Saving Files in a Different Directory with Clojure

Saving (platform-independent) files to a different directory in the filesystem with Clojure turned out to be a bit more difficult to track down than I expected, though the solution is simple enough.

For a platform-independent approach, you can find the canonical path from a path relative to the project and then join it with the filename.

(:require [clojure.java.io :as io :refer [file]])

(defn file-dir 
  "Returns canonical path of a given path"
  [path] 
  (.getCanonicalPath (io/file path))) 

(-> "./resources" ;; relative
  (file-dir)
  (io/file "filename.txt")) ;;=> /path/to/project/resources/filename.txt