--- loncom/homework/inputtags.pm	2003/05/23 07:04:44	1.102
+++ loncom/homework/inputtags.pm	2003/06/07 03:57:28	1.104
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # input  definitons
 #
-# $Id: inputtags.pm,v 1.102 2003/05/23 07:04:44 albertel Exp $
+# $Id: inputtags.pm,v 1.104 2003/06/07 03:57:28 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -52,6 +52,8 @@ sub initialize_inputtags {
   @Apache::inputtags::previous_version=();
   # id of current part, 0 means that no part is current (inside <problem> only
   $Apache::inputtags::part='';
+  # list of all part ids seen
+  @Apache::inputtags::partlist=();
   # list of problem date statuses, the first element is for <problem>
   # if there is a second element it is for the current <part>
   @Apache::inputtags::status=();
@@ -59,6 +61,26 @@ sub initialize_inputtags {
   %Apache::inputtags::params=();
   # list of all ids, for <import>, these get join()ed and prepended
   @Apache::inputtags::import=();
+  # list of all import ids seen
+  @Apache::inputtags::importlist=();
+}
+
+sub check_for_duplicate_ids {
+    my %check;
+    foreach my $id (@Apache::inputtags::partlist,
+		    @Apache::inputtags::responselist,
+		    @Apache::inputtags::importlist) {
+	$check{$id}++;
+    }
+    my @duplicates;
+    foreach my $id (sort(keys(%check))) {
+	if ($check{$id} > 1) {
+	    push(@duplicates,$id);
+	}
+    }
+    if (@duplicates) {
+	&Apache::lonxml::error("Duplicated ids found, problem will operate incorrectly. Duplicated ids seen: ",join(', ',@duplicates));
+    }
 }
 
 sub start_input {
@@ -314,7 +336,7 @@ sub decideoutput {
 	  } else {
 	      $message = "<b>You are correct.</b>";
 	  }
-	  $message=' Your receipt is '.&Apache::lonnet::receipt;
+	  $message.=' Your receipt is '.&Apache::lonnet::receipt;
       }
       $button=0;
       $previousmsg='';
@@ -429,10 +451,9 @@ sub setgradedata {
 	    $Apache::lonhomework::history{"resource.$id.tries"} + 1;
 	$Apache::lonhomework::results{"resource.$id.solved"} =
 	    $solvemsg;
-	my $numawards=scalar(@Apache::inputtags::responselist);
-	&Apache::lonxml::debug("Whaaa!");
+	my $numawards=scalar(@Apache::inputtags::response);
 	$Apache::lonhomework::results{"resource.$id.awarded"} = 0;
-	foreach my $res (@Apache::inputtags::responselist) {
+	foreach my $res (@Apache::inputtags::response) {
 	    $Apache::lonhomework::results{"resource.$id.awarded"}+=
 	       $Apache::lonhomework::results{"resource.$id.$res.awarded"};
 	}
@@ -503,7 +524,7 @@ sub grade {
   my $response='';
   if ( defined $ENV{'form.submitted'}) {
     my @awards = ();
-    foreach $response (@Apache::inputtags::responselist) {
+    foreach $response (@Apache::inputtags::response) {
       &Apache::lonxml::debug("looking for response.$id.$response.awarddetail");
       my $value=$Apache::lonhomework::results{"resource.$id.$response.awarddetail"};
       &Apache::lonxml::debug("keeping $value from $response for $id");