cleanup antlr generated files and make sure antlr always run (up-to-date) on build

Author: jknack

modules/jooby-apitool/.gitignore

@@ -1,2 +1,3 @@
 src/main/java/org/jooby/internal/apitool/javadoc/*.java
 *.tokens
+*.interp

modules/jooby-apitool/pom.xml

@@ -46,6 +46,27 @@
         </executions>
       </plugin>
 
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-antrun-plugin</artifactId>
+        <version>1.8</version>
+        <executions>
+          <execution>
+            <phase>process-sources</phase>
+            <configuration>
+              <target>
+                <delete>
+                  <fileset dir="${basedir}" includes="**/*.tokens"/>
+                </delete>
+              </target>
+            </configuration>
+            <goals>
+              <goal>run</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+
       <plugin>
         <groupId>org.antlr</groupId>
         <artifactId>antlr4-maven-plugin</artifactId>
@@ -57,6 +78,7 @@
         </configuration>
         <executions>
           <execution>
+            <phase>process-sources</phase>
             <goals>
               <goal>antlr4</goal>
             </goals>