add utils.terminal_execute_option field

lib/menubar/utils.lua

@@ -34,6 +34,10 @@ local utils = {}
 --- Terminal which applications that need terminal would open in.
 utils.terminal = 'xterm'
 
+--- Terminal argument which indicates the execution of command
+--  Usually something like ' -e ', ' -x ', ' -- '
+utils.terminal_execute_option = ' -e '
+
 --- The default icon for applications that don't provide any icon in
 -- their .desktop files.
 local default_icon = nil
@@ -399,7 +403,7 @@ function utils.parse_desktop_file(file)
             cmdline = cmdline:gsub('%%i', '')
         end
         if program.Terminal == true then
-            cmdline = utils.terminal .. ' -e ' .. cmdline
+            cmdline = utils.terminal .. utils.terminal_execute_option .. cmdline
         end
         program.cmdline = cmdline
     end