Add sign-labeled chest storage

mosfet/info/items.py

@@ -83,6 +83,25 @@ EMERALD_ID = get_id('emerald')
 BERRIES_ID = get_id('sweet_berries')
 IRON_INGOT_ID = get_id('iron_ingot')
 
+
+_LABEL_ITEM_IDS = {
+    'seeds': get_set({
+        'beetroot', 'beetroot_seeds', 'carrot', 'melon_seeds',
+        'nether_wart', 'pitcher_pod', 'potato', 'pumpkin_seeds',
+        'torchflower_seeds', 'wheat_seeds',
+    }),
+    'wheat': {WHEAT_ID},
+}
+
+
+def storage_item_ids_for_label(label):
+    """Return protocol item IDs assigned to a sign storage label."""
+    normalized = ' '.join(str(label).casefold().split()).strip(' :')
+    normalized = (normalized.rstrip('s')
+                  if normalized not in ('seeds', 'beds') else normalized)
+    return set(_LABEL_ITEM_IDS.get(normalized, ()))
+
+
 INIT_NEEDED_ITEMS = BED_IDS | FOOD_IDS
 INIT_NEEDED_ITEMS.add(CHEST_ID)
 NEEDED_ITEMS = INIT_NEEDED_ITEMS