Use pattern matching to filter invalid tile filenames from discovery

.gitignore

@@ -28,3 +28,5 @@ geotessera_vis.png
 .venv
 build/
 repomix-*
+*.err
+.pytest_cache/

geotessera/tiles.py

@@ -327,6 +327,7 @@ def discover_tiles(directory: Path) -> List[Tile]:
     embeddings_dir = directory / EMBEDDINGS_DIR_NAME
     if embeddings_dir.exists() and embeddings_dir.is_dir():
         # Check if there are any .npy files (not just _scales.npy)
+        # The actual pattern validation happens in discover_npy_tiles()
         npy_files = [
             f
             for f in embeddings_dir.rglob("*.npy")
@@ -374,6 +375,10 @@ def discover_npy_tiles(base_dir: Path) -> List[Tile]:
                 tiles.append(tile)
             else:
                 logging.warning(f"Skipping incomplete tile: {npy_file}")
+        except ValueError:
+            # Skip files that don't match expected filename pattern
+            # ValueError is raised by _parse_npy_filename when pattern doesn't match
+            continue
         except Exception as e:
             logging.warning(f"Failed to load tile {npy_file}: {e}")
 
@@ -402,6 +407,10 @@ def discover_geotiff_tiles(directory: Path) -> List[Tile]:
             try:
                 tile = Tile.from_geotiff(geotiff_file)
                 tiles.append(tile)
+            except ValueError:
+                # Skip files that don't match expected filename pattern
+                # ValueError is raised by _parse_geotiff_filename when pattern doesn't match
+                continue
             except Exception as e:
                 logging.warning(f"Failed to load tile {geotiff_file}: {e}")
 
@@ -427,6 +436,10 @@ def discover_zarr_tiles(directory: Path) -> List[Tile]:
             try:
                 tile = Tile.from_zarr(zarr_file)
                 tiles.append(tile)
+            except ValueError:
+                # Skip files that don't match expected filename pattern
+                # ValueError is raised by _parse_zarr_filename when pattern doesn't match
+                continue
             except Exception as e:
                 logging.warning(f"Failed to load tile {zarr_file}: {e}")
 

tests/cli.t

@@ -185,3 +185,19 @@ Test that re-running the NPY download skips existing files:
   >   --dataset-version v1 2>&1 | grep -E '(Skipped|existing files)'
      Skipped 48 existing files (resume capability)
 
+Test: Tile Discovery Ignores Temporary Files
+---------------------------------------------
+
+Test that temporary files left from interrupted downloads are silently ignored.
+Create temporary files manually in the NPY tiles directory to simulate interrupted downloads:
+
+  $ touch "$TESTDIR/uk_tiles_npy/global_0.1_degree_representation/2024/.grid_0.05_51.25.npy_tmp_abc123"
+  $ touch "$TESTDIR/uk_tiles_npy/global_0.1_degree_representation/2024/.grid_0.05_51.35_tmp_xyz789.npy"
+  $ touch "$TESTDIR/uk_tiles_npy/global_0.1_degree_representation/2024/invalid_file.npy"
+
+Verify that the info command still works correctly and doesn't show warnings about temp files.
+The tile count should remain 16 (unchanged) and no warnings should appear in stderr:
+
+  $ uv run -m geotessera.cli info --tiles "$TESTDIR/uk_tiles_npy" 2>&1 | grep -E '(Total tiles|WARNING|Failed to load|Cannot parse)'
+   Total tiles: 16
+