Only work with known scaffolds.

handroll/scaffolder.py

@@ -1,5 +1,6 @@
 # Copyright (c) 2015, Matt Layman
 
+from handroll.exceptions import AbortError
 from handroll.i18n import _
 
 BUILTIN_SCAFFOLDS = {
@@ -36,7 +37,9 @@ def get_label(scaffold):
 
 def make_scaffold(scaffold, site):
     """Make a site from the scaffold."""
-    # TODO: check that the scaffold is available.
+    if scaffold not in BUILTIN_SCAFFOLDS:
+        raise AbortError(_('There is no {scaffold} scaffold.'.format(
+            scaffold=scaffold)))
     # TODO: check the site does not exist.
     # TODO: make the site directory.
     # TODO: populate the site with content from the scaffold.

handroll/tests/test_scaffolder.py

@@ -3,6 +3,7 @@
 import mock
 
 from handroll import scaffolder
+from handroll.exceptions import AbortError
 from handroll.i18n import _
 from handroll.tests import TestCase
 
@@ -28,3 +29,10 @@ def test_displays_scaffolds(self, display_scaffold):
     def test_makes_scaffold(self, make_scaffold):
         scaffolder.make('default', 'site')
         make_scaffold.assert_called_once_with('default', 'site')
+
+    def test_unknown_scaffold_aborts(self):
+        try:
+            scaffolder.make_scaffold('fake', 'dontcare')
+            self.fail()
+        except AbortError:
+            pass