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;;; Guile-Git --- GNU Guile bindings of libgit2
;;; Copyright © 2016 Amirouche <amirouche@hypermove.net>
;;;
;;; This file is part of Guile-Git.
;;;
;;; Guile-Git is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Guile-Git is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Guile-Git. If not, see <http://www.gnu.org/licenses/>.
(define-module (git web querystring)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 match)
#:export (querystring))
(define (string-replace string char value)
(string-map (lambda (<>) (if (eq? <> char) value <>)) string))
(define (spacy string) (string-replace string #\+ #\space))
(define (hex->char a b)
(integer->char (string->number (list->string (list a b)) 16)))
(define (unhex string)
(if (not (string-index string #\%))
string
(let loop ((chars (string->list string))
(out '()))
(match chars
((#\% a b . rest) (loop rest (cons (hex->char a b) out)))
((a . rest) (loop rest (cons a out)))
(() (list->string (reverse out)))))))
(define decode (compose unhex spacy))
(define (acons-list k v alist)
(let ((value (assoc-ref alist k)))
(if value
(let ((alist (alist-delete k alist)))
(acons k (cons v value) alist))
(acons k (list v) alist))))
(define (list->alist lst)
(let next ((lst lst)
(out '()))
(if (null? lst)
out
(next (cdr lst) (acons-list (caar lst) (cdar lst) out)))))
(define (querystring bv)
;; semi-colon and amp can be used as pair separator
(let* ((string (utf8->string bv))
(pairs (map (cut string-split <> #\=)
(append-map (cut string-split <> #\;) (string-split string #\&)))))
(list->alist (map (match-lambda ((key value) (cons (decode key) (decode value))))
pairs))))
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