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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.
Ignore empty lines, comments and editable requirements
:param str file_path: path to requirements file
:returns: mapping from a project to its pinned version
:rtype: dict
"""
data = {}
with open(file_path) as file_h:
for line in file_h:
line = line.strip()
if line and not line.startswith('#') and not line.startswith('-e'):
project, version = line.split('==')
if not version:
raise ValueError("Unexpected syntax '{0}'".format(line))
data[project] = version
return data
def output_requirements(requirements):
"""Prepare print requirements to stdout.
:param dict requirements: mapping from a project to its pinned version
"""
return '\n'.join('{0}=={1}'.format(key, value)
for key, value in sorted(requirements.items()))
def main(*paths):
"""Merges multiple requirements files together and prints the result.
Requirement files specified later in the list take precedence over earlier
files.
:param tuple paths: paths to requirements files
"""
data = {}
for path in paths:
data.update(read_file(path))
return output_requirements(data)
if __name__ == '__main__':
print(main(*sys.argv[1:])) # pylint: disable=star-args
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