[core] add IDE agnostic configuration thus run spotlessApply on dev environment

Author: Vincent Potucek

.spotless/licence.header

@@ -0,0 +1,14 @@
+/*
+ * Copyright $YEAR Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+

eclipse_plugin/pom.xml

@@ -19,11 +19,14 @@
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
-  <groupId>com.google.googlejavaformat</groupId>
   <artifactId>google-java-format-eclipse-plugin</artifactId>
   <packaging>eclipse-plugin</packaging>
   <version>1.13.0</version>
-
+  <parent>
+    <groupId>com.google.googlejavaformat</groupId>
+    <artifactId>google-java-format-parent</artifactId>
+    <version>HEAD-SNAPSHOT</version>
+  </parent>
   <name>Google Java Format Plugin for Eclipse 4.5+</name>
 
   <description>

pom.xml

@@ -183,7 +183,56 @@
           <artifactId>maven-bundle-plugin</artifactId>
           <version>5.1.4</version>
         </plugin>
+        <plugin>
+          <groupId>com.diffplug.spotless</groupId>
+          <artifactId>spotless-maven-plugin</artifactId>
+          <version>2.44.5</version>
+          <configuration>
+            <formats>
+              <format>
+                <excludes>
+                  <exclude>**/testdata/**</exclude>
+                  <exclude>**gradlew**</exclude>
+                  <exclude>**mvnw**</exclude>
+                </excludes>
+                <includes>
+                  <include>.gitignore</include>
+                </includes>
+                <trimTrailingWhitespace/>
+              </format>
+            </formats>
+            <java>
+              <excludes>
+                <exclude>**/src/main/java/net/sourceforge/pmd/lang/java/types/package-info.java</exclude>
+                <exclude>**/testdata/**</exclude>
+                <exclude>**/unnecessaryimport/package1/U.java</exclude>
+              </excludes>
+              <googleJavaFormat/>
+              <removeUnusedImports/>
+              <licenseHeader>
+                <file>${maven.multiModuleProjectDirectory}/.spotless/licence.header</file>
+              </licenseHeader>
+            </java>
+          </configuration>
+          <executions>
+            <execution>
+              <id>spotless-apply</id>
+              <phase>process-sources</phase>
+              <goals>
+                <goal>apply</goal>
+              </goals>
+            </execution>
+            <execution>
+              <id>spotless-check</id>
+              <phase>verify</phase>
+              <goals>
+                <goal>check</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
       </plugins>
+
     </pluginManagement>
 
     <plugins>
@@ -295,6 +344,10 @@
           </argLine>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>com.diffplug.spotless</groupId>
+        <artifactId>spotless-maven-plugin</artifactId>
+      </plugin>
     </plugins>
   </build>