got rubric creation working

Management/Models/Local/LocalAssignment.cs

@@ -38,4 +38,41 @@ public record LocalAssignment
   public DateTime due_at { get; init; }
   public int points_possible { get; init; }
   public IEnumerable<SubmissionType> submission_types { get; init; } = new SubmissionType[] { };
+
+  public string GetRubricHtml()
+  {
+    var output = "<h1>Rubric</h1><pre><code class=\"language-json\">[\n";
+
+    var lineStrings = rubric.Select(
+      item => $"  {{\"label\": \"{item.Label}\", \"points\": {item.Points}}}"
+    );
+    output += string.Join(",\n", lineStrings);
+    output += "\n]</code></pre>";
+    return output;
+  }
+
+  public string GetDescriptionHtml(IEnumerable<AssignmentTemplate>? templates)
+  {
+    if (use_template && templates == null)
+      throw new Exception("cannot get description for assignment if templates not provided");
+
+    var rubricHtml = GetRubricHtml();
+
+    if (use_template)
+    {
+      var template = templates?.FirstOrDefault(t => t.Id == template_id);
+      if (template == null)
+        throw new Exception($"Could not find template with id {template_id}");
+
+      var html = Markdig.Markdown.ToHtml(template.Markdown);
+
+      foreach (KeyValuePair<string, string> entry in template_variables)
+      {
+        html = html.Replace($"%7B%7B{entry.Key}%7D%7D", entry.Value);
+      }
+      return html + "<hr>" + rubricHtml;
+    }
+
+    return Markdig.Markdown.ToHtml(description) + "<hr>" + rubricHtml;
+  }
 }