Issue #343 Added method to clear screen

rtv/page.py

@@ -397,7 +397,10 @@ class Page(object):
         # tmux) but many people override ther $TERM in their tmux.conf or
         # .bashrc file. Using clearok() instead seems to fix the problem, at
         # the expense of slightly more expensive screen refreshes.
-        self.term.stdscr.clearok(True)
+        # However clearok() introduced a screen flash bug to urxvt users so the 
+        # clear_screen() method chooses which of the two stdscr methods to use
+        # based on the $TERM environment variable
+        self.term.clear_screen()
         self.term.stdscr.refresh()
 
     def _draw_header(self):

rtv/terminal.py

@@ -769,3 +769,11 @@ class Terminal(object):
 
         out = '\n'.join(stack)
         return out
+    
+    # Resolves tmux touchwin() bug and urxvt clearok() flashing bug
+    def clear_screen(self):
+        if os.environ['TERM'] is not 'xterm-256color':
+            self.stdscr.touchwin()
+        else:
+            self.stdscr.clearok(True)
+