packaging: migrate to declarative setup.cfg

[deronnax]

declarative setup.cfg are superior to imperative setup.py.

I added a minimalist tox.ini. I took the initiative to change what's in the long description: CHANGES.rst is not appended anymore to the README.

[gforcada]

@deronnax thanks a lot for spending the time improving flake8-isort!! 🎉 🙇🏾

Though, if we are moving out of setup.py I would move straight to pyproject.toml which is the blessed file for managing projects. Fortunately setup.cfg and pyproject.toml don't differ too much one from the other 🤞🏾

See https://packaging.python.org/en/latest/tutorials/packaging-projects/#creating-pyproject-toml

Adding a tox.ini sounds great 🌟 but unfortunately I do like to have CHANGES.rst appended, so within a first glance on PyPI I can see what were the changes made on the distribution recently.

I would be all fine and understandable that these requested changes above are too much, I could do them myself if you want 😄

[deronnax]

@gforcada no worries, I will soon come back with all your requests addressed. Hold on.

[gforcada]

Cool, thanks! 🙇🏾

I will slightly adapt it to follow the other flake8 plugins I'm maintaining, but that's almost all the work done with this PR! 🌟

[deronnax]

Hey, thank you for the merge, I had not integrated one change you asked for : the appending of changes.rst to the readme.rst, because you have to fiddle a bit the pyproject.toml to get it.
If you really want (which I still advice against, but you do you), apply this diff:

--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ authors = [{ name = "Gil Forcada", email = "gil.gnome@gmail.com" }]
 license = { text = "GPL version 2" }
 description = "flake8 plugin that integrates isort ."
 keywords = ["pep8", "flake8", "python", "isort", "imports"]
-readme = "README.rst"
+dynamic = ["readme"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Environment :: Console",
@@ -33,6 +33,9 @@ urls = { Homepage = "https://github.com/gforcada/flake8-isort" }
 requires-python = ">=3.8"
 dependencies = ["flake8", "isort >= 5.0.0, <6"]
 
+[tool.setuptools.dynamic]
+readme = { file = ["README.rst", "CHANGES.rst"] }
+
 [project.entry-points]
 "flake8.extension" = { I00 = "flake8_isort:Flake8Isort" }

There you go. Have a good day :)

[gforcada]

@deronnax Thanks for the patch! 🌟 but given that PyPI now has the URLs structure where you can provide a link to the ChangeLog, I would say that it is solved 😄

I also moved away from setuptools and I'm using hatchling now 🍀