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Forked from gimite/gist:113234
Created May 20, 2009 01:22
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Colordiff by shin_h
#!/usr/bin/env python
# Copyright (c) 2009, Shinichiro Hamaji
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of the <ORGANIZATION> nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import difflib
import fileinput
import re
import sys
class ColorDiff:
RED = '\033[1;31m'
BLUE = '\033[1;34m'
MAGENTA = '\033[1;35m'
DARK_RED = '\033[0;31m'
DARK_BLUE = '\033[0;34m'
DARK_MAGENTA = '\033[0;35m'
DARK_CYAN = '\033[0;36m'
CANCEL = '\033[0m'
def __init__(self):
self.clear()
def clear(self):
self.minus_buf = ''
self.plus_buf = ''
def concatWithColor(self, dst, col, src):
return dst + col + ''.join(src).replace('\n', '\n' + col)
def tokenize(self, line):
r = re.findall('[a-zA-Z0-9_]+| +|\r*\n|.', line, re.DOTALL)
return r
def flushAll(self):
if self.minus_buf and self.plus_buf:
minus = ''
plus = ''
minus_buf = self.tokenize(self.minus_buf)
plus_buf = self.tokenize(self.plus_buf)
for op, ms, me, ps, pe in difflib.SequenceMatcher(
None, minus_buf, plus_buf).get_opcodes():
m = minus_buf[ms:me]
p = plus_buf[ps:pe]
if op == 'delete':
minus = self.concatWithColor(minus, ColorDiff.RED, m)
elif op == 'equal':
minus = self.concatWithColor(
minus, ColorDiff.DARK_RED, m)
plus = self.concatWithColor(plus, ColorDiff.DARK_BLUE, p)
elif op == 'insert':
plus = self.concatWithColor(plus, ColorDiff.BLUE, p)
elif op == 'replace':
minus = self.concatWithColor(minus, ColorDiff.RED, m)
plus = self.concatWithColor(plus, ColorDiff.BLUE, p)
sys.stdout.write(minus + plus + ColorDiff.CANCEL)
else:
self.outputMinus(self.minus_buf)
self.outputPlus(self.plus_buf)
self.clear()
def outputPlus(self, lines):
sys.stdout.write(ColorDiff.BLUE + lines + ColorDiff.CANCEL)
def outputMinus(self, lines):
sys.stdout.write(ColorDiff.RED + lines + ColorDiff.CANCEL)
def run(self):
for line in fileinput.input():
if line.startswith('-'):
if self.plus_buf:
self.flushAll()
self.minus_buf += line
elif line.startswith('+'):
if self.minus_buf:
self.plus_buf += line
else:
self.outputPlus(line)
else:
self.flushAll()
sys.stdout.write(line)
self.flushAll()
ColorDiff().run()
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