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Showing content from http://www.lispworks.com/documentation/lw60/CLHS/Body/v_pr_pre.htm below:

CLHS: Variable *PRINT-PRETTY*

Value Type:

a generalized boolean.

Initial Value:

implementation-dependent.

Description:

Controls whether the Lisp printer calls the pretty printer.

If it is false, the pretty printer is not used and a minimum of whitespace[1] is output when printing an expression.

If it is true, the pretty printer is used, and the Lisp printer will endeavor to insert extra whitespace[1] where appropriate to make expressions more readable.

*print-pretty* has an effect even when the value of *print-escape* is false.

Examples:

 (setq *print-pretty* 'nil) =>  NIL
 (progn (write '(let ((a 1) (b 2) (c 3)) (+ a b c))) nil)
>>  (LET ((A 1) (B 2) (C 3)) (+ A B C))
=>  NIL
 (let ((*print-pretty* t))
   (progn (write '(let ((a 1) (b 2) (c 3)) (+ a b c))) nil))
>>  (LET ((A 1)
>>        (B 2)
>>        (C 3))
>>    (+ A B C))
=>  NIL
;; Note that the first two expressions printed by this next form
;; differ from the second two only in whether escape characters are printed.
;; In all four cases, extra whitespace is inserted by the pretty printer.
 (flet ((test (x)
          (let ((*print-pretty* t))
            (print x)
            (format t "~%~S " x)
            (terpri) (princ x) (princ " ")
            (format t "~%~A " x))))
  (test '#'(lambda () (list "a" #'c #'d))))
>>  #'(LAMBDA ()
>>      (LIST "a" #'C #'D))
>>  #'(LAMBDA ()
>>      (LIST "a" #'C #'D))
>>  #'(LAMBDA ()
>>      (LIST a b 'C #'D)) 
>>  #'(LAMBDA ()
>>      (LIST a b 'C #'D))
=>  NIL

Affected By: None.

See Also:

write

Notes: None.

• FORMAT-PRETTY-PRINT:YES
• PRINTER-WHITESPACE:JUST-ONE-SPACE

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