Modernise packaging, fix path and overwrite handling, add linting and tests

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+    branches: ['**']
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-python@v6
+        with:
+          python-version: '3.13'
+      - uses: pre-commit/action@v3.0.1
+
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        python-version: ['3.9', '3.12', '3.13']
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install package with test dependencies
+        run: pip install -e ".[dev]"
+      - name: Run tests
+        # Agg keeps matplotlib off a display that the runners do not have
+        env:
+          MPLBACKEND: Agg
+        run: pytest -q

.gitignore

@@ -34,4 +34,8 @@ var/
 # PyInstaller
 /weighslide.egg-info/
 
-*__pycache__*
+*__pycache__*
+# ruff / mypy / pytest caches
+.ruff_cache/
+.mypy_cache/
+.pytest_cache/

.pre-commit-config.yaml

@@ -0,0 +1,25 @@
+# Run `pre-commit install` after cloning. CI runs the same hooks.
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+      - id: check-yaml
+      - id: check-toml
+      - id: check-merge-conflict
+  - repo: https://github.com/psf/black
+    rev: 26.5.1
+    hooks:
+      - id: black
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.15.22
+    hooks:
+      - id: ruff-check
+        args: [--fix]
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v2.3.0
+    hooks:
+      - id: mypy
+        args: [--ignore-missing-imports, --allow-untyped-globals]
+        files: ^weighslide/.*\.py$

MANIFEST.in

@@ -1,7 +1,5 @@
-include MANIFEST.in
 include LICENSE.txt
-include setup.cfg
 include README.md
 include examples/input.png
 include examples/output.png
-include examples/contact.png
+include examples/contact.png