CHANGES file from git tags is part of simulation distribution

ZmtDeployPlugin.groovy
    moved code for obtaining changes from git to CreateChanges
ZmtSimulationPlugin.groovy
    adds createChangesFile task and its output to the distribution
    updated test

src/main/groovy/de/zmt/gradle/ZmtDeployPlugin.groovy

@@ -11,7 +11,8 @@ import org.gradle.api.*
 public class ZmtDeployPlugin implements Plugin<Project> {
     private static final def CONFIGURE = {
         apply plugin: "org.hidetake.ssh"
-    
+        apply plugin: "distribution"
+        
         remotes {
             dochost {
                 host = determineCredentials.host
@@ -20,46 +21,28 @@ public class ZmtDeployPlugin implements Plugin<Project> {
                 password = credentials.dochostPw
             }
         }
-    
+        
         task('deployZip') {
             group = 'Upload'
             description = 'Uploads zip distribution to dochost.'
             dependsOn distZip, determineCredentials
-        }
-
-        deployZip.doLast {
-            println "\nConnecting to ${remotes.dochost.host}..."
-            ssh.run {
-                session(remotes.dochost) {
-                    def remoteTargetDir = determineCredentials.wwwPath + 'dist'
-                    
-                    // create target directory on remote
-                    execute "mkdir -p ${remoteTargetDir}"
-                    
-                    put from: distZip.archivePath, into: remoteTargetDir
-                    // create CHANGES file from git version list
-                    put text: obtainVersionListFromGit(project), into: remoteTargetDir + '/CHANGES'
+            
+            doLast {
+                println "\nConnecting to ${remotes.dochost.host}..."
+                ssh.run {
+                    session(remotes.dochost) {
+                        def remoteTargetDir = determineCredentials.wwwPath + 'dist'
+                        
+                        // create target directory on remote
+                        execute "mkdir -p ${remoteTargetDir}"
+                        
+                        put from: distZip.archivePath, into: remoteTargetDir
+                    }
                 }
             }
         }
     }
     
-    private static String obtainVersionListFromGit(Project project) {
-        def output = new ByteArrayOutputStream()
-        
-        try {
-            project.exec {
-                commandLine 'git', 'tag', '-n99'
-                standardOutput = output
-            }
-        }
-        catch (org.gradle.process.internal.ExecException e) {
-            println "git tag for ${project.name} failed. Cannot obtain version list."
-            return ''
-        }
-        return output.toString().trim()
-    }
-
     @Override
     void apply(Project project) {
         project.configure(project, CONFIGURE)

src/main/groovy/de/zmt/gradle/ZmtSimulationPlugin.groovy

 package de.zmt.gradle;
 
 import org.gradle.api.*
+import de.zmt.gradle.task.*;
 
 /*
  * Meta plugin applying all necessary plugins for ZMT simulations
@@ -16,6 +17,14 @@ public class ZmtSimulationPlugin implements Plugin<Project> {
         apply(plugin: ZmtEclipsePlugin)
         apply(plugin: ZmtLaunchConfigPlugin)
         apply(plugin: ZmtShortcutPlugin)
+        
+        task('createChangesFile', type: CreateChanges) {
+            description = 'Creates a CHANGES file from git tags.'
+        }
+        
+        distributions.main.contents {
+            from (project.createChangesFile)
+        }
     }
 
     @Override

src/main/groovy/de/zmt/gradle/task/CreateChanges.groovy

+package de.zmt.gradle.task;
+
+import org.gradle.api.*;
+import org.gradle.api.tasks.*;
+
+public class CreateChanges extends DefaultTask {
+    @OutputFile
+    File outputFile = project.file("$project.buildDir/tmp/CHANGES")
+    
+    @TaskAction
+    public void createChangesFile() {
+        try {
+            project.exec {
+                commandLine 'git', 'tag', '-n99'
+                standardOutput = new FileOutputStream(outputFile)
+            }
+        }
+        catch (org.gradle.process.internal.ExecException e) {
+            println "git tag for ${project.name} failed. Cannot obtain version list."
+        }
+    }
+}

src/test/groovy/de/zmt/gradle/ZmtSimulationPluginTest.groovy

@@ -3,6 +3,7 @@ package de.zmt.gradle
 import org.gradle.api.*
 import org.junit.*
 import org.gradle.testfixtures.ProjectBuilder
+import de.zmt.gradle.task.*;
 
 import static org.junit.Assert.*
 
@@ -22,6 +23,7 @@ class ZmtSimulationPluginTest {
             assertTrue(plugins.hasPlugin(ZmtEclipsePlugin.class))
             assertTrue(plugins.hasPlugin(ZmtLaunchConfigPlugin.class))
             assertTrue(plugins.hasPlugin(ZmtShortcutPlugin.class))
+            assertTrue(createChangesFile instanceof CreateChanges)
         }
         
         project.evaluate()