add Maven plugin to return a YaCy style Git repository build release number and timestamp

- it injects properties which can be used in pom via ${DSTAMP} ${releaseNr} if added as plugin via
<plugin>
<groupId>net.yacy</groupId>
<artifactId>maven-plugin-gitrevisionnumber</artifactId>
<version>1.0</version>
<executions><execution>
<phase>initialize</phase>
<goals><goal>create</goal></goals>
</execution></executions>
</plugin>

libbuild/GitRevMavenTask/GitRevMavenTask.java

@@ -0,0 +1,119 @@
+
+import java.io.File;
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.List;
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugin.logging.Log;
+import org.apache.maven.plugins.annotations.Component;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+import org.apache.maven.project.MavenProject;
+
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevTag;
+import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.storage.file.FileRepositoryBuilder;
+
+/**
+ * Maven plugin to create property with YaCy release number,
+ * a 4 digit number based on commits to the Git repository
+ *
+ * @phase initialize
+ */
+@Mojo(name = "create")
+public class GitRevMavenTask extends AbstractMojo {
+
+    @Component
+    private MavenProject project;
+    /**
+     * Name of the buildNumber property
+     *
+     * parameter expression="${maven.buildNumber.buildNumberPropertyName}"
+     * default-value="releaseNr"
+     */
+    @Parameter
+    private String branchPropertyName = "branch";
+    @Parameter
+    private String buildNumberPropertyName = "releaseNr";
+    @Parameter
+    private String commitDatePropertyName = "DSTAMP";
+
+    Log log = this.getLog();
+
+    public void setBuildNumberPropertyName(String revprop) {
+        this.buildNumberPropertyName = revprop;
+    }
+
+    public void setCommitDatePropertyName(String dateprop) {
+        this.commitDatePropertyName = dateprop;
+    }
+
+    @Override
+    public void execute() throws MojoExecutionException {
+
+        String branch = null;
+        String revision = null;
+        String lastTag = null;
+        String commitDate = null;
+
+        try {
+
+            final File src = project.getBasedir(); // set Git root path to project root
+            final Repository repo = new FileRepositoryBuilder().readEnvironment()
+                    .findGitDir(src).build();
+            branch = repo.getBranch();
+            branch = "master".equals(branch) ? "" : "_" + branch;
+            final ObjectId head = repo.resolve("HEAD");
+		
+            final Git git = new Git(repo);
+
+            final List<RevTag> tags = git.tagList().call();
+
+            final RevWalk walk = new RevWalk(repo);
+            final RevCommit headCommit = walk.parseCommit(head);
+            final SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");
+            commitDate = df.format(headCommit.getAuthorIdent().getWhen());
+            walk.markStart(headCommit);
+            int distance = 0;
+            for (final RevCommit commit : walk) {
+                for (final RevTag tag : tags) {
+                    if (commit.equals(tag.getObject())) {
+                        lastTag = tag.getShortMessage();
+                        break;
+                    }
+                }
+                if (lastTag != null || distance++ > 999) {
+                    break;
+                }
+            }
+            walk.dispose();
+            if (lastTag == null) {
+                revision = "0000";
+            } else {
+                revision = Integer.toString(distance + 9000);
+            }
+        } catch (final IOException e) {
+            e.printStackTrace();
+        }
+        if (project != null) {
+            project.getProperties().put(this.branchPropertyName, branch);
+            log.info("GitrevMavenTask: set property " + this.branchPropertyName + "='" + branch + "'");            
+            project.getProperties().put(this.buildNumberPropertyName, revision);
+            log.info("GitrevMavenTask: set property " + this.buildNumberPropertyName + "=" + revision);
+            project.getProperties().put(this.commitDatePropertyName, commitDate);
+            log.info("GitrevMavenTask: set property " + this.commitDatePropertyName + "=" + commitDate);
+        } else {
+            log.error("GitrevMavenTask: no Maven project");
+            System.out.println(this.branchPropertyName + "=" + branch);
+            System.out.println(this.buildNumberPropertyName + "=" + revision);
+            System.out.println(this.commitDatePropertyName + "=" + commitDate);
+        }
+    }
+
+
+}

libbuild/pom.xml

@@ -3,11 +3,11 @@
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>net.yacy</groupId>
-    <artifactId>GitRevTask</artifactId>
-    <version>1.3</version>
-    <packaging>jar</packaging>
-    <description>YaCy - version tool</description>
-    <name>YaCy</name>
+    <artifactId>maven-plugin-gitrevisionnumber</artifactId>
+    <version>1.0</version>
+    <packaging>maven-plugin</packaging>
+    <name>YaCy - Build Properties Utility</name>
+    <description>This plugin gives you a Git repository release number. in the format 9000 as maven property "releaseNr" and a Git repository timestamp as Maven property "DSTAMP" in the format yyyymmdd </description>
     <url>http://www.yacy.net</url>
 
     <scm>
@@ -26,8 +26,7 @@
     </properties>
     
     <build>
-        <sourceDirectory>GitRevTask</sourceDirectory>
-
+        <sourceDirectory>GitRevMavenTask</sourceDirectory>
 
         <plugins>
                 
@@ -68,8 +67,6 @@
                 </configuration>
             </plugin>
 
-   
-
             <!-- exec:exec goal to provide start YaCy by Maven (just to have it for cases were the ide not provides a run command) -->
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
@@ -85,26 +82,60 @@
                     </arguments>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-plugin-plugin</artifactId>
+                <version>3.2</version>
+                <configuration>
+                    <!-- see http://jira.codehaus.org/browse/MNG-5346 -->
+                    <skipErrorNoDescriptorsFound>true</skipErrorNoDescriptorsFound>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>mojo-descriptor</id>
+                        <goals>
+                            <goal>descriptor</goal>
+                        </goals>
+                    </execution>
+                    <!-- if you want to generate help goal -->
+                    <!-- <execution> <id>help-goal</id> <goals> <goal>helpmojo</goal> </goals> </execution> -->
+                </executions>
+            </plugin>
         </plugins>
 
     </build>
 
     <dependencies>
         <dependency>
-            <groupId>log4j</groupId>
-            <artifactId>log4j</artifactId>
-            <version>1.2.16</version>
-            <type>jar</type>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.1.0</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.jgit</groupId>
             <artifactId>org.eclipse.jgit</artifactId>
-            <version>1.2.0.201112221803-r</version>
+            <version>1.3.0.201202151440-r</version>
+            <type>jar</type>
         </dependency>
         <dependency>
             <groupId>org.apache.ant</groupId>
             <artifactId>ant</artifactId>
-            <version>1.8.3</version>
+            <version>1.9.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>3.0-alpha-2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.plugin-tools</groupId>
+            <artifactId>maven-plugin-annotations</artifactId>
+            <version>3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.1.1</version>
         </dependency>
     </dependencies>
 </project>