move setup.cfg to pyproject.toml

.flake8

@@ -0,0 +1,49 @@
+[flake8]
+# References:
+#   https://flake8.readthedocs.io/en/latest/user/configuration.html
+#   https://flake8.readthedocs.io/en/latest/user/error-codes.html
+#   https://pycodestyle.readthedocs.io/en/latest/intro.html#error-codes
+
+max-line-length = 80
+max-complexity = 50
+select = C,E,F,W,B,B950
+ignore =
+    # E203: whitespace before ':'
+    E203,
+    # E226: missing whitespace around arithmetic operator
+    E226,
+    # E231: missing whitespace after ',', ';', or ':'
+    E231,
+    # E402: module level imports on one line
+    E402,
+    # E501: line too long
+    E501,
+    # E731: do not assign a lambda expression, use a def
+    E731,
+    # W503: line break before binary operator
+    W503,
+    # W504: line break after binary operator
+    W504,
+exclude =
+    #
+    # ignore the following directories
+    #
+    .eggs,
+    build,
+    docs/src/sphinxext/*,
+    tools/*,
+    benchmarks/*,
+    #
+    # ignore auto-generated files
+    #
+    _ff_cross_refrences.py,
+    std_names.py,
+    um_cf_map.py,
+    #
+    # ignore third-party files
+    #
+    gitwash_dumper.py,
+    #
+    # convenience imports
+    #
+    lib/iris/common/__init__.py

.pre-commit-config.yaml

@@ -47,7 +47,6 @@ repos:
     hooks:
     -   id: flake8
         types: [file, python]
-        args: [--config=./setup.cfg]
 
 -   repo: https://github.com/pycqa/isort
     rev: 5.12.0

lib/iris/tests/test_coding_standards.py

@@ -79,7 +79,7 @@ def test_python_versions():
     benchmarks_dir = root_dir / "benchmarks"
 
     # Places that are checked:
-    setup_cfg_file = root_dir / "setup.cfg"
+    pyproject_toml_file = root_dir / "pyproject.toml"
     requirements_dir = root_dir / "requirements"
     nox_file = root_dir / "noxfile.py"
     ci_wheels_file = workflows_dir / "ci-wheels.yml"
@@ -89,10 +89,10 @@ def test_python_versions():
 
     text_searches: List[Tuple[Path, str]] = [
         (
-            setup_cfg_file,
+            pyproject_toml_file,
             "\n    ".join(
                 [
-                    "Programming Language :: Python :: " + ver
+                    f'"Programming Language :: Python :: {ver}",'
                     for ver in all_supported
                 ]
             ),

pyproject.toml

@@ -8,6 +8,74 @@ requires = [
 # Defined by PEP 517
 build-backend = "setuptools.build_meta"
 
+[project]
+authors = [
+    {name = "Iris Contributors", email = "[email protected]"}
+]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
+    "Operating System :: MacOS",
+    "Operating System :: POSIX",
+    "Operating System :: POSIX :: Linux",
+    "Operating System :: Unix",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Topic :: Scientific/Engineering",
+    "Topic :: Scientific/Engineering :: Atmospheric Science",
+    "Topic :: Scientific/Engineering :: Visualization",
+]
+dynamic = [
+    "dependencies",
+    "optional-dependencies",
+    "readme",
+    "version",
+]
+description = "A powerful, format-agnostic, community-driven Python package for analysing and visualising Earth science data"
+keywords = [
+    "cf-metadata",
+    "data-analysis",
+    "earth-science",
+    "grib",
+    "netcdf",
+    "meteorology",
+    "oceanography",
+    "space-weather",
+    "ugrid",
+    "visualisation",
+]
+license = {text = "LGPL-3.0-or-later"}
+name = "scitools-iris"
+requires-python = ">=3.8"
+
+[project.urls]
+Code = "https://github.com/SciTools/iris"
+Discussions = "https://github.com/SciTools/iris/discussions"
+Documentation = "https://scitools-iris.readthedocs.io/en/stable/"
+Issues = "https://github.com/SciTools/iris/issues"
+
+[tool.setuptools]
+license-files = ["COPYING", "COPYING.LESSER"]
+zip-safe = false
+
+[tool.setuptools.dynamic]
+dependencies = {file = "requirements/core.txt"}
+readme = {file = "README.md", content-type = "text/markdown"}
+
+[tool.setuptools.dynamic.optional-dependencies]
+dev = {file = "requirements/optional-dev.txt"}
+docs = {file = "requirements/optional-docs.txt"}
+test = {file = "requirements/optional-test.txt"}
+
+[tool.setuptools.packages.find]
+include = ["iris*"]
+where = ["lib"]
+
 [tool.setuptools_scm]
 write_to = "lib/iris/_version.py"
 local_scheme = "dirty-tag"

requirements/core.txt

@@ -0,0 +1,10 @@
+cartopy>=0.21
+cf-units>=3.1
+cftime>=1.5.0
+dask[array]>=2022.9.0
+matplotlib>=3.5
+netcdf4
+numpy>=1.19
+scipy
+shapely!=1.8.3
+xxhash

requirements/optional-dev.txt

@@ -0,0 +1,4 @@
+nc-time-axis>=1.4
+pandas
+pre-commit
+stratify

requirements/optional-docs.txt

@@ -0,0 +1,6 @@
+sphinx<=5.3
+sphinx-copybutton
+sphinx-gallery>=0.11.0
+sphinxcontrib-napoleon
+sphinx-design
+pydata-sphinx-theme>=0.13.0

requirements/optional-test.txt

@@ -0,0 +1,5 @@
+filelock
+imagehash>=4.0
+requests
+pytest
+pytest-xdist