Add support for function call fixing, add tests

Addresses #1135, some code cleanup and refactoring. Changes wrapper function which handles testing, further modularized code, added test to cover function call fixing, and fixed duplicate test function name.

scripts/flaskext_migrate.py

@@ -70,18 +70,15 @@ def fix_standard_imports(red):
     """
     Handles import modification in the form:
     import flask.ext.foo" --> import flask_foo
-
-    Does not modify function calls elsewhere in the source outside of the
-    original import statement.
     """
     imports = red.find_all("ImportNode")
     for x, node in enumerate(imports):
         try:
-            if (node.value[0].value == 'flask' and
-               node.value[1].value == 'ext'):
-                package = node.value[2].value
-                name = node.names()[0]
-                imports[x].replace("import flask_%s as %s" % (package, name))
+            if (node.value[0].value[0].value == 'flask' and
+               node.value[0].value[1].value == 'ext'):
+                package = node.value[0].value[2]
+                name = node.names()[0].split('.')[-1]
+                node.replace("import flask_%s as %s" % (package, name))
         except IndexError:
             pass
 
@@ -90,7 +87,7 @@ def fix_standard_imports(red):
 
 def _get_modules(module):
     """
-    Takes a list of modules and converts into a string
+    Takes a list of modules and converts into a string.
 
     The module list can include parens, this function checks each element in
     the list, if there is a paren then it does not add a comma before the next
@@ -105,20 +102,46 @@ def _get_modules(module):
     return ''.join(modules_string)
 
 
+def fix_function_calls(red):
+    """
+    Modifies function calls in the source to reflect import changes.
+
+    Searches the AST for AtomtrailerNodes and replaces them.
+    """
+    atoms = red.find_all("Atomtrailers")
+    for x, node in enumerate(atoms):
+        try:
+            if (node.value[0].value == 'flask' and
+               node.value[1].value == 'ext'):
+                node.replace("flask_foo%s" % node.value[3])
+        except IndexError:
+            pass
+
+    return red
+
+
 def check_user_input():
     """Exits and gives error message if no argument is passed in the shell."""
     if len(sys.argv) < 2:
         sys.exit("No filename was included, please try again.")
 
 
-def fix(ast):
+def fix_tester(ast):
     """Wrapper which allows for testing when not running from shell."""
-    return fix_imports(ast).dumps()
+    ast = fix_imports(ast)
+    ast = fix_function_calls(ast)
+    return ast.dumps()
 
 
-if __name__ == "__main__":
+def fix():
+    """Wrapper for user argument checking and import fixing."""
     check_user_input()
     input_file = sys.argv[1]
     ast = read_source(input_file)
     ast = fix_imports(ast)
+    ast = fix_function_calls(ast)
     write_source(ast, input_file)
+
+
+if __name__ == "__main__":
+    fix()