where cvs gives you conflict markers?"
|
|
|
# s: "i hate that."
|
|
|
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
from .i18n import _
|
|
|
from . import (
|
|
|
error,
|
|
|
mdiff,
|
|
|
pycompat,
|
|
|
util,
|
|
|
)
|
|
|
|
|
|
class CantReprocessAndShowBase(Exception):
|
|
|
pass
|
|
|
|
|
|
def intersect(ra, rb):
|
|
|
"""Given two ranges return the range where they intersect or None.
|
|
|
|
|
|
>>> intersect((0, 10), (0, 6))
|
|
|
(0, 6)
|
|
|
>>> intersect((0, 10), (5, 15))
|
|
|
(5, 10)
|
|
|
>>> intersect((0, 10), (10, 15))
|
|
|
>>> intersect((0, 9), (10, 15))
|
|
|
>>> intersect((0, 9), (7, 15))
|
|
|
(7, 9)
|
|
|
"""
|
|
|
assert ra[0] <= ra[1]
|
|
|
assert rb[0] <= rb[1]
|
|
|
|
|
|
sa = max(ra[0], rb[0])
|
|
|
sb = min(ra[1], rb[1])
|
|
|
if sa < sb:
|
|
|
return sa, sb
|
|
|
else:
|
|
|
return None
|
|
|
|
|
|
def compare_range(a, astart, aend, b, bstart, bend):
|
|
|
"""Compare a[astart:aend] == b[bstart:bend], without slicing.
|
|
|
"""
|
|
|
if (aend - astart) != (bend - bstart):
|
|
|
return False
|
|
|
for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)):
|
|
|
if a[ia] != b[ib]:
|
|
|
return False
|
|
|
else:
|
|
|
return True
|
|
|
|
|
|
class Merge3Text(object):
|
|
|
"""3-way merge of texts.
|
|
|
|
|
|
Given strings BASE, OTHER, THIS, tries to produce a combined text
|
|
|
incorporating the changes from both BASE->OTHER and BASE->THIS."""
|
|
|
def __init__(self, basetext, atext, btext, base=None, a=None, b=None):
|
|
|
self.basetext = basetext
|
|
|
self.atext = atext
|
|
|
self.btext = btext
|
|
|
if base is None:
|
|
|
base = mdiff.splitnewlines(basetext)
|
|
|
if a is None:
|
|
|
a = mdiff.splitnewlines(atext)
|
|
|
if b is None:
|
|
|
b = mdiff.splitnewlines(btext)
|
|
|
self.base = base
|
|
|
self.a = a
|
|
|
self.b = b
|
|
|
|
|
|
def merge_lines(self,
|
|
|
name_a=None,
|
|
|
name_b=None,
|
|
|
name_base=None,
|
|
|
start_marker='<<<<<<<',
|
|
|
mid_marker='=======',
|
|
|
end_marker='>>>>>>>',
|
|
|
base_marker=None,
|
|
|
localorother=None,
|
|
|
minimize=False):
|
|
|
"""Return merge in cvs-like form.
