Exec_Sign_0_1

-- ######################################
-- Exec Sign
-- version 0.1
-- http://hevohevo.hatenablog.com/

-- Required: OpenPeripheral MOD
-- Turtle basically goes forward.
-- When he reaches an sign, run the program.


-- Write functions to the sign
-- Semicolon is important to order some functions.
-- t = turtle

-- ------------------
-- | t.turnRight(); |
-- | t.turnRight(); |
-- | t.turnRight(); |
-- | t.turnRight(); |
-- ------------------
--        |
--        |
--        |


-- required OpenPeripheral MOD
-- if not fs.exists ("openp/") then
--  error("Required: OpenPeripheral MOD")
-- end

-- Config
SIGN = "sign"

function exec_sign()
  t=turtle
  local p = peripheral.wrap("front")
  if p then
    local text = p.getText()
    if string.find(text, "-->") then
      turtle.turnRight()
    elseif string.find(text, "<--") then
      turtle.turnLeft()
    else
      local func, err = loadstring(text)
      if not func then
        printError( err )
        return
      end
      setfenv(func, getfenv())
      local success, msg = pcall(func)
      if not success then
        printError( msg )
      end
    end
  else
    error("unrecognize sign.")
  end
end

function isType(type_name)
  return peripheral.getType("front")==type_name
end

while true do
  if turtle.detect() then
    if isType(SIGN) then
      print("detect a sign")
      exec_sign()
    else
      print("detect a block")
    end
  else
    turtle.forward()
  end
end