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(define-module (calp html util)
:use-module ((base64) :select (base64encode base64decode))
:use-module (util))
;;; @var{html-attr} & @var{html-unattr} used to just strip any
;;; attributes not valid in css. That allowed a human reader to
;;; quickly see what data it was. The downside was that it was one
;;; way. The new base64 based system supports both an encode and a
;;; decode without problem.
;;;
;;; The encoded string substitutes { + => å, / => ä, = => ö } to be
;;; valid CSS selector names.
;; Retuns an HTML-safe version of @var{str}.
(define-public (html-attr str)
(string-map (lambda (c)
(case c
((#\+) #\å)
((#\/) #\ä)
((#\=) #\ö)
(else c)))
(base64encode str)))
(define-public (html-unattr str)
(base64decode
(string-map (lambda (c)
(case c
((#\å) #\+)
((#\ä) #\/)
((#\ö) #\=)
(else c)))
str)))
(define-public (date-link date)
((@ (datetime) date->string) date "~Y-~m-~d"))
;; Generate an html id for an event.
;; TODO? same event placed multiple times, when spanning multiple cells
(define-public html-id
(let ((id (make-object-property)))
(lambda (ev)
(or (id ev)
(set/r! (id ev) (symbol->string (gensym "__html_id_")))))))
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