|
|
|
"""
|
|
|
self.conflicts = False
|
|
|
newline = '\n'
|
|
|
if len(self.a) > 0:
|
|
|
if self.a[0].endswith('\r\n'):
|
|
|
newline = '\r\n'
|
|
|
elif self.a[0].endswith('\r'):
|
|
|
newline = '\r'
|
|
|
if name_a and start_marker:
|
|
|
start_marker = start_marker + ' ' + name_a
|
|
|
if name_b and end_marker:
|
|
|
end_marker = end_marker + ' ' + name_b
|
|
|
if name_base and base_marker:
|
|
|
base_marker = base_marker + ' ' + name_base
|
|
|
merge_regions = self.merge_regions()
|
|
|
if minimize:
|
|
|
merge_regions = self.minimize(merge_regions)
|
|
|
for t in merge_regions:
|
|
|
what = t[0]
|
|
|
if what == 'unchanged':
|
|
|
for i in range(t[1], t[2]):
|
|
|
yield self.base[i]
|
|
|
elif what == 'a' or what == 'same':
|
|
|
for i in range(t[1], t[2]):
|
|
|
yield self.a[i]
|
|
|
elif what == 'b':
|
|
|
for i in range(t[1], t[2]):
|
|
|
yield self.b[i]
|
|
|
elif what == 'conflict':
|
|
|
if localorother == 'local':
|
|
|
for i in range(t[3], t[4]):
|
|
|
yield self.a[i]
|
|
|
elif localorother == 'other':
|
|
|
for i in range(t[5], t[6]):
|
|
|
yield self.b[i]
|
|
|
else:
|
|
|
self.conflicts = True
|
|
|
if start_marker is not None:
|
|
|
yield start_marker + newline
|
|
|
for i in range(t[3], t[4]):
|
|
|
yield self.a[i]
|
|
|
if base_marker is not None:
|
|
|
yield base_marker + newline
|
|
|
for i in range(t[1], t[2]):
|
|
|
yield self.base[i]
|
|
|
if mid_marker is not None:
|
|
|
yield mid_marker + newline
|
|
|
for i in range(t[5], t[6]):
|
|
|
yield self.b[i]
|
|
|
if end_marker is not None:
|
|
|
yield end_marker + newline
|
|
|
else:
|
|
|
raise ValueError(what)
|
|
|
|
|
|
def merge_groups(self):
|
|
|
"""Yield sequence of line groups. Each one is a tuple:
|
|
|
|
|
|
'unchanged', lines
|
|
|
Lines unchanged from base
|
|
|
|
|
|
'a', lines
|
|
|
Lines taken from a
|
|
|
|
|
|
'same', lines
|
|
|
Lines taken from a (and equal to b)
|
|
|
|
|
|
'b', lines
|
|
|
Lines taken from b
|
|
|
|
|
|
'conflict', base_lines, a_lines, b_lines
|
|
|
Lines from base were changed to either a or b and conflict.
|
|
|
"""
|
|
|
for t in self.merge_regions():
|
|
|
what = t[0]
|
|
|
if what == 'unchanged':
|
|
|
yield what, self.base[t[1]:t[2]]
|
|
|
elif what == 'a' or what == 'same':
|
|
|
yield what, self.a[t[1]:t[2]]
|
|
|
elif what == 'b':
|
|
|
yield what, self.b[t[1]:t[2]]
|
|
|
elif what == 'conflict':
|
|
|
yield (what,
|
|
|
self.base[t[1]:t[2]],
|
|
|
self.a[t[3]:t[4]],
|
|
|
self.b[t[5]:t[6]])
|
|
|
else:
|
|
|
raise ValueError(what)
|
|
|
|
|
|
def merge_regions(self):
|
|
|
"""Return sequences of matching and conflicting regions.
|
|
|
|
|
|
This returns tuples, where the first value says what kind we
|
|
|
have:
|
|
|
|
|
|
'unchanged', start, end
|
|
|
Take a region of base[start:end]
|
|
|
|
|
|
'same', astart, aend
|
|
|
b and a are different from base but give the same result
|
|
|
|
|
|
'a', start, end
|
|
|
Non-clashing insertion from a[start:end]
|
|
|
|
|
|
'conflict', zstart, zend, astart, aend, bstart, bend
|
|
|
Conflict between a and b, with z as common ancestor
|
|
|
|
|
|
Method is as follows:
|
|
|
|
|
|
The two sequences align only on regions which match the base
|
|
|
and both descendants. These are found by doing a two-way diff
|
|
|
of each one against the base, and then finding the
|
|
|
intersections between those regions. These "sync regions"
|
|
|
are by definition unchanged in both and easily dealt with.
|
|
|
|
|
|
The regions in between can be in any of three cases:
|
|
|
conflicted, or changed on only one side.
