--https://pastebin.com/pXKpsQpt


function harvest()
    print ("Harvesting..")
    turtle.dig()
    turtle.suck()
end


function inspect()
    local success,i =turtle.inspect()
    if success then
        if (i.name=="minecraft:melon_block" or i.name=="minecraft:pumpkin") then
            print("Plant detected.")
            harvest()
        end
    end
end

function turn()
    turtle.turnLeft()
end

function fuel()
    local t = turtle.getFuelLevel()
    if t<50 then
        print("Fuel less then 50.Please insert fuel to resume")
        while turtle.getFuelLevel()<50 do
        for i=1,16 do
            turtle.select(i)
            turtle.refuel()
        end
        end
    end
    print("Current fuel:".. t)
end


function transfer()
    for i=1,16 do
        local t = turtle.select(i)
        local m = turtle.getItemDetail()

        if m then
            local f = m.name
            print (f)
            if (f=="minecraft:pumpkin" or f=="minecraft:melon") then
                turtle.dropDown()
                print ("Storing plants...")
            end
        end
    end
end

while true do
    fuel()
    for i=1,4 do
        inspect()
        turn()
    end
    transfer()
    os.sleep(5)
end