Tunneling script for Computercraft turtle

-- computercraft tunneling program 1x3 for strip-minning
-- options for Enderchest, torches, normal chests and loot-only
-- ########## NOT READY #############

local useEnderChest = false                                 -- place a enderchest, dump stuff in it and collect chest?
local enderChestSlot = 2                                -- slot to place enderchest
local useNormalChest = false                                -- place a chest, dump stuff in it and move on?
local normalChestSlot = 3                               -- slot to place chests
local lootOnly = true                                   -- discard dirt cobble etc?
local useTorch = false                                  -- place torches along path?
local torchSlot = 1                                 -- turtleslot to put torches
local torchInterval = 8                                 -- place torch every X blocks
local returnToStart = false                             --
local tLenght = 30                                  -- tunnels for 30 blocks

torchNeeded = math.floor(tLenght / torchInterval)                   -- calculating needed torches


shell.run("clear")

if turtle.getItemDetail(enderChestSlot) ~= "ender_chest" then
    print("no Enderchest found in slot ".. enderChestSlot)
end
if turtle.getItemDetail(normalChestSlot) ~= "chest" then
    print("no chest found in slot ".. normalChestSlot)
end

if turtle.detectDown() then
    turtle.up()
end
for i=0,tLenght do
    while turtle.digUp() do
        -- waiting for gravel or sand to fall down
        sleep(.2)
    end
    while turtle.dig() do
        -- waiting for gravel or sand to fall down
        sleep(.2)
    end
    turtle.forward()
    turtle.digDown()
    if turtle.getItemCount(16) ~= 0 then
        if useEnderChest then
            turtle.select(enderChestSlot)
            turtle.placeUp()
            if lootOnly then
                for slot=4, 16 do
                    info = turtle.getItemDetail(slot)
                    if info.name ~= "cobblestone" or info.name ~= "dirt" or info.name ~= "gravel" or info.name ~= "sand" then
                        turtle.select(slot)
                        turtle.dropUp()
                    else
                        turtle.select(slot)
                        turtle.dropDown()
                    end
                end
            else
                for slot=4, 16 do
                    turtle.select(slot)
                    turtle.dropUp()
                end
            end
            turtle.digUp() -- pickup enderchest
            for a=1,16 do
                temp1 = turtle.getItemDetail(enderChestSlot)
                if temp1.name == "ender_chest" then
                    turtle.select(a)
                    turtle.transferTo(enderChestSlot)
                end
            end
        else if useNormalChest then
            turtle.select(normalChestSlot)
            if lootOnly then
                for slot=4, 16 do
                    info = turtle.getItemDetail(slot)
                    if info.name ~= "cobblestone" or info.name ~= "dirt" or info.name ~= "gravel" or info.name ~= "sand" then
                        turtle.select(slot)
                        turtle.dropUp()
                    else
                        turtle.select(slot)
                        turtle.dropDown()
                    end
                end
            else
                for slot=4, 16 do
                    turtle.select(slot)
                    turtle.dropUp()
                end
            end
            turtle.digUp() -- pickup chest
            for a=1,16 do
                temp2 = turtle.getItemDetail(normalChestSlot)
                if temp2.name == "chest" then
                    turtle.select(a)
                    turtle.transferTo(normalChestSlot)
                end
            end
        end
    end
    if useTorch then
        if i == torchInterval then
            torchInterval = torchInterval+torchInterval
            turtle.select(torchSlot)
            if turtle.getItemCount(torchSlot) ~= 0 then
                turtle.placeDown()
            else
                turtle.down()
                while turtle.getItemCount(torchSlot) < torchNeeded do
                    shell.run("clear")
                    print("Torches needed, Will resume when replenished.")
                    print("Would need " .. torchNeeded .. "torches.")
                    sleep(3)
                end
                shell.run("clear")
                turtle.up()
                print("here we go again.")
            end
            turtle.select(4)
        end
    end
end
end
if returnToStart then
    for I=0,tLength do
        turtle.back()
    end
    print("Done, returned to start!")
else
    print("Done, take me away!")
end