miner v1

local tArgs = { ... }
if #tArgs ~= 1 then
    print( "Usage: miner <distance>" )
    return
end

local maxDist = tonumber( tArgs[1] )
if maxDist < 1 then
    print( "Distance must be positive" )
    return
end

local function find(itemName)
    for curSlot = 1,16 do
        local data = turtle.getItemDetail(curSlot)
        if data.name == itemName then
            return curSlot
        end
    end
    return false
end

local function digAround()
    while turtle.detectUp() do
        turtle.digUp()
    end
    if turtle.detectDown() then
        local success, data = turtle.inspectDown()
        if success then
            if not (data.name == "minecraft:cobblestone") and not (data.name == "minecraft:stone") and not (data.name == "minecraft:sand") and not (data.name == "minecraft:dirt") and not (data.name == "minecraft:gravel") and not (data.name == "chisel:marble2") and not (data.name == "chisel:limestone2") then
                turtle.digDown()
            end
        end

    end
    turtle.select(find("minecraft:cobblestone"))
    turtle.placeDown()
end

local function checkFuel(level)
    if turtle.getFuelLevel() <= level then
        turtle.select(find("minecraft:coal"))
        turtle.refuel(1)
    end
end

for curDist=0,maxDist do
    checkFuel(10)
    while turtle.detect() do
        turtle.dig()
        digAround()
    end
    turtle.turnLeft()
    while turtle.detect() do
        turtle.dig()
    end
    turtle.forward()
    digAround()
    turtle.turnRight()
    turtle.turnRight()
    turtle.forward()
    while turtle.detect() do
        turtle.dig()
    end
    turtle.forward()
    digAround()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
    if curDist ~= maxDist then
        turtle.forward()
    end
end

turtle.turnLeft()
turtle.turnLeft()
for curDist=0,maxDist do
    turtle.forward()
    while turtle.detect() do
        turtle.dig()
    end
end

for curSlot = 1,16 do
    turtle.select(curSlot)
    turtle.drop()
end
turtle.turnLeft()
turtle.turnLeft()