github.com/david-imola/snapd@v0.0.0-20210611180407-2de8ddeece6d/i18n/i18n.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2014-2015 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package i18n
    21  
    22  //go:generate update-pot
    23  
    24  import (
    25  	"fmt"
    26  	"os"
    27  	"path/filepath"
    28  	"strings"
    29  
    30  	"github.com/snapcore/go-gettext"
    31  
    32  	"github.com/snapcore/snapd/dirs"
    33  	"github.com/snapcore/snapd/osutil"
    34  )
    35  
    36  // TEXTDOMAIN is the message domain used by snappy; see dgettext(3)
    37  // for more information.
    38  var (
    39  	TEXTDOMAIN   = "snappy"
    40  	locale       gettext.Catalog
    41  	translations gettext.Translations
    42  )
    43  
    44  func init() {
    45  	bindTextDomain(TEXTDOMAIN, "/usr/share/locale")
    46  	setLocale("")
    47  }
    48  
    49  func langpackResolver(baseRoot string, locale string, domain string) string {
    50  	// first check for the real locale (e.g. de_DE)
    51  	// then try to simplify the locale (e.g. de_DE -> de)
    52  	locales := []string{locale, strings.SplitN(locale, "_", 2)[0]}
    53  	for _, locale := range locales {
    54  		r := filepath.Join(locale, "LC_MESSAGES", fmt.Sprintf("%s.mo", domain))
    55  
    56  		// look into the core snaps first for translations,
    57  		// then the main system
    58  		candidateDirs := []string{
    59  			filepath.Join(dirs.SnapMountDir, "/core/current/", baseRoot),
    60  			baseRoot,
    61  		}
    62  		for _, root := range candidateDirs {
    63  			// ubuntu uses /usr/lib/locale-langpack and patches the glibc gettext
    64  			// implementation
    65  			langpack := filepath.Join(root, "..", "locale-langpack", r)
    66  			if osutil.FileExists(langpack) {
    67  				return langpack
    68  			}
    69  
    70  			regular := filepath.Join(root, r)
    71  			if osutil.FileExists(regular) {
    72  				return regular
    73  			}
    74  		}
    75  	}
    76  
    77  	return ""
    78  }
    79  
    80  func bindTextDomain(domain, dir string) {
    81  	translations = gettext.NewTranslations(dir, domain, langpackResolver)
    82  }
    83  
    84  func setLocale(loc string) {
    85  	if loc == "" {
    86  		loc = localeFromEnv()
    87  	}
    88  
    89  	locale = translations.Locale(simplifyLocale(loc))
    90  }
    91  
    92  func simplifyLocale(loc string) string {
    93  	// de_DE.UTF-8, de_DE@euro all need to get simplified
    94  	loc = strings.Split(loc, "@")[0]
    95  	loc = strings.Split(loc, ".")[0]
    96  
    97  	return loc
    98  }
    99  
   100  func localeFromEnv() string {
   101  	loc := os.Getenv("LC_MESSAGES")
   102  	if loc == "" {
   103  		loc = os.Getenv("LANG")
   104  	}
   105  
   106  	return loc
   107  }
   108  
   109  // CurrentLocale returns the current locale without encoding or variants.
   110  func CurrentLocale() string {
   111  	return simplifyLocale(localeFromEnv())
   112  }
   113  
   114  // G is the shorthand for Gettext
   115  func G(msgid string) string {
   116  	return locale.Gettext(msgid)
   117  }
   118  
   119  // https://www.gnu.org/software/gettext/manual/html_node/Plural-forms.html
   120  // (search for 1000)
   121  func ngn(d int) uint32 {
   122  	const max = 1000000
   123  	if d < 0 {
   124  		d = -d
   125  	}
   126  	if d > max {
   127  		return uint32((d % max) + max)
   128  	}
   129  	return uint32(d)
   130  }
   131  
   132  // NG is the shorthand for NGettext
   133  func NG(msgid string, msgidPlural string, n int) string {
   134  	return locale.NGettext(msgid, msgidPlural, ngn(n))
   135  }