SLIME wraps in ABCL in a manner that doesn't use the TOP-LEVEL:REPL function so one doesn't get pretty printed output by default. If I define SWANK::PRESENT-REPL-RESULTS-WITH-PPRINT as below, and bind it as the value of SWANK::*SEND-REPL-RESULTS-FUNCTION*, the the pretty printer is used for ABCL output under SLIME. But I can't just stick this in the "~/.swank.lisp" file, as the value of swank::*send-repl-results-function* gets reset when contrib/swank-presentations.lisp is loaded making me think "I'm doing it wrong." Is the ABCL/SLIME implementation somehow wrong in not using the TOP-LEVEL:REPL routines for evaluation? How does one configure contrib contributions if not in "~/.swank.lisp"? Does ABCL need to be fixed here, or SLIME, or both? (defun present-repl-results-with-pprint (values) ;; Override a function in swank.lisp, so that ;; presentations are associated with every REPL result. (labels ((pprint-value (value) (let ((pprint-results (with-output-to-string (s) (pprint value s)))) (subseq pprint-results 1))) ;; Strip preceding newline of pprint (send (value) (let ((id (and *record-repl-results* (save-presented-object value)))) (send-to-emacs `(:presentation-start ,id :repl-result)) (send-to-emacs `(:write-string ,(pprint-value value) :repl-result)) (send-to-emacs `(:presentation-end ,id :repl-result)) (send-to-emacs `(:write-string ,(string #\Newline) :repl-result))))) (fresh-line) (finish-output) (if (null values) (send-to-emacs `(:write-string "; No value" :repl-result)) (mapc #'send values)))) -- "A screaming comes across the sky. It has happened before, but there is nothing to compare to it now."