|
|
|
"""
|
|
|
|
|
|
# section a[0:ia] has been disposed of, etc
|
|
|
iz = ia = ib = 0
|
|
|
|
|
|
for region in self.find_sync_regions():
|
|
|
zmatch, zend, amatch, aend, bmatch, bend = region
|
|
|
#print 'match base [%d:%d]' % (zmatch, zend)
|
|
|
|
|
|
matchlen = zend - zmatch
|
|
|
assert matchlen >= 0
|
|
|
assert matchlen == (aend - amatch)
|
|
|
assert matchlen == (bend - bmatch)
|
|
|
|
|
|
len_a = amatch - ia
|
|
|
len_b = bmatch - ib
|
|
|
len_base = zmatch - iz
|
|
|
assert len_a >= 0
|
|
|
assert len_b >= 0
|
|
|
assert len_base >= 0
|
|
|
|
|
|
#print 'unmatched a=%d, b=%d' % (len_a, len_b)
|
|
|
|
|
|
if len_a or len_b:
|
|
|
# try to avoid actually slicing the lists
|
|
|
equal_a = compare_range(self.a, ia, amatch,
|
|
|
self.base, iz, zmatch)
|
|
|
equal_b = compare_range(self.b, ib, bmatch,
|
|
|
self.base, iz, zmatch)
|
|
|
same = compare_range(self.a, ia, amatch,
|
|
|
self.b, ib, bmatch)
|
|
|
|
|
|
if same:
|
|
|
yield 'same', ia, amatch
|
|
|
elif equal_a and not equal_b:
|
|
|
yield 'b', ib, bmatch
|
|
|
elif equal_b and not equal_a:
|
|
|
yield 'a', ia, amatch
|
|
|
elif not equal_a and not equal_b:
|
|
|
yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch
|
|
|
else:
|
|
|
raise AssertionError("can't handle a=b=base but unmatched")
|
|
|
|
|
|
ia = amatch
|
|
|
ib = bmatch
|
|
|
iz = zmatch
|
|
|
|
|
|
# if the same part of the base was deleted on both sides
|
|
|
# that's OK, we can just skip it.
|
|
|
|
|
|
|
|
|
if matchlen > 0:
|
|
|
assert ia == amatch
|
|
|
assert ib == bmatch
|
|
|
assert iz == zmatch
|
|
|
|
|
|
yield 'unchanged', zmatch, zend
|
|
|
iz = zend
|
|
|
ia = aend
|
|
|
ib = bend
|
|
|
|
|
|
def minimize(self, merge_regions):
|
|
|
"""Trim conflict regions of lines where A and B sides match.
|
|
|
|
|
|
Lines where both A and B have made the same changes at the beginning
|
|
|
or the end of each merge region are eliminated from the conflict
|
|
|
region and are instead considered the same.
|
|
|
"""
|
|
|
for region in merge_regions:
|
|
|
if region[0] != "conflict":
|
|
|
yield region
|
|
|
continue
|
|
|
issue, z1, z2, a1, a2, b1, b2 = region
|
|
|
alen = a2 - a1
|
|
|
blen = b2 - b1
|
|
|
|
|
|
# find matches at the front
|
|
|
ii = 0
|
|
|
while ii < alen and ii < blen and \
|
|
|
self.a[a1 + ii] == self.b[b1 + ii]:
|
|
|
ii += 1
|
|
|
startmatches = ii
|
|
|
|
|
|
# find matches at the end
|
|
|
ii = 0
|
|
|
while ii < alen and ii < blen and \
|
|
|
self.a[a2 - ii - 1] == self.b[b2 - ii - 1]:
|
|
|
ii += 1
|
|
|
endmatches = ii
|
|
|
|
|
|
if startmatches > 0:
|
|
|
yield 'same', a1, a1 + startmatches
|
|
|
|
|
|
yield ('conflict', z1, z2,
|
|
|
a1 + startmatches, a2 - endmatches,
|
|
|
b1 + startmatches, b2 - endmatches)
|
|
|
|
|
|
if endmatches > 0:
|
|
|
yield 'same', a2 - endmatches, a2
|
|
|
|
|
|
def find_sync_regions(self):
|
|
|
"""Return a list of sync regions, where both descendants match the base.
