|
|
# mdiff.py - diff and patch routines for mercurial
|
|
|
#
|
|
|
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
|
|
|
#
|
|
|
# This software may be used and distributed according to the terms of the
|
|
|
# GNU General Public License version 2 or any later version.
|
|
|
|
|
|
from i18n import _
|
|
|
import bdiff, mpatch, util
|
|
|
import re, struct
|
|
|
|
|
|
def splitnewlines(text):
|
|
|
'''like str.splitlines, but only split on newlines.'''
|
|
|
lines = [l + '\n' for l in text.split('\n')]
|
|
|
if lines:
|
|
|
if lines[-1] == '\n':
|
|
|
lines.pop()
|
|
|
else:
|
|
|
lines[-1] = lines[-1][:-1]
|
|
|
return lines
|
|
|
|
|
|
class diffopts(object):
|
|
|
'''context is the number of context lines
|
|
|
text treats all files as text
|
|
|
showfunc enables diff -p output
|
|
|
git enables the git extended patch format
|
|
|
nodates removes dates from diff headers
|
|
|
ignorews ignores all whitespace changes in the diff
|
|
|
ignorewsamount ignores changes in the amount of whitespace
|
|
|
ignoreblanklines ignores changes whose lines are all blank
|
|
|
upgrade generates git diffs to avoid data loss
|
|
|
'''
|
|
|
|
|
|
defaults = {
|
|
|
'context': 3,
|
|
|
'text': False,
|
|
|
'showfunc': False,
|
|
|
'git': False,
|
|
|
'nodates': False,
|
|
|
'ignorews': False,
|
|
|
'ignorewsamount': False,
|
|
|
'ignoreblanklines': False,
|
|
|
'upgrade': False,
|
|
|
}
|
|
|
|
|
|
__slots__ = defaults.keys()
|
|
|
|
|
|
def __init__(self, **opts):
|
|
|
for k in self.__slots__:
|
|
|
v = opts.get(k)
|
|
|
if v is None:
|
|
|
v = self.defaults[k]
|
|
|
setattr(self, k, v)
|
|
|
|
|
|
try:
|
|
|
self.context = int(self.context)
|
|
|
except ValueError:
|
|
|
raise util.Abort(_('diff context lines count must be '
|
|
|
'an integer, not %r') % self.context)
|
|
|
|
|
|
def copy(self, **kwargs):
|
|
|
opts = dict((k, getattr(self, k)) for k in self.defaults)
|
|
|
opts.update(kwargs)
|
|
|
return diffopts(**opts)
|
|
|
|
|
|
defaultopts = diffopts()
|
|
|
|
|
|
def wsclean(opts, text, blank=True):
|
|
|
if opts.ignorews:
|
|
|
text = re.sub('[ \t]+', '', text)
|
|
|
elif opts.ignorewsamount:
|
|
|
text = re.sub('[ \t]+', ' ', text)
|
|
|
text = re.sub('[ \t]+\n', '\n', text)
|
|
|
if blank and opts.ignoreblanklines:
|
|
|
text = re.sub('\n+', '', text)
|
|
|
return text
|
|
|
|
|
|
def diffline(revs, a, b, opts):
|
|
|
parts = ['diff']
|
|
|
if opts.git:
|
|
|
parts.append('--git')
|
|
|
if revs and not opts.git:
|
|
|
parts.append(' '.join(["-r %s" % rev for rev in revs]))
|
|
|
if opts.git:
|
|
|
parts.append('a/%s' % a)
|
|
|
parts.append('b/%s' % b)
|
|
|
else:
|
|
|
parts.append(a)
|
|
|
return ' '.join(parts) + '\n'
|
|
|
|
|
|
def unidiff(a, ad, b, bd, fn1, fn2, r=None, opts=defaultopts):
