2 files changed, 265 insertions, 0 deletions
diff --git a/langs/language.go b/langs/language.go
new file mode 100644
index 000000000..6f3e1de64
--- /dev/null
+++ b/langs/language.go
@@ -0,0 +1,217 @@
+// 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 (
+	"sort"
+	"strings"
+
+	"github.com/gohugoio/hugo/common/maps"
+	"github.com/gohugoio/hugo/config"
+	"github.com/spf13/cast"
+)
+
+// These are the settings that should only be looked up in the global Viper
+// config and not per language.
+// This list may not be complete, but contains only settings that we know
+// will be looked up in both.
+// This isn't perfect, but it is ultimately the user who shoots him/herself in
+// the foot.
+// See the pathSpec.
+var globalOnlySettings = map[string]bool{
+	strings.ToLower("defaultContentLanguageInSubdir"): true,
+	strings.ToLower("defaultContentLanguage"):         true,
+	strings.ToLower("multilingual"):                   true,
+}
+
+// Language manages specific-language configuration.
+type Language struct {
+	Lang         string
+	LanguageName string
+	Title        string
+	Weight       int
+
+	Disabled bool
+
+	// If set per language, this tells Hugo that all content files without any
+	// language indicator (e.g. my-page.en.md) is in this language.
+	// This is usually a path relative to the working dir, but it can be an
+	// absolute directory referenece. It is what we get.
+	ContentDir string
+
+	Cfg config.Provider
+
+	// These are params declared in the [params] section of the language merged with the
+	// site's params, the most specific (language) wins on duplicate keys.
+	params map[string]interface{}
+
+	// These are config values, i.e. the settings declared outside of the [params] section of the language.
+	// This is the map Hugo looks in when looking for configuration values (baseURL etc.).
+	// Values in this map can also be fetched from the params map above.
+	settings map[string]interface{}
+}
+
+func (l *Language) String() string {
+	return l.Lang
+}
+
+// NewLanguage creates a new language.
+func NewLanguage(lang string, cfg config.Provider) *Language {
+	// Note that language specific params will be overridden later.
+	// We should improve that, but we need to make a copy:
+	params := make(map[string]interface{})
+	for k, v := range cfg.GetStringMap("params") {
+		params[k] = v
+	}
+	maps.ToLower(params)
+
+	defaultContentDir := cfg.GetString("contentDir")
+	if defaultContentDir == "" {
+		panic("contentDir not set")
+	}
+
+	l := &Language{Lang: lang, ContentDir: defaultContentDir, Cfg: cfg, params: params, settings: make(map[string]interface{})}
+	return l
+}
+
+// NewDefaultLanguage creates the default language for a config.Provider.
+// If not otherwise specified the default is "en".
+func NewDefaultLanguage(cfg config.Provider) *Language {
+	defaultLang := cfg.GetString("defaultContentLanguage")
+
+	if defaultLang == "" {
+		defaultLang = "en"
+	}
+
+	return NewLanguage(defaultLang, cfg)
+}
+
+// Languages is a sortable list of languages.
+type Languages []*Language
+
+// NewLanguages creates a sorted list of languages.
+// NOTE: function is currently unused.
+func NewLanguages(l ...*Language) Languages {
+	languages := make(Languages, len(l))
+	for i := 0; i < len(l); i++ {
+		languages[i] = l[i]
+	}
+	sort.Sort(languages)
+	return languages
+}
+
+func (l Languages) Len() int           { return len(l) }
+func (l Languages) Less(i, j int) bool { return l[i].Weight < l[j].Weight }
+func (l Languages) Swap(i, j int)      { l[i], l[j] = l[j], l[i] }
+
+// Params retunrs language-specific params merged with the global params.
+func (l *Language) Params() map[string]interface{} {
+	return l.params
+}
+
+// IsMultihost returns whether there are more than one language and at least one of
+// the languages has baseURL specificed on the language level.
