file-seq

(file-seq dir)

A lazy seq of the java.io.File dir and, when it is a directory, every File below it, depth first, each directory ahead of what it holds -- the oracle's tree-seq over isDirectory and listFiles. A directory's Files come in the order the host lists them, unsorted, like the oracle's; anything but a File is the oracle's ClassCastException. Runs on every backend; on wasm the tree needs a --dir preopen covering it. As a value a one-argument function. Files are clojure.java.io's.

clojure> (require '[clojure.java.io :as io])
nil
clojure> (sort (map str (file-seq (io/file "/tmp/notes"))))
("/tmp/notes" "/tmp/notes/a.txt" "/tmp/notes/b.txt")
clojure> (filter #(.isFile %) (file-seq (io/file "/tmp/notes")))
(#object[java.io.File "/tmp/notes/b.txt"] #object[java.io.File "/tmp/notes/a.txt"])