Mercurial > hg
view mercurial/mdiff.py @ 2089:cb99c711c59f
make appendfile simpler so it does not break with revlogng on windows.
it used to cache open files. this made revlogng break because it wants
to rename files when splitting .i into .i/.d, but cannot rename or unlink
open files on windows.
new code is bit slower, but safe on linux and windows. proper fix for
too many open/close of changelog/manifest belongs in different place.
can get 10% speed improvement back.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
---|---|
date | Wed, 19 Apr 2006 08:33:46 -0700 |
parents | 441ea218414e |
children | b914f0557832 |
line wrap: on
line source
# mdiff.py - diff and patch routines for mercurial # # Copyright 2005 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms # of the GNU General Public License, incorporated herein by reference. from demandload import demandload import struct, bdiff, util, mpatch demandload(globals(), "re") 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)) if not text and (util.binary(a) or util.binary(b)): l = ['Binary file %s has changed\n' % fn] elif not a: b = b.splitlines(1) if a is None: l1 = "--- %s\t%s\n" % ("/dev/null", epoch) else: l1 = "--- %s\t%s\n" % ("a/" + fn, ad) 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 not b: a = a.splitlines(1) l1 = "--- %s\t%s\n" % ("a/" + fn, ad) if b is None: l2 = "+++ %s\t%s\n" % ("/dev/null", epoch) else: l2 = "+++ %s\t%s\n" % ("b/" + fn, bd) l3 = "@@ -1,%d +0,0 @@\n" % len(a) l = [l1, l2, l3] + ["-" + e for e in a] else: 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) l[1] = "%s\t%s\n" % (l[1][:-2], 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, "diff %s %s\n" % (' '.join(["-r %s" % rev for rev in r]), fn)) 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 = [] 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]) patches = mpatch.patches patchedsize = mpatch.patchedsize textdiff = bdiff.bdiff