pyproject: nuke setup.py

Requires setuptools >= 61, which is when PEP 621 (Storing project
metadata in pyproject.toml) support was added. For convenience,
setuptools 66.1.1 will soon exist in Debian's bullseye-backports.

This also requires a newer pip, with support for PEP 660 (Editable
installs for pyproject.toml based builds) in the tox dev environment.

Author: paravoid

README.md

@@ -49,8 +49,7 @@ Python 3.9+, plus the following modules from PyPI or your distribution:
 The software is currently self-contained in a single Python file, so running it from the cloned directory should work,
 provided the necessary libraries above are also present.
 
-A standard `pyproject.toml` using setuptools as the build system, as well as a
-legacy `setup.py` are provided as well.
+A standard `pyproject.toml` using setuptools as the build system is provided as well.
 
 # Copyright and license
 

debian/control

@@ -7,7 +7,7 @@ Build-Depends:
  dh-sequence-python3,
  pybuild-plugin-pyproject,
  python3-all,
- python3-setuptools,
+ python3-setuptools (>= 61),
 Standards-Version: 4.6.2
 Homepage: https://github.com/paravoid/ircstream
 X-Python3-Version: >= 3.9

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=45"]
+requires = ["setuptools>=61"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]

setup.py

@@ -1,9 +1,12 @@
 [tox]
 envlist = py{39,311}, py39-bullseye, py311-bookworm, type, lint, coverage
 skip_missing_interpreters = true
+# require newer pip with PEP 660 support
+requires =
+    pip>=21.3.1
 
 [main]
-source = ircstream.py setup.py tests/
+source = ircstream.py tests/
 
 [testenv]
 usedevelop = True