draw-cons-tree

Draw an ASCII picture of a cons tree.

(draw-cons-tree '(a b (c nil 1)))

[o|o]---[o|o]---[o|/]
 |       |       |      
 a       b      [o|o]---[o|o]---[o|/]
                 |       |       |      
                 c      nil      1      



(draw-cons-tree '(a b (c nil 1) (t 2 (A B C))))

[o|o]---[o|o]---[o|o]---[o|/]
 |       |       |       |      
 a       b       |      [o|o]---[o|o]---[o|/]
                 |       |       |       |      
                 |       t       2      [o|o]---[o|o]---[o|/]
                 |                       |       |       |      
                 |                       A       B       C      
                 |      
                [o|o]---[o|o]---[o|/]
                 |       |       |      
                 c      nil      1      

Vertical and horizontal lines can also be drawn with unicode box-drawing characters for prettier output if you set `draw-cons-tree-prettify' to 't.

(draw-cons-tree '((b c (1 2)) (("one" "two") e f)))

[o|o]───[o|/]
 │       │      
 │      [o|o]───[o|o]───[o|/]
 │       │       │       │      
 │       │       e       f      
 │       │      
 │      [o|o]───[o|/]
 │       │       │      
 │      one     two     
 │      
[o|o]───[o|o]───[o|/]
 │       │       │      
 b       c      [o|o]───[o|/]
                 │       │      
                 1       2      

Ported from the function library of "Scheme 9 from Empty Space" http://www.t3x.org/s9fes/draw-tree.scm.html

Library is in the public domain in keeping with the original