Do not version protobuf files + renamed packages (#170)

Author: devgianlu

README.md

@@ -54,6 +54,11 @@ This project uses [Maven](https://maven.apache.org/), after installing it you ca
 
 To run the newly build jar run `java -jar ./core/target/librespot-core-jar-with-dependencies.jar`.
 
+## Protobuf generation
+The compiled Java protobuf definitions aren't versioned, therefore, if you want to open the project inside you're IDE, you'll need to run `mvn compile` first to ensure that all the necessary files are created. 
+The `com.spotify` package is reserved for the generated files.
+
+
 ## Related Projects
 - [librespot](https://github.com/librespot-org/librespot)
 - [ansible-role-librespot](https://github.com/xMordax/ansible-role-librespot/tree/master) - Ansible role that will build, install and configure librespot-java.

common/.gitignore

@@ -0,0 +1 @@
+/src/**/java/com/spotify

common/pom.xml

@@ -26,4 +26,56 @@
             <version>${gson.version}</version>
         </dependency>
     </dependencies>
+
+    <build>
+        <extensions>
+            <extension>
+                <groupId>kr.motd.maven</groupId>
+                <artifactId>os-maven-plugin</artifactId>
+                <version>1.6.2</version>
+            </extension>
+        </extensions>
+        <plugins>
+            <plugin>
+                <artifactId>maven-clean-plugin</artifactId>
+                <version>3.0.0</version>
+                <executions>
+                    <execution>
+                        <id>clean-generate-proto</id>
+                        <phase>clean</phase>
+                        <goals>
+                            <goal>clean</goal>
+                        </goals>
+                        <configuration>
+                            <filesets>
+                                <fileset>
+                                    <directory>${basedir}/src/main/java/com/spotify</directory>
+                                    <includes>**</includes>
+                                </fileset>
+                            </filesets>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.xolstice.maven.plugins</groupId>
+                <artifactId>protobuf-maven-plugin</artifactId>
+                <version>0.6.1</version>
+                <configuration>
+                    <protocArtifact>com.google.protobuf:protoc:3.11.0:exe:${os.detected.classifier}</protocArtifact>
+                    <outputDirectory>${basedir}/src/main/java</outputDirectory>
+                    <clearOutputDirectory>false</clearOutputDirectory>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>compile</goal>
+                            <goal>test-compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
 </project>