diff --git a/lib/src/bindings/index.dart b/lib/src/bindings/index.dart
index c2f5265..e1221c8 100644
--- a/lib/src/bindings/index.dart
+++ b/lib/src/bindings/index.dart
@@ -5,6 +5,32 @@ import 'package:libgit2dart/src/bindings/libgit2_bindings.dart';
 import 'package:libgit2dart/src/error.dart';
 import 'package:libgit2dart/src/util.dart';
 
+/// Read index capabilities flags.
+int capabilities(Pointer<git_index> index) => libgit2.git_index_caps(index);
+
+/// Set index capabilities flags.
+///
+/// If you pass [GitIndexCapability.fromOwner] for the caps, then capabilities
+/// will be read from the config of the owner object, looking at
+/// core.ignorecase, core.filemode, core.symlinks.
+///
+/// Throws a [LibGit2Error] if error occured.
+void setCapabilities({
+  required Pointer<git_index> indexPointer,
+  required int caps,
+}) {
+  final error = libgit2.git_index_set_caps(indexPointer, caps);
+
+  if (error < 0) {
+    throw LibGit2Error(libgit2.git_error_last());
+  }
+}
+
+/// Get the full path to the index file on disk.
+String path(Pointer<git_index> index) {
+  return libgit2.git_index_path(index).cast<Utf8>().toDartString();
+}
+
 /// Update the contents of an existing index object in memory by reading from
 /// the hard disk.
 ///
@@ -133,6 +159,10 @@ Pointer<git_index_entry> getByPath({
   }
 }
 
+/// Return the stage number from a git index entry.
+int entryStage(Pointer<git_index_entry> entry) =>
+    libgit2.git_index_entry_stage(entry);
+
 /// Clear the contents (all the entries) of an index object.
 ///
 /// This clears the index object in memory; changes must be explicitly written
@@ -194,6 +224,41 @@ void addByPath({
   }
 }
 
+/// Add or update an index entry from a buffer in memory.
+///
+/// This method will create a blob in the repository that owns the index and
+/// then add the index entry to the index. The path of the entry represents the
+/// position of the blob relative to the repository's root folder.
+///
+/// If a previous index entry exists that has the same path as the given
+/// 'entry', it will be replaced. Otherwise, the 'entry' will be added.
+///
+/// This forces the file to be added to the index, not looking at gitignore
+/// rules.
+///
+/// If this file currently is the result of a merge conflict, this file will no
+/// longer be marked as conflicting. The data about the conflict will be moved
+/// to the "resolve undo" (REUC) section.
+///
+/// Throws a [LibGit2Error] if error occured.
+void addFromBuffer({
+  required Pointer<git_index> indexPointer,
+  required Pointer<git_index_entry> entryPointer,
+  required String buffer,
+}) {
+  final bufferC = buffer.toNativeUtf8().cast<Int8>();
+  final error = libgit2.git_index_add_from_buffer(
+    indexPointer,
+    entryPointer,
+    bufferC.cast(),
+    buffer.length,
+  );
+
+  if (error < 0) {
+    throw LibGit2Error(libgit2.git_error_last());
+  }
+}
+
 /// Add or update index entries matching files in the working directory.
 ///
 /// This method will fail in bare index instances.
@@ -239,6 +304,50 @@ void addAll({
   }
 }
 
+/// Update all index entries to match the working directory.
+///
+/// This method will fail in bare index instances.
+///
+/// This scans the existing index entries and synchronizes them with the
+/// working directory, deleting them if the corresponding working directory
+/// file no longer exists otherwise updating the information (including adding
+/// the latest version of file to the ODB if needed).
+///
+/// Throws a [LibGit2Error] if error occured.
+void updateAll({
+  required Pointer<git_index> indexPointer,
+  required List<String> pathspec,
+}) {
+  final pathspecC = calloc<git_strarray>();
+  final pathPointers =
+      pathspec.map((e) => e.toNativeUtf8().cast<Int8>()).toList();
+  final strArray = calloc<Pointer<Int8>>(pathspec.length);
+
+  for (var i = 0; i < pathspec.length; i++) {
+    strArray[i] = pathPointers[i];
+  }
+
+  pathspecC.ref.strings = strArray;
+  pathspecC.ref.count = pathspec.length;
+
+  final error = libgit2.git_index_update_all(
+    indexPointer,
+    pathspecC,
+    nullptr,
+    nullptr,
+  );
+
+  calloc.free(pathspecC);
+  for (final p in pathPointers) {
+    calloc.free(p);
+  }
+  calloc.free(strArray);
+
+  if (error < 0) {
+    throw LibGit2Error(libgit2.git_error_last());
+  }
+}
+
 /// Write an existing index object from memory back to disk using an atomic
 /// file lock.
 void write(Pointer<git_index> index) => libgit2.git_index_write(index);
@@ -261,6 +370,17 @@ void remove({
   }
 }
 
