feat(worktree): add ability to pass options to prune(...) API method (#71)

lib/src/bindings/worktree.dart

@@ -96,8 +96,16 @@ bool isPrunable(Pointer<git_worktree> wt) {
 /// Prune working tree.
 ///
 /// Prune the working tree, that is remove the git data structures on disk.
-void prune(Pointer<git_worktree> wt) {
-  libgit2.git_worktree_prune(wt, nullptr);
+void prune({required Pointer<git_worktree> worktreePointer, int? flags}) {
+  final opts = calloc<git_worktree_prune_options>();
+  libgit2.git_worktree_prune_options_init(
+    opts,
+    GIT_WORKTREE_PRUNE_OPTIONS_VERSION,
+  );
+
+  if (flags != null) opts.ref.flags = flags;
+
+  libgit2.git_worktree_prune(worktreePointer, opts);
 }
 
 /// List names of linked working trees.

lib/src/git_types.dart

@@ -1192,3 +1192,18 @@ enum GitIndexAddOption {
   const GitIndexAddOption(this.value);
   final int value;
 }
+
+/// Flags to alter working tree pruning behavior.
+enum GitWorktree {
+  /// Prune working tree even if working tree is valid.
+  pruneValid(1),
+
+  /// Prune working tree even if it is locked.
+  pruneLocked(2),
+
+  /// Prune checked out working tree.
+  pruneWorkingTree(4);
+
+  const GitWorktree(this.value);
+  final int value;
+}

lib/src/worktree.dart

@@ -77,10 +77,15 @@ class Worktree extends Equatable {
   /// Throws a [LibGit2Error] if error occured.
   bool get isPrunable => bindings.isPrunable(_worktreePointer);
 
-  /// Prunes working tree.
+  /// Prunes working tree, that is removes the git data structures on disk.
   ///
-  /// Prune the working tree, that is remove the git data structures on disk.
-  void prune() => bindings.prune(_worktreePointer);
+  /// [flags] is optional combination of [GitWorktree] flags.
+  void prune([Set<GitWorktree>? flags]) {
+    bindings.prune(
+      worktreePointer: _worktreePointer,
+      flags: flags?.fold(0, (acc, e) => acc! | e.value),
+    );
+  }
 
   /// Whether worktree is valid.
   ///