Mostly automatic incremental link enabling

tools/win/supalink/check_installed.py

Index: tools/win/supalink/check_installed.py
diff --git a/tools/win/supalink/check_installed.py b/tools/win/supalink/check_installed.py
new file mode 100644
index 0000000000000000000000000000000000000000..88ce3fb0dc8f909f7dbd1c7980ccfac525287eb9
--- /dev/null
+++ b/tools/win/supalink/check_installed.py
@@ -0,0 +1,26 @@
+import sys
+
+def main():
+  if sys.platform != 'win32':
+    sys.stdout.write('0')
+    return
+
+  import _winreg
+  import os
+
+  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
+  except WindowsError:
+    pass
+
+  sys.stdout.write('0')
+
+if __name__ == '__main__':
+  main()
+  sys.exit(0)