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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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.
;;;
;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu installer newt timezone)
#:use-module (gnu installer steps)
#:use-module (gnu installer timezone)
#:use-module (gnu installer newt page)
#:use-module (guix i18n)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (ice-9 match)
#:use-module (ice-9 receive)
#:use-module (newt)
#:export (run-timezone-page))
;; Heigth of the listbox displaying timezones.
(define timezone-listbox-heigth (make-parameter 20))
;; Information textbox width.
(define info-textbox-width (make-parameter 40))
(define (fill-timezones listbox timezones)
"Fill the given LISTBOX with TIMEZONES. Return an association list
correlating listbox keys with timezones."
(map (lambda (timezone)
(let ((key (append-entry-to-listbox listbox timezone)))
(cons key timezone)))
timezones))
(define (run-timezone-page zonetab)
"Run a page displaying available timezones, grouped by regions. The user is
invited to select a timezone. The selected timezone, under Posix format is
returned."
(define (all-but-last list)
(reverse (cdr (reverse list))))
(define (run-page timezone-tree)
(define (loop path)
(let ((timezones (locate-childrens timezone-tree path)))
(run-listbox-selection-page
#:title (G_ "Timezone")
#:info-text (G_ "Please select a timezone.")
#:listbox-items timezones
#:listbox-item->text identity
#:button-text (if (null? path)
(G_ "Exit")
(G_ "Back"))
#:button-callback-procedure
(if (null? path)
(lambda _
(raise
(condition
(&installer-step-abort))))
(lambda _
(loop (all-but-last path))))
#:listbox-callback-procedure
(lambda (timezone)
(let* ((timezone* (append path (list timezone)))
(tz (timezone->posix-tz timezone*)))
(if (timezone-has-child? timezone-tree timezone*)
(loop timezone*)
tz))))))
(loop '()))
(let ((timezone-tree (zonetab->timezone-tree zonetab)))
(run-page timezone-tree)))
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