fix backwards sorting

src/dolphin/io.py

@@ -329,6 +329,26 @@ def get_raster_bounds(
     return (left, bottom, right, top)
 
 
+def get_raster_metadata(filename: Filename, domain: str = ""):
+    """Get metadata from a raster file.
+
+    Parameters
+    ----------
+    filename : Filename
+        Path to the file to load.
+    domain : str, optional
+        Domain to get metadata for. Default is "" (all domains).
+
+    Returns
+    -------
+    dict
+        Dictionary of metadata.
+    """
+    ds = gdal.Open(fspath(filename))
+    md = ds.GetMetadata(domain)
+    return md
+
+
 def rowcol_to_xy(
     row: int,
     col: int,

src/dolphin/utils.py

@@ -242,11 +242,11 @@ def sort_key(file_date_tuple):
         except TypeError:
             return (-1, dates)
 
-    date_file_tuples = [(get_dates(f, fmt=file_date_fmt), f) for f in files]
-    date_files = sorted([fd_tuple for fd_tuple in date_file_tuples], key=sort_key)
+    file_date_tuples = [(f, get_dates(f, fmt=file_date_fmt)) for f in files]
+    file_dates = sorted([fd_tuple for fd_tuple in file_date_tuples], key=sort_key)
 
     # Unpack the sorted pairs with new sorted values
-    dates, file_list = zip(*date_files)  # type: ignore
+    file_list, dates = zip(*file_dates)  # type: ignore
     return list(file_list), list(dates)