Add handlebars.java as template engine

jknack · jknack · commit cb59a8a292f0 · 2018-12-21T19:52:50.000-03:00
diff --git a/modules/jooby-bom/pom.xml b/modules/jooby-bom/pom.xml
@@ -15,6 +15,7 @@
   <properties>
     <!-- Parser and Renderer -->
     <freemarker.version>2.3.28</freemarker.version>
+    <handlebars.version>4.1.2</handlebars.version>
     <jackson.version>2.9.6</jackson.version>
 
     <!-- logging -->
@@ -170,6 +171,13 @@
         <version>${freemarker.version}</version>
       </dependency>
 
+      <!-- Handlebars -->
+      <dependency>
+        <groupId>com.github.jknack</groupId>
+        <artifactId>handlebars</artifactId>
+        <version>${handlebars.version}</version>
+      </dependency>
+
       <!-- Logging System -->
       <dependency>
         <groupId>org.slf4j</groupId>
diff --git a/modules/jooby-handlebars/pom.xml b/modules/jooby-handlebars/pom.xml
@@ -25,10 +25,10 @@
       <version>${jooby.version}</version>
     </dependency>
 
-    <!-- Freemarker -->
+    <!-- Handlebars -->
     <dependency>
-      <groupId>org.freemarker</groupId>
-      <artifactId>freemarker</artifactId>
+      <groupId>com.github.jknack</groupId>
+      <artifactId>handlebars</artifactId>
     </dependency>
 
     <!-- Test dependencies -->
diff --git a/modules/jooby-handlebars/src/main/java/io/jooby/handlebars/Hbs.java b/modules/jooby-handlebars/src/main/java/io/jooby/handlebars/Hbs.java
@@ -0,0 +1,39 @@
+package io.jooby.handlebars;
+
+import com.github.jknack.handlebars.Handlebars;
+import com.github.jknack.handlebars.Template;
+import com.github.jknack.handlebars.io.ClassPathTemplateLoader;
+import com.github.jknack.handlebars.io.TemplateLoader;
+import io.jooby.Context;
+import io.jooby.ModelAndView;
+import io.jooby.TemplateEngine;
+
+import java.nio.charset.StandardCharsets;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Hbs implements TemplateEngine {
+
+  private Handlebars handlebars;
+
+  public Hbs(Handlebars handlebars) {
+    this.handlebars = handlebars;
+  }
+
+  public Hbs() {
+    this(build(new ClassPathTemplateLoader("/views", "")));
+  }
+
+  public static Handlebars build(TemplateLoader loader) {
+    Handlebars handlebars = new Handlebars(loader);
+    handlebars.setCharset(StandardCharsets.UTF_8);
+    return handlebars;
+  }
+
+  @Override public String apply(Context ctx, ModelAndView modelAndView) throws Exception {
+    Template template = handlebars.compile(modelAndView.view);
+    Map<String, Object> model = new HashMap<>(ctx.locals());
+    model.putAll(modelAndView.model);
+    return template.apply(model);
+  }
+}
diff --git a/modules/jooby-handlebars/src/test/java/io/jooby/handlebars/HbsTest.java b/modules/jooby-handlebars/src/test/java/io/jooby/handlebars/HbsTest.java
@@ -0,0 +1,38 @@
+package io.jooby.handlebars;
+
+import io.jooby.MockContext;
+import io.jooby.ModelAndView;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class HbsTest {
+  public static class User {
+    private String firstname;
+
+    private String lastname;
+
+    public User(String firstname, String lastname) {
+      this.firstname = firstname;
+      this.lastname = lastname;
+    }
+
+    public String getFirstname() {
+      return firstname;
+    }
+
+    public String getLastname() {
+      return lastname;
+    }
+  }
+
+  @Test
+  public void render() throws Exception {
+    Hbs engine = new Hbs();
+    String output = engine
+        .apply(new MockContext().set("local", "var"), new ModelAndView("index.hbs")
+            .put("user", new User("foo", "bar"))
+            .put("sign", "!"));
+    assertEquals("Hello foo bar var!\n", output);
+  }
+}
diff --git a/modules/jooby-handlebars/src/test/resources/views/index.hbs b/modules/jooby-handlebars/src/test/resources/views/index.hbs
@@ -0,0 +1 @@
+Hello {{user.firstname}} {{user.lastname}} {{local}}{{sign}}
diff --git a/modules/pom.xml b/modules/pom.xml
@@ -17,6 +17,7 @@
     <module>server</module>
     <module>jooby-jackson</module>
     <module>jooby-freemarker</module>
+    <module>jooby-handlebars</module>
   </modules>
 
   <dependencyManagement>

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Hello {{user.firstname}} {{user.lastname}} {{local}}{{sign}}`