Remove metadata.json from the generated files in .dist-info

[agronholm]

As PEP 426 was never accepted, I don't feel like we should generate this file anymore in the .dist-info directory in the wheel file.

[agronholm]

This should also resolve #75.

[tuukkamustonen]

PEP 426 is actually deferred, not rejected, so it doesn't hurt to have metadata.json there.

However, chances are that the format will actually change before (and if) it gets approved, so in that regard removing metadata.json would be ok, I guess.

[wimglenn]

Whoops, I was using this dist-info json for various automation stuff and it all broke after wheel 0.31 release. What's the machine-readable replacement now? Do we have to parse that METADATA?

[di]

@wimglenn You can either use the pkginfo project or just do what it does and parse METADATA directly:

>>> from email.parser import Parser
>>> meta = Parser().parse(open('METADATA'))
>>> meta.items()
# List of key/value tuples
>>> meta.get_payload()
# Description contents

[wimglenn]

@di will give it a shot, thanks!

[cyrilleverrier]

For reference, Jfrog Artifactory relies on metadata.json file to read the meta data.
A ticket has been opened: https://www.jfrog.com/jira/browse/RTFACT-16360 (marked as dup of internal bug)
The issue has not been fixed yet by Artifactory.

Workaround: downgrade wheel to 0.30.0