--- loncom/localize/lonlocal.pm	2008/09/20 01:57:50	1.48.2.1
+++ loncom/localize/lonlocal.pm	2009/09/14 22:32:09	1.50.4.1
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Localization routines
 #
-# $Id: lonlocal.pm,v 1.48.2.1 2008/09/20 01:57:50 raeburn Exp $
+# $Id: lonlocal.pm,v 1.50.4.1 2009/09/14 22:32:09 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -166,6 +166,7 @@ use locale;
 use POSIX qw(locale_h strftime);
 use DateTime();
 use DateTime::TimeZone;
+use DateTime::Locale;
 
 require Exporter;
 
@@ -232,6 +233,56 @@ sub current_language {
     return 'en';
 }
 
+sub preferred_languages {
+    my @languages=();
+    if (($Apache::lonnet::env{'request.role.adv'}) && ($Apache::lonnet::env{'form.languages'})) {
+        @languages=(@languages,split(/\s*(\,|\;|\:)\s*/,$Apache::lonnet::env{'form.languages'}));
+    }
+    if ($Apache::lonnet::env{'course.'.$Apache::lonnet::env{'request.course.id'}.'.languages'}) {
+        @languages=(@languages,split(/\s*(\,|\;|\:)\s*/,
+                 $Apache::lonnet::env{'course.'.$Apache::lonnet::env{'request.course.id'}.'.languages'}));
+    }
+
+    if ($Apache::lonnet::env{'environment.languages'}) {
+        @languages=(@languages,
+                    split(/\s*(\,|\;|\:)\s*/,$Apache::lonnet::env{'environment.languages'}));
+    }
+    my $browser=$ENV{'HTTP_ACCEPT_LANGUAGE'};
+    if ($browser) {
+        my @browser =
+            map { (split(/\s*;\s*/,$_))[0] } (split(/\s*,\s*/,$browser));
+        push(@languages,@browser);
+    }
+
+    foreach my $domtype ($Apache::lonnet::env{'user.domain'},$Apache::lonnet::env{'request.role.domain'},
+                         $Apache::lonnet::perlvar{'lonDefDomain'}) {
+        if ($domtype ne '') {
+            my %domdefs = &Apache::lonnet::get_domain_defaults($domtype);
+            if ($domdefs{'lang_def'} ne '') {
+                push(@languages,$domdefs{'lang_def'});
+            }
+        }
+    }
+    return &get_genlanguages(@languages);
+}
+
+sub get_genlanguages {
+    my (@languages) = @_;
+# turn "en-ca" into "en-ca,en"
+    my @genlanguages;
+    foreach my $lang (@languages) {
+        unless ($lang=~/\w/) { next; }
+        push(@genlanguages,$lang);
+        if ($lang=~/(\-|\_)/) {
+            push(@genlanguages,(split(/(\-|\_)/,$lang))[0]);
+        }
+    }
+    #uniqueify the languages list
+    my %count;
+    @genlanguages = map { $count{$_}++ == 0 ? $_ : () } @genlanguages;
+    return @genlanguages;
+}
+
 # ============================================================== What encoding?
 
 sub current_encoding {
@@ -278,7 +329,7 @@ sub get_language_handle {
 	my $headers=$r->headers_in;
 	$ENV{'HTTP_ACCEPT_LANGUAGE'}=$headers->{'Accept-language'};
     }
-    my @languages=&Apache::loncommon::preferred_languages;
+    my @languages=&preferred_languages();
     $ENV{'HTTP_ACCEPT_LANGUAGE'}='';
     $lh=Apache::localize->get_handle(@languages);
     if ($r) {
@@ -289,15 +340,24 @@ sub get_language_handle {
 
