Add vaadin:upgrade8 which runs the migration tool (#90)

pom.xml

@@ -114,7 +114,7 @@
     <vaadinVersion>${vaadin.version}</vaadinVersion>
     <gwtVersion>${gwt.version}</gwtVersion>
     <mavenVersion>3.0.5</mavenVersion>
-    <mavenPluginPluginVersion>3.2</mavenPluginPluginVersion>
+    <mavenPluginPluginVersion>3.5</mavenPluginPluginVersion>
     <mojo.java.target>1.8</mojo.java.target>
     <doxia-sitetoolsVersion>1.6</doxia-sitetoolsVersion>
     <!--  to be able on powerfull ci machine to change it tru the cli :-) -->
@@ -150,19 +150,6 @@
         <enabled>true</enabled>
       </snapshots>
     </repository>
-    <!-- Codehaus closed its services in 2015 -->
-    <!--
-    <repository>
-      <id>codehaus-snapshots</id>
-      <url>http://nexus.codehaus.org/snapshots</url>
-      <snapshots>
-        <enabled>true</enabled>
-      </snapshots>
-      <releases>
-        <enabled>false</enabled>
-      </releases>
-    </repository>
-    -->
     <repository>
       <id>google-snapshots</id>
       <url>https://oss.sonatype.org/content/repositories/google-snapshots/</url>
@@ -410,6 +397,11 @@
       <artifactId>plexus-compiler-javac</artifactId>
       <version>2.3</version>
     </dependency>
+    <dependency>
+      <groupId>com.vaadin</groupId>
+      <artifactId>framework8-migration-tool</artifactId>
+      <version>8.0-SNAPSHOT</version>
+    </dependency>
   </dependencies>
   <profiles>
 

src/main/java/com/vaadin/integration/maven/Vaadin8UpgradeMojo.java

@@ -0,0 +1,60 @@
+package com.vaadin.integration.maven;
+
+import org.apache.maven.artifact.Artifact;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugin.MojoFailureException;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+import org.apache.maven.plugins.annotations.ResolutionScope;
+import org.codehaus.mojo.gwt.AbstractGwtMojo;
+
+import com.vaadin.framework8.migrate.Migrate;
+
+/**
+ * Updates Vaadin 7 class imports to their corresponding compatibility imports
+ * in a Vaadin 8 project. Additionally updates declarative files to use the correct
+ * versions of components.
+ */
+@Mojo(name = "upgrade8", requiresDependencyResolution = ResolutionScope.COMPILE)
+public class Vaadin8UpgradeMojo extends AbstractGwtMojo {
+    /**
+     * The vaadin version to use for upgrading.
+     */
+    @Parameter(property = "vaadin.version")
+    private String vaadinVersion;
+
+    @Override
+    public void execute() throws MojoExecutionException, MojoFailureException {
+        if (vaadinVersion == null) {
+            vaadinVersion = getVaadinVersion();
+        }
+        if (vaadinVersion == null) {
+            throw new MojoExecutionException(
+                    "Unable to determine the Vaadin version for the project. Use -Dvaadin.version=<version>");
+        }
+
+        if (!vaadinVersion.startsWith("8.")) {
+            throw new MojoExecutionException("Unexpected Vaadin version ("
+                    + vaadinVersion
+                    + "). Upgrade the project to Vaadin 8 or use -Dvaadin.version=<version> with a version starting with 8");
+        }
+        try {
+            Migrate.main(new String[] { "-version=" + vaadinVersion });
+        } catch (Exception e) {
+            throw new MojoFailureException("Problem migrating the project", e);
+        }
+    }
+
+    protected String getVaadinVersion() {
+        // find "vaadin-shared" and check its version
+        for (Artifact artifact : getProjectArtifacts()) {
+            if (VAADIN_GROUP_ID.equals(artifact.getGroupId())
+                    && "vaadin-shared".equals(artifact.getArtifactId())) {
+                return artifact.getVersion();
+            }
+        }
+
+        return null;
+    }
+
+}