Bug 421265: Let the user easily override the language used to display HTML pages

Bugzilla/Install/Util.pm

@@ -127,15 +127,28 @@ sub install_string {
 }
 
 sub include_languages {
+    # If we are in CGI mode (not in checksetup.pl) and if the function has
+    # been called without any parameter, then we cache the result of this
+    # function in Bugzilla->request_cache. This is done to improve the
+    # performance of the template processing.
+    my $to_be_cached = 0;
+    if (exists $ENV{'SERVER_SOFTWARE'} and not @_) {
+        my $cache = Bugzilla->request_cache;
+        if (exists $cache->{include_languages}) {
+            return @{$cache->{include_languages}}
+        }
+        $to_be_cached = 1;
+    }
     my ($params) = @_;
     $params ||= {};
 
     # Basically, the way this works is that we have a list of languages
     # that we *want*, and a list of languages that Bugzilla actually
     # supports. The caller tells us what languages they want, by setting
-    # $ENV{HTTP_ACCEPT_LANGUAGE} or $params->{only_language}. The languages
-    # we support are those specified in $params->{use_languages}. Otherwise
-    # we support every language installed in the template/ directory.
+    # $ENV{HTTP_ACCEPT_LANGUAGE}, using the "LANG" cookie or  setting
+    # $params->{only_language}. The languages we support are those
+    # specified in $params->{use_languages}. Otherwise we support every
+    # language installed in the template/ directory.
     
     my @wanted;
     if ($params->{only_language}) {
@@ -143,6 +156,15 @@ sub include_languages {
     }
     else {
         @wanted = _sort_accept_language($ENV{'HTTP_ACCEPT_LANGUAGE'} || '');
+        # Don't use the cookie if we are in "checksetup.pl". The test
+        # with $ENV{'SERVER_SOFTWARE'} is the same as in
+        # Bugzilla:Util::i_am_cgi.
+        if (exists $ENV{'SERVER_SOFTWARE'}) {
+            my $cgi = Bugzilla->cgi;
+            if (defined (my $lang = $cgi->cookie('LANG'))) {
+                unshift @wanted, $lang;
+            }
+        }
     }
     
     my @supported;
@@ -175,6 +197,13 @@ sub include_languages {
         push(@usedlanguages, 'en');
     }
 
+    # Cache the result if we are in CGI mode and called without parameter
+    # (see the comment at the top of this function).
+    if ($to_be_cached) {
+        my $cache = Bugzilla->request_cache;
+        $cache->{include_languages} = \@usedlanguages;
+    }
+
     return @usedlanguages;
 }
     

Bugzilla/Template.pm

@@ -729,6 +729,14 @@ sub create {
             # Currently logged in user, if any
             # If an sudo session is in progress, this is the user we're faking
             'user' => sub { return Bugzilla->user; },
+           
+            # Currenly active language
+            # XXX Eventually this should probably be replaced with something
+            # like Bugzilla->language.
+            'current_language' => sub {
+                my ($language) = include_languages();
+                return $language;
+            },
 
             # If an sudo session is in progress, this is the user who
             # started the session.

js/global.js

@@ -110,3 +110,12 @@ function check_mini_login_fields( suffix ) {
     window.alert( mini_login_constants.warning );
     return false;
 }
+
+function set_language( value ) {
+    YAHOO.util.Cookie.set('LANG', value,
+    {
+        expires: new Date('January 1, 2038'),
+        path: BUGZILLA.param.cookie_path
+    });
+    window.location.reload()
+}

skins/standard/global.css

@@ -61,6 +61,18 @@
         padding: 0.5em;
     }
 
+    #lang_links_container {
+        float: right;
+    }
+    #lang_links_container .links {
+        border: none;
+        padding: .5em;
+    }
+
+    .lang_current {
+        font-weight: bold;
+    }
+
     #message {
         border: 1px solid red;
         margin: 0.3em 0em;

template/en/default/bug/create/create.html.tmpl

@@ -33,7 +33,7 @@
   style_urls = [ 'skins/standard/create_attachment.css',
                  'skins/standard/yui/calendar.css' ]
   javascript_urls = [ "js/attachment.js", "js/util.js", "js/yui/calendar.js",
-                      "js/field.js", "js/yui/cookie.js", "js/TUI.js" ]
+                      "js/field.js", "js/TUI.js" ]
   onload = 'set_assign_to();'
 %]
 

template/en/default/global/header.html.tmpl

@@ -191,6 +191,7 @@
     <![endif]-->
 
     <script src="js/yui/yahoo-dom-event.js" type="text/javascript"></script>
+    <script src="js/yui/cookie.js" type="text/javascript"></script>
     <script src="js/global.js" type="text/javascript"></script>
     <script type="text/javascript">
     <!--
@@ -199,6 +200,18 @@
             YAHOO.util.Event._simpleRemove(window, "unload", 
                                            YAHOO.util.Event._unload);
         }
+        [%# The language selector needs javascript to set its cookie,
+          # so it is hidden in HTML/CSS by the "bz_default_hidden" class.
+          # If the browser can run javascript, it will then "unhide"
+          # the language selector using the following code.
+          #%]
+        function unhide_language_selector() { 
+            YAHOO.util.Dom.removeClass(
+                'lang_links_container', 'bz_default_hidden'
+            ); 
+        } 
+        YAHOO.util.Event.onDOMReady(unhide_language_selector);
+
         [%# Make some Bugzilla information available to all scripts. 
           # We don't import every parameter and constant because we
           # don't want to add a lot of uncached JS to every page. 
@@ -278,9 +291,26 @@
 </tr>
 </table>
 
-[% PROCESS "global/common-links.html.tmpl" qs_suffix = "_top" %]
+<table id="lang_links_container" cellpadding="0" cellspacing="0"
+       class="bz_default_hidden"><tr><td>
+[% IF Bugzilla.languages.size > 1 %]
+  <ul class="links">
+  [% FOREACH lang = Bugzilla.languages.sort %]
+    <li>[% IF NOT loop.first %]<span class="separator"> | </span>[% END %]
+    [% IF lang == current_language %]
+      <span class="lang_current">[% lang FILTER html FILTER upper %]</span>
+    [% ELSE %]
+      <a href="#" onclick="set_language('[% lang FILTER none %]');">
+       [%- lang FILTER html FILTER upper %]</a>
+    [% END %]
+    </li>
+  [% END %]
+  </ul>
+[% END %]
+</td></tr></table>
 
-</div>
+[% PROCESS "global/common-links.html.tmpl" qs_suffix = "_top" %]
+</div> [%# header %]
 
 <div id="bugzilla-body">