Add test for naming module and fix logic to cover

scripts/flaskext_migrate.py

@@ -43,21 +43,26 @@ def fix_from_imports(red):
     Case 2: from flask.ext import foo --> import flask_foo as foo
     """
     from_imports = red.find_all("FromImport")
-    for x in range(len(from_imports)):
-        values = from_imports[x].value
+    for x, node in enumerate(from_imports):
+        values = node.value
         if (values[0].value == 'flask') and (values[1].value == 'ext'):
             # Case 1
-            if len(from_imports[x].value) == 3:
+            if len(node.value) == 3:
                 package = values[2].value
-                modules = from_imports[x].modules()
-                r = "{}," * len(modules)
-                from_imports[x].replace("from flask_%s import %s"
-                                        % (package, r.format(*modules)[:-1]))
+                modules = node.modules()
+                if len(modules) > 1:
+                    r = "{}," * len(modules)
+                    node.replace("from flask_%s import %s"
+                                 % (package, r.format(*modules)[:-1]))
+                else:
+                    name = node.names()[0]
+                    node.replace("from flask_%s import %s as %s"
+                                 % (package, modules.pop(), name))
             # Case 2
             else:
-                module = from_imports[x].modules()[0]
-                from_imports[x].replace("import flask_%s as %s"
-                                        % (module, module))
+                module = node.modules()[0]
+                node.replace("import flask_%s as %s"
+                             % (module, module))
     return red
 
 
@@ -70,13 +75,13 @@ def fix_standard_imports(red):
     original import statement.
     """
     imports = red.find_all("ImportNode")
-    for x in range(len(imports)):
-        values = imports[x].value
+    for x, node in enumerate(imports):
         try:
-            if (values[x].value[0].value == 'flask' and
-            values[x].value[1].value == 'ext'):
-                package = values[x].value[2].value
-                imports[x].replace("import flask_%s" % package)
+            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))
         except IndexError:
             pass
 
@@ -88,6 +93,8 @@ def fix(ast):
     return fix_imports(ast).dumps()
 
 if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        sys.exit("No filename was included, please try again.")
     input_file = sys.argv[1]
     ast = read_source(input_file)
     ast = fix_imports(ast)

tests/test_import_migration.py

@@ -1,7 +1,8 @@
 # Tester for the flaskext_migrate.py module located in flask/scripts/
 #
 # Author: Keyan Pishdadian
-
+import sys
+sys.path.append('scripts')
 import pytest
 from redbaron import RedBaron
 import flaskext_migrate as migrate
@@ -16,7 +17,7 @@ def test_simple_from_import():
 def test_from_to_from_import():
     red = RedBaron("from flask.ext.foo import bar")
     output = migrate.fix(red)
-    assert output == "from flask_foo import bar"
+    assert output == "from flask_foo import bar as bar"
 
 
 def test_multiple_import():
@@ -38,3 +39,9 @@ def test_module_import():
     red = RedBaron("import flask.ext.foo")
     output = migrate.fix(red)
     assert output == "import flask_foo"
+
+
+def test_module_import():
+    red = RedBaron("from flask.ext.foo import bar as baz")
+    output = migrate.fix(red)
+    assert output == "from flask_foo import bar as baz"