|
|
|
|
|
|
Generates a list of (base1, base2, a1, a2, b1, b2). There is
|
|
|
always a zero-length sync region at the end of all the files.
|
|
|
"""
|
|
|
|
|
|
ia = ib = 0
|
|
|
amatches = mdiff.get_matching_blocks(self.basetext, self.atext)
|
|
|
bmatches = mdiff.get_matching_blocks(self.basetext, self.btext)
|
|
|
len_a = len(amatches)
|
|
|
len_b = len(bmatches)
|
|
|
|
|
|
sl = []
|
|
|
|
|
|
while ia < len_a and ib < len_b:
|
|
|
abase, amatch, alen = amatches[ia]
|
|
|
bbase, bmatch, blen = bmatches[ib]
|
|
|
|
|
|
# there is an unconflicted block at i; how long does it
|
|
|
# extend? until whichever one ends earlier.
|
|
|
i = intersect((abase, abase + alen), (bbase, bbase + blen))
|
|
|
if i:
|
|
|
intbase = i[0]
|
|
|
intend = i[1]
|
|
|
intlen = intend - intbase
|
|
|
|
|
|
# found a match of base[i[0], i[1]]; this may be less than
|
|
|
# the region that matches in either one
|
|
|
assert intlen <= alen
|
|
|
assert intlen <= blen
|
|
|
assert abase <= intbase
|
|
|
assert bbase <= intbase
|
|
|
|
|
|
asub = amatch + (intbase - abase)
|
|
|
bsub = bmatch + (intbase - bbase)
|
|
|
aend = asub + intlen
|
|
|
bend = bsub + intlen
|
|
|
|
|
|
assert self.base[intbase:intend] == self.a[asub:aend], \
|
|
|
(self.base[intbase:intend], self.a[asub:aend])
|
|
|
|
|
|
assert self.base[intbase:intend] == self.b[bsub:bend]
|
|
|
|
|
|
sl.append((intbase, intend,
|
|
|
asub, aend,
|
|
|
bsub, bend))
|
|
|
|
|
|
# advance whichever one ends first in the base text
|
|
|
if (abase + alen) < (bbase + blen):
|
|
|
ia += 1
|
|
|
else:
|
|
|
ib += 1
|
|
|
|
|
|
intbase = len(self.base)
|
|
|
abase = len(self.a)
|
|
|
bbase = len(self.b)
|
|
|
sl.append((intbase, intbase, abase, abase, bbase, bbase))
|
|
|
|
|
|
return sl
|
|
|
|
|
|
def find_unconflicted(self):
|
|
|
"""Return a list of ranges in base that are not conflicted."""
|
|
|
am = mdiff.get_matching_blocks(self.basetext, self.atext)
|
|
|
bm = mdiff.get_matching_blocks(self.basetext, self.btext)
|
|
|
|
|
|
unc = []
|
|
|
|
|
|
while am and bm:
|
|
|
# there is an unconflicted block at i; how long does it
|
|
|
# extend? until whichever one ends earlier.
|
|
|
a1 = am[0][0]
|
|
|
a2 = a1 + am[0][2]
|
|
|
b1 = bm[0][0]
|
|
|
b2 = b1 + bm[0][2]
|
|
|
i = intersect((a1, a2), (b1, b2))
|
|
|
if i:
|
|
|
unc.append(i)
|
|
|
|
|
|
if a2 < b2:
|
|
|
del am[0]
|
|
|
else:
|
|
|
del bm[0]
|
|
|
|
|
|
return unc
|
|
|
|
|
|
def _verifytext(text, path, ui, opts):
|
|
|
"""verifies that text is non-binary (unless opts[text] is passed,
|
|
|
then we just warn)"""
|
|
|
if util.binary(text):
|
|
|
msg = _("%s looks like a binary file.") % path
|
|
|
if not opts.get('quiet'):
|
|
|
ui.warn(_('warning: %s\n') % msg)
|
|
|
if not opts.get('text'):
|
|
|
raise error.Abort(msg)
|
|
|
return text
|
|
|
|
|
|
def _picklabels(defaults, overrides):
|
|
|
name_a, name_b, name_base = defaults
|
|
|
|
|
|
if len(overrides) > 0:
|
|
|
name_a = overrides[0]
|
|
|
if len(overrides) > 1:
|
|
|
name_b = overrides[1]
|
|
|
if len(overrides) > 2:
|
|
|
name_base = overrides[2]
|
|
|
if len(overrides) > 3:
|
|
|
raise error.Abort(_("can only specify three labels."))
