Mostly automatic incremental link enabling

tools/win/supalink/check_installed.py

+#!/usr/bin/env python
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import sys
+import os
+
+def main():
+  if sys.platform != 'win32':
+    sys.stdout.write('0')
+    return 0
+
+  import _winreg
+
+  try:
+    val = _winreg.QueryValue(_winreg.HKEY_CURRENT_USER,
+                             'Software\\Chromium\\supalink_installed')
+    if os.path.exists(val):
+      # Apparently gyp thinks this means there was an error?
+      #sys.stderr.write('Supalink enabled.\n')
+      sys.stdout.write('1')
+      return 0
+  except WindowsError:
+    pass
+
+  sys.stdout.write('0')
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())