 # ========================================================== Localize localtime
 sub gettimezone {
-    my $timezone; 
-    if ($Apache::lonnet::env{'course.'.$Apache::lonnet::env{'request.course.id'}.'.timezone'}) {
-        $timezone = $Apache::lonnet::env{'course.'.$Apache::lonnet::env{'request.course.id'}.'.timezone'};    
-    } elsif ($Apache::lonnet::env{'request.course.id'} ne '') {
-        my $cdom = $Apache::lonnet::env{'course.'.$Apache::lonnet::env{'request.course.id'}.'.domain'};
-        if ($cdom ne '') {
-            my %domdefaults = &Apache::lonnet::get_domain_defaults($cdom);
-            if ($domdefaults{'timezone_def'} ne '') {
-                $timezone = $domdefaults{'timezone_def'};
+    my ($timezone) = @_;
+    if ($timezone ne '') {
+        if (!DateTime::TimeZone->is_valid_name($timezone)) {
+            $timezone = 'local';
+        }
+        return $timezone;
+    }
+    my $cid = $Apache::lonnet::env{'request.course.id'};
+    if ($cid ne '') {
+        if ($Apache::lonnet::env{'course.'.$cid.'.timezone'}) {
+            $timezone = $Apache::lonnet::env{'course.'.$cid.'.timezone'};
+        } else {
+            my $cdom = $Apache::lonnet::env{'course.'.$cid.'.domain'};
+            if ($cdom ne '') {
+                my %domdefaults = &Apache::lonnet::get_domain_defaults($cdom);
+                if ($domdefaults{'timezone_def'} ne '') {
+                    $timezone = $domdefaults{'timezone_def'};
+                }
             }
         }
     } elsif ($Apache::lonnet::env{'request.role.domain'} ne '') {
@@ -322,7 +382,7 @@ sub gettimezone {
 }
 
 sub locallocaltime {
-    my $thistime=shift;
+    my ($thistime,$timezone) = @_;
     if (!defined($thistime) || $thistime eq '') {
 	return &mt('Never');
     }
@@ -336,7 +396,7 @@ sub locallocaltime {
     }
 
     my $dt = DateTime->from_epoch(epoch => $thistime)
-                     ->set_time_zone(&gettimezone());
+                     ->set_time_zone(&gettimezone($timezone));
     if ((&current_language=~/^en/) || (!$lh)) {
 
 	return $dt->strftime("%a %b %e %I:%M:%S %P %Y (%Z)");
@@ -378,6 +438,38 @@ sub locallocaltime {
     }
 }
 
+sub getdatelocale {
+    my ($datelocale,$locale_obj);
+    if ($Apache::lonnet::env{'course.'.$Apache::lonnet::env{'request.course.id'}.'.datelocale'}) {
+        $datelocale = $Apache::lonnet::env{'course.'.$Apache::lonnet::env{'request.course.id'}.'.datelocale'};
+    } elsif ($Apache::lonnet::env{'request.course.id'} ne '') {
+        my $cdom = $Apache::lonnet::env{'course.'.$Apache::lonnet::env{'request.course.id'}.'.domain'};
+        if ($cdom ne '') {
+            my %domdefaults = &Apache::lonnet::get_domain_defaults($cdom);
+            if ($domdefaults{'datelocale_def'} ne '') {
+                $datelocale = $domdefaults{'datelocale_def'};
+            }
+        }
+    } elsif ($Apache::lonnet::env{'user.domain'} ne '') {
+        my %udomdefaults = &Apache::lonnet::get_domain_defaults($Apache::lonnet::env{'user.domain'});
+        if ($udomdefaults{'datelocale_def'} ne '') {
+            $datelocale = $udomdefaults{'datelocale_def'};
+        }
+    }
+    if ($datelocale ne '') {
+        eval {
+            $locale_obj = DateTime::Locale->load($datelocale);
+        };
+        if (!$@) {
+            if ($locale_obj->id() eq $datelocale) {
+                return $locale_obj;
+            }
+        }
+    }
+    return $locale_obj;
+}
+
+
 # ==================== Normalize string (reduce fragility in the lexicon files)
 
 # This normalizes a string to reduce fragility in the lexicon files of