add rst auto complie most common code type

UltiSnips/rst.snippets

@@ -91,8 +91,21 @@ endsnippet
 ###########################################################################
 #                         More Specialized Stuff.                         #
 ###########################################################################
+global !p
+import re
+from collections import Counter
+def find_all_code_type(path):
+    with open(path) as source:
+        types = re.findall(r'[:|\.\.\s]code::?\s(\w+)', source.read())
+    try:
+        popular_type = Counter(types).most_common()[0][0]
+    except KeyError:
+        popular_type = "lua" # Don't break default
+
+    return popular_type
+endglobal
 snippet cb "Code Block" b
-.. code-block:: ${1:lua}
+.. code-block:: ${1:`!p snip.rv = find_all_code_type(path)`}
 
    ${2:code}