Move another System/exit out of run

src/core.clj

@@ -53,7 +53,9 @@
    :period "January 2024"
    :total-fees 66.67M})
 
-(defn run [options]
+(defn run
+  "Run the import with a map of options."
+  [options]
   (let [options (if (:demo options) (merge options demo-options) options)
         {:keys [date period pay-receipt-no pay-invoice-no total-fees project]} options
         {:keys [fees-receipt-no fees-invoice-no retirement-receipt-no retirement-invoice-no]} options
@@ -66,16 +68,15 @@
                          (import/fees date period fees-receipt-no fees-invoice-no total-fees project records)
                          (import/retirement date period retirement-receipt-no retirement-invoice-no records))
         unmatched (unmatched-employees records project)]
-    (when (seq unmatched)
-      (println
-       (str "Could not find these employees in the payroll:\n\n"
-            (str/join ", " unmatched)))
-      (System/exit 1))
-    (doseq [i imported]
-      (println (import/render-transaction i)))))
+    [imported unmatched]))
 
-(defn -main [& args]
-  (let [{:keys [options errors summary]} (parse-opts args cli-options)]
+(defn -main
+  "Run the CLI interface."
+  [& args]
+  (let [{:keys [options errors summary]} (parse-opts args cli-options)
+        errors (if-not (or (contains? options :csv) (contains? options :demo))
+                 (conj errors "Please provide a CSV file with \"--csv FILE\" or try \"--demo\"")
+                 errors)]
     (when (:help options)
       (println summary)
       (System/exit 0))
@@ -84,7 +85,14 @@
        (str "The following errors occurred:\n\n"
             (str/join \newline errors)))
       (System/exit 1))
-    (run options)))
+    (let [[imported unmatched] (run options)]
+      (when (seq unmatched)
+        (println
+         (str "Could not find these employees in the payroll:\n\n"
+              (str/join ", " unmatched)))
+        (System/exit 1))
+      (doseq [i imported]
+        (println (import/render-transaction i))))))
 
 (comment
   ;; Examples to exercise the importer during development.

test/core_test.clj

@@ -4,5 +4,5 @@
             [clojure.string :as str]))
 
 (deftest demo-produces-output
-  (let [output (with-out-str (core/run {:demo true}))]
-    (is (not (str/blank? output)))))
+  (let [[imported _] (core/run {:demo true})]
+    (is (pos? (count imported)))))