better error messages

cornfig/cornfig.py

@@ -33,17 +33,19 @@ def render_template(template, config):
   if is_executable(template):
     return render_executable(template, config)
   else:
-    return render_moustache(open(template).read(), config)
+    try:
+      return render_moustache(open(template).read(), config)
+    except KeyNotFoundError as e:
+      raise CornfigException("key '%s' does not exist in metadata file '%s'" % (e.key, template))
+    except Exception as e:
+      raise CornfigException("could not render moustache template %s" % template)
 
 def is_executable(path):
   return os.path.isfile(path) and os.access(path, os.X_OK)
 
 def render_moustache(text, config):
-  try:
-    r = pystache.Renderer(missing_tags = 'strict')
-    return r.render(text, config)
-  except KeyNotFoundError as e:
-    raise CornfigException("key '%s' does not exist in metadata file." % e.key)
+  r = pystache.Renderer(missing_tags = 'strict')
+  return r.render(text, config)
 
 def render_executable(path, config):
   p = Popen([path], stdin=PIPE, stdout=PIPE, stderr=PIPE)

setup.py

@@ -9,7 +9,7 @@ config = {
     'author': 'echohead',
     'author_email': 'tim.miller.0@gmail.com',
     'url': 'http://github.com/echohead/cornfig',
-    'version': '0.1',
+    'version': '0.2',
     'install_requires': ['nose'],
     'packages': ['cornfig'],
     'scripts': [],

tests/cornfig_tests.py

@@ -57,7 +57,7 @@ def test_render_template():
 def test_render_moustache():
   assert_equals( render_moustache("ab{{x.a}}cd", {"x": {"a": "123"}}), "ab123cd" )
 
-@raises(CornfigException)
+@raises(Exception)
 def test_render_moustache_bad_key():
   render_moustache("{{badkey}}", {})