runtime/plugins/ftoptions/ftoptions.lua

   1 function onViewOpen(view)
   2     local ft = view.Buf.Settings["filetype"]
   3
   4     if ft == "makefile" or ft == "go" then
   5         SetOption("tabstospaces", "off")
   6     elseif ft == "python" then
   7         SetOption("tabstospaces", "on")
   8     end
   9 end