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;;; Commentary:
;; Common code between all serializers.
;; (ical and xcal). Not for graphical output stuff.
;;; Code:
(define-module (output common)
:use-module (util)
:use-module (srfi srfi-1)
:use-module (vcomponent)
)
(define*-public (internal-field? symbol optional: (prefix "X-HNH-"))
(string=? prefix
(string-take-to (symbol->string symbol)
(string-length prefix))))
(define-public (->string a)
(with-output-to-string (lambda () (display a))))
(define-public (get-tz-names events)
(lset-difference
equal? (lset-union
equal? '("dummy")
(filter-map
(lambda (vline) (and=> (param vline 'TZID) car))
(filter-map (extract* 'DTSTART)
events)))
'("dummy" "local")))
(define-public (downcase-symbol symb)
(-> symb
symbol->string
string-downcase
string->symbol))
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