+/// Remove all entries from the index under a given directory.
+void removeDirectory({
+  required Pointer<git_index> indexPointer,
+  required String dir,
+  required int stage,
+}) {
+  final dirC = dir.toNativeUtf8().cast<Int8>();
+  libgit2.git_index_remove_directory(indexPointer, dirC, stage);
+  calloc.free(dirC);
+}
+
 /// Remove all matching index entries.
 void removeAll({
   required Pointer<git_index> indexPointer,
@@ -332,6 +452,39 @@ List<Map<String, Pointer<git_index_entry>>> conflictList(
   return result;
 }
 
+/// Return whether the given index entry is a conflict (has a high stage entry).
+/// This is simply shorthand for [entryStage] > 0.
+bool entryIsConflict(Pointer<git_index_entry> entry) {
+  return libgit2.git_index_entry_is_conflict(entry) == 1 || false;
+}
+
+/// Add or update index entries to represent a conflict. Any staged entries
+/// that exist at the given paths will be removed.
+///
+/// The entries are the entries from the tree included in the merge. Any entry
+/// may be null to indicate that that file was not present in the trees during
+/// the merge. For example, [ancestorEntryPointer] may be null to indicate that
+/// a file was added in both branches and must be resolved.
+///
+/// Throws a [LibGit2Error] if error occured.
+void conflictAdd({
+  required Pointer<git_index> indexPointer,
+  Pointer<git_index_entry>? ancestorEntryPointer,
+  Pointer<git_index_entry>? ourEntryPointer,
+  Pointer<git_index_entry>? theirEntryPointer,
+}) {
+  final error = libgit2.git_index_conflict_add(
+    indexPointer,
+    ancestorEntryPointer ?? nullptr,
+    ourEntryPointer ?? nullptr,
+    theirEntryPointer ?? nullptr,
+  );
+
+  if (error < 0) {
+    throw LibGit2Error(libgit2.git_error_last());
+  }
+}
+
 /// Removes the index entries that represent a conflict of a single file.
 ///
 /// Throws a [LibGit2Error] if error occured.
@@ -349,6 +502,17 @@ void conflictRemove({
   }
 }
 
+/// Remove all conflicts in the index (entries with a stage greater than 0).
+///
+/// Throws a [LibGit2Error] if error occured.
+void conflictCleanup(Pointer<git_index> index) {
+  final error = libgit2.git_index_conflict_cleanup(index);
+
+  if (error < 0) {
+    throw LibGit2Error(libgit2.git_error_last());
+  }
+}
+
 /// Get the repository this index relates to.
 Pointer<git_repository> owner(Pointer<git_index> index) =>
     libgit2.git_index_owner(index);
diff --git a/lib/src/git_types.dart b/lib/src/git_types.dart
index b2041ca..8c6d185 100644
--- a/lib/src/git_types.dart
+++ b/lib/src/git_types.dart
@@ -1704,3 +1704,27 @@ class GitSubmoduleStatus {
   @override
   String toString() => 'GitSubmoduleStatus.$_name';
 }
+
+/// Capabilities of system that affect index actions.
+class GitIndexCapability {
+  const GitIndexCapability._(this._value, this._name);
+  final int _value;
+  final String _name;
+
+  static const ignoreCase = GitIndexCapability._(1, 'ignoreCase');
+  static const noFileMode = GitIndexCapability._(2, 'noFileMode');
+  static const noSymlinks = GitIndexCapability._(4, 'noSymlinks');
+  static const fromOwner = GitIndexCapability._(-1, 'fromOwner');
+
+  static const List<GitIndexCapability> values = [
+    ignoreCase,
+    noFileMode,
+    noSymlinks,
+    fromOwner,
+  ];
+
+  int get value => _value;
+
+  @override
+  String toString() => 'GitIndexCapability.$_name';
+}
diff --git a/lib/src/index.dart b/lib/src/index.dart
index 10da823..3aaeeab 100644
--- a/lib/src/index.dart
+++ b/lib/src/index.dart
@@ -19,6 +19,24 @@ class Index with IterableMixin<IndexEntry> {
   /// Pointer to memory address for allocated index object.
   Pointer<git_index> get pointer => _indexPointer;
 
