Create an index of interesting blocks

blocks.py

@@ -214,6 +214,10 @@ LEAVES = [
     'dark_oak_leaves',
 ]
 
+INDEXED = [
+    'chest',
+]
+
 
 NON_SOLID_IDS = set([SINGLE_SNOW])
 for block_name in NON_SOLID:
@@ -235,6 +239,11 @@ for block_name in LEAVES:
     for state in JSON_BLOCKS['minecraft:' + block_name]['states']:
         LEAF_IDS.add(state['id'])
 
+INDEXED_IDS = set()
+for block_name in INDEXED:
+    for state in JSON_BLOCKS['minecraft:' + block_name]['states']:
+        INDEXED_IDS.add(state['id'])
+
 
 def get(bid):
     name = BLOCKS[bid]