Update -main in propeller.core to just print a message

src/propeller/core.cljc

@@ -1,34 +1,10 @@
 (ns propeller.core
-  #?(:clj (:gen-class))
-  (:require [propeller.gp :as gp]
-            #?(:cljs [cljs.reader :refer [read-string]])))
-
-(defn eval-problem-var
-  [problem-name var-name]
-  (eval (symbol (str "propeller.problems." problem-name "/" var-name))))
+  #?(:clj (:gen-class)))
 
 (defn -main
-  "Runs propel-gp, giving it a map of arguments."
+  "Not intended to be run; just print a message."
   [& args]
   ;; Exception for when no args were passed
-  (when (empty? args)
-    (println "You must specify a problem to run.")
-    (println "Try, for example:")
-    (println "   lein run software.smallest")
-    (System/exit 1))
-  (require (symbol (str "propeller.problems." (first args))))
-  (gp/gp
-    (merge
-      {:max-generations         500
-       :population-size         500
-       :max-initial-plushy-size 100
-       :step-limit              200
-       :parent-selection        :lexicase
-       :tournament-size         5
-       :umad-rate               0.1
-       :variation               {:umad 0.5 :crossover 0.5}
-       :elitism                 false}
-      (eval-problem-var (first args) "arglist")
-      (apply hash-map
-             (map #(if (and (string? %) (not (.contains % "/"))) (read-string %) %)
-                  (rest args))))))
+  (println "To run a genetic programming problem, provide a the problem's")
+  (println "namespace as specified in the Propeller README file at")
+  (println "https://github.com/lspector/propeller/blob/master/README.md"))