--- a/mercurial/mdiff.py Tue Jan 24 14:49:19 2006 +1300
+++ b/mercurial/mdiff.py Tue Jan 24 15:02:10 2006 +1300
@@ -5,9 +5,13 @@
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
-import difflib, struct, bdiff, util, mpatch
+from demandload import demandload
+import struct, bdiff, util, mpatch
+demandload(globals(), "re")
-def unidiff(a, ad, b, bd, fn, r=None, text=False):
+
+def unidiff(a, ad, b, bd, fn, r=None, text=False,
+ showfunc=False, ignorews=False):
if not a and not b: return ""
epoch = util.datestr((0, 0))
@@ -27,9 +31,10 @@
l3 = "@@ -1,%d +0,0 @@\n" % len(a)
l = [l1, l2, l3] + ["-" + e for e in a]
else:
- a = a.splitlines(1)
- b = b.splitlines(1)
- l = list(difflib.unified_diff(a, b, "a/" + fn, "b/" + fn))
+ al = a.splitlines(1)
+ bl = b.splitlines(1)
+ l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn,
+ showfunc=showfunc, ignorews=ignorews))
if not l: return ""
# difflib uses a space, rather than a tab
l[0] = "%s\t%s\n" % (l[0][:-2], ad)
@@ -45,6 +50,128 @@
return "".join(l)
+# somewhat self contained replacement for difflib.unified_diff
+# t1 and t2 are the text to be diffed
+# l1 and l2 are the text broken up into lines
+# header1 and header2 are the filenames for the diff output
+# context is the number of context lines
+# showfunc enables diff -p output
+# ignorews ignores all whitespace changes in the diff
+def bunidiff(t1, t2, l1, l2, header1, header2, context=3, showfunc=False,
+ ignorews=False):
+ def contextend(l, len):
+ ret = l + context
+ if ret > len:
+ ret = len
+ return ret
+
+ def contextstart(l):
+ ret = l - context
+ if ret < 0:
+ return 0
+ return ret
+
+ def yieldhunk(hunk, header):
+ if header:
+ for x in header:
+ yield x
+ (astart, a2, bstart, b2, delta) = hunk
+ aend = contextend(a2, len(l1))
+ alen = aend - astart
+ blen = b2 - bstart + aend - a2
+
+ func = ""
+ if 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):
+ 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]
+
+ header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ]
+
+ if showfunc:
+ funcre = re.compile('\w')
+ if ignorews:
+ wsre = re.compile('[ \t]')
+
+ # 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.
+ #
+ diff = bdiff.blocks(t1, t2)
+ hunk = None
+ for i in xrange(len(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 = []
+ s1 = diff[i]
+ 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 ignorews:
+ wsold = wsre.sub('', "".join(old))
+ wsnew = wsre.sub('', "".join(new))
+ if wsold == wsnew:
+ 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] + context + 1:
+ prev = hunk
+ astart = hunk[1]
+ bstart = hunk[3]
+ else:
+ for x in yieldhunk(hunk, header):
+ yield x
+ # we only want to yield the header if the files differ, and
+ # we only want to yield it once.
+ header = None
+ 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, header):
+ yield x
+
def patchtext(bin):
pos = 0
t = []