Get back multilevel ssi processing

Author: jknack

coverage-report/src/test/java/org/jooby/issues/Issue644.java

@@ -24,6 +24,14 @@ public void ssi() throws Exception {
             "</script>")
         .header("Content-Type", "text/html;charset=utf-8");
 
+    request()
+        .get("/i644/root.html")
+        .expect("<!-- The template for the note object -->\n" +
+            "<p>l1</p>\n" +
+            "<p>l2</p>\n" +
+            "")
+        .header("Content-Type", "text/html;charset=utf-8");
+
     request()
         .get("/644/index.html")
         .expect("<!-- The template for the note object -->\n" +

coverage-report/src/test/resources/i644/l1.html

@@ -0,0 +1,2 @@
+<p>l1</p>
+<!-- /i644/l2.html -->

coverage-report/src/test/resources/i644/l2.html

@@ -0,0 +1 @@
+<p>l2</p>

coverage-report/src/test/resources/i644/root.html

@@ -0,0 +1,2 @@
+<!-- The template for the note object -->
+<!-- /i644/l1.html -->

jooby/src/main/java/org/jooby/handlers/SSIHandler.java

@@ -136,16 +136,20 @@ public SSIHandler delimiters(final String start, final String end) {
   @Override
   protected void send(final Request req, final Response rsp, final Asset asset) throws Throwable {
     Env env = req.require(Env.class);
-    CharSequence text = env.resolver()
-        .delimiters(startDelimiter, endDelimiter)
-        .source(this::file)
-        .ignoreMissing()
-        .resolve(text(asset.stream()));
+    CharSequence text = process(env, text(asset.stream()));
 
     rsp.type(asset.type())
         .send(text);
   }
 
+  private String process(final Env env, final String src) {
+    return env.resolver()
+        .delimiters(startDelimiter, endDelimiter)
+        .source(key -> process(env, file(key)))
+        .ignoreMissing()
+        .resolve(src);
+  }
+
   private String file(final String key) {
     String file = Route.normalize(key.trim());
     return text(getClass().getResourceAsStream(file));