Refactored the wheel convert command to not require setuptools (#640)

This also aims to improve the correctness of the egg and bdist_wininst conversions.

.pre-commit-config.yaml

@@ -14,8 +14,8 @@ repos:
   - id: end-of-file-fixer
   - id: mixed-line-ending
     args: ["--fix=lf"]
-  - id: requirements-txt-fixer
   - id: trailing-whitespace
+    exclude: "tests/cli/test_convert.py"
 
 - repo: https://github.com/astral-sh/ruff-pre-commit
   rev: v0.6.9

docs/news.rst

@@ -3,6 +3,7 @@ Release Notes
 
 **UNRELEASED**
 
+- Refactored the ``convert`` command to not need setuptools to be installed
 - Added a redirection from ``wheel.bdist_wheel.bdist_wheel`` to
   ``setuptools.command.bdist_wheel.bdist_wheel`` to improve compatibility with
   ``setuptools``' latest fixes.

pyproject.toml

@@ -6,6 +6,7 @@ build-backend = "flit_core.buildapi"
 name = "wheel"
 description = "A built-package format for Python"
 readme = "README.rst"
+license = {file = "LICENSE.txt"}
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
@@ -89,6 +90,9 @@ exclude_also = [
 
 [tool.coverage.report]
 show_missing = true
+exclude_also = [
+    "@abstractmethod",
+]
 
 [tool.ruff]
 extend-exclude = ["src/wheel/vendored"]