bot.lua

args = {...};
local x = 0;
local y = args[1];
local z = 0;


function forward()

end

function up()
  y = y + 1;
  if turtle.detectUp() then
    turtle.digUp();
  end
  turtle.up();
end

function down()
  y = y - 1;
  if turtle.detectDown() then
    turtle.digDown();
  end
  turtle.down();
end

function descend()
  while y > -30 do
    down();
  end
end

function valuable(name)
  local lis = {"minecraft:diamond_ore", "minecraft:coal_ore", "minecraftt:gold_ore, minecraft_iron_ore", "minecraft_redstone_ore"};
  for index, value in ipairs(lis) do
    if value == name then
      return true;
    end
  end
  return false;
end


function scan()
  local success, data = turtle.inspectUp();
  if valuable(data.name) then
    print("this ore is valueable");
  end
end


if z == nil then
  print("please pass y value as argument");
  return;
end

local success, data = turtle.inspectDown();

if success then
  print("Block name: ", data.name);
  print("Block metadata: ", data.metadata);
  scan();
end

print("x: ", pos.x);
print("y: ", pos.y);
print("z: ", pos.z);