Add GitHub Actions CI, modernize packaging (#302)

* Add tox and github actions

* Raise black target version to py37

* Formatting: Check in Black changes

* Move tox configs to setup.cfg

* Update Github Actions CI def

* Remove unsupported tests_require from setup.py

* Migrate metadata to pyproject.toml

* Safer test-directory discovery

* CI: Install graphviz with apt

* Remove old Travis/AppVeyor CI defs

* CI: Update to newer actions/checkout

---------

Co-authored-by: Miroslav Šedivý <6774676+eumiro@users.noreply.github.com>

.github/workflows/CI.yml

@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["*"]
+  workflow_dispatch:
+
+concurrency:
+  group: CI-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    name: "Test with Python ${{ matrix.python-version }}"
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        python-version:
+          - "3.12"
+          - "3.11"
+          - "3.10"
+          - "3.9"
+          - "3.8"
+          - "3.7"
+
+    steps:
+      - uses: "actions/checkout@v4"
+        with:
+          fetch-depth: 0
+      - uses: "actions/setup-python@v5"
+        with:
+          python-version: "${{ matrix.python-version }}"
+          cache: "pip"
+      - name: "Install dependencies"
+        run: |
+          sudo apt install graphviz
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install tox tox-gh
+      - name: "Setup tests"
+        run: tox -vv --notest
+      - name: "Run tests"
+        run: tox --skip-pkg-install

pyproject.toml

@@ -1,3 +1,60 @@
+[build-system]
+requires = ["setuptools"]
+
+[project]
+name = 'pydot'
+description = "Python interface to Graphviz's Dot"
+readme = "README.md"
+license = {file = "LICENSE"}
+requires-python = ">= 3.7"
+dependencies = [
+  'pyparsing>=2.1.4,<3'
+]
+authors = [
+  {name = "Ero Carrera", email = "ero.carrera@gmail.com"},
+  {name = "Peter Nowee", email = "peter@peternowee.com"},
+]
+maintainers = [
+  {name = "Peter Nowee", email = "peter@peternowee.com"},
+]
+keywords = ["graphviz", "dot", "graphs", "visualization"]
+classifiers = [
+  "Development Status :: 5 - Production/Stable",
+  "Intended Audience :: Developers",
+  "Intended Audience :: Science/Research",
+  "License :: OSI Approved :: MIT License",
+  "Natural Language :: English",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.5",
+  "Programming Language :: Python :: 3.6",
+  "Programming Language :: Python :: 3.7",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Topic :: Scientific/Engineering :: Visualization",
+  "Topic :: Software Development :: Libraries :: Python Modules",
+]
+dynamic = [
+  'version',
+]
+
+[project.urls]
+Homepage = "https://github.com/pydot/pydot"
+Changelog = "https://github.com/pydot/pydot/blob/master/ChangeLog"
+"Bug Tracker" = "https://github.com/pydot/pydot/issues"
+
+[project.optional-dependencies]
+dev = [
+  'chardet',
+  'black',
+]
+tests = [
+  'chardet',
+  'black',
+  'tox',
+]
+release = ['zest.releaser[recommended]']
+
 [tool.black]
 line-length = 79
-target-version = ['py35']
+target-version = ['py37']

setup.cfg

@@ -4,3 +4,34 @@ release=no
 push-changes=no
 create-wheel=yes
 tag-format=v{version}
+
+[tox:tox]
+min_version = 4.6.3
+env_list =
+    py312
+    py311
+    py310
+    py39
+    py38
+    py37
+    black
+
+[testenv]
+deps = chardet
+package = wheel
+wheel_build_env = .pkg
+commands = python test/pydot_unittest.py
+
+[testenv:black]
+deps = black
+commands = black --check --diff src/
+
+# For tox-gh
+[gh]
+python =
+    3.12 = py312, black
+    3.11 = py311
+    3.10 = py310
+    3.9 = py39
+    3.8 = py38
+    3.7 = py37

setup.py

@@ -34,44 +34,6 @@ def get_version():
     version=get_version(),
     package_dir={"": "src"},
     packages=["pydot"],
-    description="Python interface to Graphviz's Dot",
-    author="Ero Carrera",
-    author_email="ero.carrera@gmail.com",
-    maintainer="Peter Nowee",
-    maintainer_email="peter@peternowee.com",
-    url="https://github.com/pydot/pydot",
-    project_urls={
-        "Changelog": "https://github.com/pydot/pydot/blob/master/ChangeLog",
-        "Bug Tracker": "https://github.com/pydot/pydot/issues",
-    },
-    license="MIT",
-    keywords="graphviz dot graphs visualization",
-    platforms=["any"],
-    python_requires=">=3.5",
-    classifiers=[
-        "Development Status :: 5 - Production/Stable",
-        "Intended Audience :: Developers",
-        "Intended Audience :: Science/Research",
-        "License :: OSI Approved :: MIT License",
-        "Natural Language :: English",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
-        "Topic :: Scientific/Engineering :: Visualization",
-        "Topic :: Software Development :: Libraries :: Python Modules",
-    ],
     long_description=get_long_description(),
     long_description_content_type="text/markdown",
-    install_requires=["pyparsing>=2.1.4"],
-    extras_require={
-        "dev": [
-            "chardet",
-            "black==21.5b2; python_version > '3.5'",
-        ],
-    },
-    tests_require=["chardet"],
 )