Better, I think, but resources not found in test?

project.clj

@@ -6,4 +6,6 @@
   :dependencies [[org.clojure/clojure "1.7.0"]
                  [com.taoensso/timbre "4.10.0"]
                  [instaparse "1.4.7"]]
-  :plugins [[lein-codox "0.10.3"]])
+  :plugins [[lein-codox "0.10.3"]]
+  :profiles {:dev {:resource-paths ["resources"]}}
+  )

src/scot/weft/i18n/core.clj

@@ -2,6 +2,7 @@
       :author "Simon Brooke"}
   scot.weft.i18n.core
   (:require [clojure.java.io :as io]
+            [clojure.string :refer [join]]
             [instaparse.core :as insta]
             [taoensso.timbre :as timbre]))
 
@@ -96,30 +97,45 @@
         (parse-accept-language-header accept-language-header)))))
 
 
+(defn slurp-resource
+  "Slurp the resource of this name and return its contents as a string; but if it doesn't
+   exist log the fact and return nil, rather than throwing an exception."
+  [name]
+  (try
+    (slurp (io/resource name))
+    (catch Exception any
+      (timbre/error (str "Resource at " name " does not exist."))
+      nil)))
+
+
 (defn find-language-file-name
   "Find the name of a messages file on this resource path which matches this `language-spec`.
 
   * `language-spec` should be either a map as generated by `generate-accept-languages`, or
   else a string;
-  * `resource-path` should be the fully-qualified path name of the directory in which
-  message files are stored.
+  * `resource-path` should be the path name of the directory in which message files are stored,
+  within the resources on the classpath.
 
   Returns the name of an appropriate file if any is found, else nil."
   {:doc/format :markdown}
   [language-spec resource-path]
-  (cond
-    (and
-      (string? language-spec)
-      (.exists (io/file resource-path (str language-spec ".edn"))))
-    (.getAbsolutePath (io/file resource-path (str language-spec ".edn")))
-    (map? language-spec)
-    (or
-      (find-language-file-name
-        (str (:language language-spec) "-" (:qualifier language-spec))
-        resource-path)
-      (find-language-file-name
-        (:language language-spec)
-        resource-path))))
+  (let [file-path (if
+                    (string? language-spec)
+                    (join
+                      java.io.File/separator
+                      [resource-path (str language-spec ".edn")]))
+        contents (if file-path (slurp-resource file-path))]
+    (cond
+      contents
+      file-path
+      (map? language-spec)
+      (or
+        (find-language-file-name
+          (str (:language language-spec) "-" (:qualifier language-spec))
+          resource-path)
+        (find-language-file-name
+          (:language language-spec)
+          resource-path)))))
 
 
 (defn raw-get-messages
@@ -144,14 +160,12 @@
                         (acceptable-languages accept-language-header))))]
     (timbre/debug (str "Found i18n file at '" file-path "'"))
     (try
-      (read-string
-        (slurp
-          (or
-            file-path
-            (.getAbsolutePath
-              (io/file
-                resource-path
-                (str default-locale ".edn"))))))
+      (slurp-resource
+        (or
+          file-path
+          (join java.io.File/separator
+                [resource-path
+                 (str default-locale ".edn")])))
       (catch Exception any
         (timbre/error (str "Failed to load internationalisation because " (.getMessage any)))
         nil))))
@@ -168,7 +182,3 @@
 
   Returns a map of message keys to strings."
   (memoize raw-get-messages))
-
-
-
-