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import argparse
import pkg_resources
try:
# pip < 20
from pip._internal.req import parse_requirements
from pip._internal.download import PipSession
except:
# pip >= 20
from pip._internal.req import parse_requirements
from pip._internal.network.session import PipSession
def combine_requirements(requirements):
name = requirements[0].project_name
specs = []
for req in requirements:
if len(req.specs) == 0:
continue
specs.extend([s[0] + s[1] for s in req.specs])
return name + ",".join(specs)
def get_dependencies(packages):
requirements = []
for package in packages:
package_info = pkg_resources.working_set.by_key[package]
applicable_requirements = [r for r in package_info.requires() if r.marker is None or r.marker.evaluate()]
requirements.extend(applicable_requirements)
return requirements
if __name__ == "__main__":
parser = argparse.ArgumentParser(
description="List dependencies for a given requirements.txt file"
)
parser.add_argument(
"-r",
"--requirements",
dest="requirements_file",
help="File containing list of packages for which to find dependencies",
required=True
)
args = parser.parse_args()
# Get package names from requirements.txt
requirements = parse_requirements(args.requirements_file, session=PipSession())
package_names = [item.req.name for item in requirements]
dependencies = get_dependencies(package_names)
# It may be the case that packages have multiple sets of dependency
# requirements, for example:
# Package A requires Foo>=1.0.0,<2.0.0
# Package B requires Foo>=1.0.0,<1.2.3
# This combines all required versions into one string for pip to resolve
# Output: Foo>=1.0.0,<2.0.0,>=1.0.0,<1.2.3
# Pip parses this value using the Requirement object (https://setuptools.readthedocs.io/en/latest/pkg_resources.html#requirement-objects)
# According to https://packaging.python.org/glossary/#term-requirement-specifier
grouped_dependencies = {}
for dep in dependencies:
if dep.key in grouped_dependencies:
grouped_dependencies[dep.key].append(dep)
else:
grouped_dependencies[dep.key] = [dep]
final_dependencies = [combine_requirements(r) for r in grouped_dependencies.values()]
print("\n".join(final_dependencies))
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