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−# diffhelpers.py - pure Python implementation of diffhelpers.c
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−#
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−# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
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−#
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−# This software may be used and distributed according to the terms of the
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−# GNU General Public License version 2 or any later version.
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−
+
−from __future__ import absolute_import
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−
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−def addlines(fp, hunk, lena, lenb, a, b):
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−    while True:
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−        todoa = lena - len(a)
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−        todob = lenb - len(b)
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−        num = max(todoa, todob)
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−        if num == 0:
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−            break
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−        for i in xrange(num):
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−            s = fp.readline()
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−            c = s[0]
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−            if s == "\\ No newline at end of file\n":
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−                fix_newline(hunk, a, b)
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−                continue
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−            if c == "\n":
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−                # Some patches may be missing the control char
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−                # on empty lines. Supply a leading space.
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−                s = " \n"
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−            hunk.append(s)
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−            if c == "+":
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−                b.append(s[1:])
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−            elif c == "-":
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−                a.append(s)
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−            else:
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−                b.append(s[1:])
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−                a.append(s)
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−    return 0
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−
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−def fix_newline(hunk, a, b):
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−    l = hunk[-1]
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−    # tolerate CRLF in last line
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−    if l.endswith('\r\n'):
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−        hline = l[:-2]
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−    else:
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−        hline = l[:-1]
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−    c = hline[0]
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−
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−    if c in " +":
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−        b[-1] = hline[1:]
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−    if c in " -":
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−        a[-1] = hline
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−    hunk[-1] = hline
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−    return 0
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−
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−
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−def testhunk(a, b, bstart):
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−    alen = len(a)
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−    blen = len(b)
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−    if alen > blen - bstart:
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−        return -1
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−    for i in xrange(alen):
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−        if a[i][1:] != b[i + bstart]:
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−            return -1
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−    return 0