OK, this can now compile an index for a single file, and do it very quickly;

it cannot yet iterate over a directory, and I need to work out why not.

But progress!

project.clj

@@ -3,7 +3,8 @@
   :url "http://example.com/FIXME"
   :license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
             :url "https://www.eclipse.org/legal/epl-2.0/"}
-  :dependencies [[org.clojure/clojure "1.11.1"]
+  :dependencies [[dev.weavejester/medley "1.9.0"]
+                 [org.clojure/clojure "1.11.1"]
                  [peco "0.1.6"]]
   :repl-options {:init-ns cc.journeyman.elboob.core}
   :source-paths      ["src/clj"])