feat: add basic progress page/indicator support

so far "delete results" (for Raw Settings) is the only use case.

user cancel is not yet supported

tests/views/test_progress.py

@@ -0,0 +1,62 @@
+# -*- coding: utf-8; -*-
+
+from pyramid import testing
+
+from wuttaweb.views import progress as mod
+from wuttaweb.progress import get_progress_session
+from tests.util import WebTestCase
+
+
+class TestProgressView(WebTestCase):
+
+    def test_includeme(self):
+        self.pyramid_config.include('wuttaweb.views.progress')
+
+    def test_basic(self):
+        self.request.session.id = 'mockid'
+        self.request.matchdict = {'key': 'foo'}
+
+        # first call with no setup, will create the progress session
+        # but it should be "empty" - except not really since beaker
+        # adds some keys by default
+        context = mod.progress(self.request)
+        self.assertIsInstance(context, dict)
+
+        # now let's establish a progress session of our own
+        progsess = get_progress_session(self.request, 'bar')
+        progsess['maximum'] = 2
+        progsess['value'] = 1
+        progsess.save()
+
+        # then call view, check results
+        self.request.matchdict = {'key': 'bar'}
+        context = mod.progress(self.request)
+        self.assertEqual(context['maximum'], 2)
+        self.assertEqual(context['value'], 1)
+        self.assertNotIn('complete', context)
+
+        # now mark it as complete, check results
+        progsess['complete'] = True
+        progsess['success_msg'] = "yay!"
+        progsess.save()
+        context = mod.progress(self.request)
+        self.assertTrue(context['complete'])
+        self.assertEqual(context['success_msg'], "yay!")
+
+        # now do that all again, with error
+        progsess = get_progress_session(self.request, 'baz')
+        progsess['maximum'] = 2
+        progsess['value'] = 1
+        progsess.save()
+        self.request.matchdict = {'key': 'baz'}
+        context = mod.progress(self.request)
+        self.assertEqual(context['maximum'], 2)
+        self.assertEqual(context['value'], 1)
+        self.assertNotIn('complete', context)
+        self.assertNotIn('error', context)
+        progsess['error'] = True
+        progsess['error_msg'] = "omg!"
+        progsess.save()
+        context = mod.progress(self.request)
+        self.assertTrue(context['error'])
+        self.assertEqual(context['error_msg'], "omg!")