Install slateControl

fileNames = { "slateControl", "gui", "blank", "reinforced", "imbued", "demonic", "ethereal", "startup2" }
pastebins = { "VNipiBCm", "e5BTwCf7", "VeUdQcV5", "Bd3k4MET", "xV12cWrp", "XwhmXPwN", "JxS4jjGW", "JxS4jjGW" }
goAhead = {}
term.clear()
term.setCursorPos(1,1)

print("You are attempting to install LezChap's Slate Crafting Terminal.  Please wait while we check your system's available memory...")
print(" ")

function checkFile(name)
  if fs.exists(name) then
    sleep(.5)
    print("File '"..name.."' already exists.  It must be removed to continue the install, do you wish to delete the original file? (Y or N)")
    local waiting = true
    os.startTimer(1)
    while waiting do
      event, param1, param2 = os.pullEvent()
      if event == "timer" then
        os.startTimer(1)
      end
      if event == "char" then
        if param1 == "y" or param1 == "Y" then
          print(param1)
          fs.delete(name)
          waiting = false
          return true
        end
        if param1 == "n" or param1 == "N" then
          print(param1)
          print("Installation cannot continue...you selected No.")
          os.queueEvent("terminate")
          sleep(1)
          waiting = false
          return false
        end
      end
    end
  else
    return true
  end
end

for k,v in ipairs(fileNames) do
  if checkFile(v) then
    goAhead[k] = true
  end
end

fail = false

for k, v in pairs(goAhead) do
  if not v then
    fail = true
    break
  end
end

if fail then
  print("Cannot install the Slate Crafting Terminal, you must have selected to not delete a file.")
  print("Please fix the problem and try again.")
else
  print("Downloading Programs:")
  for k,v in ipairs(fileNames) do
    print(v..":")
    shell.run("pastebin get "..pastebins[k].." "..v)
  end
  print("Installation complete.  Please rename 'startup2' to 'startup' to run automatically on boot.")
  print("Make sure to edit the Redstone input/output directions in the variables at the top of 'slateControl' or the program won't function properly.")
  print("Requires a properly configured SFM setup.  Please see the following album for an idea on how to accomplish this: http://imgur.com/a/es2gi")
end