How to reload a clojure file in REPL

Question

What is the preferred way of reloading functions defined in a Clojure file without having to restart the REPL. Right now, in order to use the updated file I have to:

• edit src/foo/bar.clj
• close the REPL
• open the REPL
• (load-file "src/foo/bar.clj")
• (use 'foo.bar)

In addition, (use 'foo.bar :reload-all) does not result in required effect, which is evaluating the modified bodies of functions and returning new values, instead of behaving as the source haven't changed at all.

Answer 1

I use this in Lighttable (and the awesome instarepl) but it should be of use in other development tools. I was having the same problem with old definitions of functions and multimethods hanging around after reloads so now during development instead of declaring namespaces with:

(ns my.namespace)

I declare my namespaces like this:

(clojure.core/let [s 'my.namespace]
                  (clojure.core/remove-ns s)
                  (clojure.core/in-ns s)
                  (clojure.core/require '[clojure.core])
                  (clojure.core/refer 'clojure.core))

Pretty ugly but whenever I re-evaluate the entire namespace (Cmd-Shift-Enter in Lighttable to get the new instarepl results of each expression), it blows away all old definitions and gives me a clean environment. I was tripped up every few days by old definitions before I started doing this and it has saved my sanity. :)

Answer 2

One liner based on papachan's answer:

(clojure.tools.namespace.repl/refresh)