Add group option to dataset_to_icechunk (#383)

* Bump ruff pre-commit hook and fix formatting

* Bump ruff target version to match min Python version

* Add `group` param to `dataset_to_icechunk` function

* Add unit tests for non-root groups

Fixes #341

.pre-commit-config.yaml

@@ -11,7 +11,7 @@ repos:
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: "v0.8.6"
+    rev: v0.9.2
     hooks:
       # Run the linter.
       - id: ruff

docs/releases.rst

@@ -15,6 +15,9 @@ New Features
   for the `to_icechunk` method to add timestamps as checksums when writing virtual references to an icechunk store. This
   is useful for ensuring that virtual references are not stale when reading from an icechunk store, which can happen if the
   underlying data has changed since the virtual references were written.
+- Add ``group=None`` keyword-only parameter to ``dataset_to_icechunk`` function to
+  allow writing to a nested group at the specified path (root group, if not specified).
+  (:issue:`341`) By `Chuck Daniels <https://github.com/chuckwondo>`_.
 
 Breaking changes
 ~~~~~~~~~~~~~~~~
@@ -26,6 +29,10 @@ Breaking changes
   Also a warning is no longer thrown when ``indexes=None`` is passed to ``open_virtual_dataset``, and the recommendations in the docs updated to match.
   This also means that ``xarray.combine_by_coords`` will now work when the necessary dimension coordinates are specified in ``loadable_variables``.
   (:issue:`18`, :pull:`357`, :pull:`358`) By `Tom Nicholas <https://github.com/TomNicholas>`_.
+- For function ``dataset_to_icechunk``, parameters ``append_dim`` and ``last_updated_at``
+  are now keyword-only parameters, rather than positional or keyword.  This change is
+  breaking _only_ where arguments for these parameters are currently given positionally.
+  (:issue:`341`) By `Chuck Daniels <https://github.com/chuckwondo>`_.
 
 Deprecations
 ~~~~~~~~~~~~

pyproject.toml

@@ -111,14 +111,15 @@ ignore_missing_imports = true
 # Same as Black.
 line-length = 88
 indent-width = 4
-target-version = "py39"
+target-version = "py310"
 
 exclude = [
     "docs",
-    ".eggs"]
+    ".eggs"
+]
 
 [tool.ruff.lint]
-# Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`)  codes by default.
+# Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`) codes by default.
 # Unlike Flake8, Ruff doesn't enable pycodestyle warnings (`W`) or
 # McCabe complexity (`C901`) by default.
 select = ["E4", "E7", "E9", "F", "I"]

virtualizarr/tests/test_readers/conftest.py

@@ -306,7 +306,7 @@ def filter_and_cf_roundtrip_hdf5_file(tmpdir, request):
 
     from random import randint
 
-    filepath = f"{tmpdir}/{request.param}_{randint(0,100)}_cf_roundtrip.nc"
+    filepath = f"{tmpdir}/{request.param}_{randint(0, 100)}_cf_roundtrip.nc"
     ds.to_netcdf(filepath, engine="h5netcdf", encoding=encoding)
 
     return filepath