Increased stability for self posts. Still more work to be done.

rtv/content.py

@@ -55,6 +55,18 @@ def default_loader(self):
 
 class BaseContent(object):
 
+    def get(self, index, n_cols):
+        raise NotImplementedError
+
+    def iterate(self, index, step, n_cols):
+
+        while True:
+            try:
+                yield self.get(index, n_cols)
+            except IndexError:
+                break
+            index += step
+
     @staticmethod
     def flatten_comments(comments, root_level=0):
         """
@@ -251,12 +263,6 @@ class SubmissionContent(BaseContent):
         else:
             raise ValueError('% type not recognized' % data['type'])
 
-    def iterate(self, index, step, n_cols=70):
-
-        while True:
-            yield self.get(index, n_cols=n_cols)
-            index += step
-
 
 class SubredditContent(BaseContent):
     """
@@ -315,10 +321,4 @@ class SubredditContent(BaseContent):
         data['n_rows'] = len(data['split_title']) + 3
         data['offset'] = 0
 
-        return data
+        return data
-
-    def iterate(self, index, step, n_cols):
-
-        while True:
-            yield self.get(index, n_cols)
-            index += step

rtv/page.py

@@ -41,10 +41,13 @@ class Navigator(object):
 
         if forward:
             if self.page_index < 0:
-                # Special case - advance the page index if less than zero
+                if self._is_valid(0):
-                self.page_index = 0
+                    # Special case - advance the page index if less than zero
-                self.cursor_index = 0
+                    self.page_index = 0
-                redraw = True
+                    self.cursor_index = 0
+                    redraw = True
+                else:
+                    valid = False
             else:
                 self.cursor_index += 1
                 if self.cursor_index >= n_windows - 1: