make diff dates be epoch for add/remove

mercurial/mdiff.py

@@ -1,123 +1,124 b''
 # mdiff.py - diff and patch routines for mercurial
 #
 # Copyright 2005 Matt Mackall <[e-mail]>
 #
 # 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
 from mpatch import *
 from util import *
 
 def unidiff(a, ad, b, bd, fn, r=None, text=False):
 
     if not a and not b: return ""
+    epoch = datestr((0,0))
 
     if not text and (binary(a) or binary(b)):
         l = ['Binary file %s has changed\n' % fn]
     elif a == None:
         b = b.splitlines(1)
-        l1 = "--- %s\t%s\n" % ("/dev/null", ad)
+        l1 = "--- %s\t%s\n" % ("/dev/null", epoch)
         l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
         l3 = "@@ -0,0 +1,%d @@\n" % len(b)
         l = [l1, l2, l3] + ["+" + e for e in b]
     elif b == None:
         a = a.splitlines(1)
         l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
-        l2 = "+++ %s\t%s\n" % ("/dev/null", bd)
+        l2 = "+++ %s\t%s\n" % ("/dev/null", epoch)
         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))
         if not l: return ""
         # difflib uses a space, rather than a tab
         l[0] = l[0][:-2] + "\t" + ad + "\n"
         l[1] = l[1][:-2] + "\t" + bd + "\n"
 
     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, "diff %s %s\n" %
                     (' '.join(["-r %s" % rev for rev in r]), fn))
 
     return "".join(l)
 
 def sortdiff(a, b):
     la = lb = 0
     lena = len(a)
     lenb = len(b)
 
     while 1:
         am, bm, = la, lb
 
         # walk over matching lines
         while lb < lenb and la < lena and a[la] == b[lb] :
             la += 1
             lb += 1
 
         if la > am:
             yield (am, bm, la - am) # return a match
 
         # skip mismatched lines from b
         while la < lena and lb < lenb and b[lb] < a[la]:
             lb += 1
 
         if lb >= lenb:
             break
 
         # skip mismatched lines from a
         while la < lena and lb < lenb and b[lb] > a[la]:
             la += 1
 
         if la >= lena:
             break
 
     yield (lena, lenb, 0)
 
 def diff(a, b, sorted=0):
     if not a:
         s = "".join(b)
         return s and (struct.pack(">lll", 0, 0, len(s)) + s)
 
     bin = []
     p = [0]
     for i in a: p.append(p[-1] + len(i))
 
     if sorted:
         try:
             d = sortdiff(a, b)
         except:
             raise
     else:
         d = difflib.SequenceMatcher(None, a, b).get_matching_blocks()
     la = 0
     lb = 0
     for am, bm, size in d:
         s = "".join(b[lb:bm])
         if am > la or s:
             bin.append(struct.pack(">lll", p[la], p[am], len(s)) + s)
         la = am + size
         lb = bm + size
 
     return "".join(bin)
 
 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 patches(a, [bin])
 
 textdiff = bdiff.bdiff