Allow lambda sections to render text

README.md

@@ -351,6 +351,28 @@ Output:
 ```
 Hello, World!
 Hello, Felix!
+```  
+
+Functions can also render the text given to them if they need to do something more complicated.  
+
+Template:
+
+```mustache
+"{{#people}}Hi {{#upper}}{{name}}{{/upper}}{{/people}}"
+```
+
+Data:
+```clj
+{:people [{:name "Felix"}] 
+ :upper (fn [text] 
+          (fn [render-fn] 
+            (clojure.string/upper-case (render-fn text))))}
+```
+
+Output:  
+
+```
+Hello FELIX
 ```
 
 Development

src/clostache/parser.clj

@@ -341,7 +341,10 @@
         (:body section))
       (if section-data
         (if (fn? section-data)
-          (section-data (:body section))
+          (let [result (section-data (:body section))]
+            (if (fn? result) 
+              (result #(render-template % data partials))
+              result))
           (let [section-data (cond (sequential? section-data) section-data
                                    (map? section-data) [section-data]
                                    (seqable? section-data) (seq section-data)

test/clostache/test_parser.clj

@@ -113,7 +113,11 @@
 
 (deftest test-render-lambda-with-params
   (is (= "Hello, Felix" (render "{{#greet}}Felix{{/greet}}"
-                                {:greet #(str "Hello, " %)}))))
+                                {:greet #(str "Hello, " %)})))
+  (is (= "Hi TOM Hi BOB "
+         (render "{{#people}}Hi {{#upper}}{{name}}{{/upper}} {{/people}}"
+                 {:people [{:name "Tom"}, {:name "Bob"}] 
+                  :upper (fn [text] (fn [render-fn] (clojure.string/upper-case (render-fn text))))}))))
 
 (deftest test-render-resource-template
   (is (= "Hello, Felix" (render-resource "templates/hello.mustache" {:name "Felix"}))))