|
|
|
|
|
|
return [name_a, name_b, name_base]
|
|
|
|
|
|
def simplemerge(ui, localfile, basefile, otherfile,
|
|
|
localctx=None, basectx=None, otherctx=None, repo=None, **opts):
|
|
|
"""Performs the simplemerge algorithm.
|
|
|
|
|
|
{local|base|other}ctx are optional. If passed, they (local/base/other) will
|
|
|
be read from and the merge result written to (local). You should pass
|
|
|
explicit labels in this mode since the default is to use the file paths.
|
|
|
"""
|
|
|
def readctx(ctx):
|
|
|
if not ctx:
|
|
|
return None
|
|
|
# Merges were always run in the working copy before, which means
|
|
|
# they used decoded data, if the user defined any repository
|
|
|
# filters.
|
|
|
#
|
|
|
# Maintain that behavior today for BC, though perhaps in the future
|
|
|
# it'd be worth considering whether merging encoded data (what the
|
|
|
# repository usually sees) might be more useful.
|
|
|
return _verifytext(ctx.decodeddata(), ctx.path(), ui, opts)
|
|
|
|
|
|
class ctxwriter(object):
|
|
|
def __init__(self, ctx):
|
|
|
self.ctx = ctx
|
|
|
self.text = ""
|
|
|
|
|
|
def write(self, text):
|
|
|
self.text += text
|
|
|
|
|
|
def close(self):
|
|
|
self.ctx.write(self.text, self.ctx.flags())
|
|
|
|
|
|
mode = opts.get('mode','merge')
|
|
|
name_a, name_b, name_base = None, None, None
|
|
|
if mode != 'union':
|
|
|
name_a, name_b, name_base = _picklabels([localctx.path(),
|
|
|
otherctx.path(), None],
|
|
|
opts.get('label', []))
|
|
|
|
|
|
try:
|
|
|
localtext = readctx(localctx)
|
|
|
basetext = readctx(basectx)
|
|
|
othertext = readctx(otherctx)
|
|
|
except error.Abort:
|
|
|
return 1
|
|
|
|
|
|
if opts.get('print'):
|
|
|
out = ui.fout
|
|
|
else:
|
|
|
out = ctxwriter(localctx)
|
|
|
|
|
|
m3 = Merge3Text(basetext, localtext, othertext)
|
|
|
extrakwargs = {
|
|
|
"localorother": opts.get("localorother", None),
|
|
|
'minimize': True,
|
|
|
}
|
|
|
if mode == 'union':
|
|
|
extrakwargs['start_marker'] = None
|
|
|
extrakwargs['mid_marker'] = None
|
|
|
extrakwargs['end_marker'] = None
|
|
|
elif name_base is not None:
|
|
|
extrakwargs['base_marker'] = '|||||||'
|
|
|
extrakwargs['name_base'] = name_base
|
|
|
extrakwargs['minimize'] = False
|
|
|
for line in m3.merge_lines(name_a=name_a, name_b=name_b,
|
|
|
**pycompat.strkwargs(extrakwargs)):
|
|
|
out.write(line)
|
|
|
|
|
|
if not opts.get('print'):
|
|
|
out.close()
|
|
|
|
|
|
if m3.conflicts and not mode == 'union':
|
|
|
return 1
|
|
|
|