Move ncurses code into a set of classes.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>

newfol

@@ -55,11 +55,12 @@ def convert_color(x):
 
 locale.setlocale(locale.LC_ALL, '')
 
-def start_curses():
-    palette = [
-            ('bg', 'black', 'yellow', '', 'black', '#ffa'),
-            ('text', 'black', 'yellow', '', '#860', '#ffa'),
-    ]
+class View:
+    def render(self, loop):
+        pass
+
+class IntroView(View):
+    def render(self, loop):
         intro1 = urwid.Text(("text", "newfol " + __version__), align="center")
         intro2 = urwid.Text(("text", "Press q to quit at any time."),
                 align="center")
@@ -68,12 +69,22 @@ def start_curses():
             urwid.AttrMap(intro2, "bg")])
         fill = urwid.Filler(pile)
         map2 = urwid.AttrMap(fill, "bg")
+        loop.widget = map2
 
+
+def start_curses():
+    palette = [
+            ('bg', 'black', 'yellow', '', 'black', '#ffa'),
+            ('text', 'black', 'yellow', '', '#860', '#ffa'),
+    ]
     def exit_on_q(inp):
         if inp in ('q', 'Q'):
             raise urwid.ExitMainLoop()
-    loop = urwid.MainLoop(map2, palette, unhandled_input=exit_on_q)
+
+    intro = IntroView()
+    loop = urwid.MainLoop(None, palette, unhandled_input=exit_on_q)
     loop.screen.set_terminal_properties(colors=256)
+    intro.render(loop)
     loop.run()
 
 def load_schemata():