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From: Hartmut Goebel <h.goebel@crazy-compilers.com>
To: guile-user@gnu.org
Subject: Simple list of key-value pairs?
Date: Thu, 8 Jul 2021 16:37:09 +0200	[thread overview]
Message-ID: <410e7168-3709-c961-c894-d534782ef526@crazy-compilers.com> (raw)

Hi,

I'm seeking advice for passing simple key-value pairs to a function and 
generate a string out of these values. Neither the names not the number 
of keys is known in advance.

Background: This shall become a generic function for generating URI 
query-strings.

My current approach please see below. Anyhow, I'm wondering whether the 
quite and quasiquote can be replaced by something simpler.

(use-modules (ice-9 match))

(define limit 100)
(define evaluation "linux")

(define* (api-uri base path #:rest query)

   (define (build-query-string kv)
     (match kv
        ((name #f) #f)
        ((name (? string? value))
         (string-append name "=" value))  ; FIXME: encode
        ((name (? number? value))
         (string-append name "=" (number->string value)))))


   (format #t "~%Query: ~a~%~%" query)
   (let ((query-string
      (when query
        (string-join
         (filter (lambda (x) x) (map build-query-string query))
         "&"))))
     (format #t "~%Query-String: ~a~%~%" query-string)
     ;; todo: build uri incl. query-string
   ))


(api-uri "https://ci.guix.gnu.org" "/api/jobs")
(api-uri "https://ci.guix.gnu.org" "/api/jobs"
      `("nr" ,limit)
      `("evaluation" ,evaluation)
      `("system" ,#f))

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |




             reply	other threads:[~2021-07-08 14:37 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-08 14:37 Hartmut Goebel [this message]
2021-07-08 15:22 ` Simple list of key-value pairs? Christopher Lam
2021-07-08 18:59 ` Luis Felipe
2021-07-09 11:31 ` Zelphir Kaltstahl
2021-07-09 22:37   ` Aleix Conchillo Flaqué
2021-07-09 11:55 ` Tim Van den Langenbergh

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