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;;; Harmonic Flow web site
(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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