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;;; GNU Guix web site
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.org>
;;;
;;; This file is part of the GNU Guix web site.
;;;
;;; The GNU Guix web site 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.
;;;
;;; The GNU Guix web site 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 the GNU Guix web site. If not, see <http://www.gnu.org/licenses/>.
(define-module (apps aux web)
#:use-module (srfi srfi-1)
#:export (slugify
url-path-join))
;;;
;;; Variables.
;;;
(define char-set:slug
(char-set-union char-set:letter+digit (char-set #\-)))
;;;
;;; Procedures.
;;;
(define (slugify text)
"Return TEXT as a slug.
Reserved characters for Internationalized Resource Identifiers
(IRIs) and common reserved characters for file names are removed
using the SLUG_FORBIDDEN constant as reference.
TEXT (string)
Some text. For example: Biology, Human anatomy.
RETURN VALUE (string)
A slug-like string. For example: biology, human-anatomy."
(string-join
(map (lambda (s) (string-filter char-set:slug s))
(string-split (string-downcase text) char-set:whitespace))
"-"))
(define (url-path-join . parts)
"Return a URL path composed of the given PARTS.
PARTS (strings)
A succession of strings that represent parts of a URL path.
To indicate an absolute path, use an empty string as the first
part. For example:
(url-path-join '' 'docs' 'manual')
=> '/docs/manual'
To end the path with a slash, use an empty string as the last
part. For example:
(url-path-join '' 'docs' 'manual' '')
=> '/docs/manual/'
RETURN VALUE (string)
A string representing a URL path."
(cond ((equal? parts '("")) "/") ; Root directory
(else (string-join parts "/"))))
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