⚡ Prepare for metadata-only resolves

[ddelange]

With a lot of excitement, adding support for pip's new --dry-run --report functionality.

With this PR, a wheel download is no longer necessary if:

• The project in question uploads wheels compatible with your system.
  • If they only upload a source distribution (.tar.gz), or there are no compatible wheels, pip has no other choice than to build the wheel (run setup.py).
• The project in question uploaded those wheels after ~ June 2023, the time of rollout of PEP 658 metadata generation and serving on PyPI (a backfill for older wheels is planned ref cache metadata lookups for sdists and lazy wheels pypa/pip#12256 (comment)). The backfill was completed ref ref Expose the METADATA file of wheels in the simple API pypi/warehouse#8254 (comment)
• pull preparer logic out of the resolver to consume metadata-only dists in commands pypa/pip#12186 is merged and released.
  • Current pip (23.2.1) will still unnecessarily download the wheel when there's metadata available. That PR will bring the full speed-up of not having to download wheels anymore for wheels uploaded to PyPI after the relevant changes were deployed on warehouse side.
  • Try it out now:

  $ pip install 'pip @ https://github.com/cosmicexplorer/pip/archive/refs/heads/metadata_only_resolve_no_whl.zip'
  $ pipgrip tensorflow
  

Closes #40 🎉

[codecov-commenter]

Codecov Report

Patch coverage: 57.69% and project coverage change: -0.28% ⚠️

Comparison is base (812db2b) 78.16% compared to head (cc4f9d5) 77.88%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
- Coverage   78.16%   77.88%   -0.28%     
==========================================
  Files          29       29              
  Lines        2807     2831      +24     
  Branches      789      794       +5     
==========================================
+ Hits         2194     2205      +11     
- Misses        440      448       +8     
- Partials      173      178       +5     

Files Changed	Coverage Δ
src/pipgrip/pipper.py	78.08% <57.69%> (-2.53%)	⬇️

... and 1 file with indirect coverage changes

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[github-actions]

Released 0.10.5

[LanYuqiao]

Does that mean pipgrip won't fetch and build wheel from now on?

[ddelange]

Hi @LanYuqiao 👋

Yes, with a few prerequisites:

edit: moved to PR description

[LanYuqiao]

@ddelange Thanks for the works! That's a great job:->👍

[LanYuqiao]

And I think the main page README should update the fetch/build description

[ddelange]

True, I'll update the README once the pip PR merges!