Add an option to obtain properties from a user specified directory

core/src/main/java/pl/project13/core/GitDataProvider.java

@@ -60,6 +60,8 @@ public abstract class GitDataProvider implements GitProvider {
 
   protected boolean offline;
 
+  protected String projectDirectory;
+
   public GitDataProvider(@Nonnull LoggerBridge log) {
     this.log = log;
   }
@@ -114,6 +116,11 @@ public GitDataProvider setOffline(boolean offline) {
     return this;
   }
 
+  public GitDataProvider setProjectDirectory(String projectDirectory) {
+    this.projectDirectory = projectDirectory;
+    return this;
+  }
+
   public void loadGitData(@Nonnull String evaluateOnCommit, @Nonnull Properties properties) throws GitCommitIdExecutionException {
     this.evaluateOnCommit = evaluateOnCommit;
     init();

core/src/main/java/pl/project13/core/JGitProvider.java

@@ -82,31 +82,54 @@ public String getBuildAuthorEmail() throws GitCommitIdExecutionException {
   @Override
   public void prepareGitToExtractMoreDetailedRepoInformation() throws GitCommitIdExecutionException {
     try {
-      // more details parsed out bellow
-      Ref evaluateOnCommitReference = git.findRef(evaluateOnCommit);
-      ObjectId evaluateOnCommitResolvedObjectId = git.resolve(evaluateOnCommit);
-
-      if ((evaluateOnCommitReference == null) && (evaluateOnCommitResolvedObjectId == null)) {
-        throw new GitCommitIdExecutionException("Could not get " + evaluateOnCommit + " Ref, are you sure you have set the dotGitDirectory property of this plugin to a valid path?");
-      }
       revWalk = new RevWalk(git);
-      ObjectId headObjectId;
-      if (evaluateOnCommitReference != null) {
-        headObjectId = evaluateOnCommitReference.getObjectId();
+      if (projectDirectory != null) {
+        evalCommit = getCommitFromProjectDirectory(projectDirectory);
       } else {
-        headObjectId = evaluateOnCommitResolvedObjectId;
+        evalCommit = getCommitFromRef();
       }
-
-      if (headObjectId == null) {
-        throw new GitCommitIdExecutionException("Could not get " + evaluateOnCommit + " Ref, are you sure you have some commits in the dotGitDirectory?");
-      }
-      evalCommit = revWalk.parseCommit(headObjectId);
       revWalk.markStart(evalCommit);
     } catch (Exception e) {
       throw new GitCommitIdExecutionException("Error", e);
     }
   }
 
+  private RevCommit getCommitFromProjectDirectory(String projectDirectory) throws GitAPIException, GitCommitIdExecutionException {
+    //retrieve last commit in folder projectDirectory
+    Iterator<RevCommit> iterator = new Git(git).log().addPath(projectDirectory).call().iterator();
+    if (!iterator.hasNext()) {
+      throw new GitCommitIdExecutionException("Could not get commit from folder " + projectDirectory + " , are you sure you have some commits in the folder " + projectDirectory + "?");
+    }
+
+    RevCommit revCommit = iterator.next();
+    if (revCommit == null) {
+      throw new GitCommitIdExecutionException("Could not get commit from folder " + projectDirectory + " , are you sure you have some commits in the folder " + projectDirectory + "?");
+    }
+
+    return revCommit;
+  }
+
+  private RevCommit getCommitFromRef() throws IOException, GitCommitIdExecutionException {
+    // more details parsed out bellow
+    Ref evaluateOnCommitReference = git.findRef(evaluateOnCommit);
+    ObjectId evaluateOnCommitResolvedObjectId = git.resolve(evaluateOnCommit);
+
+    if ((evaluateOnCommitReference == null) && (evaluateOnCommitResolvedObjectId == null)) {
+      throw new GitCommitIdExecutionException("Could not get " + evaluateOnCommit + " Ref, are you sure you have set the dotGitDirectory property of this plugin to a valid path?");
+    }
+    ObjectId headObjectId;
+    if (evaluateOnCommitReference != null) {
+      headObjectId = evaluateOnCommitReference.getObjectId();
+    } else {
+      headObjectId = evaluateOnCommitResolvedObjectId;
+    }
+
+    if (headObjectId == null) {
+      throw new GitCommitIdExecutionException("Could not get " + evaluateOnCommit + " Ref, are you sure you have some commits in the dotGitDirectory?");
+    }
+    return revWalk.parseCommit(headObjectId);
+  }
+
   @Override
   public String getBranchName() throws GitCommitIdExecutionException {
     try {

maven/src/main/java/pl/project13/maven/git/GitCommitIdMojo.java

@@ -134,6 +134,14 @@ public class GitCommitIdMojo extends AbstractMojo {
   @Parameter(defaultValue = "${project.basedir}/.git")
   File dotGitDirectory;
 
+  /**
+   *  Get version number / build number based of the last git commit in the module itself,
+   *  and not based on the last git commit of the whole git project.
+   *  Works only in JGit mode.
+   */
+  @Parameter(defaultValue = "false")
+  boolean enablePerModuleVersions;
+
   /**
    * Configuration for the {@code 'git-describe'} command.
    * You can modify the dirty marker, abbrev length and other options here.
@@ -695,6 +703,11 @@ private void loadGitDataWithNativeGit(@Nonnull Properties properties) throws Git
   }
 
   private void loadGitDataWithJGit(@Nonnull Properties properties) throws GitCommitIdExecutionException {
+    String projectDirectory = null;
+    if (enablePerModuleVersions) {
+      String projectRootDir = dotGitDirectory.getAbsolutePath().substring(0, dotGitDirectory.getAbsolutePath().indexOf(".git"));
+      projectDirectory = project.getBasedir().getAbsolutePath().substring(projectRootDir.length()).replace("\\", "/");
+    }
     GitDataProvider jGitProvider = JGitProvider
         .on(dotGitDirectory, log)
         .setPrefixDot(prefixDot)
@@ -706,7 +719,8 @@ private void loadGitDataWithJGit(@Nonnull Properties properties) throws GitCommi
         .setUseBranchNameFromBuildEnvironment(useBranchNameFromBuildEnvironment)
         .setExcludeProperties(excludeProperties)
         .setIncludeOnlyProperties(includeOnlyProperties)
-        .setOffline(offline || settings.isOffline());
+        .setOffline(offline || settings.isOffline())
+        .setProjectDirectory(projectDirectory);
 
     jGitProvider.loadGitData(evaluateOnCommit, properties);
   }