walk through git tree

src/main.rs

@@ -1,3 +1,29 @@
-fn main() {
-    println!("Hello, world!");
+use clap::Parser;
+use git2::Repository;
+use std::path::PathBuf;
+
+#[derive(Debug, Parser)]
+struct Opt {
+    #[arg(required = true)]
+    repository: PathBuf,
+
+    #[arg(default_value = "HEAD")]
+    branch: String,
+}
+
+fn main() {
+    let opt = Opt::parse();
+
+    let repo = Repository::open(opt.repository).unwrap();
+    let commit = repo.revparse_single(&opt.branch).unwrap();
+    let id = commit.short_id().unwrap();
+    let id = id.as_str().unwrap();
+    let commit = commit.into_commit().unwrap();
+    let tree = commit.tree().unwrap();
+
+    tree.walk(git2::TreeWalkMode::PostOrder, move |dir, entry| {
+        dbg!(&id, dir, entry.name().unwrap());
+        0
+    })
+    .unwrap();
 }