build: Migrate build to use hatchling (#241)

* Use hatchling and hatch-vcs as build system.
   - Done mostly automatically with 'hatch new --init'.
* Remove setuptools and related files from repository.
   - Remove setup.py, setup.cfg, MANIFEST.in.
   - Remove check-manifest from 'develop' extra.
* Remove setuptools install from CI.
* Remove check-manifest checks from CI.
* Add .flake8 file as flake8 doesn't support pyproject.toml.

.flake8

@@ -0,0 +1,7 @@
+[flake8]
+# E501: line too long
+extend-ignore = E501
+max-line-length = 88
+max-complexity = 18
+count = True
+statistics = True

.github/workflows/bump-version.yml

@@ -186,7 +186,7 @@ jobs:
     - name: Install Python dependencies
       run: |
         python -m pip install uv
-        uv pip install --system --upgrade pip setuptools wheel
+        uv pip install --system --upgrade pip wheel
         uv pip install --system tbump
         python -m pip list
 

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install uv
-        uv pip install --system --upgrade pip setuptools wheel
+        uv pip install --system --upgrade pip wheel
         uv pip install --system --quiet '.[test]'
         python -m pip list
 

.github/workflows/lint.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install uv
-        uv pip install --system --upgrade pip setuptools wheel
+        uv pip install --system --upgrade pip wheel
         uv pip install --system --quiet '.[lint]'
         python -m pip list
 

.github/workflows/publish-package.yml

@@ -38,17 +38,13 @@ jobs:
       with:
         python-version: '3.12'
 
-    - name: Install python-build, check-manifest, and twine
+    - name: Install python-build, and twine
       run: |
         python -m pip install uv
-        uv pip install --system --upgrade pip setuptools wheel
-        uv pip install --system build check-manifest twine
+        uv pip install --system --upgrade pip wheel
+        uv pip install --system build twine
         python -m pip list
 
-    - name: Check MANIFEST
-      run: |
-        check-manifest
-
     - name: Build a sdist and a wheel
       run: |
         python -m build .

docker/Dockerfile

@@ -12,7 +12,7 @@ RUN apt-get -qq -y update && \
     rm -rf /var/lib/apt-get/lists/* && \
     cd /code && \
     python -m pip install uv && \
-    uv pip install --system --upgrade --no-cache pip setuptools wheel && \
+    uv pip install --system --upgrade --no-cache pip wheel && \
     uv pip install --system --no-cache . && \
     python -m pip list
 

pyproject.toml

@@ -1,12 +1,93 @@
 [build-system]
-# Minimum requirements for the build system to execute.
-requires = ["setuptools>=42", "setuptools_scm[toml]>=3.4"]
-build-backend = "setuptools.build_meta"
+requires = [
+    "hatchling>=1.13.0",
+    "hatch-vcs>=0.3.0",
+]
+build-backend = "hatchling.build"
+
+[project]
+name = "pylhe"
+dynamic = ["version"]
+description = "A small package to get structured data out of Les Houches Event files"
+readme = "README.md"
+license = { text = "Apache-2.0" }  # SPDX short identifier
+requires-python = ">=3.8"
+authors = [
+    { name = "Lukas Heinrich", email = "[email protected]" },
+    { name = "Matthew Feickert", email = "[email protected]" },
+    { name = "Eduardo Rodrigues", email = "[email protected]" },
+]
+maintainers = [ {name = "The Scikit-HEP admins", email = "[email protected]"} ]
+keywords = [
+    "lhe",
+    "physics",
+]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: Apache Software License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Topic :: Scientific/Engineering",
+    "Topic :: Scientific/Engineering :: Physics",
+]
+dependencies = [
+    "awkward>=1.2.0",
+    "graphviz>=0.12.0",
+    "particle>=0.16",
+    "vector>=0.8.1",
+]
+
+[project.optional-dependencies]
+lint = [
+    "black",
+    "flake8",
+]
+test = [
+    "pydocstyle",
+    "pytest-cov>=2.5.1",
+    "pytest>=6.0",
+    "scikit-hep-testdata>=0.4.36",
+]
+develop = [
+    "pyhf[lint,test]",
+    "pre-commit",
+    "tbump>=6.7.0",
+]
+
+[project.urls]
+Homepage = "https://github.com/scikit-hep/pylhe"
+"Source Code" = "https://github.com/scikit-hep/pylhe"
+"Issue Tracker" = "https://github.com/scikit-hep/pylhe/issues"
+"Releases" = "https://github.com/scikit-hep/pylhe/releases"
+
+[tool.hatch.version]
+source = "vcs"
 
-[tool.setuptools_scm]
-write_to = "src/pylhe/_version.py"
+[tool.hatch.version.raw-options]
 local_scheme = "no-local-version"
 
+[tool.hatch.build.hooks.vcs]
+version-file = "src/pylhe/_version.py"
+
+[tool.hatch.build.targets.sdist]
+# hatchling always includes:
+# pyproject.toml, .gitignore, any README, any LICENSE, AUTHORS
+include = [
+    "/src",
+    "/tests",
+    "/CITATION.cff",
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/pylhe"]
+
 [tool.black]
 line-length = 88
 include = '\.pyi?$'
@@ -19,18 +100,6 @@ extend-exclude = '''
 )/
 '''
 
-[tool.check-manifest]
-ignore = [
-    'examples/*',
-    'tests/*',
-    'docker/*',
-    '.*',
-    'pyproject.toml',
-    'pytest.ini',
-    'codecov.yml',
-    'CODE_OF_CONDUCT.md',
-]
-
 [tool.isort]
 profile = "black"