Remove unpack_chunks code

dask.array.core.normalize_chunks is a better way
to do the same thing.

odc/loader/_builder.py

@@ -32,7 +32,6 @@
 from odc.geo.geobox import GeoBox, GeoBoxBase, GeoboxTiles
 from odc.geo.xr import xr_coords
 
-from ._dask import unpack_chunks
 from ._reader import nodata_mask, resolve_dst_fill_value, resolve_src_nodata
 from ._utils import SizedIterable, pmap
 from .types import (
@@ -195,7 +194,7 @@ def __call__(
             *postfix_dims,
         )
         assert len(chunk_shape) == len(shape)
-        chunks = unpack_chunks(chunk_shape, shape)
+        chunks: tuple[tuple[int, ...], ...] = normalize_chunks(chunk_shape, shape)
         tchunk_range = [
             range(last - n, last) for last, n in zip(np.cumsum(chunks[0]), chunks[0])
         ]

odc/loader/_dask.py

@@ -34,29 +34,3 @@ def tokenize_stream(
         for k, x in kx:
             dsk[k] = x
             yield k, x
-
-
-def unpack_chunksize(chunk: int, N: int) -> Tuple[int, ...]:
-    """
-    Compute chunk sizes
-    Example: 4, 11 -> (4, 4, 3)
-    """
-    if chunk >= N or chunk < 0:
-        return (N,)
-
-    nb = N // chunk
-    last_chunk = N - chunk * nb
-    if last_chunk == 0:
-        return tuple(chunk for _ in range(nb))
-
-    return tuple(chunk for _ in range(nb)) + (last_chunk,)
-
-
-def unpack_chunks(
-    chunks: Tuple[int, ...], shape: Tuple[int, ...]
-) -> Tuple[Tuple[int, ...], ...]:
-    """
-    Expand chunks
-    """
-    assert len(chunks) == len(shape)
-    return tuple(unpack_chunksize(ch, n) for ch, n in zip(chunks, shape))