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// Copyright 2018 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package langs
import (
"fmt"
"path/filepath"
"sort"
"strings"
"github.com/gohugoio/hugo/common/maps"
"github.com/spf13/cast"
"github.com/pkg/errors"
"github.com/gohugoio/hugo/config"
)
type LanguagesConfig struct {
Languages Languages
Multihost bool
DefaultContentLanguageInSubdir bool
}
func LoadLanguageSettings(cfg config.Provider, oldLangs Languages) (c LanguagesConfig, err error) {
defaultLang := strings.ToLower(cfg.GetString("defaultContentLanguage"))
if defaultLang == "" {
defaultLang = "en"
cfg.Set("defaultContentLanguage", defaultLang)
}
var languages map[string]interface{}
languagesFromConfig := cfg.GetStringMap("languages")
disableLanguages := cfg.GetStringSlice("disableLanguages")
if len(disableLanguages) == 0 {
languages = languagesFromConfig
} else {
languages = make(map[string]interface{})
for k, v := range languagesFromConfig {
for _, disabled := range disableLanguages {
if disabled == defaultLang {
return c, fmt.Errorf("cannot disable default language %q", defaultLang)
}
if strings.EqualFold(k, disabled) {
v.(map[string]interface{})["disabled"] = true
break
}
}
languages[k] = v
}
}
var languages2 Languages
if len(languages) == 0 {
languages2 = append(languages2, NewDefaultLanguage(cfg))
} else {
languages2, err = toSortedLanguages(cfg, languages)
if err != nil {
return c, errors.Wrap(err, "Failed to parse multilingual config")
}
}
if oldLangs != nil {
// When in multihost mode, the languages are mapped to a server, so
// some structural language changes will need a restart of the dev server.
// The validation below isn't complete, but should cover the most
// important cases.
var invalid bool
if languages2.IsMultihost() != oldLangs.IsMultihost() {
invalid = true
} else {
if languages2.IsMultihost() && len(languages2) != len(oldLangs) {
invalid = true
}
}
if invalid {
return c, errors.New("language change needing a server restart detected")
}
if languages2.IsMultihost() {
// We need to transfer any server baseURL to the new language
for i, ol := range oldLangs {
nl := languages2[i]
nl.Set("baseURL", ol.GetString("baseURL"))
}
}
}
// The defaultContentLanguage is something the user has to decide, but it needs
// to match a language in the language definition list.
langExists := false
for _, lang := range languages2 {
if lang.Lang == defaultLang {
langExists = true
break
}
}
if !langExists {
return c, fmt.Errorf("site config value %q for defaultContentLanguage does not match any language definition", defaultLang)
}
c.Languages = languages2
c.Multihost = languages2.IsMultihost()
c.DefaultContentLanguageInSubdir = c.Multihost
sortedDefaultFirst := make(Languages, len(c.Languages))
for i, v := range c.Languages {
sortedDefaultFirst[i] = v
}
sort.Slice(sortedDefaultFirst, func(i, j int) bool {
li, lj := sortedDefaultFirst[i], sortedDefaultFirst[j]
if li.Lang == defaultLang {
return true
}
if lj.Lang == defaultLang {
return false
}
return i < j
})
cfg.Set("languagesSorted", c.Languages)
cfg.Set("languagesSortedDefaultFirst", sortedDefaultFirst)
cfg.Set("multilingual", len(languages2) > 1)
multihost := c.Multihost
if multihost {
cfg.Set("defaultContentLanguageInSubdir", true)
cfg.Set("multihost", true)
}
if multihost {
// The baseURL may be provided at the language level. If that is true,
// then every language must have a baseURL. In this case we always render
// to a language sub folder, which is then stripped from all the Permalink URLs etc.
for _, l := range languages2 {
burl := l.GetLocal("baseURL")
if burl == nil {
return c, errors.New("baseURL must be set on all or none of the languages")
}
}
}
return c, nil
}
func toSortedLanguages(cfg config.Provider, l map[string]interface{}) (Languages, error) {
languages := make(Languages, len(l))
i := 0
for lang, langConf := range l {
langsMap, err := maps.ToStringMapE(langConf)
if err != nil {
return nil, fmt.Errorf("Language config is not a map: %T", langConf)
}
language := NewLanguage(lang, cfg)
for loki, v := range langsMap {
switch loki {
case "title":
language.Title = cast.ToString(v)
case "languagename":
language.LanguageName = cast.ToString(v)
case "languagedirection":
language.LanguageDirection = cast.ToString(v)
case "weight":
language.Weight = cast.ToInt(v)
case "contentdir":
language.ContentDir = filepath.Clean(cast.ToString(v))
case "disabled":
language.Disabled = cast.ToBool(v)
case "params":
m := maps.ToStringMap(v)
// Needed for case insensitive fetching of params values
maps.ToLower(m)
for k, vv := range m {
language.SetParam(k, vv)
}
}
// Put all into the Params map
language.SetParam(loki, v)
// Also set it in the configuration map (for baseURL etc.)
language.Set(loki, v)
}
languages[i] = language
i++
}
sort.Sort(languages)
return languages, nil
}
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