def get_pypi_dependencies(package_name, calls=0):
""" Return the list of dependencies of the given package name.
How does it do this?
- Check if the package is installed with pkg_resources.
- If it's not installed, install it.
- Check with pkg_resources again.
- If it's not installed, give up.
- If it is installed, use the pkg_resources module to find its
dependencies, and their dependencies, and so on.
"""
if calls > 2:
raise Exception("I tried installing %s %i times. Fail." %
(package_name, calls))
try:
return [
r.project_name for r in
pkg_resources.get_distribution(package_name).requires()
]
except pkg_resources.DistributionNotFound as e:
pipsupport.install_distributions([package_name])
return get_pypi_dependencies(package_name, calls + 1)
