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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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 build locale)
#:use-module (guix build utils)
#:use-module (srfi srfi-1)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:export (build-locale
normalize-codeset
locale->name+codeset
read-supported-locales))
(define locale-rx
;; Regexp matching a locale line in 'localedata/SUPPORTED'.
(make-regexp
"^[[:space:]]*([[:graph:]]+)/([[:graph:]]+)[[:space:]]*\\\\$"))
(define (read-supported-locales port)
"Read the 'localedata/SUPPORTED' file from PORT. That file is actually a
makefile snippet, with one locale per line, and a header that can be
discarded."
(let loop ((locales '()))
(define line
(read-line port))
(cond ((eof-object? line)
(reverse locales))
((string-prefix? "#" (string-trim line)) ;comment
(loop locales))
((string-contains line "=") ;makefile variable assignment
(loop locales))
(else
(match (regexp-exec locale-rx line)
(#f
(loop locales))
(m
(loop (alist-cons (match:substring m 1)
(match:substring m 2)
locales))))))))
(define (normalize-codeset codeset)
"Compute the \"normalized\" variant of CODESET."
;; info "(libc) Using gettextized software", for the algorithm used to
;; compute the normalized codeset.
(letrec-syntax ((-> (syntax-rules ()
((_ proc value)
(proc value))
((_ proc rest ...)
(proc (-> rest ...))))))
(-> (lambda (str)
(if (string-every char-set:digit str)
(string-append "iso" str)
str))
string-downcase
(lambda (str)
(string-filter char-set:letter+digit str))
codeset)))
(define* (build-locale locale
#:key
(localedef "localedef")
(directory ".")
(codeset "UTF-8")
(name (string-append locale "." codeset)))
"Compute locale data for LOCALE and CODESET--e.g., \"en_US\" and
\"UTF-8\"--with LOCALEDEF, and store it in DIRECTORY under NAME."
(format #t "building locale '~a'...~%" name)
(invoke localedef "--no-archive" "--prefix" directory
"-i" locale "-f" codeset
(string-append directory "/" name)))
(define (locale->name+codeset locale)
"Split a locale name such as \"aa_ER@saaho.UTF-8\" into two values: the
language/territory/modifier part, and the codeset."
(match (string-rindex locale #\.)
(#f (values locale #f))
(dot (values (string-take locale dot)
(string-drop locale (+ dot 1))))))
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