Add a GitResetLast command

This way we can revert the last committed change.

android/app/src/main/java/io/gitjournal/gitjournal/GitResetLastTask.java

@@ -0,0 +1,54 @@
+package io.gitjournal.gitjournal;
+
+import android.os.AsyncTask;
+import android.util.Log;
+
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.api.ResetCommand;
+import org.eclipse.jgit.api.errors.GitAPIException;
+import org.eclipse.jgit.api.errors.TransportException;
+
+import java.io.File;
+
+import io.flutter.plugin.common.MethodChannel.Result;
+
+public class GitResetLastTask extends AsyncTask<String, Void, Void> {
+    private final static String TAG = "GitResetLastTask";
+    private Result result;
+
+    public GitResetLastTask(Result _result) {
+        result = _result;
+    }
+
+    protected Void doInBackground(String... params) {
+        final String cloneDirPath = params[0];
+
+        File cloneDir = new File(cloneDirPath);
+        Log.d("GitResetLastTask", "Clone Path: " + cloneDirPath);
+
+        try {
+            Git git = Git.open(cloneDir);
+
+            ResetCommand command = git.reset();
+            command.setMode(ResetCommand.ResetType.HARD);
+            command.setRef("HEAD^");
+            command.call();
+
+        } catch (TransportException e) {
+            Log.d(TAG, e.toString());
+            result.error("FAILED", e.getMessage(), null);
+            return null;
+        } catch (GitAPIException e) {
+            Log.d(TAG, e.toString());
+            result.error("FAILED", e.getMessage(), null);
+            return null;
+        } catch (Exception e) {
+            Log.d(TAG, e.toString());
+            result.error("FAILED", e.getMessage(), null);
+            return null;
+        }
+
+        result.success(null);
+        return null;
+    }
+}

android/app/src/main/java/io/gitjournal/gitjournal/MainActivity.java

@@ -171,6 +171,18 @@ public class MainActivity extends FlutterActivity implements MethodCallHandler {
 
             new GitInitTask(result).execute(initLocation);
             return;
+        } else if (call.method.equals("gitResetLast")) {
+            String folderName = call.argument("folderName");
+
+            if (folderName == null || folderName.isEmpty()) {
+                result.error("Invalid Parameters", "folderName Invalid", null);
+                return;
+            }
+
+            String cloneLocation = filesDir + "/" + folderName;
+
+            new GitResetLastTask(result).execute(cloneLocation);
+            return;
         } else if (call.method.equals("generateSSHKeys")) {
             String comment = call.argument("comment");
             if (comment == null || comment.isEmpty()) {

lib/apis/git.dart

@@ -150,6 +150,19 @@ Future gitPush(String folderName) async {
   }
 }
 
+Future gitResetLast(String folderName) async {
+  print("Going to git reset last");
+  try {
+    await _platform.invokeMethod('gitResetLast', {
+      'folderName': folderName,
+    });
+    print("Done");
+  } on PlatformException catch (e) {
+    print("gitResetLast Failed: '${e.message}'.");
+    throw createGitException(e.message);
+  }
+}
+
 Future gitCommit({
   @required String gitFolder,
   @required String authorName,

lib/gitapp.dart

@@ -88,6 +88,12 @@ class GitApp extends StatelessWidget {
           );
         },
       ),
+      RaisedButton(
+        child: Text("Git Reset Last"),
+        onPressed: () async {
+          gitResetLast(basePath);
+        },
+      ),
       RaisedButton(
         child: Text("Git Migrate"),
         onPressed: () async {