#!/usr/bin/env python

from __future__ import print_function

import difflib

import sys

with open(sys.argv[1], 'r') as f:

origin = f.read()

origin = origin.splitlines()

with open(sys.argv[2], 'r') as f:

new = f.read()

new = new.splitlines()

differ = difflib.Differ()

result = differ.compare(origin, new)

error = False

diffs = []

for each_diff in result:

if each_diff[0] in ['-', '?']: # delete or change API is not allowed

error = True

elif each_diff[0] == '+':

error = True

if each_diff[0] != ' ':

diffs.append(each_diff)

'''

If you modify/add/delete the API files, including code and comment,

please follow these steps in order to pass the CI:

1. cd ${paddle_path}, compile paddle;

2. pip install build/python/dist/(build whl package);

3. run "python tools/print_signatures.py paddle.fluid> paddle/fluid/API.spec"

'''

if error:

print('API Difference is: ')

for each_diff in diffs:

print(each_diff)