Now, if we have an empty repository, it will start from the default version 0.0.0 or from the configuration. [patch]

Author: Hugo Dias

src/main/java/pt/com/hugodias/gradle/gitversioner/core/version/Versioner.java

@@ -10,6 +10,7 @@
 import lombok.val;
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.errors.GitAPIException;
+import org.eclipse.jgit.revwalk.RevCommit;
 import pt.com.hugodias.gradle.gitversioner.core.exception.VersionerException;
 
 @Data
@@ -25,9 +26,12 @@ public Version version(VersionerConfig config) {
       var commit = 0;
 
       val branch = git.getRepository().getBranch();
-      val hash = git.getRepository().findRef("HEAD").getObjectId().getName();
-
-      val all = reverse(git.log().call());
+      String hash = "";
+      List<RevCommit> all = new LinkedList<>();
+      if (git.getRepository().findRef("HEAD").getObjectId() != null) {
+        hash = git.getRepository().findRef("HEAD").getObjectId().getName();
+        all = reverse(git.log().call());
+      }
 
       for (val it : all) {
         if (it.getFullMessage().contains(config.getMatchMajor())) {

src/test/java/pt/com/hugodias/gradle/gitversioner/core/VersionerTest.java

@@ -243,6 +243,28 @@ void testVersionIncludesCommitHashFromHead() throws GitAPIException, IOException
         .isEqualTo(git.getRepository().findRef("HEAD").getObjectId().getName());
   }
 
+  @Test
+  @DisplayName("Repository is empty")
+  void testWithAnEmptyRepository() {
+    VersionerConfig versionerConfig = VersionerConfig.builder().build();
+    Versioner versioner = Versioner.builder().gitFolder(projectDir).build();
+    Version version = versioner.version(versionerConfig);
+    assertThat(version.getMajor()).isEqualTo(0);
+    assertThat(version.getMinor()).isEqualTo(0);
+    assertThat(version.getPatch()).isEqualTo(0);
+  }
+
+  @Test
+  @DisplayName("Repository is empty and we have a patch custom configuration")
+  void testWithAnEmptyRepositoryWithCustomPatch() {
+    VersionerConfig versionerConfig = VersionerConfig.builder().startFromPatch(1).build();
+    Versioner versioner = Versioner.builder().gitFolder(projectDir).build();
+    Version version = versioner.version(versionerConfig);
+    assertThat(version.getMajor()).isEqualTo(0);
+    assertThat(version.getMinor()).isEqualTo(0);
+    assertThat(version.getPatch()).isEqualTo(1);
+  }
+
   private void givenRepositoryHasTypeCommitsNumbering(String message, int number)
       throws GitAPIException {
     createCommits(String.format("[%s]", message), number);