Added new script used by new embedded python implementation.

This makes it easier to control restricted/unrestricted python
environments without requiring a client recompilation. Future
enhancements are now more likely to be strictly python code
changes.

changelog

@@ -16,6 +16,9 @@ Version 1.5.2+svn:
      areas and their schedules during scenario events. Removal requires to
      associate an id. to [time_area]s, or it won't work.
  * Python AI
+   * Added ai_init.py and ai_launcher.py to make it easier to customize
+	AI environment and startup. Both are used by the new embedded python
+	implementation.
    * reversed builtin is now allowed. This allows for random.shuffle to be
 	called.
 

data/ais/ai_launcher.py

@@ -0,0 +1,47 @@
+#!/bin/env python
+# Copyright Greg Copeland, 2008
+# Released under GPL license for Wesnoth. See Wesnoth's
+# licensing terms for this module's specific license.
+#
+
+import os
+import sys
+import traceback
+
+print "launch has been imported!"
+
+def launch( script, restrict ):
+    # Launch one of two possible environments
+    # If restrict arg is True, run inside the available
+    # restrictied python environment (safe.py). If restrict
+    # is False, then run without any type of restrictions.
+    if restrict:
+        print "restricted environment detected - running parse/safe"
+        try:
+            import safe
+            import parse
+
+            parse.paths = ""
+            code, context = parse.parse( script )
+            safe.safe_exec( code, context, restrict )
+
+        except:
+            err = str( traceback.format_exc() )
+            raise
+
+    else:
+        print "unrestricted environment detected...running directly."
+        __import__( script )
+        scrpt = sys.modules[ script ]
+
+        # Call our entry points
+        scrpt.start()
+        scrpt.turn()
+        scrpt.end()
+
+    print "launch has completed."
+
+
+
+
+