Pretty Printing values from a hashmap

Pretty Printing values from a hashmap

[Munyoki Kilyungi]

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Hi!  Say I have a hashmap that has nested hashmaps
that I want to inspect.  Is there a way to just
printing it out on my display in a
straight-forward way without having to loop inside
the key-value pairs?  Printing a hashmap outputs
something like this:

--8<---------------cut here---------------start------------->8---
#<hash-table 7f56164e9340 2/31>
--8<---------------cut here---------------end--------------->8---

-- 
(Life is like a pencil that will surely run out,
    but will leave the beautiful writing of life.)
(D4F09EB110177E03C28E2FE1F5BBAE1E0392253F
    (hkp://keys.gnupg.net))

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Re: Pretty Printing values from a hashmap

[Munyoki Kilyungi]

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Munyoki Kilyungi <me@bonfacemunyoki.com>
anaandika:

> Hi!  Say I have a hashmap that has nested hashmaps
> that I want to inspect.  Is there a way to just
> printing it out on my display in a
> straight-forward way without having to loop inside
> the key-value pairs?  Printing a hashmap outputs
> something like this:
>
> #<hash-table 7f56164e9340 2/31>

FWIW, I've come up with something that looks like:

--8<---------------cut here---------------start------------->8---
(use-modules (ice-9 pretty-print))

(define (print-hash-map h)
  (map (lambda (x)
       (newline)
       (display (car x))
       (display ":\n")
       (map (lambda (x)
              (format #t "~a:\n" (car x))
              (pretty-print (hash-map->list cons (cdr x)))
              (newline))
            (hash-map->list cons (cdr x)))
       (newline))
     h))

(print-hash-map (hash-map->list cons (dataset-csv-reader "rand.csv")))
--8<---------------cut here---------------end--------------->8---

I think the above is clanky as I already know the
structure of my hashmap before-hand.
-- 
(Life is like a pencil that will surely run out,
    but will leave the beautiful writing of life.)
(D4F09EB110177E03C28E2FE1F5BBAE1E0392253F
    (hkp://keys.gnupg.net))

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Re: Pretty Printing values from a hashmap

[adriano]

Il giorno gio, 21/07/2022 alle 12.13 +0300, Munyoki Kilyungi ha
scritto:
> 
> Hi!  Say I have a hashmap that has nested hashmaps
> that I want to inspect.  Is there a way to just
> printing it out on my display in a
> straight-forward way without having to loop inside
> the key-value pairs?  Printing a hashmap outputs
> something like this:
> 
> --8<---------------cut here---------------start------------->8---
> #<hash-table 7f56164e9340 2/31>
> --8<---------------cut here---------------end--------------->8---
> 


The Guile pretty printer doesn't support hashmaps

I see 2 options

1) you convert your hashmap into an alist and print that

2) you extend the pretty printer to support hashmaps too and send a
patch

as for the 2nd option, I was suggested to do so myself, not so long ago

but I couldn't bring myself to do that