comparison mercurial/mdiff.py @ 17939:d587925680d9

diff: move b85diff to mdiff module

b85diff generates a binary diff, so we move this code to mdiff module
along with unidiff for text diffs. All diffing mechanisms will be in the
same place.

In an upcoming patch we will remove the responsibility to print the
index header from b85diff and move it back to patch, since it's
a patch metadata header, not part of the diff generation.

17935:9c888b945b65

# 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 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])

17939:d587925680d9

# 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, base85, zlib
from node import hex, nullid

def splitnewlines(text):
    '''like str.splitlines, but only split on newlines.'''
    lines = [l + '\n' for l in text.split('\n')]
    if lines:

    if hunk:
        for x in yieldhunk(hunk):
            yield x

def b85diff(to, tn):
    '''print base85-encoded binary diff'''
    def gitindex(text):
        if not text:
            return hex(nullid)
        l = len(text)
        s = util.sha1('blob %d\0' % l)
        s.update(text)
        return s.hexdigest()

    def fmtline(line):
        l = len(line)
        if l <= 26:
            l = chr(ord('A') + l - 1)
        else:
            l = chr(l - 26 + ord('a') - 1)
        return '%c%s\n' % (l, base85.b85encode(line, True))

    def chunk(text, csize=52):
        l = len(text)
        i = 0
        while i < l:
            yield text[i:i + csize]
            i += csize

    tohash = gitindex(to)
    tnhash = gitindex(tn)
    if tohash == tnhash:
        return ""

    # TODO: deltas
    ret = ['index %s..%s\nGIT binary patch\nliteral %s\n' %
           (tohash, tnhash, len(tn))]
    for l in chunk(zlib.compress(tn)):
        ret.append(fmtline(l))
    ret.append('\n')
    return ''.join(ret)

def patchtext(bin):
    pos = 0
    t = []
    while pos < len(bin):
        p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])