Creating a shop script

"on_start" = [ money = 0 pie = 0 sword = 0 treasure = 0 ] "level_trigger_1" = [ money = ( + $money 5 ) echo "You got 5 moneys." ] "level_trigger_2" = "showgui Shopkeeper" newgui Shopkeeper [ guitext "What're ya buyin, stranger?" chat guibar guilist [ guibutton "Pie: 10 moneys" [ if ( > $money 9 ) [ money = ( - $money 10 ) pie = ( + $pie 1 ) ] ] guibar guibutton "Sword: 20 moneys" [ if ( > $money 19 ) [ money = ( - $money 20 ) sword = ( + $sword 1 ) ] ] guibar guibutton "Treasure: 40 moneys" [ if ( > $money 39 ) [ money = ( - $money 40 ) treasure = ( + $treasure 1 ) ] ] ] ] newgui Inventory [ guibutton "Back" "cleargui 1" guibar guitext ( format "You have %1 moneys in your wallet." $money ) guitext ( format "You have %1 pies. Yum." $pie ) guitext ( format "You have %1 swords. Not that you can use them..." $sword ) guitext ( format "You have %1 treasures. Lucky you!" $treasure ) ] newgui main [ guilist [ guilist [ guibutton "Inventory" "showgui Inventory" ] ] guibar @main ]