--- loncom/interface/loncommon.pm	2007/09/10 23:03:38	1.581
+++ loncom/interface/loncommon.pm	2007/09/12 23:32:59	1.585
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # a pile of common routines
 #
-# $Id: loncommon.pm,v 1.581 2007/09/10 23:03:38 albertel Exp $
+# $Id: loncommon.pm,v 1.585 2007/09/12 23:32:59 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -2531,9 +2531,11 @@ sub preferred_languages {
 	@languages=(@languages,
 		    split(/\s*(\,|\;|\:)\s*/,$env{'environment.languages'}));
     }
-    my $browser=(split(/\;/,$ENV{'HTTP_ACCEPT_LANGUAGE'}))[0];
+    my $browser=$ENV{'HTTP_ACCEPT_LANGUAGE'};
     if ($browser) {
-	@languages=(@languages,split(/\s*(\,|\;|\:)\s*/,$browser));
+	my @browser = 
+	    map { (split(/\s*;\s*/,$_))[0] } (split(/\s*,\s*/,$browser));
+	push(@languages,@browser);
     }
     if (&Apache::lonnet::domain($env{'user.domain'},'lang_def')) {
 	@languages=(@languages,
@@ -2555,14 +2557,40 @@ sub preferred_languages {
     my @genlanguages;
     foreach my $lang (@languages) {
 	unless ($lang=~/\w/) { next; }
-	push (@genlanguages,$lang);
+	push(@genlanguages,$lang);
 	if ($lang=~/(\-|\_)/) {
 	    push(@genlanguages,(split(/(\-|\_)/,$lang))[0]);
 	}
     }
+    #uniqueify the languages list
+    my %count;
+    @genlanguages = map { $count{$_}++ == 0 ? $_ : () } @genlanguages;
     return @genlanguages;
 }
 
+sub languages {
+    my ($possible_langs) = @_;
+    my @preferred_langs = &preferred_languages();
+    if (!ref($possible_langs)) {
+	if( wantarray ) {
+	    return @preferred_langs;
+	} else {
+	    return $preferred_langs[0];
+	}
+    }
+    my %possibilities = map { $_ => 1 } (@$possible_langs);
+    my @preferred_possibilities;
+    foreach my $preferred_lang (@preferred_langs) {
+	if (exists($possibilities{$preferred_lang})) {
+	    push(@preferred_possibilities, $preferred_lang);
+	}
+    }
+    if( wantarray ) {
+	return @preferred_possibilities;
+    }
+    return $preferred_possibilities[0];
+}
+
 ###############################################################
 ##               Student Answer Attempts                     ##
 ###############################################################
@@ -4619,6 +4647,13 @@ table.LC_docs_adddocs th {
   background: #DDDDDD;
 }
 
+table.LC_sty_begin {
+  background: #BBFFBB;
+}
+table.LC_sty_end {
+  background: #FFBBBB;
+}
+
 END
 }
 
@@ -5873,6 +5908,59 @@ END_BLOCK
     return $output;
 }
 
+sub username_rule_check {
+    my ($srch,$caller) = @_;
+    my ($response,@curr_rules,%inst_results,$rulematch);
+    my ($rules,$ruleorder) = &Apache::lonnet::inst_userrules($srch->{'srchdomain'});
+    if (ref($srch) eq 'HASH') {
+        (my $inst_response,%inst_results) = 
+            &Apache::lonnet::get_instuser($srch->{'srchdomain'},
+                                          $srch->{'srchterm'});
+        my %domconfig = &Apache::lonnet::get_dom('configuration',
+                              ['usercreation'],$srch->{'srchdomain'});
+        if (ref($domconfig{'usercreation'}) eq 'HASH') {
+            if (ref($domconfig{'usercreation'}{'username_rule'}) eq 'ARRAY') {
+                @curr_rules = @{$domconfig{'usercreation'}{'username_rule'}};
+            }
+        }
+        if (@curr_rules > 0) {
+            my $domdesc = &Apache::lonnet::domain($srch->{'srchdomain'},'description');
+            my $instuser_reqd;
+            my %rule_check = &Apache::lonnet::inst_rulecheck($srch->{'srchdomain'},$srch->{'srchterm'},\@curr_rules);
+            foreach my $rule (@curr_rules) {
+                if ($rule_check{$rule}) {
+                    $rulematch = $rule;
+                    if ($inst_response eq 'ok') {
+                        if (keys(%inst_results) == 0) {
+                            if ($caller eq 'new') {
+                                $response = &mt('The username you chose matches the format of usernames defined for <span class="LC_cusr_emph">[_1]</span>, but the user does not exist in the institutional directory.',$domdesc).'<br />'.&mt("You must choose a username with a different format -- one that will not conflict with 'official' institutional usernames.");
+                            }
+                        }
+                    }
+                    last;
+                }
+            }
+            if ($response) {
+                if ((ref($rules) eq 'HASH') && (ref($ruleorder) eq 'ARRAY')) {
+                    if (@{$ruleorder} > 0) {
+                        $response .= '<br />'.&mt('Usernames with the following format(s) may <span class="LC_cusr_emph">only</span> be used for verified users at [_1]:',$domdesc).' <ul>';
+                        foreach my $rule (@{$ruleorder}) {
+                            if (grep(/^\Q$rule\E$/,@curr_rules)) {
+                                if (ref($rules->{$rule}) eq 'HASH') {
+                                    $response .= '<li>'.$rules->{$rule}{'name'}.': '.
+                                                 $rules->{$rule}{'desc'}.'</li>';
+                                }
+                            }
+                        }
+                    }
+                    $response .= '</ul>';
+                }
+            }
+        }
+    }
+    return ($response,$rulematch,$rules,%inst_results);
+}
+
 =pod
 
 =back