feat(remote): add bindings and api

lib/src/refspec.dart

@@ -0,0 +1,52 @@
+import 'dart:ffi';
+import 'package:libgit2dart/libgit2dart.dart';
+
+import 'bindings/libgit2_bindings.dart';
+import 'bindings/refspec.dart' as bindings;
+import 'git_types.dart';
+
+class Refspec {
+  /// Initializes a new instance of the [Refspec] class
+  /// from provided pointer to refspec object in memory.
+  Refspec(this._refspecPointer);
+
+  /// Pointer to memory address for allocated refspec object.
+  final Pointer<git_refspec> _refspecPointer;
+
+  /// Returns the source specifier.
+  String get source => bindings.source(_refspecPointer);
+
+  /// Returns the destination specifier.
+  String get destination => bindings.destination(_refspecPointer);
+
+  /// Returns the force update setting.
+  bool get force => bindings.force(_refspecPointer);
+
+  /// Returns the refspec's string.
+  String get string => bindings.string(_refspecPointer);
+
+  /// Returns the refspec's direction (fetch or push).
+  GitDirection get direction {
+    return bindings.direction(_refspecPointer) == 0
+        ? GitDirection.fetch
+        : GitDirection.push;
+  }
+
+  /// Checks if a refspec's source descriptor matches a reference.
+  bool matchesSource(String refname) =>
+      bindings.matchesSource(_refspecPointer, refname);
+
+  /// Checks if a refspec's destination descriptor matches a reference.
+  bool matchesDestination(String refname) =>
+      bindings.matchesDestination(_refspecPointer, refname);
+
+  /// Transforms a reference to its target following the refspec's rules.
+  ///
+  /// Throws a [LibGit2Error] if error occured.
+  String transform(String name) => bindings.transform(_refspecPointer, name);
+
+  /// Transforms a target reference to its source reference following the refspec's rules.
+  ///
+  /// Throws a [LibGit2Error] if error occured.
+  String rTransform(String name) => bindings.rTransform(_refspecPointer, name);
+}