MasterShell

if not fs.exists("kapi") then
 shell.run("label set KlazTurtle")
 shell.run("pastebin get Wa30xjVY kapi")
 shell.run("pastebin get 4wViUFbv MineShaft")
 shell.run("pastebin get Ybfk4mFM HyperRefuel")
 shell.run("pastebin get 42ZuYW7f TreeFarm")
 os.loadAPI("kapi")
else
 os.loadAPI("kapi")
end

--Table of options
option = {"MineShaft", "HyperRefuel", "TreeFarm", "Advanced Options"}
advOption = {"Update All", "Update API", "Update Installer", "Reformat Turtle", "Exit"}

--Variables
l = #option
vl = #advOption
n = 1 --For Option Table
o = 1 --For advOption Table

while true do

 kapi.menu("Please select a program from the following:")
 for i = 1, l, 1 do
  if n == i then
   print(">" .. option[i] .. "<")
  else
   print(" " .. option[i])
  end
 end

 keypress = kapi.keyread()
 if keypress == keys.up then --Up Arrow
  if n == 1 then
   n = l
  else
   n = n - 1
  end
 elseif keypress == keys.down then --Down Arrow
  if n == l then
   n = 1
  else
   n = n + 1
  end
 elseif keypress == keys.enter then --Enter key
  kapi.clear()
  if option[n] == "Advanced Options" then
   while true do
    kapi.menu("Select one of the following options.")
    for i = 1, vl, 1 do
     if o == i then
      print(">" .. advOption[i] .. "<")
     else
      print(" " .. advOption[i])
     end
    end
    keypress = kapi.keyread()
    if keypress == keys.up then --Up Arrow
     if o == 1 then
      o = al
     else
      o = o - 1
     end
    elseif keypress == keys.down then --Down Arrow
     if o == al then
      o = 1
     else
      o = o + 1
     end
    elseif keypress == keys.enter then --Enter key
     if advOption[o] == "Update All" then
      shell.run("delete MineShaft")
      shell.run("delete HyperRefuel")
      shell.run("delete TreeFarm")
      print("Old versions deleted. Updating now.")
      shell.run("pastebin get 4wViUFbv MineShaft")
      shell.run("pastebin get Ybfk4mFM HyperRefuel")
      shell.run("pastebin get 42ZuYW7f TreeFarm")
      print("Update done! Press Enter to return to main menu.")
      kapi.rawread(keys.enter)
     elseif advOption[o] == "Update API" then
      shell.run("delete kapi")
      print("Old API deleted.")
      shell.run("pastebin get Wa30xjVY kapi")
      print("Update done! Press Enter to return to main menu.")
      kapi.rawread(keys.enter)
     elseif advOption[o] == "Update Installer" then
      print("Deleting old Installer")
      shell.run("delete startup")
      shell.run("pastebin get aWFTCV3M startup")
      print("Installer updated! Press Enter to reboot.")
      kapi.rawread(keys.enter)
      os.reboot()
     elseif advOption[o] == "Reformat Turtle" then
      shell.run("label clear")
      print("IF YOU DONT WANT TO LOSE FUEL, RELABEL BEFORE BREAKING")
      kapi.rawread(keys.enter)
      os.reboot()
     elseif advOption[o] == "Exit" then
      break
     else
     end
    end
   end
  else
   shell.run(option[n])
  end
 end
end