Hafiz and Sufism

It is very long debate about the character of the Hafiz, both among Iranian writers and non Iranian writers that he has been a Sufi or not. Some argue he has been and some say otherwise. I, as I brought in my book "Similarities in the World Outlooks of Khwaja Hafiz Shirazi and Hakim Umar Khayyam", believe that according to his Ghazals, he has been Sufi for a short time, but...