A few minor tweaks:

* Only require simplejson if we need to.
 * Improve upon parameter validation.
 * Add a redirect utility function.
 * Remove some print statements.

pecan/__init__.py

@@ -1,7 +1,7 @@
 from paste.urlparser import StaticURLParser
 from paste.cascade import Cascade
 
-from pecan import Pecan, request, response, override_template
+from pecan import Pecan, request, response, override_template, redirect
 from decorators import expose
 
 __all__ = [

pecan/decorators.py

@@ -1,10 +1,18 @@
+from inspect import getargspec
+
 def expose(template=None, content_type='text/html'):
     if template == 'json': content_type = 'application/json'
     def decorate(f):
+        # flag the method as exposed
         f.exposed = True
+        
+        # set a "pecan" attribute, where we will store details
         if not hasattr(f, 'pecan'): f.pecan = {}
         f.pecan['content_type'] = content_type
         f.pecan.setdefault('template', []).append(template)
         f.pecan.setdefault('content_types', {})[content_type] = template
+        
+        # store the arguments for this controller method
+        f.pecan['argspec'] = getargspec(f)
         return f
     return decorate

pecan/pecan.py

@@ -28,6 +28,10 @@ def override_template(template):
     request.override_template = template
 
 
+def redirect(location):
+    raise exc.HTTPFound(location=location)
+
+
 class Pecan(object):
     def __init__(self, root, 
                  renderers        = renderers, 
@@ -70,6 +74,13 @@ class Pecan(object):
         for hook in state.hooks:
             getattr(hook, hook_type)(*args)
     
+    def get_validated_params(self, all_params, argspec):
+        valid_params = dict()
+        for param_name, param_value in all_params.iteritems():
+            if param_name in argspec.args:
+                valid_params[param_name] = param_value
+        return valid_params
+    
     def handle_request(self):
         # lookup the controller, respecting content-type as requested
         # by the file extension on the URI
@@ -94,8 +105,12 @@ class Pecan(object):
         self.handle_hooks('before', state)
     
         # get the result from the controller, properly handling wrap hooks
-        result = controller(**dict(state.request.str_params))
-                    
+        params = self.get_validated_params(
+            dict(state.request.str_params), 
+            controller.pecan['argspec']
+        )
+        result = controller(**params)
+        
         # pull the template out based upon content type and handle overrides
         template = controller.pecan.get('content_types', {}).get(content_type)
         template = getattr(request, 'override_template', template)

pecan/templating.py

@@ -35,10 +35,6 @@ class JsonRenderer(object):
     def render(self, template_path, namespace):
         from jsonify import encode
         result = encode(namespace)
-        print '*' * 80
-        print result
-        print type(result)
-        print '*' * 80
         return result
 
 

setup.py

@@ -17,10 +17,34 @@ class PyTest(Command):
         py.cmdline.pytest(py.std.sys.argv[2:])
 
 
+#
+# determine requirements
+#
+requirements = [
+  "WebOb >= 0.9.8", 
+  "simplegeneric >= 0.7",
+  "Genshi >= 0.6",
+  "Kajiki >= 0.2.2",
+  "Mako >= 0.3",
+  "py >= 1.3.4",
+  "WebTest >= 1.2.2",
+  "Paste >= 1.7.5.1",
+  "PasteScript >= 1.7.3"
+]
+
+try:
+    import json
+except:
+    requirements.append("simplejson >= 2.1.1")
+
+
+#
+# call setup
+#
 setup(
     name                 = 'pecan',
     version              = version,
-    description          = "A WSGI object-dispatching web framework, in the spirit of TurboGears, only much much smaller, with many fewer dependancies.",
+    description          = "A WSGI object-dispatching web framework, in the spirit of TurboGears, only much much smaller, with many fewer dependencies.",
     long_description     = None,
     classifiers          = [],
     keywords             = '',
@@ -32,19 +56,8 @@ setup(
     include_package_data = True,
     zip_safe             = True,
     cmdclass             = {'test': PyTest},
-    install_requires=[
-      "WebOb >= 0.9.8", 
-      "simplegeneric >= 0.7",
-      "Genshi >= 0.6",
-      "Kajiki >= 0.2.2",
-      "Mako >= 0.3",
-      "py >= 1.3.4",
-      "WebTest >= 1.2.2",
-      "Paste >= 1.7.5.1",
-      "simplejson >= 2.1.1",
-      "PasteScript >= 1.7.3"
-    ],
-    entry_points = """
+    install_requires     = requirements,
+    entry_points         = """
     [paste.paster_create_template]
     pecan-base = templates:NewProjectTemplate
     """,

tests/test_base.py

@@ -1,4 +1,4 @@
-from pecan import Pecan, expose, request, response
+from pecan import Pecan, expose, request, response, redirect
 from webtest import TestApp
 
 class TestBase(object):
@@ -160,4 +160,36 @@ class TestEngines(object):
         r = app.get('/')
         assert r.status_int == 200
         result = dict(loads(r.body))
-        assert result == expected_result
+        assert result == expected_result
+    
+    def test_controller_parameters(self):
+        class RootController(object):
+            @expose('json')
+            def index(self, argument=None):
+                assert argument == 'value'
+        
+        # arguments should get passed appropriately
+        app = TestApp(Pecan(RootController()))
+        r = app.get('/?argument=value')
+        assert r.status_int == 200
+        
+        # extra arguments get stripped off
+        r = app.get('/?argument=value&extra=not')
+        assert r.status_int == 200
+    
+    def test_redirect(self):
+        class RootController(object):
+            @expose()
+            def index(self):
+                redirect('/testing')
+            
+            @expose()
+            def testing(self):
+                return 'it worked!'
+        
+        app = TestApp(Pecan(RootController()))
+        r = app.get('/')
+        assert r.status_int == 302
+        r = r.follow()
+        assert r.status_int == 200
+        assert r.body == 'it worked!'