ComputerCraft Tree Farmer

function stop(m)
    print(m)
    exit()
end

function plantTree(slot)
    turtle.select(16)
    turtle.forward()
    treeDetector = turtle.detect()
    turtle.back()
    if not(treeDetector) then
        turtle.place()
    end
end

function mineTree(a)
    local blockFront = turtle.detect()
    local tree = 0
    local tree2 = 0
    while blockFront == false do
        blockFront = turtle.detect()
        turtle.forward()
        tree = tree + 1
        if tree == tree2 + 3 then
            tree2 = tree2 + 1
            if blockFront == false then
                local aaa = turtle.detect()
                if not(aaa) then
                    plantTree(16)
                end
            end
        end
    end
    if blockFront then
        local blockType, data = turtle.inspect()
        if blockType then
            print(data.name)
            if data.name == "minecraft:log" then
                local i = 0
                while blockFront do
                    blockFront = turtle.detect()
                    i = i + 1
                    turtle.dig()
                    turtle.digUp()
                    turtle.up()
                end
                while i > 0 do
                    i = i - 1
                    turtle.down()
                end
                blockFront = turtle.detect()
            end
            if data.name == "minecraft:cobblestone" then
                turtle.turnLeft()
                chestFinder, data = turtle.inspect()
                if chestFinder and data.name == 'minecraft:chest' then
                    local i = 1
                    turtle.select(1)
                    while i <= 15 do
                        turtle.select(i)
                        i = i + 1
                        turtle.drop()
                    end
                    turtle.select(1)
                end
                turtle.turnLeft()
            end
            if data.name == 'minecraft:sapling' then
                turtle.digUp()
                turtle.up()
                turtle.dig()
                turtle.forward()
                turtle.dig()
                turtle.forward()
                turtle.digDown()
                turtle.down()
            end
            if data.name == 'minecraft:coal_block' then
                stop('Coal Block Stop The Machine')
            end
        end
    end
    mineTree()
end

mineTree()