miner v1.1

local function find(itemName)
    print("Searching for",itemName)
    for curSlot = 1,16 do
        if turtle.getItemCount(curSlot) >= 1 then
            local data = turtle.getItemDetail(curSlot)
            if data.name == itemName then
                print("Found",itemName,"in slot",curSlot)
                return curSlot
            end
        end
    end
    print("Could not find",itemName)
    return false
end

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 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
    if find("minecraft:cobblestone") then
        turtle.select(find("minecraft:cobblestone"))
        turtle.placeDown()
    elseif find("minecraft:stone") then
        turtle.select(find("minecraft:stone"))
        turtle.placeDown()
    end
end

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

for curDist=0,maxDist do
    checkFuel(10)
    digAround()
    turtle.turnLeft()
    while not turtle.forward() do
        turtle.dig()
    end
    digAround()
    turtle.turnRight()
    turtle.turnRight()
    turtle.forward()
    while not turtle.forward() do
        turtle.dig()
    end
    digAround()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.forward()
    if (curDist % 7 == 0) and (find("minecraft:torch")) then
        turtle.select(find("minecraft:torch"))
        turtle.place()
    end
    turtle.turnRight()
    if curDist ~= maxDist then
        while not turtle.forward() do
            turtle.dig()
        end
    end
end

turtle.turnLeft()
turtle.turnLeft()
for curDist=0,maxDist do
    local success, data = turtle.inspect()
    if success then
        if data.name ~= "minecraft:chest" then
            while not turtle.forward() do
                turtle.dig()
            end
        end
    else
        while not turtle.forward() do
            turtle.dig()
        end
    end
end

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