Improve editable installs

[sdispater]

Pull Request Check List

Resolves: #730
Resolves: #2079
Resolves: #2126
Resolves: #2225
Resolves: #2324

• Added tests for changed code.
• Updated documentation for changed code.

This PR improves and makes proper use of the EditableBuilder.

This change affects the install command in two ways:

• The root project will now be installed much faster by no longer relying on generating a setup.py file.
• The Poetry packages that needs to be installed in editable mode, via Poetry, will also skip the setup.py step.

For the details of how it's done:

• It creates a .pth file in the site-packages (purelib) directory of the current environment which points to the absolute path of the current project.
• It creates a .dist-info directory with the INSTALLER, METADATA, RECORD and entry_points.txt files.
• It creates the appropriate console scripts (entry points).

I took this opportunity to improve the installed packages detection by improving the detection of the purelib directory which was not so trivial after all.

[PetterS]

@sdispater @abn

The latest Poetry on develop now fails (when running poetry install) on my code base for my editable install with the following message:

  AttributeError

  'Package' object has no attribute 'build_script'

  at /usr/local/lib/python3.6/dist-packages/poetry/packages/dependency_package.py:18 in __getattr__
      14|     def clone(self):  # type: () -> DependencyPackage
      15|         return self.__class__(self._dependency, self._package.clone())
      16|
      17|     def __getattr__(self, name):
    > 18|         return getattr(self._package, name)
      19|
      20|     def __setattr__(self, key, value):
      21|         if key in {"_dependency", "_package"}:
      22|             return super(DependencyPackage, self).__setattr__(key, value)

Perhaps related to this PR?

Poetry does not print the full stack trace so I don't have more information than this.

[sdispater]

@PetterS Thanks for pointing this out.

I stumbled upon this issue this week-end myself and I already have a fix for it that I need to test before making a pull request.

I'll let you know when it's ready.

[PetterS]

Cheers! 👍

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