|
|
|
def datetag(date, addtab=True):
|
|
|
if not opts.git and not opts.nodates:
|
|
|
return '\t%s\n' % date
|
|
|
if addtab and ' ' in fn1:
|
|
|
return '\t\n'
|
|
|
return '\n'
|
|
|
|
|
|
if not a and not b:
|
|
|
return ""
|
|
|
epoch = util.datestr((0, 0))
|
|
|
|
|
|
if not opts.text and (util.binary(a) or util.binary(b)):
|
|
|
if a and b and len(a) == len(b) and a == b:
|
|
|
return ""
|
|
|
l = ['Binary file %s has changed\n' % fn1]
|
|
|
elif not a:
|
|
|
b = splitnewlines(b)
|
|
|
if a is None:
|
|
|
l1 = '--- /dev/null%s' % datetag(epoch, False)
|
|
|
else:
|
|
|
l1 = "--- %s%s" % ("a/" + fn1, datetag(ad))
|
|
|
l2 = "+++ %s%s" % ("b/" + fn2, datetag(bd))
|
|
|
l3 = "@@ -0,0 +1,%d @@\n" % len(b)
|
|
|
l = [l1, l2, l3] + ["+" + e for e in b]
|
|
|
elif not b:
|
|
|
a = splitnewlines(a)
|
|
|
l1 = "--- %s%s" % ("a/" + fn1, datetag(ad))
|
|
|
if b is None:
|
|
|
l2 = '+++ /dev/null%s' % datetag(epoch, False)
|
|
|
else:
|
|
|
l2 = "+++ %s%s" % ("b/" + fn2, datetag(bd))
|
|
|
l3 = "@@ -1,%d +0,0 @@\n" % len(a)
|
|
|
l = [l1, l2, l3] + ["-" + e for e in a]
|
|
|
else:
|
|
|
al = splitnewlines(a)
|
|
|
bl = splitnewlines(b)
|
|
|
l = list(_unidiff(a, b, al, bl, opts=opts))
|
|
|
if not l:
|
|
|
return ""
|
|
|
|
|
|
l.insert(0, "--- a/%s%s" % (fn1, datetag(ad)))
|
|
|
l.insert(1, "+++ b/%s%s" % (fn2, datetag(bd)))
|
|
|
|
|
|
for ln in xrange(len(l)):
|
|
|
if l[ln][-1] != '\n':
|
|
|
l[ln] += "\n\ No newline at end of file\n"
|
|
|
|
|
|
if r:
|
|
|
l.insert(0, diffline(r, fn1, fn2, opts))
|
|
|
|
|
|
return "".join(l)
|
|
|
|
|
|
# creates a headerless unified diff
|
|
|
# t1 and t2 are the text to be diffed
|
|
|
# l1 and l2 are the text broken up into lines
|
|
|
def _unidiff(t1, t2, l1, l2, opts=defaultopts):
|
|
|
def contextend(l, len):
|
|
|
ret = l + opts.context
|
|
|
if ret > len:
|
|
|
ret = len
|
|
|
return ret
|
|
|
|
|
|
def contextstart(l):
|
|
|
ret = l - opts.context
|
|
|
if ret < 0:
|
|
|
return 0
|
|
|
return ret
|
|
|
|
|
|
def yieldhunk(hunk):
|
|
|
(astart, a2, bstart, b2, delta) = hunk
|
|
|
aend = contextend(a2, len(l1))
|
|
|
alen = aend - astart
|
|
|
blen = b2 - bstart + aend - a2
|
|
|
|
|
|
func = ""
|
|
|
if opts.showfunc:
|
|
|
# walk backwards from the start of the context
|
|
|
# to find a line starting with an alphanumeric char.
|
|
|
for x in xrange(astart - 1, -1, -1):
|
|
|
t = l1[x].rstrip()
|
|
|
if funcre.match(t):
|
|
|
func = ' ' + t[:40]
|
|
|
break
|
|
|
|
|
|
yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen,
|
|
|
bstart + 1, blen, func)
|
|
|
for x in delta:
|
|
|
yield x
|
|
|
for x in xrange(a2, aend):
|
|
|
yield ' ' + l1[x]
|
|
|
|
|
|
if opts.showfunc:
|
|
|
funcre = re.compile('\w')
