Use fullscreen if the screen is not big enough to do a 1200x900 window.

The logic might need tweaking.

README

@@ -28,5 +28,6 @@ Alt+r  Rotate the screen
 Alt+o  Toggle overlay visibility
 Alt+=  Open the developer console
 Alt+0  Open the developer console
+Alt+q  Quit the emulator
 
-Ctrl+S Activate sketch mode in chat
+Ctrl+s Activate sketch mode in chat

sugar-emulator

@@ -19,6 +19,8 @@
 import os
 import sys
 
+import gtk
+
 os.environ['SUGAR_EMULATOR'] = 'yes'
 
 sourcedir = os.path.abspath(os.path.dirname(__file__))
@@ -31,6 +33,7 @@ else:
 
 from sugar import env
 from sugar import util
+from sugar.emulator import Emulator
 
 if sourcedir:
 	if os.environ.has_key('PYTHONPATH'):
@@ -70,16 +73,13 @@ if sourcedir:
 	util.write_service('org.laptop.sugar.Console', bin,
 					   env.get_user_service_dir())
 
-from sugar.emulator import Emulator
-
+if len(sys.argv) == 1:
     program = 'sugar-shell'
-
-fullscreen = False
-for i in range(1, len(sys.argv)):
-	if sys.argv[i] == '-fullscreen':
-		fullscreen = True
 else:
-		program = sys.argv[i]
+    program = sys.argv[1]
+
+fullscreen = (gtk.gdk.screen_width() <= 1200 and
+              gtk.gdk.screen_height() <= 900)
 
 emulator = Emulator(fullscreen)
 emulator.start()

sugar/emulator.py

@@ -84,7 +84,7 @@ class XephyrProcess(Process):
         if fullscreen:
             cmd += '-fullscreen '
         else:
-            cmd += '-screen 800x600 '
+            cmd += '-screen 1200x900'
         Process.__init__(self, cmd)
         
     def get_name(self):