chmgen: Handle empty navigation groups and those with a bad first child

dlang · Feb 17, 2015 · 53bf707 · 53bf707
1 parent 3b39489
commit 53bf707
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/chmgen.d b/chmgen.d
@@ -41,8 +41,16 @@ Nav loadNav(string fileName, string base, bool warn)
         if (json.type == JSON_TYPE.ARRAY)
         {
             auto nodes = json.array;
-            auto root = parseNav(nodes[0]);
-            root.children = nodes[1..$].map!parseNav.array().filter!`a`.array();
+            auto parsedNodes = nodes.map!parseNav.array().filter!`a`.array();
+            if (!parsedNodes.length)
+            {
+                if (warn)
+                    stderr.writeln("Warning: Empty navigation group");
+                return null;
+            }
+
+            auto root = parsedNodes[0];
+            root.children = parsedNodes[1..$];
             return root;
         }
         else