try 2

cmd/site/html.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/Unknwon/i18n"
 	"github.com/Xe/ln"
 )
 
@@ -21,7 +22,32 @@ func (s *Site) renderTemplatePage(templateFname string, data interface{}) http.H
 		s.tlock.RLock()
 		defer s.tlock.RUnlock()
 
-		var t *template.Template
+		const fallbackLang = `en-US`
+
+		getTranslation := func(group, key string, vals ...interface{}) string {
+			var lang string
+			locale, err := GetPreferredLocale(r)
+			if err != nil {
+				ln.Error(r.Context(), err)
+				lang = fallbackLang
+				goto skip
+			}
+
+			if !i18n.IsExist(locale.Lang) {
+				lang = fallbackLang
+				goto skip
+			}
+
+			lang = locale.Lang
+		skip:
+			return i18n.Tr(lang, group+"."+key, vals...)
+		}
+
+		funcMap := template.FuncMap{
+			"trans": getTranslation,
+		}
+
+		var t = template.New(templateFname).Funcs(funcMap)
 		var err error
 
 		if s.templates[templateFname] == nil {

cmd/site/locale.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"errors"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+// Locale is locale value from the Accept-Language header in request
+type Locale struct {
+	Lang, Country string
+	Qual          float64
+}
+
+// Name returns the locale value in 'lang' or 'lang_country' format
+// eg: de_DE, en_US, gb
+func (l *Locale) Name() string {
+	if len(l.Country) > 0 {
+		return l.Lang + "_" + l.Country
+	}
+	return l.Lang
+}
+
+// ParseLocale creates a Locale from a locale string
+func ParseLocale(locale string) Locale {
+	locsplt := strings.Split(locale, "_")
+	resp := Locale{}
+	resp.Lang = locsplt[0]
+	if len(locsplt) > 1 {
+		resp.Country = locsplt[1]
+	}
+	return resp
+}
+
+const (
+	acceptLanguage = "Accept-Language"
+)
+
+func supportedLocales(alstr string) []Locale {
+	locales := make([]Locale, 0)
+	alstr = strings.Replace(alstr, " ", "", -1)
+	if alstr == "" {
+		return locales
+	}
+	al := strings.Split(alstr, ",")
+	for _, lstr := range al {
+		locales = append(locales, Locale{
+			Lang:    parseLang(lstr),
+			Country: parseCountry(lstr),
+			Qual:    parseQual(lstr),
+		})
+	}
+	return locales
+}
+
+// GetLocales returns supported locales for the given requet
+func GetLocales(r *http.Request) []Locale {
+	return supportedLocales(r.Header.Get(acceptLanguage))
+}
+
+// GetPreferredLocale return preferred locale for the given reuqest
+// returns error if there is no preferred locale
+func GetPreferredLocale(r *http.Request) (*Locale, error) {
+	locales := GetLocales(r)
+	if len(locales) == 0 {
+		return &Locale{}, errors.New("No locale found")
+	}
+	return &locales[0], nil
+}
+
+func parseLang(val string) string {
+	locale := strings.Split(val, ";")[0]
+	lang := strings.Split(locale, "-")[0]
+	return lang
+}
+
+func parseCountry(val string) string {
+	locale := strings.Split(val, ";")[0]
+	spl := strings.Split(locale, "-")
+	if len(spl) > 1 {
+		return spl[1]
+	}
+	return ""
+}
+
+func parseQual(val string) float64 {
+	spl := strings.Split(val, ";")
+	if len(spl) > 1 {
+		qual, err := strconv.ParseFloat(strings.Split(spl[1], "=")[1], 64)
+		if err != nil {
+			return 1
+		}
+		return qual
+	}
+	return 1
+}

cmd/site/main.go

@@ -12,6 +12,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/Unknwon/i18n"
 	"github.com/Xe/jsonfeed"
 	"github.com/Xe/ln"
 	"github.com/gorilla/feeds"
@@ -62,6 +63,10 @@ func Build() (*Site, error) {
 		Date  string
 	}
 
+	i18n.SetMessage("en-US", "conf/locale/locale_en-US.ini")
+	i18n.SetMessage("toki", "conf/locale/locale_toki.ini")
+	i18n.SetDefaultLang("en-US")
+
 	s := &Site{
 		rssFeed: &feeds.Feed{
 			Title:       "Christine Dodrill's Blog",

go.mod

@@ -1,6 +1,7 @@
 module github.com/Xe/site
 
 require (
+	github.com/Unknwon/i18n v0.0.0-20171114194641-b64d33658966 // indirect
 	github.com/Xe/gopreload v0.0.0-20170326043426-a00a8beb369c
 	github.com/Xe/jsonfeed v0.0.0-20170520170432-e21591505612
 	github.com/Xe/ln v0.0.0-20170921000907-466e05b2ef3e
@@ -17,5 +18,6 @@ require (
 	github.com/stretchr/testify v1.2.2 // indirect
 	github.com/tj/front v0.0.0-20170212063142-739be213b0a1
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
+	gopkg.in/ini.v1 v1.39.0 // indirect
 	gopkg.in/yaml.v1 v1.0.0-20140924161607-9f9df34309c0 // indirect
 )

go.sum

@@ -1,3 +1,5 @@
+github.com/Unknwon/i18n v0.0.0-20171114194641-b64d33658966 h1:Mp8GNJ/tdTZIEdLdZfykEJaL3mTyEYrSzYNcdoQKpJk=
+github.com/Unknwon/i18n v0.0.0-20171114194641-b64d33658966/go.mod h1:SFtfq0zFPsENI7DpE87QM2hcYu5QQ0fRdCgP+P1Hrqo=
 github.com/Xe/gopreload v0.0.0-20170326043426-a00a8beb369c h1:lqTJqaoonxgJMvvfl1ukr/3qCEGWC0nQxzPezbJrhHs=
 github.com/Xe/gopreload v0.0.0-20170326043426-a00a8beb369c/go.mod h1:0aSWHJguPNHo6zlU7A4Ktua1A/VUr5Jdr1QZ2amOkAQ=
 github.com/Xe/jsonfeed v0.0.0-20170520170432-e21591505612 h1:5cPld6YTMozzm3lK9VCnOErgoFbADM2hZc4KDu0YNKs=
@@ -33,5 +35,7 @@ github.com/tj/front v0.0.0-20170212063142-739be213b0a1 h1:lA+aPRvltlx2fwv/BnxyYS
 github.com/tj/front v0.0.0-20170212063142-739be213b0a1/go.mod h1:deJrtusCTptAW4EUn5vBLpl3dhNqPqUwEjWJz5UNxpQ=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/ini.v1 v1.39.0 h1:Jf2sFGT+sAd7i+4ftUN1Jz90uw8XNH8NXbbOY16taA8=
+gopkg.in/ini.v1 v1.39.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/yaml.v1 v1.0.0-20140924161607-9f9df34309c0 h1:POO/ycCATvegFmVuPpQzZFJ+pGZeX22Ufu6fibxDVjU=
 gopkg.in/yaml.v1 v1.0.0-20140924161607-9f9df34309c0/go.mod h1:WDnlLJ4WF5VGsH/HVa3CI79GS0ol3YnhVnKP89i0kNg=