ObsiFarmer

function refuel()
        if turtle.getFuelLevel() ~= "unlimited" and turtle.getFuelLevel() < 1 then
                turtle.select(1)

                if not turtle.refuel(0) then
                        display('Need fuel in slot 1')
                end

                while turtle.refuel(0) == false do
                end

                turtle.refuel(1)
        end
end


function getSlotOf(itemID)
        for i=1,16 do
                turtle.select(i)
                local details = turtle.getItemDetail()
                if details ~= nil then
                        if details.name == itemID then
                                return i,details.count
                        end
                end
        end
        return 0
end

repeat
    refuel()
    i = getSlotOf('minecraft:redstone')
    if i == 0 then
        display('Plus de redstone')
        return
    else
        turtle.select(i)
        turtle.place()
		repeat
      		success, data = turtle.inspect()
    	until data.name == 'minecraft:obsidian'
		turtle.dig()
    end
until false