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(define-module (datetime instance)
:use-module (hnh util)
:use-module (calp util config)
:use-module (hnh util exceptions)
:use-module ((hnh util path) :select (path-append))
:use-module (datetime zic)
:use-module ((xdg basedir) :prefix xdg-)
:use-module (calp translation)
:export (zoneinfo))
(define-config tz-list '()
description: (G_ "List of default zoneinfo files to be parsed"))
;; TODO see (vcomponent uil instance), this has a similar problem with early load
;; Takes a list of zoneinfo files relative
;; $XDG-DATA-HOME/calp/zoneinfo, which will probably be
;; '("tzdata/europe" "tzdata/afrifa" ...)
;; and builds all these into one giant zoneinfo database object
;; Note that scripts/tzget should be run beforehand, to download the
;; data
(define-once zoneinfo
(let ((cache (make-hash-table)))
(label self
(case-lambda
(()
(define tz-list (tz-list))
(if (null? tz-list)
(warning (G_ "Default zoneinfo only available when tz-dir and tz-list are configured"))
(self tz-list)))
((file-list)
(provide 'zoneinfo)
(let* ((directory (path-append (xdg-data-home) "/calp/zoneinfo"))
(key (cons directory file-list)))
(aif (hash-ref cache key)
it
(let ((tz (read-zoneinfo
(map (lambda (s) (path-append directory s))
file-list))))
(hash-set! cache key tz)
tz))))))))
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