Add first set of classes for Python formatter

Author: knutwannheden

rewrite/rewrite/python/__init__.py

@@ -4,6 +4,7 @@
 from .parser import *
 from .visitor import *
 from .markers import *
+from .format import *
 
 __all__ = [
     'Py',
@@ -51,4 +52,7 @@
     'UnionType',
     'VariableScope',
     'YieldFrom',
+
+    # Formatter
+    'AutoFormat',
 ]

rewrite/rewrite/python/format/__init__.py

@@ -0,0 +1,7 @@
+__path__ = __import__('pkgutil').extend_path(__path__, __name__)
+
+from .auto_format import *
+
+__all__ = [
+    'AutoFormat'
+]

rewrite/rewrite/python/format/auto_format.py

@@ -0,0 +1,18 @@
+from typing import Optional
+
+from rewrite import Recipe, Tree, Cursor
+from rewrite.python import PythonVisitor
+from rewrite.visitor import P, T
+
+
+class AutoFormat(Recipe):
+    def get_visitor(self):
+        return AutoFormatVisitor()
+
+
+class AutoFormatVisitor(PythonVisitor):
+    def __init__(self, stop_after: Tree = None):
+        self._stop_after = stop_after
+
+    def visit(self, tree: Optional[Tree], p: P, parent: Optional[Cursor] = None) -> Optional[T]:
+        pass