+  /// Full path to the index file on disk.
+  String get path => bindings.path(_indexPointer);
+
+  /// Index capabilities flags.
+  Set<GitIndexCapability> get capabilities {
+    final capInt = bindings.capabilities(_indexPointer);
+    return GitIndexCapability.values
+        .where((e) => capInt & e.value == e.value)
+        .toSet();
+  }
+
+  set capabilities(Set<GitIndexCapability> flags) {
+    bindings.setCapabilities(
+      indexPointer: _indexPointer,
+      caps: flags.fold(0, (acc, e) => acc | e.value),
+    );
+  }
+
   /// Returns index entry located at provided 0-based position or string path.
   ///
   /// Throws [RangeError] when provided [value] is outside of valid range or
@@ -85,6 +103,39 @@ class Index with IterableMixin<IndexEntry> {
     return result;
   }
 
+  /// Adds or updates index entries to represent a conflict. Any staged entries
+  /// that exist at the given paths will be removed.
+  ///
+  /// The entries are the entries from the tree included in the merge. Any entry
+  /// may be null to indicate that that file was not present in the trees during
+  /// the merge. For example, [ancestorEntry] may be null to indicate
+  /// that a file was added in both branches and must be resolved.
+  ///
+  /// [ancestorEntry] is the entry data for the ancestor of the conflict.
+  ///
+  /// [ourEntry] is the entry data for our side of the merge conflict.
+  ///
+  /// [theirEntry] is the entry data for their side of the merge conflict.
+  ///
+  /// Throws a [LibGit2Error] if error occured.
+  void addConflict({
+    IndexEntry? ancestorEntry,
+    IndexEntry? ourEntry,
+    IndexEntry? theirEntry,
+  }) {
+    bindings.conflictAdd(
+      indexPointer: _indexPointer,
+      ancestorEntryPointer: ancestorEntry?.pointer,
+      ourEntryPointer: ourEntry?.pointer,
+      theirEntryPointer: theirEntry?.pointer,
+    );
+  }
+
+  /// Removes all conflicts in the index (entries with a stage greater than 0).
+  ///
+  /// Throws a [LibGit2Error] if error occured.
+  void cleanupConflict() => bindings.conflictCleanup(_indexPointer);
+
   /// Clears the contents (all the entries) of an index object.
   ///
   /// This clears the index object in memory; changes must be explicitly
@@ -116,6 +167,31 @@ class Index with IterableMixin<IndexEntry> {
     }
   }
 
+  /// Adds or updates an index [entry] from a [buffer] in memory.
+  ///
+  /// This method will create a blob in the repository that owns the index and
+  /// then add the index entry to the index. The path of the entry represents
+  /// the position of the blob relative to the repository's root folder.
+  ///
+  /// If a previous index entry exists that has the same path as the given
+  /// 'entry', it will be replaced. Otherwise, the 'entry' will be added.
+  ///
+  /// This forces the file to be added to the index, not looking at gitignore
+  /// rules.
+  ///
+  /// If this file currently is the result of a merge conflict, this file will
+  /// no longer be marked as conflicting. The data about the conflict will be
+  /// moved to the "resolve undo" (REUC) section.
+  ///
+  /// Throws a [LibGit2Error] if error occured.
+  void addFromBuffer({required IndexEntry entry, required String buffer}) {
+    bindings.addFromBuffer(
+      indexPointer: _indexPointer,
+      entryPointer: entry.pointer,
+      buffer: buffer,
+    );
+  }
+
   /// Adds or updates index entries matching files in the working directory.
   ///
   /// This method will fail in bare index instances.
@@ -130,6 +206,20 @@ class Index with IterableMixin<IndexEntry> {
     bindings.addAll(indexPointer: _indexPointer, pathspec: pathspec);
   }
 
