test-log: Add test for "hg log -pf" (issue647)
To test f786fc4b8764 we analyze this repo:
0 | 1 | 2 | 3 | 4
a ------------> b
\
b -> dir/b -------> e
d
We follow dir/b and expects rev 0, 1 and 2.
A log following b will surprisingly report rev 0 and 1. That's because the
content and the parents are the same in rev 1 and rev 3, and the revlog entry
from rev 1 is thus reused in rev 3 even though the revlink is incorrect.
Note that if we follow e then we will get all revs, including rev 3, because b
gets added to the set of interesting filenames we are following through all
revisions. That might be surprising, but that's (currently) how it is.
Original test case by Joel Rosdahl <joel@rosdahl.net>
Original test reviewed by Nicolas Dumazet <nicdumz@gmail.com>
# diffhelpers.py - pure Python implementation of diffhelpers.c
#
# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
def addlines(fp, hunk, lena, lenb, a, b):
while True:
todoa = lena - len(a)
todob = lenb - len(b)
num = max(todoa, todob)
if num == 0:
break
for i in xrange(num):
s = fp.readline()
c = s[0]
if s == "\\ No newline at end of file\n":
fix_newline(hunk, a, b)
continue
if c == "\n":
# Some patches may be missing the control char
# on empty lines. Supply a leading space.
s = " \n"
hunk.append(s)
if c == "+":
b.append(s[1:])
elif c == "-":
a.append(s)
else:
b.append(s[1:])
a.append(s)
return 0
def fix_newline(hunk, a, b):
l = hunk[-1]
# tolerate CRLF in last line
if l.endswith('\r\n'):
hline = l[:-2]
else:
hline = l[:-1]
c = hline[0]
if c == " " or c == "+":
b[-1] = hline[1:]
if c == " " or c == "-":
a[-1] = hline
hunk[-1] = hline
return 0
def testhunk(a, b, bstart):
alen = len(a)
blen = len(b)
if alen > blen - bstart:
return -1
for i in xrange(alen):
if a[i][1:] != b[i + bstart]:
return -1
return 0