Getting Clojure

In the Wild

As you might expect, it’s easy to find very familiar-looking examples of if, when, cond, and case. Here, for instance, are a few lines pulled from Leiningen:

(when (real-directory? f)
  (doseq [child (.listFiles f)]
    (delete-file-recursively child silently)))

We may not follow the details, but the general idea of this code is not hard to work out: when f is a real directory—that is, not a file or a symbolic link—then delete it and all of its contents.

Here’s another snippet, also from Leiningen:

(if (.isDirectory entry)
  (.mkdirs f)
  (do (.mkdirs (.getParentFile f))
      (io/copy (.getInputStream jar entry) f)))

If entry is a directory, then do this; otherwise do something else.

Dot What?
	The reason for the funny un-Clojurelike ...