+  /// Updates all index entries to match the working directory.
+  ///
+  /// This method will fail in bare index instances.
+  ///
+  /// This scans the existing index entries and synchronizes them with the
+  /// working directory, deleting them if the corresponding working directory
+  /// file no longer exists otherwise updating the information (including adding
+  /// the latest version of file to the ODB if needed).
+  ///
+  /// Throws a [LibGit2Error] if error occured.
+  void updateAll(List<String> pathspec) {
+    bindings.updateAll(indexPointer: _indexPointer, pathspec: pathspec);
+  }
+
   /// Updates the contents of an existing index object in memory by reading
   /// from the hard disk.
   ///
@@ -185,6 +275,16 @@ class Index with IterableMixin<IndexEntry> {
   void remove(String path, [int stage = 0]) =>
       bindings.remove(indexPointer: _indexPointer, path: path, stage: stage);
 
+  /// Removes all entries from the index under a given [directory] with
+  /// optional [stage].
+  void removeDirectory(String directory, [int stage = 0]) {
+    bindings.removeDirectory(
+      indexPointer: _indexPointer,
+      dir: directory,
+      stage: stage,
+    );
+  }
+
   /// Removes all matching index entries at provided list of [path]s relative
   /// to repository working directory.
   ///
@@ -286,9 +386,15 @@ class IndexEntry {
   /// Sets the UNIX file attributes of a index entry.
   set mode(GitFilemode mode) => _indexEntryPointer.ref.mode = mode.value;
 
+  /// Stage number.
+  int get stage => bindings.entryStage(_indexEntryPointer);
+
+  /// Whether the given index entry is a conflict (has a high stage entry).
+  bool get isConflict => bindings.entryIsConflict(_indexEntryPointer);
+
   @override
   String toString() {
-    return 'IndexEntry{oid: $oid, path: $path, mode: $mode}';
+    return 'IndexEntry{oid: $oid, path: $path, mode: $mode, stage: $stage}';
   }
 }
 
diff --git a/test/git_types_test.dart b/test/git_types_test.dart
index f818a88..7fc3961 100644
--- a/test/git_types_test.dart
+++ b/test/git_types_test.dart
@@ -561,5 +561,20 @@ void main() {
         );
       });
     });
+
+    group('GitIndexCapability', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 4, -1];
+        final actual = GitIndexCapability.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(
+          GitIndexCapability.ignoreCase.toString(),
+          'GitIndexCapability.ignoreCase',
+        );
+      });
+    });
   });
 }
diff --git a/test/index_test.dart b/test/index_test.dart
index 9c7777d..2d5ea50 100644
--- a/test/index_test.dart
+++ b/test/index_test.dart
@@ -27,6 +27,37 @@ void main() {
     const fileSha = 'e69de29bb2d1d6434b8b29ae775ad8c2e48c5391';
     const featureFileSha = '9c78c21d6680a7ffebc76f7ac68cacc11d8f48bc';
 
+    test('returns full path to the index file on disk', () {
+      expect(index.path, '${repo.path}index');
+    });
+
+    group('capabilities', () {
+      test('returns index capabilities', () {
+        expect(index.capabilities, isEmpty);
+      });
+
+      test('successfully sets index capabilities', () {
+        expect(index.capabilities, isEmpty);
+
+        index.capabilities = {
+          GitIndexCapability.ignoreCase,
+          GitIndexCapability.noSymlinks,
+        };
+
+        expect(index.capabilities, {
+          GitIndexCapability.ignoreCase,
+          GitIndexCapability.noSymlinks,
+        });
+      });
+
+      test('throws when trying to set index capabilities and error occurs', () {
+        expect(
+          () => Index(nullptr).capabilities = {},
+          throwsA(isA<LibGit2Error>()),
+        );
+      });
+    });
+
     test('returns number of entries', () {
       expect(index.length, 4);
     });
@@ -37,6 +68,10 @@ void main() {
       }
     });
 
+    test('returns stage of entry', () {
+      expect(index['file'].stage, 0);
+    });
+
     test('returns index entry at provided position', () {
       expect(index[3].path, 'file');
       expect(index[3].oid.sha, fileSha);
@@ -118,6 +153,26 @@ void main() {
       });
     });
 
+    group('addFromBuffer()', () {
+      test('successfully updates index entry from a buffer', () {
+        final entry = index['file'];
+        expect(repo.status, isEmpty);
+
+        index.addFromBuffer(entry: entry, buffer: 'updated');
+        expect(repo.status, {
+          'file': {GitStatus.indexModified, GitStatus.wtModified}
+        });
+      });
+
+      test('throws when trying to update entry and error occurs', () {
+        final nullEntry = IndexEntry(nullptr);
+        expect(
+          () => index.addFromBuffer(entry: nullEntry, buffer: ''),
+          throwsA(isA<LibGit2Error>()),
+        );
+      });
+    });
+
     group('addAll()', () {
       test('successfully adds with provided pathspec', () {
         index.clear();
@@ -152,6 +207,33 @@ void main() {
       });
     });
 
