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#!/usr/bin/env python
"""Merges multiple Python requirements files into one file.
Requirements files specified later take precedence over earlier ones. Only
simple SomeProject==1.2.3 format is currently supported.
"""
from __future__ import print_function
import sys
def read_file(file_path):
"""Reads in a Python requirements file.
:param str file_path: path to requirements file
:returns: mapping from a project to its pinned version
:rtype: dict
"""
d = {}
with open(file_path) as f:
for line in f:
line = line.strip()
if line and not line.startswith('#'):
project, version = line.split('==')
if not version:
raise ValueError("Unexpected syntax '{0}'".format(line))
d[project] = version
return d
def print_requirements(requirements):
"""Prints requirements to stdout.
:param dict requirements: mapping from a project to its pinned version
"""
print('\n'.join('{0}=={1}'.format(k, v)
for k, v in sorted(requirements.items())))
def merge_requirements_files(*files):
"""Merges multiple requirements files together and prints the result.
Requirement files specified later in the list take precedence over earlier
files.
:param tuple files: paths to requirements files
"""
d = {}
for f in files:
d.update(read_file(f))
print_requirements(d)
if __name__ == '__main__':
merge_requirements_files(*sys.argv[1:])
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