From 6f706cd32f2c77cec71591ce1ec35ebeec5311df Mon Sep 17 00:00:00 2001
From: HouXiaoxuan <Hou_Xiaoxuan@163.com>
Date: Sat, 16 Dec 2023 21:40:35 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=9E=E7=8E=B0=E4=B8=80=E4=BA=9B=E6=95=B0?=
 =?UTF-8?q?=E6=8D=AE=E7=BB=93=E6=9E=84?=
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---
 src/objects/blob.rs   |  5 ++++-
 src/objects/commit.rs | 15 +++++++++++++++
 src/objects/tree.rs   | 17 +++++++++++++++++
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/objects/blob.rs b/src/objects/blob.rs
index ed3dcaa..277bd4e 100644
--- a/src/objects/blob.rs
+++ b/src/objects/blob.rs
@@ -1,6 +1,9 @@
 use crate::objects::object::Hash;
+/*Blob
+* Blob是git中最基本的对象，他储存一份文件的内容，并使用hash作为标识符。
+*/
 #[derive(Debug, Clone)]
 pub struct Blob {
     hash: Hash,
     data: String,
-}
\ No newline at end of file
+}
diff --git a/src/objects/commit.rs b/src/objects/commit.rs
index e69de29..eb2686f 100644
--- a/src/objects/commit.rs
+++ b/src/objects/commit.rs
@@ -0,0 +1,15 @@
+use super::object::Hash;
+/*Commit
+* git中版本控制的单位。
+* 一份Commit中对应一份版Tree，记录了该版本所包含的文件；parent记录本次commit的来源，形成了版本树；
+* 此外，Commit中还包含了作者、提交者、提交信息等。
+*/
+#[derive(Debug, Clone)]
+pub struct Commit {
+    hash: Hash,
+    author: String,    // unimplemented ignore
+    committer: String, // unimplemented ignore
+    message: String,
+    parent: Vec<Hash>, // parents commit hash
+    tree: String,      // tree hash
+}
diff --git a/src/objects/tree.rs b/src/objects/tree.rs
index e69de29..b67cf25 100644
--- a/src/objects/tree.rs
+++ b/src/objects/tree.rs
@@ -0,0 +1,17 @@
+use super::object::Hash;
+/*Tree
+* Tree是一个版本中所有文件的集合。从根目录还是，每个目录是一个Tree，每个文件是一个Blob。Tree之间互相嵌套表示文件的层级关系。
+* 每一个Tree对象也是对应到git储存仓库的一个文件，其内容是一个或多个TreeEntry。
+*/
+#[derive(Debug, Clone)]
+pub struct TreeEntry {
+    pub filemode: (String, String), // (type, mode), type: blob or tree; mode: 100644 or 04000
+    pub hash: Hash,                 // blob hash or tree hash
+    pub name: String,               // file name
+}
+
+#[derive(Debug, Clone)]
+pub struct Tree {
+    pub hash: Hash,
+    pub entries: Vec<TreeEntry>,
+}