farm

function CheckSlots(slotNum, minVal)
    if turtle.getItemCount(slotNum)<minVal then
        return false
    else
        return true
    end
end

function Input()
    write("Width?")
    breite=tonumber(read())
    write("Length?")
    laenge=tonumber(read())
end

function CheckFuel()
    if turtle.getFuelLevel() < 40 and turtle.getItemCount(1) < 1 then
        print "Please but some coal in slot 1"
    end
end

function Refuel()
    if turtle.getFuelLevel() < 80 then
        turtle.refuel()
    end
end

function DetectAndReplace()
    isThere, data=turtle.inspectDown()
    if isThere then
        if data.metadata==7 then
            if data.name=="minecraft:wheat" then
                turtle.select(2)
                turtle.digDown()
                if CheckSlots(2,1) then
                    turtle.placeDown()
                else
                    write("Please put wheatseeds in slot 2")
                    while CheckSlots(2,1)==false do
                    end
                end
            end
        end
        if data.metadata==7 then
            if data.name=="minecraft:carrots" then
                turtle.select(3)
                turtle.digDown()
                if CheckSlots(3,1) then
                    turtle.placeDown()
                else
                    write("Please put carrots in slot 3")
                    while CheckSlots(3,1)==false do
                    end
                end
            end
        end
        if data.metadata==7 then
            if data.name=="minecraft:potatoes" then
                turtle.select(4)
                turtle.digDown()
                if CheckSlots(4,1) then
                    turtle.placeDown()
                else
                    write("Please put potatoes in slot 2")
                    while CheckSlots(4,1)==false do
                    end
                end
            end
        end
        return true
    else
        return false
    end
end

function Forward()
    CheckFuel()
    Refuel()
    while turtle.forward()==false do
        turtle.forward()
    end
end

function Drop()
    for i=5,16,1 do
        turtle.select(i)
        turtle.dropDown()
    end
end

function main()
    Input()
    Forward()
    while true do
        for i=1,breite-1,1 do
            for j=1,laenge-1,1 do
                DetectAndReplace()
                Forward()
            end
            if i%2==1 and l~=breite then
                turtle.turnRight()
                Forward()
                turtle.turnRight()
            elseif l~=breite then
                turtle.turnLeft()
                Forward()
                turtle.turnLeft()
            end
        end
        if(breite%2==0) then
            turtle.turnRight()
            for i=1,breite,1 do
                Forward()
            end
            turtle.turnLeft()
            Forward()
            turtle.turnLeft()
            turtle.turnLeft()
        else
            turtle.turnLeft()
            for i=1,breite,1 do
                Forward()
            end
            turtle.turnLeft()
            for i=1,laenge+1,1 do
                Forward()
            end
            turtle.turnLeft()
            turtle.turnLeft()
        end
        Drop()
        os.sleep(300)
    end
end

main()