build.boot

(set-env!
  :resource-paths #{"src"}
  :dependencies   '[[tailrecursion/warp "0.1.0"]])

(require
  '[clojure.java.io :as io])

(deftask mytask
  "My demo task."
  []
  (let [tmpdir (temp-dir!)]
    (fn [next-task]
      (fn [fileset]
        (let [src-files (input-files fileset)
              to-delete (atom [])]
          (doseq [tf src-files]
            (let [path     (tmppath tf)
                  in-file  (tmpfile tf)
                  out-file (io/file tmpdir (str path ".uc"))]
              (when (.endsWith path ".lc")
                (swap! to-delete conj tf)
                (io/make-parents out-file)
                (spit out-file (.toUpperCase (slurp in-file))))))
          (-> fileset
              (rm! @to-delete)
              (add-resource! tmpdir)
              commit!
              next-task))))))

(deftask mytask2
  "My demo other task."
  []
  (let [server (delay :start-server-or-something)]
    (fn [next-task]
      (fn [fileset]
        @server
        (next-task fileset)))))

(deftask mytask3
  "My demo other task."
  []
  (comp (mytask) (mytask2)))