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executable file
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#!/usr/bin/env python
# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Convert a unified diff into a list of modified files and line numbers."""
import sys
class _LineBuffer(object):
"""Iterator over lines in a file supporting one-step rewind."""
def __init__(self, f):
self._f = f
self._prev = None
self._next = None
def __iter__(self):
return self
def next(self):
if self._next is not None:
cur = self._next
else:
cur = self._f.readline()
if not cur:
raise StopIteration
self._next = None
self._prev = cur
return cur
def Rewind(self):
assert self._prev is not None
self._next = self._prev
self._prev = None
def _ReadHunks(buf):
for line in buf:
if not line.startswith('@@'):
break
base = int(line.split()[2].split(',')[0])
for offset in _ReadHunkBody(buf):
yield base + offset
def _ReadHunkBody(buf):
n = 0
for line in buf:
prefix = line[0]
if prefix == ' ':
n += 1
elif prefix == '+':
yield n
n += 1
elif prefix != '-' or line.startswith('---'):
buf.Rewind()
break
def main():
buf = _LineBuffer(sys.stdin)
for line in buf:
if line.startswith('+++'):
filename = line.split()[1]
for n in _ReadHunks(buf):
print '{}:{}'.format(filename, n)
if __name__ == '__main__':
main()