Added generator for p2 repo build

build.gradle

@@ -2,27 +2,37 @@
  * Root project for xtext-core.
  */
 
+buildscript {
+	repositories.mavenLocal()
+	dependencies {
+		classpath 'io.typefox:p2-repo-gen:0.1.0'
+	}
+}
+
+apply from: "${rootDir}/gradle/versions.gradle"
+apply from: "${rootDir}/gradle/p2-deployment.gradle"
+
 ext.buildTime = new java.text.SimpleDateFormat('yyyyMMdd-HHmm').format(new Date())
 
 subprojects {
+	group = 'org.eclipse.xtext'
+	version = rootProject.version
+	
 	apply plugin: 'java'
 	apply plugin: 'eclipse'
 	apply plugin: 'maven'
 	
 	apply from: "${rootDir}/gradle/upstream-repositories.gradle"
-	apply from: "${rootDir}/gradle/versions.gradle"
 	apply from: "${rootDir}/gradle/java-compiler-settings.gradle"
 	apply from: "${rootDir}/gradle/maven-deployment.gradle"
 	apply from: "${rootDir}/gradle/eclipse-project-layout.gradle"
 	apply from: "${rootDir}/gradle/manifest-gen.gradle"
 	apply from: "${rootDir}/gradle/validation.gradle"
-	
-	group = 'org.eclipse.xtext'
 }
 
 task cleanLocalMavenRepo(type: Delete) {
-	group = 'Upload'
-	description = 'Delete the local Maven repository'
+	group 'Build'
+	description 'Deletes the local Maven repository'
 	delete 'build/maven-repository'
 }
 

gradle/maven-deployment.gradle

@@ -3,6 +3,8 @@
  */
 
 task sourcesJar(type: Jar, dependsOn: classes) {
+	group 'Build'
+	description 'Assembles a jar archive containing the sources.'
 	classifier = 'sources'
 	from sourceSets.main.allSource
 	from ('.') {
@@ -12,6 +14,8 @@ task sourcesJar(type: Jar, dependsOn: classes) {
 artifacts.archives sourcesJar
 
 task javadocJar(type: Jar, dependsOn: javadoc) {
+	group 'Build'
+	description 'Assembles a jar archive containing the JavaDoc output.'
 	classifier = 'javadoc'
 	from javadoc.destinationDir
 }

gradle/p2-deployment.gradle

@@ -0,0 +1,18 @@
+/*
+ * The p2gen plugin generates a Tycho build that assembles a p2 repository.
+ * The generator task should be rerun whenever necessary, e.g. when the version changes.
+ */
+
+apply plugin: 'io.typefox.p2gen'
+
+group = 'org.eclipse.xtext'
+
+p2gen {
+	targetRepository {
+		location "http://download.eclipse.org/modeling/tmf/xtext/updates/releases/${versions.xtext_bootstrap}/"
+		unit 'org.eclipse.xtext.sdk.feature.group'
+	}
+	targetRepository {
+		location 'http://download.eclipse.org/releases/luna/201502271000/'
+	}
+}