+    group('updateAll()', () {
+      test('successfully updates all entries to match working directory', () {
+        expect(repo.status, isEmpty);
+        File('${repo.workdir}file').deleteSync();
+        File('${repo.workdir}feature_file').deleteSync();
+
+        index.updateAll(['file', 'feature_file']);
+        expect(repo.status, {
+          'file': {GitStatus.indexDeleted},
+          'feature_file': {GitStatus.indexDeleted},
+        });
+      });
+
+      test('throws when trying to update all entries in bare repository', () {
+        final bare = Repository.open('test/assets/empty_bare.git');
+        final bareIndex = bare.index;
+
+        expect(
+          () => bareIndex.updateAll(['not_there']),
+          throwsA(isA<LibGit2Error>()),
+        );
+
+        bareIndex.free();
+        bare.free();
+      });
+    });
+
     test('writes to disk', () {
       expect(index.length, 4);
 
@@ -186,6 +268,17 @@ void main() {
       expect(index.find('feature_file'), false);
     });
 
+    test('removes all entries from a directory', () {
+      Directory('${repo.workdir}subdir/').createSync();
+      File('${repo.workdir}subdir/subfile').createSync();
+
+      index.add('subdir/subfile');
+      expect(index.length, 5);
+
+      index.removeDirectory('subdir');
+      expect(index.length, 4);
+    });
+
     test('successfully reads tree with provided SHA hex', () {
       final tree = repo.lookupTree(
         repo['df2b8fc99e1c1d4dbc0a854d9f72157f1d6ea078'],
@@ -228,6 +321,19 @@ void main() {
       tmpDir.deleteSync(recursive: true);
     });
 
+    test('successfully adds conflict entry', () {
+      expect(index.conflicts, isEmpty);
+      index.addConflict(
+        ourEntry: index['file'],
+        theirEntry: index['feature_file'],
+      );
+      expect(index.conflicts.length, 2);
+    });
+
+    test('throws when trying to add conflict entry and error occurs', () {
+      expect(() => Index(nullptr).addConflict(), throwsA(isA<LibGit2Error>()));
+    });
+
     test('returns conflicts with ancestor, our and their present', () {
       final repoDir = setupRepo(Directory('test/assets/mergerepo/'));
       final conflictRepo = Repository.open(repoDir.path);
@@ -322,7 +428,7 @@ void main() {
       repoDir.deleteSync(recursive: true);
     });
 
-    test('successfully removes conflicts', () {
+    test('successfully removes conflict', () {
       final repoDir = setupRepo(Directory('test/assets/mergerepo/'));
       final conflictRepo = Repository.open(repoDir.path);
 
@@ -331,6 +437,8 @@ void main() {
 
       conflictRepo.merge(conflictBranch.target);
       expect(index.hasConflicts, true);
+      expect(index['.gitignore'].isConflict, false);
+      expect(index.conflicts['conflict_file']!.our!.isConflict, true);
       expect(index.conflicts.length, 1);
 
       final conflictedFile = index.conflicts['conflict_file']!;
@@ -353,6 +461,34 @@ void main() {
       );
     });
 
+    test('successfully removes all conflicts', () {
+      final repoDir = setupRepo(Directory('test/assets/mergerepo/'));
+      final conflictRepo = Repository.open(repoDir.path);
+
+      final conflictBranch = conflictRepo.lookupBranch(name: 'conflict-branch');
+      final index = conflictRepo.index;
+
+      conflictRepo.merge(conflictBranch.target);
+      expect(index.hasConflicts, true);
+      expect(index.conflicts.length, 1);
+
+      index.cleanupConflict();
+      expect(index.hasConflicts, false);
+      expect(index.conflicts, isEmpty);
+
+      index.free();
+      conflictBranch.free();
+      conflictRepo.free();
+      repoDir.deleteSync(recursive: true);
+    });
+
+    test('throws when trying to remove all conflicts and error occurs', () {
+      expect(
+        () => Index(nullptr).cleanupConflict(),
+        throwsA(isA<LibGit2Error>()),
+      );
+    });
+
     test('returns string representation of Index and IndexEntry objects', () {
       final index = repo.index;