Add indentation engine and other fixes

samples/lua.lua

@@ -102,8 +102,8 @@ local nothing = nil
 -- Comments
 -- Single line
 --[[
-    Multi-line
-    comment
+  Multi-line
+  comment
 ]]
 
 -- Strings

samples/python.py

@@ -12,6 +12,7 @@ NotImplemented
 Ellipsis
 __name__  # builtin constant
 
+
 # ==============================
 # Imports
 # ==============================
@@ -71,7 +72,7 @@ GLOBAL_VAR = 3
 
 # Builtin variable references
 self = "something"
-cls = "class"
+cls = "dj"
 
 # ==============================
 # Control flow

samples/ruby.rb

@@ -18,7 +18,7 @@ cjk_samples = [
   "測試中文字串",
   "한국어 테스트",
   "ひらがなカタカナ😀混合",
-  "大量の文字列🚀🚀🚀",
+  "大量の文字列🚀🚀🚀"
 ]
 
 # Ruby regex with unicode