Created retrolambda maven plugin. see issue #14

.gitignore

@@ -1,2 +1,5 @@
 /target/
 /*/target/
+.classpath
+.settings
+.project

README.md

@@ -66,16 +66,33 @@ Optional system properties:
       Output directory into where the generated class files are written.
       Defaults to same as retrolambda.inputDir
 ```
+### Maven plugin
+To run Retrolambda using Maven add the following to your pom.xml:
+```xml
+<build>
+  <plugins>
+    ...
+    <plugin>
+      <groupId>net.orfjackal.retrolambda</groupId>
+      <artifactId>retrolambda-maven-plugin</artifactId>
+      <version>0.1.15-SNAPSHOT</version>
+      <executions>
+        <execution>
+          <goals>
+            <goal>process-main</goal>
+            <goal>process-test</goal>
+          </goals>
+        </execution>
+      </executions>
+    </plugin>
+    ...
+```
+See [end-to-end-tests/pom.xml](https://github.com/orfjackal/retrolambda/blob/master/end-to-end-tests/pom.xml) for an example.
 
+Plugin documentation is [here](). (TODO decide where to put the site report)
 
 ### Tips
 
-For an example of how to run Retrolambda using Maven, see how
-maven-dependency-plugin and maven-antrun-plugin are used in
-[end-to-end-tests/pom.xml](https://github.com/orfjackal/retrolambda/blob/master/end-to-end-tests/pom.xml)
-There isn't yet a Maven plugin for doing that with less boilerplate, but maybe
-later.
-
 During development, inside an IDE, it's the easiest to use Java 8, without
 Retrolamba, to compile and run tests. But in your continuous integration build
 you should run tests using the target Java version. For example, you can

end-to-end-tests/pom.xml

@@ -47,7 +47,24 @@
             </plugin>
 
             <!-- Process our byte codes to make them run on Java 7 -->
+            <plugin>
+                <groupId>net.orfjackal.retrolambda</groupId>
+                <artifactId>retrolambda-maven-plugin</artifactId>
+                <version>${project.parent.version}</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>process-main</goal>
+                            <goal>process-test</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
 
+	<!-- alternatively, can use a call to the dependency plugin and antrun plugins for fine control of retrolambda parameters -->
+    <!-- although optimally all such use should be through the maven plugin above. Request changes if you need them! -->
+	<!-- if people are happy we could delete this block now -->
+	<!--
             <plugin>
                 <artifactId>maven-dependency-plugin</artifactId>
                 <executions>
@@ -118,7 +135,7 @@
                     </execution>
                 </executions>
             </plugin>
-
+-->
         </plugins>
     </build>
 

parent/pom.xml

@@ -283,12 +283,12 @@
 
                 <plugin>
                     <artifactId>maven-plugin-plugin</artifactId>
-                    <version>3.1</version>
+                    <version>3.2</version>
                 </plugin>
 
                 <plugin>
                     <artifactId>maven-site-plugin</artifactId>
-                    <version>3.1</version>
+                    <version>3.3</version>
                 </plugin>
 
                 <plugin>

pom.xml

@@ -18,6 +18,7 @@
     <modules>
         <module>parent</module>
         <module>retrolambda</module>
+		<module>retrolambda-maven-plugin</module>
         <module>end-to-end-tests</module>
     </modules>
 

retrolambda-maven-plugin/pom.xml

@@ -0,0 +1,153 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    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>
+    <parent>
+        <groupId>net.orfjackal.retrolambda</groupId>
+        <artifactId>parent</artifactId>
+        <version>1.1.5-SNAPSHOT</version>
+        <relativePath>../parent/pom.xml</relativePath>
+    </parent>
+    <artifactId>retrolambda-maven-plugin</artifactId>
+    <packaging>maven-plugin</packaging>
+
+    <name>${project.artifactId}</name>
+
+    <url>https://github.com/orfjackal/retrolambda</url>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <prerequisites>
+        <maven>${minimumMavenVersion}</maven>
+    </prerequisites>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>2.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.plugin-tools</groupId>
+            <artifactId>maven-plugin-annotations</artifactId>
+            <version>3.2</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.twdata.maven</groupId>
+            <artifactId>mojo-executor</artifactId>
+            <version>2.2.0</version>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <verbose>true</verbose>
+                    <fork>true</fork>
+                    <source>1.6</source>
+                    <target>1.6</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-plugin-plugin</artifactId>
+                <configuration>
+                    <goalPrefix>retrolambda</goalPrefix>
