Add the helpers for timestamp and brief contents.

src/main/blog/helpers.cljs

@@ -0,0 +1,23 @@
+(ns blog.helpers
+  (:require ["date-fns" :refer [format]]))
+
+(defn truncatestring-factory
+  []
+  (fn [text limit]
+    (-> (. text substring 0 limit)
+        (str  "..."))))
+
+(defn full-timestamp-factory
+  []
+  (clj->js
+   (fn [timestamp]
+     (format timestamp "HH:mm MMM. do, yyyy"))))
+
+(defn is-brief-factory
+  []
+  (clj->js
+   (fn [length]
+     (if (> length 60)
+       "..."
+       ""))))
+

src/main/blog/server.cljs

@@ -1,15 +1,33 @@
 (ns blog.server
   (:require ["express" :as express]
-            ["express-handlebars" :refer [engine]]
+            ["express-handlebars" :refer [engine create]]
             ["body-parser" :as body-parser]
             [blog.db :as db]
             [blog.env :as env]
-            [blog.handlers :as handlers]))
+            [blog.handlers :as handlers]
+            [blog.helpers :as helpers]))
 
 (def app (express))
 (def port (env/get-port))
 (def client (db/create-client))
 
+(defn register-helpers
+  "Register helpers to use them in the handlebars's templates."
+  []
+
+  (let [hbs (create (clj->js {}))]
+    (.registerHelper (.-handlebars hbs)
+                     "full-timestamp"
+                     (helpers/full-timestamp-factory))
+
+    (.registerHelper (.-handlebars hbs)
+                     "truncatestring"
+                     (helpers/truncatestring-factory))
+
+    (.registerHelper (.-handlebars hbs)
+                     "is-brief"
+                     (helpers/is-brief-factory))))
+
 (defn setup-engine
   "Sets the engine to handlebars and simple set up."
   []
@@ -18,13 +36,15 @@
   (. app
      engine ".hbs" (engine (-> {:extname ".hbs"
                                 :defaultLayout "main"}
-                               (cljs.core/clj->js))))
+                               (clj->js))))
 
   (. app
      set "view engine" ".hbs")
 
   (. app
-     set "views" "./views"))
+     set "views" "./views")
+
+  (register-helpers))
 
 (defn set-routes
   "Sets the routes for server."