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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 locale)
#:use-module (gnu installer locale)
#:use-module (gnu installer steps)
#:use-module (gnu installer newt page)
#:use-module (guix i18n)
#:use-module (newt)
#: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)
#:export (run-locale-page))
(define (run-language-page languages language->text)
(let ((title (G_ "Language")))
(run-listbox-selection-page
#:title title
#:info-text (G_ "Choose the language to be used for the installation \
process. The selected language will also be the default \
language for the installed system.")
#:listbox-items languages
#:listbox-item->text language->text
#:button-text (G_ "Cancel")
#:button-callback-procedure
(lambda _
(raise
(condition
(&installer-step-abort)))))))
(define (run-territory-page territories territory->text)
(let ((title (G_ "Location")))
(run-listbox-selection-page
#:title title
#:info-text (G_ "Choose your location. This is a shortlist of locations \
based on the language you selected.")
#:listbox-items territories
#:listbox-item->text territory->text
#:button-text (G_ "Back")
#:button-callback-procedure
(lambda _
(raise
(condition
(&installer-step-abort)))))))
(define (run-codeset-page codesets)
(let ((title (G_ "Codeset")))
(run-listbox-selection-page
#:title title
#:info-text (G_ "Choose your codeset. If UTF-8 is available, it should be \
preferred.")
#:listbox-items codesets
#:listbox-item->text identity
#:listbox-default-item "UTF-8"
#:button-text (G_ "Back")
#:button-callback-procedure
(lambda _
(raise
(condition
(&installer-step-abort)))))))
(define (run-modifier-page modifiers modifier->text)
(let ((title (G_ "Modifier")))
(run-listbox-selection-page
#:title title
#:info-text (G_ "Choose your modifier.")
#:listbox-items modifiers
#:listbox-item->text modifier->text
#:button-text (G_ "Back")
#:button-callback-procedure
(lambda _
(raise
(condition
(&installer-step-abort)))))))
(define* (run-locale-page #:key
supported-locales
iso639-languages
iso3166-territories)
(define (break-on-locale-found locales)
"Raise the &installer-step-break condition if LOCALES contains exactly one
element."
(and (= (length locales) 1)
(raise
(condition (&installer-step-break)))))
(define (filter-locales locales result)
"Filter the list of locale records LOCALES using the RESULT returned by
the installer-steps defined below."
(filter
(lambda (locale)
(and-map identity
`(,(string=? (locale-language locale)
(result-step result 'language))
,@(if (result-step-done? result 'territory)
(list (equal? (locale-territory locale)
(result-step result 'territory)))
'())
,@(if (result-step-done? result 'codeset)
(list (equal? (locale-codeset locale)
(result-step result 'codeset)))
'())
,@(if (result-step-done? result 'modifier)
(list (equal? (locale-modifier locale)
(result-step result 'modifier)))
'()))))
locales))
(define (result->locale-string locales result)
"Supposing that LOCALES contains exactly one locale record, turn it into a
glibc locale string and return it."
(match (filter-locales locales result)
((locale)
(locale->locale-string locale))))
(define locale-steps
(list
(installer-step
(id 'language)
(compute
(lambda _
(run-language-page
(delete-duplicates (map locale-language supported-locales))
(cut language-code->language-name iso639-languages <>)))))
(installer-step
(id 'territory)
(compute
(lambda (result)
(let ((locales (filter-locales supported-locales result)))
;; Stop the process if the language returned by the previous step
;; is matching one and only one supported locale.
(break-on-locale-found locales)
;; Otherwise, ask the user to select a territory among those
;; supported by the previously selected language.
(run-territory-page
(delete-duplicates (map locale-territory locales))
(lambda (territory-code)
(if territory-code
(territory-code->territory-name iso3166-territories
territory-code)
(G_ "No location"))))))))
(installer-step
(id 'codeset)
(compute
(lambda (result)
(let ((locales (filter-locales supported-locales result)))
;; Same as above but we now have a language and a territory to
;; narrow down the search of a locale.
(break-on-locale-found locales)
;; Otherwise, ask for a codeset.
(run-codeset-page
(delete-duplicates (map locale-codeset locales)))))))
(installer-step
(id 'modifier)
(compute
(lambda (result)
(let ((locales (filter-locales supported-locales result)))
;; Same thing with a language, a territory and a codeset this time.
(break-on-locale-found locales)
;; Otherwise, ask for a modifier.
(run-modifier-page
(delete-duplicates (map locale-modifier locales))
(lambda (modifier)
(or modifier (G_ "No modifier"))))))))))
;; If run-installer-steps returns locally, it means that the user had to go
;; through all steps (language, territory, codeset and modifier) to select a
;; locale. In that case, like if we exited by raising &installer-step-break
;; condition, turn the result into a glibc locale string and return it.
(result->locale-string
supported-locales
(run-installer-steps #:steps locale-steps)))
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