+                    <skipErrorNoDescriptorsFound>true</skipErrorNoDescriptorsFound>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>mojo-descriptor</id>
+                        <goals>
+                            <goal>descriptor</goal>
+                        </goals>
+                        <phase>process-classes</phase>
+                    </execution>
+                    <execution>
+                        <id>help-goal</id>
+                        <goals>
+                            <goal>helpmojo</goal>
+                        </goals>
+                        <phase>process-classes</phase>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-site-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>attach-descriptor</id>
+                        <goals>
+                            <goal>attach-descriptor</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <reportPlugins>
+                        <plugin>
+                            <groupId>org.apache.maven.plugins</groupId>
+                            <artifactId>maven-plugin-plugin</artifactId>
+                            <version>3.2</version>
+                        </plugin>
+                    </reportPlugins>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    <profiles>
+        <profile>
+            <id>run-its</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-invoker-plugin</artifactId>
+                        <version>1.7</version>
+                        <configuration>
+                            <debug>true</debug>
+                            <cloneProjectsTo>${project.build.directory}/it</cloneProjectsTo>
+                            <pomIncludes>
+                                <pomInclude>*/pom.xml</pomInclude>
+                            </pomIncludes>
+                            <postBuildHookScript>verify</postBuildHookScript>
+                            <localRepositoryPath>${project.build.directory}/local-repo</localRepositoryPath>
+                            <settingsFile>src/it/settings.xml</settingsFile>
+                            <goals>
+                                <goal>clean</goal>
+                                <goal>test-compile</goal>
+                            </goals>
+                        </configuration>
+                        <executions>
+                            <execution>
+                                <id>integration-test</id>
+                                <goals>
+                                    <goal>install</goal>
+                                    <goal>integration-test</goal>
+                                    <goal>verify</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+</project>

retrolambda-maven-plugin/src/it/settings.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you 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.
+-->
+
+<settings>
+  <profiles>
+    <profile>
+      <id>it-repo</id>
+      <activation>
+        <activeByDefault>true</activeByDefault>
+      </activation>
+      <repositories>
+        <repository>
+          <id>local.central</id>
+          <url>@localRepositoryUrl@</url>
+          <releases>
+            <enabled>true</enabled>
+          </releases>
+          <snapshots>
+            <enabled>true</enabled>
+          </snapshots>
+        </repository>
+      </repositories>
+      <pluginRepositories>
+        <pluginRepository>
+          <id>local.central</id>
+          <url>@localRepositoryUrl@</url>
+          <releases>
+            <enabled>true</enabled>
+          </releases>
+          <snapshots>
+            <enabled>true</enabled>
+          </snapshots>
+        </pluginRepository>
+      </pluginRepositories>
+    </profile>
+  </profiles>
+</settings>

retrolambda-maven-plugin/src/it/simple-it/pom.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  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>net.orfjackal.retrolambda.it</groupId>
+  <artifactId>simple-it</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <description>A simple IT verifying the basic use case.</description>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>@project.groupId@</groupId>
+        <artifactId>@project.artifactId@</artifactId>
+        <version>@project.version@</version>
+        <executions>
+          <execution>
+            <id>touch</id>
+            <phase>validate</phase>
+            <goals>
+              <goal>touch</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

retrolambda-maven-plugin/src/it/simple-it/verify.groovy

@@ -0,0 +1,3 @@
+File touchFile = new File( basedir, "target/touch.txt" );
+
+assert touchFile.isFile()

retrolambda-maven-plugin/src/main/java/net/orfjackal/retrolambda/maven/ClassesType.java

@@ -0,0 +1,5 @@
+package net.orfjackal.retrolambda.maven;
+
+enum ClassesType {
+    MAIN, TEST;
+}