Quarry

function checkDirection(direction)
    if direction == true then
        turtle.turnRight()
    else
        turtle.turnLeft()
    end
end


quarryDimensions = 16
local SLOT_COUNT = 16

DROPPED_ITEMS = {
    "minecraft:stone",
    "minecraft:dirt",
    "minecraft:cobblestone",
    "minecraft:sand",
    "minecraft:gravel",
    "minecraft:redstone",
    "minecraft:flint",
    "railcraft:ore_metal",
    "extrautils2:ingredients",
    "minecraft:dye",
    "thaumcraft:nugget",
    "thaumcraft:crystal_essence",
    "thermalfoundation:material",
    "projectred-core:resource_item",
    "thaumcraft:ore_cinnabar",
    "deepresonance:resonating_ore",
    "forestry:apatite",
    "quark:limestone"
}
function dropItems()
    print("Purging Inventory...")
    for slot = 1, SLOT_COUNT, 1 do
        local item = turtle.getItemDetail(slot)
        if(item ~= nil) then
            for filterIndex = 1, #DROPPED_ITEMS, 1 do
                if(item["name"] == DROPPED_ITEMS[filterIndex]) then
                    print("Dropping - " .. item["name"])
                    turtle.select(slot)
                    turtle.dropDown()
                end
            end
        end
    end
end

direction = true
while (5 > 1) do
    a = 0
    repeat
        i = 0
        repeat
            turtle.dig()
            turtle.forward()
            i = i + 1
        until (i > quarryDimensions-1)
        if a < quarryDimensions then
            checkDirection(direction)
            turtle.dig()
            turtle.forward()
            checkDirection(direction)
            if direction == true then
                direction = false
            else
                direction = true
            end
        else
            print("Stopped")
        end
        a = a + 1
    until (a > quarryDimensions)
    turtle.turnRight()
    j = 0
    repeat
        turtle.forward()
        j = j + 1
        print(j)
    until (j > quarryDimensions-1)
    turtle.turnRight()
    turtle.digDown()
    turtle.down()
    direction = true
    dropItems()

end