make-declarative.py

from __future__ import print_function
import sys
import tokenize

_is_declarative = True
with (getattr(tokenize, 'open', open))('setup.py') as setup_py:
    _lines = []
    for line in setup_py:
        if _is_declarative and line.strip() not in ['import setuptools', 'from setuptools import setup', 'setup()', '']:
            _is_declarative = False
        _lines.append(line)
if _is_declarative:
    sys.exit(0)

import setuptools

# Hacky! But we can't keep __name__ == '__main__' with distutils.core.run_setup :(
setuptools.distutils.core._setup_stop_after = 'config'

__file__='setup.py'

sys.argv = [ __file__ ]

# Taken from nixpkgs run_setup.py, in turn taken from pip
exec(compile(''.join(_lines), __file__, 'exec'))

cfg = setuptools.distutils.core._setup_distribution

print("[metadata]")
print("name = %(name)s" % { 'name': cfg.metadata.name })
print("version = %(version)s\n" % { 'version': cfg.metadata.version })

print("[options]")

def print_list(name, deps):
    if deps:
        print("%(name)s =" % { 'name': name })
        for dep in deps:
            print("  %(dep)s" % { 'dep': dep })

print_list("install_requires", cfg.install_requires)
print_list("setup_requires", cfg.setup_requires)
print_list("tests_require", cfg.tests_require)