On Thu, Mar 19, 2015 at 7:12 AM, Daniel Holth <dho...@gmail.com> wrote:
> So I'd like to suggest the following series of small improvements to both > pip and setuptools: > > * setuptools: `python setup.py setup_requires` dumps its setup_requires > keyword in 'requirements.txt' format > > It's is already in this format, so should be trivial, but allows one to do > something like: > > $ python setup.py setup_requires > setup_requires.txt > $ pip install -r setup_requires.txt > > Or in one bash line: > > $ pip install -r <( python setup.py setup_requires ) > A way of learning about setup_requires dependencies would be helpful for homebrew-pypi-poet [1], which helps generate Homebrew formulae for applications implemented in Python. Homebrew prefers to specify all dependencies explicitly in the formula rather than allowing easy_install or pip to perform dependency resolution at formula install time. [2] We use installed metadata to learn about install_requires dependencies but setup_requires dependencies aren't captured AFAIK (are they?) so formula authors have to identify those by hand. This isn't critically painful for me but I thought it was an interesting example use case. Tim [1] https://github.com/tdsmith/homebrew-pypi-poet [2] As Chris Barker notes, --single-version-externally-managed is a good way to get setuptools-based setup.py's to just install the package; --single-version-externally-managed hands the install process over to distutils. Of course, distutils setup.py's do not support the --single-version-externally-managed option. To have a consistent CLI interface, Homebrew borrows a shim from pip's source to make sure we always call setuptools.setup() when we run setup.py so that we can hand the install back to distutils: https://github.com/Homebrew/homebrew/blob/master/Library/Homebrew/language/python.rb#L78-L94 -- thanks to Donald for pointing to the right place in the pip code.
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