-- try to get a script context, will be .nil, if script was not invoked by OOo
x_ScriptContext = uno.getScriptContext()
if (x_ScriptContext <> .nil) then
do
   -- invoked by OOo as a macro

   -- get context
   x_ComponentContext = x_ScriptContext~getComponentContext
   -- get desktop (an XDesktop)
   x_Desktop  = x_ScriptContext~getDesktop
   -- get current document
   x_Document = x_ScriptContext~getDocument
end
else  
do
   -- called from outside of OOo, create a connection

   -- connect to Open Office and get component context
   x_ComponentContext = UNO.connect()
   -- create a desktop service and its interface
   service = "com.sun.star.frame.Desktop"
   s_Desktop = x_ComponentContext~getServiceManager~XMultiServiceFactory~createInstance(service)
   x_Desktop = s_Desktop~XDesktop
   -- get the last active document
   x_Document = x_Desktop~getCurrentComponent()  
end




-- query current selection
x_Model = x_Document~XModel
selection = x_Model~getCurrentSelection()
x_Mergable = selection~XMergeable

-- if slecetion contains a merged cell unmerge it, else merge
-- whole selection to one cell
if x_Mergable~getIsMerged() then
do
   x_Mergable~merge(.false)
end
else
do
   x_Mergable~merge(.true)
end

::requires UNO.CLS