--- loncom/localize/lonlocal.pm	2009/03/20 18:26:34	1.56
+++ loncom/localize/lonlocal.pm	2011/08/03 18:25:16	1.63
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Localization routines
 #
-# $Id: lonlocal.pm,v 1.56 2009/03/20 18:26:34 bisitz Exp $
+# $Id: lonlocal.pm,v 1.63 2011/08/03 18:25:16 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -173,16 +173,14 @@ require Exporter;
 our @ISA = qw (Exporter);
 our @EXPORT = qw(mt mtn ns mt_user);
 
+my %mtcache=();
+
 # ========================================================= The language handle
 
-use vars qw($lh);
+use vars qw($lh $current_language);
 
 # ===================================================== The "MakeText" function
 
-# ######### Localize Cache
-# my @localize_cache;
-# #########
-
 sub mt (@) {
 #    open(LOG,'>>/home/www/loncapa/loncom/localize/localize/newphrases.txt');
 #    print LOG (@_[0]."\n");
@@ -195,19 +193,13 @@ sub mt (@) {
                 return $_[0];
             }
         } else {
-            return $lh->maketext(@_);
-#				######### Localize Cache
-#				foreach my $e (@localize_cache)
-#				{
-#					if($_[0] eq $$e[0]) { return $$e[1]; }
-#				}
-#
-#				if($#localize_cache == 100) { pop(@localize_cache); }
-#				my $localize_entry = $lh->maketext(@_);
-#				unshift(@localize_cache, [ @_, $localize_entry ] );
-#				#########
-#            
-#	    		return $localize_entry;
+            if ($#_>0) { return $lh->maketext(@_); }
+            if ($mtcache{$current_language.':'.$_[0]}) {
+               return $mtcache{$current_language.':'.$_[0]};
+            }
+            my $translation=$lh->maketext(@_);
+            $mtcache{$current_language.':'.$_[0]}=$translation;
+            return $translation; 
         }
     } else {
 	if (wantarray) {
@@ -270,9 +262,9 @@ sub preferred_languages {
         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 $defdom = &Apache::lonnet::default_login_domain();
+    foreach my $domtype ($Apache::lonnet::env{'user.domain'},$Apache::lonnet::env{'request.role.domain'},$defdom) {
+        if (($domtype ne '') && ($domtype ne 'public')) {
             my %domdefs = &Apache::lonnet::get_domain_defaults($domtype);
             if ($domdefs{'lang_def'} ne '') {
                 push(@languages,$domdefs{'lang_def'});
@@ -303,13 +295,12 @@ sub get_genlanguages {
 
 sub current_encoding {
     my $default='UTF-8';
-# UTF-8 character encoding needed for the whole LON-CAPA system
-# (interface language and homework problem content)
-# See Bugzilla 5702 vs. 2189 and 4067
-#    if ($Apache::lonnet::env{'browser.os'} eq 'win' && 
-#	$Apache::lonnet::env{'browser.type'} eq 'explorer') {
-#        $default='ISO-8859-1';
-#    }
+    unless ($Apache::lonnet::env{'browser.unicode'}) {
+        if ($Apache::lonnet::env{'browser.os'} eq 'win' && 
+	    $Apache::lonnet::env{'browser.type'} eq 'explorer') {
+            $default='ISO-8859-1';
+        }
+    }
     if ($lh) {
 	my $enc=$lh->maketext('char_encoding');
 	return ($enc eq 'char_encoding'?$default:$enc);
@@ -343,14 +334,20 @@ sub texthash {
 # ========= Get a handle (do not invoke in vain, leave this to access handlers)
 
 sub get_language_handle {
-    my $r=shift;
+    my ($r,$chosen) = @_;
     if ($r) {
 	my $headers=$r->headers_in;
 	$ENV{'HTTP_ACCEPT_LANGUAGE'}=$headers->{'Accept-language'};
     }
-    my @languages=&preferred_languages();
+    my @languages;
+    if ($chosen ne '') {
+        @languages=($chosen);
+    } else {
+        @languages=&preferred_languages();
+    }
     $ENV{'HTTP_ACCEPT_LANGUAGE'}='';
     $lh=Apache::localize->get_handle(@languages);
+    $current_language=&current_language();
     if ($r) {
 	$r->content_languages([&current_language()]);
     }
@@ -385,7 +382,8 @@ sub gettimezone {
         if ($uroledomdefs{'timezone_def'} ne '') {
             $timezone = $uroledomdefs{'timezone_def'};
         }
-    } elsif ($Apache::lonnet::env{'user.domain'} ne '') {
+    } elsif (($Apache::lonnet::env{'user.domain'} ne '') && 
+             ($Apache::lonnet::env{'user.domain'} ne 'public')) {
         my %udomdefaults = 
             &Apache::lonnet::get_domain_defaults($Apache::lonnet::env{'user.domain'});
         if ($udomdefaults{'timezone_def'} ne '') {
@@ -402,6 +400,7 @@ sub gettimezone {
 
 sub locallocaltime {
     my ($thistime,$timezone) = @_;
+
     if (!defined($thistime) || $thistime eq '') {
 	return &mt('Never');
     }
@@ -415,7 +414,16 @@ sub locallocaltime {
     }
 
     my $dt = DateTime->from_epoch(epoch => $thistime)
-                     ->set_time_zone(&gettimezone($timezone));
+                     ->set_time_zone(gettimezone($timezone));
+
+    # TimeZone tries to determine the 'local' timezone from $ENV{TZ} if this
+    # fails it searches through various system files. Under certain
+    # circumstances this is an extremly expensive operation.
+    # So after the first run we store the timezone in $ENV{TZ} to significantly
+    # speed up future lookups. 
+    $ENV{TZ} = $dt->time_zone()->name() 
+        if (! $ENV{TZ} && gettimezone($timezone) eq 'local');
+
     if ((&current_language=~/^en/) || (!$lh)) {
 
 	return $dt->strftime("%a %b %e %I:%M:%S %P %Y (%Z)");
@@ -567,6 +575,44 @@ sub mt_escape {
     $$str_ref =~s/([\[\]])/~$1/g;
 }
 
+=pod
+
+=item * choose_language
+
+choose_language prompts a user to enter a two letter language code via
+keyboard when running a script from the command line. Default is en.
+
+=cut
+
+sub choose_language {
+    my %languages = (
+                      ar => 'Arabic',
+                      de => 'German',
+                      en => 'English',
+                      es => 'Spanish',
+                      fa => 'Persian',
+                      fr => 'French',
+                      he => 'Hebrew',
+                      ja => 'Japanese',
+                      pt => 'Portuguese',
+                      ru => 'Russian',
+                      tr => 'Turkish',
+                      zh => 'Chinese (Simplified)'
+                   );
+    my @posslangs = sort(keys(%languages));
+    my $langlist = join('|',@posslangs);
+    my $lang = 'en';
+    print 'Language: English (en). Change? ['.$langlist.']? ';
+    my $langchoice = <STDIN>;
+    chomp($langchoice);
+    $langchoice =~ s/(^\s+|\s+$)//g;
+    $langchoice = lc($langchoice);
+    if (defined($languages{$langchoice})) {
+        $lang = $langchoice;
+    }
+    return $lang;
+}
+
 1;
 
 __END__
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