Modernise setup by moving from setup.py to pyproject.toml

.github/workflows/ci.yml

@@ -38,3 +38,32 @@ jobs:
     with:
       cfgrib: ecmwf/cfgrib@${{ github.event.pull_request.head.sha || github.sha }}
     secrets: inherit
+
+  # Coverage report
+  coverage:
+    name: Coverage Report
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+
+      - name: Run tests with coverage
+        run: |
+          uv run --group qc pytest -v --cov=cfgrib --cov=cf2cdm --cov-report=html --cache-clear
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report-html
+          path: htmlcov/
+          retention-days: 30

.github/workflows/docs.yml

@@ -0,0 +1,44 @@
+name: Build Documentation
+
+on:
+  # Trigger on push to master or develop
+  push:
+    branches:
+      - 'master'
+      - 'develop'
+
+  # Trigger on pull request
+  pull_request: ~
+
+  # Allow manual trigger
+  workflow_dispatch: ~
+
+jobs:
+  build-docs:
+    name: Build Sphinx Documentation
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+
+      - name: Install dependencies and build docs
+        run: |
+          uv run --group docs sphinx-build -W -b html docs build/sphinx/html
+
+      - name: Upload documentation artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: documentation-html
+          path: build/sphinx/html/
+          retention-days: 30

.github/workflows/packaging-test.yml

@@ -0,0 +1,73 @@
+name: Test Package
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build-package:
+    name: Build & verify package
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - uses: hynek/build-and-inspect-python-package@v2.14.0
+        id: baipp
+
+    outputs:
+      # Used to define the matrix for tests below. The value is based on
+      # packaging metadata (trove classifiers).
+      python-versions: ${{ steps.baipp.outputs.supported_python_classifiers_json_array }}
+
+  tests:
+    name: Tests on ${{ matrix.python-version }}
+    runs-on: ubuntu-latest
+    needs: build-package
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # Created by the build-and-inspect-python-package action above.
+        python-version: ${{ fromJson(needs.build-package.outputs.python-versions) }}
+
+    env:
+      PYTHON: ${{ matrix.python-version }}
+
+    steps:
+      - name: Get tox file
+        uses: actions/checkout@v6
+        with:
+          sparse-checkout: |
+            tox.ini
+            tests/
+          persist-credentials: false
+      - name: Download pre-built packages
+        uses: actions/download-artifact@v6
+        with:
+          name: Packages
+          path: dist
+      - run: |
+          tar xf dist/*.tar.gz --strip-components=1
+          rm -rf cfgrib
+          rm -rf cf2cdm
+      - uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
+      - uses: hynek/setup-cached-uv@v2
+
+      - name: Run tests against whl
+        run: |
+          uv run --with dist/*.whl --group test --python ${{ matrix.python-version }} \
+            pytest -v --cache-clear
+
+      - name: Run tests against sdist
+        run: |
+          uv run --with dist/*.tar.gz --group test --python ${{ matrix.python-version }} \
+            pytest -v --cache-clear

.github/workflows/weekly.yml

@@ -7,38 +7,17 @@ on:
 
 jobs:
   weekly:
-    runs-on: ${{ matrix.os }}-latest
+    runs-on: ${{ matrix.os }}
     strategy:
-      max-parallel: 5
       fail-fast: false
       matrix:
-        os: [ubuntu]
-        python: [3.7, 3.8]
-        extras: ['']
-        include:
-          - os: macos
-            python: 3.8
-          - os: windows
-            python: 3.8
-          - os: ubuntu
-            python: 3.9
-            extras: -minimal
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+        os: [windows-latest, ubuntu-latest, macos-latest]
 
     steps:
     - uses: actions/checkout@v2
-    - uses: conda-incubator/setup-miniconda@v2
+    - uses: astral-sh/setup-uv@v5
       with:
-        auto-update-conda: true
-        python-version: ${{ matrix.python }}
-        activate-environment: ${{ matrix.os }}-${{ matrix.python }}${{ matrix.extras }}
-        environment-file: environment${{ matrix.extras }}.in.yml
-    - name: Export concrete dependencies
-      shell: bash -l {0}
-      run: |
-        conda env export --no-build -f tests/environment-${{ matrix.os }}-${{ matrix.python }}${{ matrix.extras }}.yml
-        git diff
-    - name: Archive environment-${{ matrix.os }}-${{ matrix.python }}${{ matrix.extras }}.yml
-      uses: actions/upload-artifact@v4
-      with:
-        name: environment-${{ matrix.os }}-${{ matrix.python }}${{ matrix.extras }}.yml
-        path: tests/environment-${{ matrix.os }}-${{ matrix.python }}${{ matrix.extras }}.yml
+        enable-cache: true
+    - name: Run test suite Python ${{ matrix.python-version }}
+      run: uv run --group tests pytest -v --cache-clear

CHANGELOG.rst

@@ -5,20 +5,23 @@ Changelog for cfgrib
 unreleased
 ----------
 
+- Deprecating setuptools in favor of hatchling and pyproject.toml.
+  See `#438 <https://github.com/ecmwf/cfgrib/pull/438>`_.
+
 - Setup and apply linters via pre-commit.
   See `#439 <https://github.com/ecmwf/cfgrib/pull/439>`_.
 
 
 0.9.15.1 (2025-09-30)
 ---------------------
 
+- Fixed  xarray.backends imports for compatibilty with recent versions of xarray.
+  See `#409 <https://github.com/ecmwf/cfgrib/pull/409>`_.
+
 - Set default dtype for step to `timedelta64[ns]` for compatibilty with
   future versions of xarray.
   See `#427 <https://github.com/ecmwf/cfgrib/pull/427>`_.
 
-- Fixed  xarray.backends imports for compatibilty with recent versions of xarray.
-  See `#409 <https://github.com/ecmwf/cfgrib/pull/409>`_.
-
 
 0.9.15.0 (2024-12-18)
 ---------------------

cfgrib/__main__.py

@@ -140,6 +140,24 @@ def to_netcdf(
         for var in ds.data_vars:
             netcdf_kwargs["encoding"].setdefault(var, var_encoding)
 
+    # Add default encoding for time variables to avoid int64 casting issues
+    netcdf_kwargs.setdefault("encoding", {})
+    for var_name in ds.variables:
+        if var_name not in netcdf_kwargs["encoding"]:
+            var = ds[var_name]
+            # Check if variable has datetime-like or timedelta-like dtype
+            dtype_str = str(var.dtype)
+            if "datetime64" in dtype_str:
+                netcdf_kwargs["encoding"][var_name] = {
+                    "units": "seconds since 1970-01-01",
+                    "dtype": "int32",
+                }
+            elif "timedelta64" in dtype_str:
+                netcdf_kwargs["encoding"][var_name] = {
+                    "units": "seconds",
+                    "dtype": "int32",
+                }
+
     ds.to_netcdf(outpath, **netcdf_kwargs)