Farming

-- data entry --
local Args = {...}

if #Args ~= 2 then
    print("Usage: farm <length> <width>")
    return
end

-- vars --
lenght = tonumber ( Args[1] )
lenght1 = tonumber ( Args[1] )
width = tonumber ( Args[2] )

-- check fuel level --
function checkfuel()
    --term.clear()
    print( "Fuel level is "..turtle.getFuelLevel() )

    if turtle.getFuelLevel() < 80 then
        print("Add coal on inventory!")
        for n=1,16 do
            local nCount = turtle.getItemCount(n)
            if nCount > 0 then
                turtle.select( n )
                if turtle.refuel(1) then
                    print( "New Fuel level is "..turtle.getFuelLevel() )
                end
            end
        end
    end
end

function task()
    checkfuel()
    turtle.forward()
    turtle.digDown()
    turtle.down()
    turtle.suckDown()
    turtle.up()
    turtle.digDown()
    turtle.select( 1 )
    if turtle.placeDown() then
        lenght = lenght - 1
    else
        turtle.select(2)
        if turtle.placeDown() then
            lenght = lenght - 1
        else
            turtle.select(3)
            if turtle.placeDown() then
                lenght = lenght - 1
                if lenght == 0 then
                    turtle.turtleRight()
                    turtle.forward()
                    turtle.turnLeft()
                    width = width - 1
                end
            else
                print("please add seeds on slot 1,2 and 3")
            end
        end
    end
end

function task1()
    checkfuel()
    turtle.forward()
    turtle.digDown()
    turtle.down()
    turtle.suckDown()
    turtle.up()
    turtle.digDown()
    turtle.select( 1 )
    if turtle.placeDown() then
        lenght = lenght + 1
    else
        turtle.select(2)
        if turtle.placeDown() then
            lenght = lenght + 1
        else
            turtle.select(3)
            if turtle.placeDown() then
                lenght = lenght + 1
                if lenght == lenght1 then
                    turtle.turtleLeft()
                    turtle.forward()
                    turtle.turnRight()
                    width = width - 1
                end
            else
                print("please add seeds on slot 1,2 and 3")
            end
        end
    end
end

-- loop --
function fLoop()
    while width > 0 do
        while lenght > 0 do
            task()
        end

        while lenght < 0 do
            task1()
        end
    end
end

function fStart()
    term.clear()
    print("==== starting planting ====")
    print("please add seeds on slot 1,2 and 3")
    sleep(2)
    turtle.turnRight()
    turtle.turnRight()
    fLoop()
end

-- program --
fStart()