(binding [*compile-files* true]
  (require 'clojure.test))

(ns test-runner
  (:require [clojure.test :as t]))

(when-not (.exists (java.io.File. "classes"))
  (.. (java.io.File. "classes") mkdir))

(defmulti emacs-report :type)

(defmethod emacs-report :fail
  [m]
  (t/with-test-out
    (when-let [source-file (some-> t/*testing-vars*
                                   first
                                   meta
                                   :file)]
      (println (str "FAIL:" source-file ":" (:line m) ":" (t/testing-vars-str m) ":" (t/testing-contexts-str) ":" (:message m "FAIL")))
      (println (str "FAIL-CONTINUE:EXPECTED:" (pr-str (:expected m))))
      (println (str "FAIL-CONTINUE:ACTUAL:" (pr-str (:actual m)))))))

(defmethod emacs-report :error
  [m]
  (when-let [source-file (some-> t/*testing-vars*
                                 first
                                 meta
                                 :file)]
    (println (str "ERROR:" source-file ":" (:line m) ":" (t/testing-vars-str m) ":" (t/testing-contexts-str) ":" (:message m "FAIL")))
    (println (str "ERROR-CONTINUE:EXPECTED:" (pr-str (:expected m))))
    (println (str "ERROR-CONTINUE:ACTUAL:"
                  (if (instance? Throwable (:actual m))
                    (ex-message (:actual m))
                    (pr-str (:actual m)))))))

(defmethod emacs-report :default
  [_])

(defn -main  [& [test-file]]
  (binding  [*compile-files* true]
    (compile 'test-runner)
    (let  [test-namespaces (->> (or test-file  "test")
                                (java.io.File.)
                                (file-seq)
                                (filter (memfn isFile))
                                (map (memfn getPath))
                                (map load-file)
                                (map (comp :ns meta))
                                (into #{}))]
      (System/exit (if (pos? (reduce (fn [total-fails n]
                                       (with-redefs [t/report emacs-report]
                                         (let [results  (t/run-tests n)]
                                           (+ total-fails
                                              (:fail results 0)
                                              (:error results 0)))))
                                     0
                                     test-namespaces))
                     1
                     0)))))