Issue researchgate#44 Release version and new version as build parame…

…ters

README.md

@@ -192,9 +192,10 @@ This means the gradle-release plugin does not support sub projects that have dif
 
 In a continuous integration environment like Jenkins or Hudson, you don't want to have an interactive release process. To avoid having to enter any information manually during the process, you can tell the plugin to automatically set and update the version number.
 
-You can do this by setting the 'gradle.release.useAutomaticVersion' property on the command line, or in Jenkins when you execute gradle.
+You can do this by setting the `gradle.release.useAutomaticVersion` property on the command line, or in Jenkins when you execute gradle. The version to release and the next version can be optionally defined using the properties `releaseVersion` and `nextVersion`. 
+
+    -Pgradle.release.useAutomaticVersion=true -PreleaseVersion=1.0.0 -PnewVersion=1.1.0-SNAPSHOT
 
-    -Pgradle.release.useAutomaticVersion=true
 
 ## Getting Help
 

src/main/groovy/release/ReleasePlugin.groovy

@@ -1,5 +1,7 @@
 package release
 
+import java.util.regex.Matcher
+
 import org.gradle.api.GradleException
 import org.gradle.api.Plugin
 import org.gradle.api.Project
@@ -8,15 +10,12 @@ import org.gradle.api.artifacts.Dependency
 import org.gradle.api.tasks.GradleBuild
 import org.gradle.api.tasks.TaskState
 
-import java.util.regex.Matcher
-
 /**
  * @author elberry
  * @author evgenyg
  * Created: Tue Aug 09 15:32:00 PDT 2011
  */
 class ReleasePlugin extends PluginHelper implements Plugin<Project> {
-
 	static final String RELEASE_GROUP = "Release"
 
 	@SuppressWarnings('StatelessClass')
@@ -94,15 +93,12 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
 		}
 	}
 
-
 	void initScmPlugin() {
         checkPropertiesFile()
 		scmPlugin.init()
 	}
 
-
 	void checkSnapshotDependencies() {
-
 		def matcher = { Dependency d -> d.version?.contains('SNAPSHOT') }
 		def collector = { Dependency d -> "${d.group ?: ''}:${d.name}:${d.version ?: ''}" }
 
@@ -134,13 +130,19 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
 	}
 
 	void confirmReleaseVersion() {
-		def version = "$project.version"
-		if (!useAutomaticVersion()) {
-			version = readLine("This release version:", version)
-		}
+		def version = getReleaseVersion();
 		updateVersionProperty(version)
 	}
 
+    String getReleaseVersion(String candidateVersion = "${project.version}") {
+        String releaseVersion = project.properties['releaseVersion'];
+
+        if (useAutomaticVersion()) {
+            return releaseVersion ?: candidateVersion;
+        }
+
+        return readLine("This release version:", releaseVersion ?: candidateVersion);
+    }
 
 	void unSnapshotVersion() {
 		def version = project.version.toString()
@@ -155,7 +157,6 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
 		}
 	}
 
-
 	void preTagCommit() {
 		if (project.properties['usesSnapshot'] || project.properties['versionModified']) {
 			// should only be committed if the project was using a snapshot version.
@@ -169,7 +170,6 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
 		}
 	}
 
-
 	void updateVersion() {
 		def version = project.version.toString()
 		Map<String, Closure> patterns = releaseConvention().versionPatterns
@@ -186,9 +186,9 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
 				if (project.properties['usesSnapshot']) {
 					nextVersion += '-SNAPSHOT'
 				}
-				if (!useAutomaticVersion()) {
-					nextVersion = readLine("Enter the next version (current one released as [$version]):", nextVersion)
-				}
+
+				nextVersion = getNextVersion(nextVersion);
+
 				project.ext.set("release.oldVersion", project.version)
 				project.ext.set("release.newVersion", nextVersion)
 				updateVersionProperty(nextVersion)
@@ -199,6 +199,15 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
 		throw new GradleException("Failed to increase version [$version] - unknown pattern")
 	}
 
+    String getNextVersion(String candidateVersion) {
+        String nextVersion = project.properties['newVersion'];
+
+        if (useAutomaticVersion()) {
+            return nextVersion ?: candidateVersion;
+        }
+
+        return readLine("Enter the next version (current one released as [${project.version}]):", nextVersion ?: candidateVersion);
+    }
 
 	def commitNewVersion() {
 		def message = releaseConvention().newVersionCommitMessage +
@@ -211,7 +220,6 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
 
 
 	def checkPropertiesFile() {
-
 		File propertiesFile = findPropertiesFile()
 
 		Properties properties = new Properties()
@@ -225,6 +233,7 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
         if ( !isVersionDefined() ) {
             project.version = properties.version
         }
+
 		try {
 			// test to make sure the version property is in the correct version=[version] format.
 			project.ant.replace(file: propertiesFile, token: "version=${project.version}", value: "version=${project.version}", failOnNoReplacements: true, preserveLastModified: true)