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#!/usr/bin/env python
#
# Walk through a pair of textfiles looking for where they begin to differ.
# May be useful for comparing logs when regression tests break.
#
# This file is Copyright (c) 2010 by the GPSD project
# BSD terms apply: see the file COPYING in the distribution root for details.
#
# This code runs compatibly under Python 2 and 3.x for x >= 2.
# Preserve this property!
from __future__ import absolute_import, print_function, division
import sys
class BufferedFile(object):
def __init__(self, name):
self.file = open(name)
self.linebuffer = []
self.lineno = 0
def readline(self):
self.lineno += 1
if self.linebuffer:
return self.linebuffer.pop()
else:
return self.file.readline()
def pushback(self, line):
self.lineno -= 1
self.linebuffer.append(line)
def peek(self):
return self.linebuffer[-1]
def eatspan(f1, f2):
consumed = 0
while True:
line1 = f1.readline()
line2 = f2.readline()
if line1 and line2 and line1 == line2:
consumed += 1
continue
f1.pushback(line1)
f2.pushback(line2)
return consumed
if __name__ == "__main__":
f1 = BufferedFile(sys.argv[1])
f2 = BufferedFile(sys.argv[2])
eaten = eatspan(f1, f2)
print("First %d lines match" % eaten)
print(f1.peek())
print(f2.peek())
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