Added exception throwing when rebase/merge failed due to uncommited changes

src/main/kotlin/app/exceptions/UncommitedChangesDetectedException.kt

@@ -0,0 +1,3 @@
+package app.exceptions
+
+class UncommitedChangesDetectedException(msg: String) : GitnuroException(msg)

src/main/kotlin/app/git/MergeManager.kt

@@ -1,9 +1,11 @@
 package app.git
 
+import app.exceptions.UncommitedChangesDetectedException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import org.eclipse.jgit.api.Git
 import org.eclipse.jgit.api.MergeCommand
+import org.eclipse.jgit.api.MergeResult
 import org.eclipse.jgit.api.ResetCommand
 import org.eclipse.jgit.lib.Ref
 import org.eclipse.jgit.revwalk.RevCommit
@@ -16,11 +18,15 @@ class MergeManager @Inject constructor() {
         else
             MergeCommand.FastForwardMode.NO_FF
 
-        git
+        val mergeResult = git
             .merge()
             .include(branch)
             .setFastForward(fastForwardMode)
             .call()
+
+        if(mergeResult.mergeStatus == MergeResult.MergeStatus.FAILED) {
+            throw UncommitedChangesDetectedException("Merge failed, makes sure you repository doesn't contain uncommited changes.")
+        }
     }
 
     suspend fun abortMerge(git: Git) = withContext(Dispatchers.IO) {

src/main/kotlin/app/git/RebaseManager.kt

@@ -1,19 +1,25 @@
 package app.git
 
+import app.exceptions.UncommitedChangesDetectedException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import org.eclipse.jgit.api.Git
 import org.eclipse.jgit.api.RebaseCommand
+import org.eclipse.jgit.api.RebaseResult
 import org.eclipse.jgit.lib.Ref
 import javax.inject.Inject
 
 class RebaseManager @Inject constructor() {
 
     suspend fun rebaseBranch(git: Git, ref: Ref) = withContext(Dispatchers.IO) {
-        git.rebase()
+        val rebaseResult = git.rebase()
             .setOperation(RebaseCommand.Operation.BEGIN)
             .setUpstream(ref.objectId)
             .call()
+
+        if(rebaseResult.status == RebaseResult.Status.UNCOMMITTED_CHANGES) {
+            throw UncommitedChangesDetectedException("Rebase failed, the repository contains uncommited changes.")
+        }
     }
 
     suspend fun continueRebase(git: Git) = withContext(Dispatchers.IO) {