From 2dec48ad0bf76320d3aa28ce440bcfa1ac18a474 Mon Sep 17 00:00:00 2001
From: Jimmy GALLAND <jimmy.galland@celjim.fr>
Date: Mon, 23 Jan 2023 23:48:59 +0100
Subject: [PATCH] fix and improves compatibility detect language

---
 layouts/alias.html | 107 ++++++++++++++++++++++++++++-----------------
 1 file changed, 67 insertions(+), 40 deletions(-)

diff --git a/layouts/alias.html b/layouts/alias.html
index 7c5700b..2025bdc 100644
--- a/layouts/alias.html
+++ b/layouts/alias.html
@@ -12,54 +12,81 @@
     <script>
 
         document.addEventListener('DOMContentLoaded', function() {
-        const default_language = 'en'
-        var root_path =  (new URL('{{ site.BaseURL }}')).pathname;
-        // Only do i18n at root, 
-        // otherwise, redirect immediately
-        
-        if ( window.location.pathname !== root_path) {
-          window.location.replace('{{ .Permalink }}')
-          return
-        }
-        
+	  
+          var deleteFinalSlash = function(s){
+			      if ( s.substr(-1) == '/' ){
+			  	    return s.slice(0, -1)
+			      }else{
+				      return s
+			      }
+		      }
+	
+          const default_language = '{{ site.Language.Lang }}'
+		      const wlp = deleteFinalSlash(window.location.pathname)
+		      const root_path = deleteFinalSlash( (new URL('{{ site.BaseURL }}')).pathname )
 
-        var getFirstBrowserLanguage = function () {
-          var nav = window.navigator,
-          browserLanguagePropertyKeys = ['language', 'browserLanguage', 'systemLanguage', 'userLanguage'],
-          i,
-          language
+          // Only do i18n at root, 
+          // otherwise, redirect immediately
+          if ( wlp !== root_path) {
+            window.location.replace('{{ .Permalink }}')
+            return
+          }
 
-          if (Array.isArray(nav.languages)) {
-            for (i = 0; i < nav.languages.length; i++) {
-              language = nav.languages[i]
-              if (language && language.length) {
-                return language
+          var getFirstBrowserLanguage = function () {
+            var nav = window.navigator,
+            browserLanguagePropertyKeys = ['language', 'browserLanguage', 'systemLanguage', 'userLanguage'],
+            i,
+            language
+            
+            if (Array.isArray(nav.languages)) {
+              for (i = 0; i < nav.languages.length; i++) {
+                language = nav.languages[i]
+                if (language && language.length) {
+                  return language.replace('_', '-').toLowerCase()
+                }
               }
             }
-          }
-          // support for other well known properties in browsers
-          for (i = 0; i < browserLanguagePropertyKeys.length; i++) {
-            language = nav[browserLanguagePropertyKeys[i]]
-            if (language && language.length) {
-              return language
+            // support for other well known properties in browsers
+            for (i = 0; i < browserLanguagePropertyKeys.length; i++) {
+              language = nav[browserLanguagePropertyKeys[i]]
+              if (language && language.length) {
+                return language.replace('_', '-').toLowerCase()
+              }
             }
+            return default_language
           }
-          return default_language
-        }
 
-        const list_languages = ({{site.Languages}}).map(function(value,index) { return value['Lang']; })
-        const nav_lang = getFirstBrowserLanguage()
-        
-        if ( root_path.substr(-1) == '/' ) root_path = root_path.slice(0, -1)
+          var languages_available = [];          
+          ( {{ site.Languages }} ).forEach(
+                                            function(value,index) {
+                                              if ( value['Disabled'] == false ){
+                                                languages_available.push(value['Lang'])
+                                              }
+                                            }
+                                          )
+                                
+          const nav_lang = getFirstBrowserLanguage()
+          
+          var found_lang = default_language
 
-        if ( list_languages.indexOf( nav_lang ) !== -1 ){
-          window.location.replace(`${root_path}/${nav_lang}/`)
-        } else {
-          // fallback to English
-          window.location.replace(`${root_path}/${default_language}/`)
-        }
-      }
-      );
+          if ( languages_available.indexOf( nav_lang ) !== -1 ){
+
+            found_lang = nav_lang
+
+          }else if ( nav_lang.length > 2 ) {
+
+            const short_code_lang = nav_lang.slice(0,2)
+
+            if ( languages_available.indexOf( short_code_lang ) !== -1 ){
+              found_lang = short_code_lang
+            }
+            
+          }
+  
+          window.location.replace(`${root_path}/${found_lang}/`)
+
+          }
+      )
 
     </script>
 </head>