[Distutils] Proposal: "Install and save"

[Wes Turner]

pipup has "save to a requirements.txt" functionality
https://github.com/revsys/pipup

It looks like it doesn't yet handle hash-checking mode (which is from peep,
IIRC):

- https://pip.pypa.io/en/stable/reference/pip_install/#hash-checking-mode
- https://github.com/revsys/pipup/blob/master/pipup/req_files.py

I think str(req_install.InstallRequirement) could/should just work? Or
maybe to_requirements_str()?
- https://github.com/pypa/pip/blob/master/pip/req/req_file.py
- https://github.com/pypa/pip/blob/master/pip/req/req_install.py

pip-tools probably has InstallRequirement.to_requirements_str()?

- https://github.com/nvie/pip-tools/blob/master/piptools/writer.py
- https://github.com/nvie/pip-tools/blob/master/piptools/utils.py
 - format_requirement()
 - format_specifier()

Round-trip with requirements.txt files would probably be useful

On Sunday, July 24, 2016, Brett Cannon <brett at python.org> wrote:

>
>
> On Sat, 23 Jul 2016 at 10:36 Daniel Holth <dholth at gmail.com
> <javascript:_e(%7B%7D,'cvml','dholth at gmail.com');>> wrote:
>
>> Not yet. Someone should fix that 😎
>>
> There is an issue tracking that if someone gets adventurous enough to
> write up a PR: https://github.com/pypa/pip/issues/3691 .
>
> -Brett
>
>
>>
>> On Sat, Jul 23, 2016, 11:37 Alex Grönholm <alex.gronholm at nextday.fi
>> <javascript:_e(%7B%7D,'cvml','alex.gronholm at nextday.fi');>> wrote:
>>
>>> pip doesn't yet support pyproject.toml does it?
>>>
>>>
>>> 23.07.2016, 17:43, Daniel Holth kirjoitti:
>>>
>>> Here is my attempt. The SConstruct (like a Makefile) builds the
>>> extension. The .toml file gives the static metadata. No need to put the two
>>> in the same file.
>>>
>>> https://bitbucket.org/dholth/cryptacular/src/tip/SConstruct
>>>
>>> https://bitbucket.org/dholth/cryptacular/src/tip/pyproject.toml
>>>
>>> On Sat, Jul 23, 2016 at 10:11 AM Alex Grönholm <alex.gronholm at nextday.fi
>>> <javascript:_e(%7B%7D,'cvml','alex.gronholm at nextday.fi');>> wrote:
>>>
>>>> 23.07.2016, 17:04, Thomas Kluyver kirjoitti:
>>>> > On Sat, Jul 23, 2016, at 02:32 PM, Alex Grönholm wrote:
>>>> >> I'm -1 on this because requirements.txt is not really the standard
>>>> way
>>>> >> to list dependencies.
>>>> >> In the Python world, setup.py is the equivalent of Node's
>>>> package.json.
>>>> >> But as it is
>>>> >> Python code, it cannot so easily be programmatically modified.
>>>> > Packaging based on declarative metadata:
>>>> > http://flit.readthedocs.io/en/latest/
>>>> > </blowing_own_trumpet>
>>>> >
>>>> > We have a bit of a divide. Specifying dependencies in setup.py (or
>>>> > flit.ini, or upcoming pyproject.toml) is the standard for library and
>>>> > tool packages that are intended to be published on PyPI and installed
>>>> > with pip. requirements.txt is generally used for applications which
>>>> will
>>>> > be distributed or deployed by other means.
>>>> >
>>>> > As I understand it, in the Javascript world package.json is used in
>>>> both
>>>> > cases. Is that something Python should try to emulate? Is it hard to
>>>> > achieve given the limitations of setup.py that you pointed out?
>>>> This topic has been beaten to death. There is no way to cram the
>>>> complexities of C extension compilation setup into purely declarative
>>>> metadata. Distutils2 tried and failed. Just look at the setup.py files
>>>> of some popular projects and imagine all that logic expressed in
>>>> declarative metadata.
>>>> > Thomas
>>>> > _______________________________________________
>>>> > Distutils-SIG maillist  -  Distutils-SIG at python.org
>>>> <javascript:_e(%7B%7D,'cvml','Distutils-SIG at python.org');>
>>>> > https://mail.python.org/mailman/listinfo/distutils-sig
>>>>
>>>> _______________________________________________
>>>> Distutils-SIG maillist  -  Distutils-SIG at python.org
>>>> <javascript:_e(%7B%7D,'cvml','Distutils-SIG at python.org');>
>>>> https://mail.python.org/mailman/listinfo/distutils-sig
>>>>
>>>
>>> _______________________________________________
>> Distutils-SIG maillist  -  Distutils-SIG at python.org
>> <javascript:_e(%7B%7D,'cvml','Distutils-SIG at python.org');>
>> https://mail.python.org/mailman/listinfo/distutils-sig
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>
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