feat: export cross-platform requirements

[frostming]

Signed-off-by: Frost Ming [email protected]

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

[codecov]

Codecov Report

Attention: 23 lines in your changes are missing coverage. Please review.

Comparison is base (3d67092) 84.40% compared to head (b909158) 84.41%.
Report is 1 commits behind head on dev.

Files	Patch %	Lines
src/pdm/models/markers.py	80.26%	11 Missing and 4 partials ⚠️
src/pdm/resolver/graph.py	90.00%	4 Missing and 2 partials ⚠️
src/pdm/formats/pipfile.py	66.66%	1 Missing ⚠️
src/pdm/models/repositories.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2418      +/-   ##
==========================================
+ Coverage   84.40%   84.41%   +0.01%     
==========================================
  Files         102      104       +2     
  Lines       10131    10173      +42     
  Branches     2229     2226       -3     
==========================================
+ Hits         8551     8588      +37     
- Misses       1106     1111       +5     
  Partials      474      474              

Flag	Coverage Δ
unittests	84.21% <87.63%> (+0.01%)	⬆️

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[deronnax]

Hey, we actually appreciated (and used) the previous requirement (snyk does not understands platform markers). Would it be doable to add an option to export following the previous behavior?
Thank you.

[frostming]

(snyk does not understands platform markers)

That is quite surprising, does it mean it only understands the output of pip freeze?

[deronnax]

I think so. I re-did the test various time and I confirm snyk does not understand platform markers. I can provide use case if you want.