From 3096fcc2bed57bbcfdd3f488052e7ba70636f3ec Mon Sep 17 00:00:00 2001
From: Joscha <joscha@plugh.de>
Date: Mon, 23 Jan 2023 09:39:51 +0100
Subject: [PATCH] Traverse commits

---
 Cargo.lock  | 1325 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |    1 +
 src/main.rs |   62 ++-
 3 files changed, 1387 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 113e3dd..ea63105 100644
--- a/Cargo.lock
+++ b/Cargo.lock
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "time"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a561bf4617eebd33bca6434b988f39ed798e527f51a1e797d0ee4f61c0a38376"
+dependencies = [
+ "itoa",
+ "libc",
+ "num_threads",
+ "serde",
+ "time-core",
+ "time-macros",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e153e1f1acaef8acc537e68b44906d2db6436e2b35ac2c6b42640fff91f00fd"
+
+[[package]]
+name = "time-macros"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d967f99f534ca7e495c575c62638eebc2898a8c84c119b89e250477bc4ba16b2"
+dependencies = [
+ "time-core",
+]
+
+[[package]]
+name = "tinyvec"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
+
+[[package]]
+name = "uluru"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "794a32261a1f5eb6a4462c81b59cec87b5c27d5deea7dd1ac8fc781c41d226db"
+dependencies = [
+ "arrayvec",
+]
+
+[[package]]
+name = "unicode-bidi"
+version = "0.3.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d54675592c1dbefd78cbd98db9bacd89886e1ca50692a0692baefffdeb92dd58"
+
+[[package]]
+name = "unicode-bom"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63ec69f541d875b783ca40184d655f2927c95f0bffd486faa83cd3ac3529ec32"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "84a22b9f218b40614adcb3f4ff08b703773ad44fa9423e4e0d346d5db86e4ebc"
 
+[[package]]
+name = "unicode-normalization"
+version = "0.1.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
+dependencies = [
+ "tinyvec",
+]
+
+[[package]]
+name = "url"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "percent-encoding",
+]
+
 [[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
+[[package]]
+name = "walkdir"
+version = "2.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
+dependencies = [
+ "same-file",
+ "winapi",
+ "winapi-util",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -265,6 +1575,21 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows"
+version = "0.43.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04662ed0e3e5630dfa9b26e4cb823b817f1a9addda855d973a9458c236556244"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.42.0"
diff --git a/Cargo.toml b/Cargo.toml
index db15600..c4e72fd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,3 +5,4 @@ edition = "2021"
 
 [dependencies]
 clap = { version = "4.1.1", features = ["derive", "deprecated"] }
+git-repository = "0.33.0"
diff --git a/src/main.rs b/src/main.rs
index d5cf672..7605e33 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 use std::path::PathBuf;
 
 use clap::Parser;
+use git_repository::{traverse::tree::Recorder, Commit};
 
 #[derive(Debug, Parser)]
 struct Args {
@@ -9,7 +10,66 @@ struct Args {
     repo: PathBuf,
 }
 
+struct TreeVisitor;
+
+impl git_repository::traverse::tree::Visit for TreeVisitor {
+    fn pop_front_tracked_path_and_set_current(&mut self) {
+        println!("pop_front_tracked_path_and_set_current");
+    }
+
+    fn push_back_tracked_path_component(&mut self, component: &git_repository::bstr::BStr) {
+        println!("push_back_tracked_path_component {component:?}");
+    }
+
+    fn push_path_component(&mut self, component: &git_repository::bstr::BStr) {
+        println!("push_path_component {component:?}");
+    }
+
+    fn pop_path_component(&mut self) {
+        println!("pop_path_component");
+    }
+
+    fn visit_tree(
+        &mut self,
+        entry: &git_repository::objs::tree::EntryRef<'_>,
+    ) -> git_repository::traverse::tree::visit::Action {
+        println!("visit_tree {entry:?}");
+        git_repository::traverse::tree::visit::Action::Continue
+    }
+
+    fn visit_nontree(
+        &mut self,
+        entry: &git_repository::objs::tree::EntryRef<'_>,
+    ) -> git_repository::traverse::tree::visit::Action {
+        println!("visit_nontree {entry:?}");
+        git_repository::traverse::tree::visit::Action::Continue
+    }
+}
+
+fn print_commit(commit: &Commit) {
+    println!("{commit:?}");
+    println!("{:?}", commit.message().unwrap());
+    let mut recorder = Recorder::default();
+    commit
+        .tree()
+        .unwrap()
+        .traverse()
+        .breadthfirst(&mut recorder)
+        .unwrap();
+    println!("{recorder:#?}");
+    println!();
+}
+
 fn main() {
     let args = Args::parse();
-    println!("Args: {args:#?}");
+    let repo = git_repository::discover(args.repo).unwrap();
+    let commit = repo.head_commit().unwrap();
+    for ancestor in commit.ancestors().all().unwrap() {
+        let ancestor = repo
+            .find_object(ancestor.unwrap())
+            .unwrap()
+            .try_into_commit()
+            .unwrap();
+        print_commit(&ancestor);
+    }
 }