GNU bug report logs - #19177
25.0.50; pretty printer

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Leo Liu <sdl.web <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; pretty printer
Date: Tue, 25 Nov 2014 19:04:03 +0800

The very limited pp.el can easily print hundreds of lines for what can
be beautifully put into dozens of lines. This makes the pp'd text hard
to read.

In the following example, pp would print nearly 300 lines while SBCL's
pprint only prints 50ish lines:

([1 ((env nil) (bound nil) (free nil)) ]
 (([1 ((env nil) (bound nil) (free nil)) ]))
 (([1 ((env nil) (bound (f tree)) (free nil)) ]
   (([1 ((env nil) (bound (f)) (free nil)) ])
    ([1 ((env nil) (bound (tree)) (free nil)) ]))
   (([2 ((env (f tree)) (bound nil) (free (f tree))) ]
     (([2 ((env (f tree)) (bound nil) (free (tree))) ]
       (([2 ((env (f tree)) (bound nil) (free nil)) ]
         (([2 ((env (f tree)) (bound nil) (free nil)) ]))
         (([2 ((env (f tree)) (bound nil) (free nil)) ]))))
       (([2 ((env (f tree)) (bound nil) (free (tree))) ]))))
     (([3 ((env (f tree)) (bound nil) (free (f tree))) ]
       (([3 ((env (f tree)) (bound nil) (free nil)) ]))
       (([4 ((env (f tree)) (bound nil) (free (f tree))) ]
         (([4 ((env (f tree)) (bound nil) (free (f))) ]))
         (([4 ((env (f tree)) (bound nil) (free (tree))) ])))))
      ([5 ((env (f tree)) (bound (gs tree1)) (free (f tree))) ]
       (([5 ((env (f tree)) (bound (gs)) (free nil)) ]))
       (([6 ((env (f gs tree)) (bound (tree1)) (free (f gs tree))) ]
         (([6 ((env (f gs tree)) (bound (tree1)) (free nil)) ]))
         (([6 ((env (f gs tree)) (bound nil) (free (f gs tree))) ]
           (([6 ((env (f gs tree)) (bound nil) (free nil)) ]
             (([6 ((env (f gs tree)) (bound nil) (free nil)) ]))
             (([6 ((env (f gs tree)) (bound nil) (free nil)) ]))))
           (([6 ((env (f gs tree)) (bound nil) (free (tree))) ]
             (([6 ((env (f gs tree)) (bound nil) (free nil)) ]
               (([6 ((env (f gs tree)) (bound nil) (free nil)) ]))
               (([6 ((env (f gs tree)) (bound nil) (free nil)) ]))))
             (([6 ((env (f gs tree)) (bound nil) (free (tree))) ])))
            ([7 ((env (f gs tree)) (bound nil) (free (f gs))) ]
             (([7 ((env (f g gs tree)) (bound nil) (free (f g))) ]
               (([7 ((env (f g gs t tree)) (bound nil) (free (f t))) ]
                 (([7 ((env (f g gs t tree)) (bound nil) (free nil)) ]))
                 (([7 ((env (f g gs t tree)) (bound nil) (free (f))) ])
                  ([7 ((env (f g gs t tree)) (bound nil) (free (t))) ]))))
               (([7 ((env (f g gs tree)) (bound (t)) (free (g))) ]
                 (([7 ((env nil) (bound (t)) (free nil)) ]))
                 (([7 ((env (f g gs tree)) (bound nil) (free (g))) ]))))))
             (([8 ((env (f gs tree)) (bound (g)) (free (gs))) ]
               (([8 ((env nil) (bound (g)) (free nil)) ]))
               (([8 ((env (f gs tree)) (bound nil) (free (gs))) ])))))))))
        ([9 ((env (f gs tree tree1)) (bound nil) (free (f tree tree1))) ]
         (([9 ((env (f gs tree tree1)) (bound nil) (free (f))) ]))
         (([9 ((env (f gs tree tree1)) (bound nil) (free (tree tree1))) ]
           (([9 ((env (f gs tree tree1)) (bound nil) (free nil)) ]
             (([9 ((env (f gs tree tree1)) (bound nil) (free nil)) ]))
             (([9 ((env (f gs tree tree1)) (bound nil) (free nil)) ]))))
           (([9 ((env (f gs tree tree1)) (bound nil) (free (tree))) ])
            ([9 ((env (f gs tree tree1)) (bound nil) (free (tree1)))
             ])))))))))))))

Message #8 received at 19177 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Leo Liu <sdl.web <at> gmail.com>
Cc: 19177 <at> debbugs.gnu.org
Subject: Re: bug#19177: 25.0.50; pretty printer
Date: Sat, 03 Aug 2019 16:14:07 +0200

Leo Liu <sdl.web <at> gmail.com> writes:

> The very limited pp.el can easily print hundreds of lines for what can
> be beautifully put into dozens of lines. This makes the pp'd text hard
> to read.
>
> In the following example, pp would print nearly 300 lines while SBCL's
> pprint only prints 50ish lines:
>
> ([1 ((env nil) (bound nil) (free nil)) ]
>  (([1 ((env nil) (bound nil) (free nil)) ]))
>  (([1 ((env nil) (bound (f tree)) (free nil)) ]

[...]

>            (([9 ((env (f gs tree tree1)) (bound nil) (free (tree))) ])
>             ([9 ((env (f gs tree tree1)) (bound nil) (free (tree1)))
>              ])))))))))))))

(I'm going through old bug reports that unfortunately have not received
any responses yet.)

I see that SBCL's pretty-printer has its oddities, too -- the space
before the "]" and a newline at one point...

Anyway, `pp' prints arrays in pretty much the same way it prints lists,
and I think this makes sense, and it pretty readable.  (If a bit
verbose.)  So I'm closing this bug report as a "wontfix".

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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