diff options
author | Ludovic Courtès <ludo@gnu.org> | 2019-01-20 22:12:10 +0100 |
---|---|---|
committer | Ludovic Courtès <ludo@gnu.org> | 2019-01-20 22:12:10 +0100 |
commit | 3e2d4e69c340c3520f546f8c7e21e52383058d1c (patch) | |
tree | 0bc92edb753cfdf9a9e7ef763ebc19f0cd2d528c /gnu/installer/timezone.scm | |
parent | ad79ae7e2d7505292b11e87302b08f4db0f934e9 (diff) | |
parent | e5ad2cdf172eecc7edef37a500593b1941af013c (diff) | |
download | guix-patches-3e2d4e69c340c3520f546f8c7e21e52383058d1c.tar guix-patches-3e2d4e69c340c3520f546f8c7e21e52383058d1c.tar.gz |
Merge branch 'master' into staging
Diffstat (limited to 'gnu/installer/timezone.scm')
-rw-r--r-- | gnu/installer/timezone.scm | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/gnu/installer/timezone.scm b/gnu/installer/timezone.scm new file mode 100644 index 0000000000..32bc2ed6bb --- /dev/null +++ b/gnu/installer/timezone.scm @@ -0,0 +1,127 @@ +;;; 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 timezone) + #:use-module (gnu installer utils) + #: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) + #:export (locate-childrens + timezone->posix-tz + timezone-has-child? + zonetab->timezone-tree + posix-tz->configuration)) + +(define %not-blank + (char-set-complement char-set:blank)) + +(define (posix-tz->timezone tz) + "Convert given TZ in Posix format like \"Europe/Paris\" into a list like +(\"Europe\" \"Paris\")." + (string-split tz #\/)) + +(define (timezone->posix-tz timezone) + "Convert given TIMEZONE like (\"Europe\" \"Paris\") into a Posix timezone +like \"Europe/Paris\"." + (string-join timezone "/")) + +(define (zonetab->timezones zonetab) + "Parse ZONETAB file and return the corresponding list of timezones." + + (define (zonetab-line->posix-tz line) + (let ((tokens (string-tokenize line %not-blank))) + (match tokens + ((code coordinates tz _ ...) + tz)))) + + (call-with-input-file zonetab + (lambda (port) + (let* ((lines (read-lines port)) + ;; Filter comment lines starting with '#' character. + (tz-lines (filter (lambda (line) + (not (eq? (string-ref line 0) + #\#))) + lines))) + (map (lambda (line) + (posix-tz->timezone + (zonetab-line->posix-tz line))) + tz-lines))))) + +(define (timezones->timezone-tree timezones) + "Convert the list of timezones, TIMEZONES into a tree under the form: + + (\"America\" (\"North_Dakota\" \"New_Salem\" \"Center\")) + +representing America/North_Dakota/New_Salem and America/North_Dakota/Center +timezones." + + (define (remove-first lists) + "Remove the first element of every sublists in the argument LISTS." + (map (lambda (list) + (if (null? list) list (cdr list))) + lists)) + + (let loop ((cur-timezones timezones)) + (match cur-timezones + (() '()) + (((region . rest-region) . rest-timezones) + (if (null? rest-region) + (cons (list region) (loop rest-timezones)) + (receive (same-region other-region) + (partition (lambda (timezone) + (string=? (car timezone) region)) + cur-timezones) + (acons region + (loop (remove-first same-region)) + (loop other-region)))))))) + +(define (locate-childrens tree path) + "Return the childrens of the timezone indicated by PATH in the given +TREE. Raise a condition if the PATH could not be found." + (let ((extract-proc (cut map car <>))) + (match path + (() (sort (extract-proc tree) string<?)) + ((region . rest) + (or (and=> (assoc-ref tree region) + (cut locate-childrens <> rest)) + (raise + (condition + (&message + (message + (format #f (G_ "Unable to locate path: ~a.") path)))))))))) + +(define (timezone-has-child? tree timezone) + "Return #t if the given TIMEZONE any child in TREE and #f otherwise." + (not (null? (locate-childrens tree timezone)))) + +(define* (zonetab->timezone-tree zonetab) + "Return the timezone tree corresponding to the given ZONETAB file." + (timezones->timezone-tree (zonetab->timezones zonetab))) + + +;;; +;;; Configuration formatter. +;;; + +(define (posix-tz->configuration timezone) + "Return the configuration field for TIMEZONE." + `((timezone ,timezone))) |