Common Lisp Library for Pretty Printing? e.g. pretty print a nested hash table

Question

I am new to common lisp. Is there a CL library to pretty print collections, in my case, nested hash tables?

Answer 1

If you consider writing it yourself here is a starting point using print-object. It is not implementation independend, but this works at least in LispWorks and SBCL.

(defmethod print-object ((object hash-table) stream)
  (format stream "#HASH{~{~{(~a : ~a)~}~^ ~}}"
          (loop for key being the hash-keys of object
                using (hash-value value)
                collect (list key value))))