|
|
|
|
|
|
# bdiff.blocks gives us the matching sequences in the files. The loop
|
|
|
# below finds the spaces between those matching sequences and translates
|
|
|
# them into diff output.
|
|
|
#
|
|
|
if opts.ignorews or opts.ignorewsamount:
|
|
|
t1 = wsclean(opts, t1, False)
|
|
|
t2 = wsclean(opts, t2, False)
|
|
|
|
|
|
diff = bdiff.blocks(t1, t2)
|
|
|
hunk = None
|
|
|
for i, s1 in enumerate(diff):
|
|
|
# The first match is special.
|
|
|
# we've either found a match starting at line 0 or a match later
|
|
|
# in the file. If it starts later, old and new below will both be
|
|
|
# empty and we'll continue to the next match.
|
|
|
if i > 0:
|
|
|
s = diff[i - 1]
|
|
|
else:
|
|
|
s = [0, 0, 0, 0]
|
|
|
delta = []
|
|
|
a1 = s[1]
|
|
|
a2 = s1[0]
|
|
|
b1 = s[3]
|
|
|
b2 = s1[2]
|
|
|
|
|
|
old = l1[a1:a2]
|
|
|
new = l2[b1:b2]
|
|
|
|
|
|
# bdiff sometimes gives huge matches past eof, this check eats them,
|
|
|
# and deals with the special first match case described above
|
|
|
if not old and not new:
|
|
|
continue
|
|
|
|
|
|
if opts.ignoreblanklines:
|
|
|
if wsclean(opts, "".join(old)) == wsclean(opts, "".join(new)):
|
|
|
continue
|
|
|
|
|
|
astart = contextstart(a1)
|
|
|
bstart = contextstart(b1)
|
|
|
prev = None
|
|
|
if hunk:
|
|
|
# join with the previous hunk if it falls inside the context
|
|
|
if astart < hunk[1] + opts.context + 1:
|
|
|
prev = hunk
|
|
|
astart = hunk[1]
|
|
|
bstart = hunk[3]
|
|
|
else:
|
|
|
for x in yieldhunk(hunk):
|
|
|
yield x
|
|
|
if prev:
|
|
|
# we've joined the previous hunk, record the new ending points.
|
|
|
hunk[1] = a2
|
|
|
hunk[3] = b2
|
|
|
delta = hunk[4]
|
|
|
else:
|
|
|
# create a new hunk
|
|
|
hunk = [astart, a2, bstart, b2, delta]
|
|
|
|
|
|
delta[len(delta):] = [' ' + x for x in l1[astart:a1]]
|
|
|
delta[len(delta):] = ['-' + x for x in old]
|
|
|
delta[len(delta):] = ['+' + x for x in new]
|
|
|
|
|
|
if hunk:
|
|
|
for x in yieldhunk(hunk):
|
|
|
yield x
|
|
|
|
|
|
def patchtext(bin):
|
|
|
pos = 0
|
|
|
t = []
|
|
|
while pos < len(bin):
|
|
|
p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
|
|
|
pos += 12
|
|
|
t.append(bin[pos:pos + l])
|
|
|
pos += l
|
|
|
return "".join(t)
|
|
|
|
|
|
def patch(a, bin):
|
|
|
return mpatch.patches(a, [bin])
|
|
|
|
|
|
# similar to difflib.SequenceMatcher.get_matching_blocks
|
|
|
def get_matching_blocks(a, b):
|
|
|
return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)]
|
|
|
|
|
|
def trivialdiffheader(length):
|
|
|
return struct.pack(">lll", 0, 0, length)
|
|
|
|
|
|
patches = mpatch.patches
|
|
|
patchedsize = mpatch.patchedsize
|
|
|
textdiff = bdiff.bdiff
|
|
|
|
