Merged in feature/log_two_revisions (pull request #104)

Feature log two revisions

scm-plugins/scm-git-plugin/src/main/java/sonia/scm/repository/spi/GitLogCommand.java

@@ -43,6 +43,7 @@ import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.revwalk.filter.RevFilter;
 import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
 import org.eclipse.jgit.treewalk.filter.PathFilter;
 import org.eclipse.jgit.treewalk.filter.TreeFilter;
@@ -198,6 +199,14 @@ public class GitLogCommand extends AbstractGitCommand implements LogCommand
           endId = repository.resolve(request.getEndChangeset());
         }
 
+        Ref branch = getBranchOrDefault(repository,request.getBranch());
+
+        ObjectId ancestorId = null;
+
+        if (!Strings.isNullOrEmpty(request.getAncestorChangeset())) {
+          ancestorId = computeCommonAncestor(request, repository, startId, branch);
+        }
+
         revWalk = new RevWalk(repository);
 
         converter = new GitChangesetConverter(repository, revWalk);
@@ -208,8 +217,6 @@ public class GitLogCommand extends AbstractGitCommand implements LogCommand
               PathFilter.create(request.getPath()), TreeFilter.ANY_DIFF));
         }
 
-        Ref branch = getBranchOrDefault(repository,request.getBranch());
-
         if (branch != null) {
           if (startId != null) {
             revWalk.markStart(revWalk.lookupCommit(startId));
@@ -217,11 +224,16 @@ public class GitLogCommand extends AbstractGitCommand implements LogCommand
             revWalk.markStart(revWalk.lookupCommit(branch.getObjectId()));
           }
 
+
           Iterator<RevCommit> iterator = revWalk.iterator();
 
           while (iterator.hasNext()) {
             RevCommit commit = iterator.next();
 
+            if (commit.getId().equals(ancestorId)) {
+              break;
+            }
+
             if ((counter >= start)
               && ((limit < 0) || (counter < start + limit))) {
               changesetList.add(converter.createChangeset(commit));
@@ -229,7 +241,7 @@ public class GitLogCommand extends AbstractGitCommand implements LogCommand
 
             counter++;
 
-            if ((endId != null) && commit.getId().equals(endId)) {
+            if (commit.getId().equals(endId)) {
               break;
             }
           }
@@ -263,4 +275,17 @@ public class GitLogCommand extends AbstractGitCommand implements LogCommand
 
     return changesets;
   }
+
+  private ObjectId computeCommonAncestor(LogCommandRequest request, Repository repository, ObjectId startId, Ref branch) throws IOException {
+    try (RevWalk mergeBaseWalk = new RevWalk(repository)) {
+      mergeBaseWalk.setRevFilter(RevFilter.MERGE_BASE);
+      if (startId != null) {
+        mergeBaseWalk.markStart(mergeBaseWalk.lookupCommit(startId));
+      } else {
+        mergeBaseWalk.markStart(mergeBaseWalk.lookupCommit(branch.getObjectId()));
+      }
+      mergeBaseWalk.markStart(mergeBaseWalk.parseCommit(repository.resolve(request.getAncestorChangeset())));
+      return mergeBaseWalk.next().getId();
+    }
+  }
 }

scm-plugins/scm-git-plugin/src/test/java/sonia/scm/repository/spi/GitLogCommandTest.java

@@ -64,7 +64,7 @@ public class GitLogCommandTest extends AbstractGitCommandTestBase
    * Tests log command with the usage of a default branch.
    */
   @Test
-  public void testGetDefaultBranch() throws Exception {
+  public void testGetDefaultBranch() {
     // without default branch, the repository head should be used
     ChangesetPagingResult result = createCommand().getChangesets(new LogCommandRequest());
 
@@ -92,7 +92,7 @@ public class GitLogCommandTest extends AbstractGitCommandTestBase
   }
 
   @Test
-  public void testGetAll() throws Exception
+  public void testGetAll()
   {
     ChangesetPagingResult result =
       createCommand().getChangesets(new LogCommandRequest());
@@ -103,7 +103,7 @@ public class GitLogCommandTest extends AbstractGitCommandTestBase
   }
 
   @Test
-  public void testGetAllByPath() throws Exception
+  public void testGetAllByPath()
   {
     LogCommandRequest request = new LogCommandRequest();
 
@@ -119,7 +119,7 @@ public class GitLogCommandTest extends AbstractGitCommandTestBase
   }
 
   @Test
-  public void testGetAllWithLimit() throws Exception
+  public void testGetAllWithLimit()
   {
     LogCommandRequest request = new LogCommandRequest();
 
@@ -143,7 +143,7 @@ public class GitLogCommandTest extends AbstractGitCommandTestBase
   }
 
   @Test
-  public void testGetAllWithPaging() throws Exception
+  public void testGetAllWithPaging()
   {
     LogCommandRequest request = new LogCommandRequest();
 
@@ -194,7 +194,7 @@ public class GitLogCommandTest extends AbstractGitCommandTestBase
   }
 
   @Test
-  public void testGetRange() throws Exception
+  public void testGetRange()
   {
     LogCommandRequest request = new LogCommandRequest();
 
@@ -216,6 +216,26 @@ public class GitLogCommandTest extends AbstractGitCommandTestBase
     assertEquals("435df2f061add3589cb326cc64be9b9c3897ceca", c2.getId());
   }
 
+  @Test
+  public void testGetAncestor()
+  {
+    LogCommandRequest request = new LogCommandRequest();
+
+    request.setBranch("test-branch");
+    request.setAncestorChangeset("master");
+
+    ChangesetPagingResult result = createCommand().getChangesets(request);
+
+    assertNotNull(result);
+    assertEquals(1, result.getTotal());
+    assertEquals(1, result.getChangesets().size());
+
+    Changeset c = result.getChangesets().get(0);
+
+    assertNotNull(c);
+    assertEquals("3f76a12f08a6ba0dc988c68b7f0b2cd190efc3c4", c.getId());
+  }
+
   @Test
   public void shouldFindDefaultBranchFromHEAD() throws Exception {
     setRepositoryHeadReference("ref: refs/heads/test-branch");