Add lib2to3 fixer base code

Switching to using RedBaron instead of lib2to3, committing to save lib2to3 code in case using Baron is not successful.

scripts/fix_ext_import.py

@@ -0,0 +1,20 @@
+from lib2to3.fixer_base import BaseFix
+from lib2to3.fixer_util import Name, syms
+
+
+class FixExtImport(BaseFix):
+
+    PATTERN = "fixnode='oldname'"
+
+    def transform(self, node, results):
+        fixnode = results['fixnode']
+        fixnode.replace(Name('newname', prefix=fixnode.prefix))
+
+        if node.type == syms.import_from and \
+                getattr(results['imp'], 'value', None) == 'flask.ext':
+            return 0
+            # TODO: Case 2
+
+
+# CASE 1 - from flask.ext.foo import bam --> from flask_foo import bam
+# CASE 2 - from flask.ext import foo --> import flask_foo as foo

scripts/flaskext_migrate.py

@@ -1,30 +1,14 @@
-# from flask.ext import foo => import flask_foo as foo
+# CASE 1 - from flask.ext.foo import bam --> from flask_foo import bam
-# from flask.ext.foo import bam => from flask_foo import bam
+# CASE 2 - from flask.ext import foo --> import flask_foo as foo
-# import flask.ext.foo => import flask_foo
 
+from redbaron import RedBaron
 import sys
 
 
-def migrate(old_file):
+with open("test.py", "r") as source_code:
-    new_file = open("temp.py", "w")
+    red = RedBaron(source_code.read())
-    for line in old_file:
-        if line[0:14] == "from flask.ext":
-            if line[14] == '.':
-                import_statement = line[15::].split(' ')
-                extension = import_statement[0]
-                line = line.replace("flask.ext." + extension,
-                                    "flask_" + extension)
-            elif line[14] == " ":
-                import_statement = line[15::].split(' ')[1]
-                import_statement = import_statement.strip('\n')
-                line = ("import flask_" +
-                        import_statement +
-                        " as " +
-                        import_statement)
 
-        new_file.write(line)
+print red.dumps()
-    new_file.close()
 
-if __name__ == "__main__":
+# with open("code.py", "w") as source_code:
-    old_file = open(sys.argv[1])
+#     source_code.write(red.dumps())
-    migrate(old_file)

scripts/temp.py

@@ -1,19 +0,0 @@
-from flask_foo import bam
-import flask_foo as foo
-
-def migrate(old_file):
-    new_file = open("temp.py", "w")
-    for line in old_file:
-        if line[0, 15] is "from flask.ext":
-            if line[15] == '.':
-                import_statement = line[16::].split(' ')
-                extension = import_statement[0]
-                line = line. replace("flask.ext." + extension,
-                                     "flask_" + extension)
-            else:
-                pass
-
-        new_file.write(line)
-
-if __name__ == "__main__":
-    old_file = open(sys.arv[1])