recognize @kinds with a dash

Author: erik-krogh

ql/ql/src/codeql_ql/ast/Ast.qll

@@ -186,7 +186,9 @@ class QueryDoc extends QLDoc {
   override string getAPrimaryQlClass() { result = "QueryDoc" }
 
   /** Gets the @kind for the query */
-  string getQueryKind() { result = this.getContents().regexpCapture("(?s).*@kind (\\w+)\\s.*", 1) }
+  string getQueryKind() {
+    result = this.getContents().regexpCapture("(?s).*@kind ([\\w-]+)\\s.*", 1)
+  }
 
   /** Gets the id part (without language) of the @id */
   string getQueryId() {
@@ -242,6 +244,12 @@ class Select extends TSelect, AstNode {
    */
   Expr getExpr(int i) { toQL(result) = sel.getChild(_).(QL::AsExprs).getChild(i) }
 
+  Expr getMessage() {
+    if this.getQueryDoc().getQueryKind() = "path-problem"
+    then result = this.getExpr(3)
+    else result = this.getExpr(1)
+  }
+
   // TODO: This gets the `i`th order-by, but some expressions might not have an order-by.
   Expr getOrderBy(int i) { toQL(result) = sel.getChild(_).(QL::OrderBys).getChild(i).getChild(0) }