Three Dollar Quill

Checking over the motrfile to see which bugs I should write up...

• Move wheel creation code into core.
• Move requirements file creation code into core.
• Figure out how to lift operations on the underlying type into the context of the Input wrapper.
• Move project package code into core.
• Move path utility function into core.
• Create helpers for generating sets of project packages.
• Move make_parent helper into core and evaluate the possibility of using it with write_bytes.
• Rewrite virtualenv creation code (including pip calls) to use the Fragment API.
• Eliminate usage of venv module.
• Eliminate direct references to Flit.
• Rework the RuntimeAction interface to take a callback to register output streams.
• Rewrite pytest calls to use the Fragment API.
• Rewrite flake8 call to use the Fragment API.
• Rewrite mypy call to use the Fragment API.
• Rewrite coverage calls to use the Fragment API.
• Rewrite pyinstrument calls to use the Fragment API.

That's going to give me plenty to chew on. I'll enter that in after I publish this.

I'm not going to try to write any more; I just want to wrap things up quickly.

Good night.