Switch to flit

.flake8

@@ -0,0 +1,17 @@
+[flake8]
+ignore = E501, W503, E402
+builtins = c, get_config
+exclude =
+    .cache,
+    .github,
+    docs,
+    setup.py
+enable-extensions = G
+extend-ignore =
+    G001, G002, G004, G200, G201, G202,
+    # black adds spaces around ':'
+    E203,
+per-file-ignores =
+    # B011: Do not call assert False since python -O removes these calls
+    # F841 local variable 'foo' is assigned to but never used
+    jupyter_releaser/tests/*: B011, F841

pyproject.toml

@@ -1,9 +1,60 @@
 [build-system]
-requires = ["setuptools>=40.8.0", "wheel"]
-build-backend = "setuptools.build_meta"
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
 
-[tool.check-manifest]
-ignore = ["tbump.toml", ".*", "codecov.yml"]
+[project]
+name = "jupyter_releaser"
+description = "Jupyter Releaser for Python and/or npm packages."
+license = {text = "BSD 3-Clause License"}
+authors = [{name = "Jupyter Development Team", email = "[email protected]"}]
+keywords = ["ipython", "jupyter"]
+classifiers = [
+    "Intended Audience :: Developers",
+    "Intended Audience :: System Administrators",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: BSD License",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+]
+urls = {Homepage = "https://jupyter.org"}
+requires-python = ">=3.8"
+dependencies = [
+    "build",
+    "check-manifest",
+    "click",
+    "ghapi",
+    "github-activity~=0.2",
+    "importlib_resources",
+    "jsonschema>=3.0.1",
+    "packaging",
+    "pkginfo",
+    "pre-commit",
+    "pypiserver",
+    "pytest-check-links>=0.7",
+    "requests",
+    "requests_cache",
+    "tbump~=6.7",
+    "toml~=0.10",
+    "twine",
+]
+dynamic = ["version"]
+
+[project.readme]
+file = "README.md"
+content-type = "text/markdown"
+
+[project.optional-dependencies]
+test = [
+    "coverage",
+    "pytest>=7.0",
+    "pytest-cov",
+    "pytest-mock",
+]
+
+[project.scripts]
+jupyter-releaser = "jupyter_releaser.cli:main"
 
 [tool.tbump.version]
 current = "0.19.0"