import struct

from mercurial import bdiff, mpatch

def test1(a, b):

    d = bdiff.bdiff(a, b)

    c = a

    if d:

        c = mpatch.patches(a, [d])

    if c != b:

        print "***", repr(a), repr(b)

        print "bad:"

        print repr(c)[:200]

        print repr(d)

def test(a, b):

    print "***", repr(a), repr(b)

    test1(a, b)

    test1(b, a)

test("a\nc\n\n\n\n", "a\nb\n\n\n")

test("a\nb\nc\n", "a\nc\n")

test("", "")

test("a\nb\nc", "a\nb\nc")

test("a\nb\nc\nd\n", "a\nd\n")

test("a\nb\nc\nd\n", "a\nc\ne\n")

test("a\nb\nc\n", "a\nc\n")

test("a\n", "c\na\nb\n")

test("a\n", "")

test("a\n", "b\nc\n")

test("a\n", "c\na\n")

test("", "adjfkjdjksdhfksj")

test("", "ab")

test("", "abc")

test("a", "a")

test("ab", "ab")

test("abc", "abc")

test("a\n", "a\n")

test("a\nb", "a\nb")

#issue1295

def showdiff(a, b):

    bin = bdiff.bdiff(a, b)

    pos = 0

    while pos < len(bin):

        p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])

        pos += 12

        print p1, p2, repr(bin[pos:pos + l])

        pos += l

showdiff("x\n\nx\n\nx\n\nx\n\nz\n", "x\n\nx\n\ny\n\nx\n\nx\n\nz\n")

showdiff("x\n\nx\n\nx\n\nx\n\nz\n", "x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n")

print "done"