Add features + ktlint as first feature

src/main/resources/starter/pom/@plugins.twig

@@ -10,5 +10,7 @@
 
         {% include "starter/pom/plugins/@shade" %}
 
+        {% include "starter/pom/plugins/@ktlint" %}
+
     </plugins>
-</build>
+</build>

src/main/resources/starter/pom/index.twig

@@ -8,6 +8,7 @@
     <properties>
         <java.version>{{ javaVersion }}</java.version>
         <kotlin.version>{{ kotlinVersion }}</kotlin.version>
+        <kotlin.code.style>official</kotlin.code.style>
         <maven.compiler.target>${java.version}</maven.compiler.target>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

src/main/resources/starter/pom/plugins/@ktlint.twig

@@ -0,0 +1,46 @@
+{% if features | hasFeature("ktlint") %}
+<plugin>
+    <groupId>org.apache.maven.plugins</groupId>
+    <artifactId>maven-antrun-plugin</artifactId>
+    <version>1.7</version>
+    <executions>
+        <execution>
+            <id>ktlint</id>
+            <phase>verify</phase>
+            <configuration>
+                <target name="ktlint">
+                    <java taskname="ktlint" dir="${basedir}" fork="true" failonerror="true"
+                          classname="com.pinterest.ktlint.Main" classpathref="maven.plugin.classpath">
+                        <arg value="src/**/*.kt"/>
+                    </java>
+                </target>
+            </configuration>
+            <goals>
+                <goal>run</goal>
+            </goals>
+        </execution>
+        <execution>
+            <id>ktlint-format</id>
+            <configuration>
+                <target name="ktlint">
+                    <java taskname="ktlint" dir="${basedir}" fork="true" failonerror="true"
+                          classname="com.pinterest.ktlint.Main" classpathref="maven.plugin.classpath">
+                        <arg value="-F"/>
+                        <arg value="src/**/*.kt"/>
+                    </java>
+                </target>
+            </configuration>
+            <goals>
+                <goal>run</goal>
+            </goals>
+        </execution>
+    </executions>
+    <dependencies>
+        <dependency>
+            <groupId>com.pinterest</groupId>
+            <artifactId>ktlint</artifactId>
+            <version>0.39.0</version>
+        </dependency>
+    </dependencies>
+</plugin>
+{% endif %}

src/main/resources/views/index.twig

@@ -10,6 +10,19 @@
         {% endfor %}
 
         <div class="mt-4">
+            <section>
+                <h2 class="category">Features</h2>
+                <ul>
+                    {% for feature in features %}
+                        <label class="m-2">
+                            <input name="{{ feature.name }}"
+                                   type="checkbox"{% if feature.value %} checked{% endif %}>
+                            <span>{{ feature.name }}</span>
+                        </label>
+                    {% endfor %}
+                </ul>
+            </section>
+
             {% for category in dependencies %}
                 <section>
                     <h2 class="category">{{ category.key }}</h2>