+func (l Languages) IsMultihost() bool {
+	if len(l) <= 1 {
+		return false
+	}
+
+	for _, lang := range l {
+		if lang.GetLocal("baseURL") != nil {
+			return true
+		}
+	}
+	return false
+}
+
+// SetParam sets a param with the given key and value.
+// SetParam is case-insensitive.
+func (l *Language) SetParam(k string, v interface{}) {
+	l.params[strings.ToLower(k)] = v
+}
+
+// GetBool returns the value associated with the key as a boolean.
+func (l *Language) GetBool(key string) bool { return cast.ToBool(l.Get(key)) }
+
+// GetString returns the value associated with the key as a string.
+func (l *Language) GetString(key string) string { return cast.ToString(l.Get(key)) }
+
+// GetInt returns the value associated with the key as an int.
+func (l *Language) GetInt(key string) int { return cast.ToInt(l.Get(key)) }
+
+// GetStringMap returns the value associated with the key as a map of interfaces.
+func (l *Language) GetStringMap(key string) map[string]interface{} {
+	return cast.ToStringMap(l.Get(key))
+}
+
+// GetStringMapString returns the value associated with the key as a map of strings.
+func (l *Language) GetStringMapString(key string) map[string]string {
+	return cast.ToStringMapString(l.Get(key))
+}
+
+//  returns the value associated with the key as a slice of strings.
+func (l *Language) GetStringSlice(key string) []string {
+	return cast.ToStringSlice(l.Get(key))
+}
+
+// Get returns a value associated with the key relying on specified language.
+// Get is case-insensitive for a key.
+//
+// Get returns an interface. For a specific value use one of the Get____ methods.
+func (l *Language) Get(key string) interface{} {
+	local := l.GetLocal(key)
+	if local != nil {
+		return local
+	}
+	return l.Cfg.Get(key)
+}
+
+// GetLocal gets a configuration value set on language level. It will
+// not fall back to any global value.
+// It will return nil if a value with the given key cannot be found.
+func (l *Language) GetLocal(key string) interface{} {
+	if l == nil {
+		panic("language not set")
+	}
+	key = strings.ToLower(key)
+	if !globalOnlySettings[key] {
+		if v, ok := l.settings[key]; ok {
+			return v
+		}
+	}
+	return nil
+}
+
+// Set sets the value for the key in the language's params.
+func (l *Language) Set(key string, value interface{}) {
+	if l == nil {
+		panic("language not set")
+	}
+	key = strings.ToLower(key)
+	l.settings[key] = value
+}
+
+// IsSet checks whether the key is set in the language or the related config store.
+func (l *Language) IsSet(key string) bool {
+	key = strings.ToLower(key)
+
+	key = strings.ToLower(key)
+	if !globalOnlySettings[key] {
+		if _, ok := l.settings[key]; ok {
+			return true
+		}
+	}
+	return l.Cfg.IsSet(key)
+
+}
diff --git a/langs/language_test.go b/langs/language_test.go
new file mode 100644
index 000000000..8783172fb
--- /dev/null
+++ b/langs/language_test.go
@@ -0,0 +1,48 @@
+// 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 (
+	"testing"
+
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetGlobalOnlySetting(t *testing.T) {
+	v := viper.New()
+	v.Set("defaultContentLanguageInSubdir", true)
+	v.Set("contentDir", "content")
+	v.Set("paginatePath", "page")
+	lang := NewDefaultLanguage(v)
+	lang.Set("defaultContentLanguageInSubdir", false)
+	lang.Set("paginatePath", "side")
+
+	require.True(t, lang.GetBool("defaultContentLanguageInSubdir"))
+	require.Equal(t, "side", lang.GetString("paginatePath"))
+}
+
+func TestLanguageParams(t *testing.T) {
+	assert := require.New(t)
+
+	v := viper.New()
+	v.Set("p1", "p1cfg")
+	v.Set("contentDir", "content")
+
+	lang := NewDefaultLanguage(v)
+	lang.SetParam("p1", "p1p")
+
+	assert.Equal("p1p", lang.Params()["p1"])
+	assert.Equal("p1cfg", lang.Get("p1"))
+}