From f9e7ef493a22d06e312954ee47a90ac8f1f2157c Mon Sep 17 00:00:00 2001
From: HouXiaoxuan <Hou_Xiaoxuan@163.com>
Date: Thu, 21 Dec 2023 23:01:05 +0800
Subject: [PATCH] =?UTF-8?q?git=20log=E5=AE=9E=E7=8E=B0=E4=B8=8E=E6=B5=8B?=
 =?UTF-8?q?=E8=AF=95?=
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Content-Type: text/plain; charset=UTF-8
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---
 src/cli.rs          | 12 ++++++
 src/commands/log.rs | 97 +++++++++++++++++++++++++++++++++++++++++++++
 src/commands/mod.rs |  1 +
 src/head.rs         |  4 +-
 4 files changed, 112 insertions(+), 2 deletions(-)
 create mode 100644 src/commands/log.rs

diff --git a/src/cli.rs b/src/cli.rs
index 9e08840..67216cd 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -2,6 +2,7 @@ use clap::{Parser, Subcommand};
 use mit::commands::add::add;
 use mit::commands::commit::commit;
 use mit::commands::init::init;
+use mit::commands::log::log;
 use mit::commands::remove::remove;
 
 /// Rust实现的简易版本的Git，用于学习Rust语言
@@ -50,6 +51,14 @@ enum Command {
         #[clap(long, action)]
         allow_empty: bool,
     },
+    /// log 现实提交历史
+    Log {
+        #[clap(short = 'A', long)]
+        all: bool,
+
+        #[clap(short, long)]
+        number: Option<usize>,
+    },
 }
 pub fn handle_command() {
     let cli = Cli::parse();
@@ -66,5 +75,8 @@ pub fn handle_command() {
         Command::Commit { message, allow_empty } => {
             commit(message, allow_empty);
         }
+        Command::Log { all, number } => {
+            log(all, number);
+        }
     }
 }
diff --git a/src/commands/log.rs b/src/commands/log.rs
new file mode 100644
index 0000000..e0dcd35
--- /dev/null
+++ b/src/commands/log.rs
@@ -0,0 +1,97 @@
+use crate::{head, models::commit::Commit};
+use colored::Colorize;
+use core::num;
+use std::option;
+
+const DEFAULT_LOG_NUMBER: usize = 10;
+
+pub fn log(all: bool, number: Option<usize>) {
+    println!("log all: {:?}, number: {:?}", all, number);
+    let _ = __log(all, number);
+}
+
+pub fn __log(all: bool, number: Option<usize>) -> usize {
+    let mut log_count = 0usize;
+
+    let head = head::current_head();
+    let mut branch_name: Option<String> = None;
+    let mut head_commit = match head {
+        head::Head::Branch(_branch_name) => {
+            let commit = head::get_branch_head(&_branch_name);
+            branch_name = Some(_branch_name.clone());
+            if commit.is_empty() {
+                println!("当前分支{:?}没有任何提交", _branch_name);
+                return 0;
+            }
+            commit
+        }
+        head::Head::Detached(commit_hash) => commit_hash,
+    };
+
+    let mut number = match number {
+        Some(number) => number,
+        None => DEFAULT_LOG_NUMBER,
+    };
+
+    let mut first = true;
+    loop {
+        log_count += 1;
+        let commit = Commit::load(&head_commit);
+        if first {
+            first = false;
+            print!(
+                "{}{}{}{}",
+                "commit ".yellow(),
+                commit.get_hash().yellow(),
+                "(".yellow(),
+                "HEAD".blue()
+            );
+            if let Some(ref branch_name) = branch_name {
+                print!("{}", format!(" -> {}", branch_name).blue());
+            }
+            println!("{}", ")".yellow());
+        } else {
+            println!(
+                "{}{}{}{}{}",
+                "commit ".yellow(),
+                head_commit.yellow(),
+                "(".yellow(),
+                "HEAD".blue(),
+                ")".yellow()
+            );
+        }
+        println!("Author: {}", commit.get_author());
+        println!("Date:   {}", commit.get_date());
+        println!();
+        println!("    {}", commit.get_message());
+        println!();
+
+        if all == false {
+            if number > 1 {
+                number -= 1;
+            } else {
+                break;
+            }
+        }
+        if commit.get_parent_hash().len() == 0 {
+            break;
+        }
+        head_commit = commit.get_parent_hash().first().unwrap().clone();
+    }
+    log_count
+}
+
+#[cfg(test)]
+mod test {
+    use super::super::super::commands;
+    use crate::utils::util;
+    #[test]
+    fn test_log() {
+        util::setup_test_with_clean_mit();
+        assert_eq!(super::__log(false, None), 0);
+        commands::commit::commit("test commit 2".into(), true);
+        assert_eq!(super::__log(false, Some(1)), 1);
+        commands::commit::commit("test commit 3".into(), true);
+        assert_eq!(super::__log(false, None), 2);
+    }
+}
diff --git a/src/commands/mod.rs b/src/commands/mod.rs
index 6732aa1..fc651b0 100644
--- a/src/commands/mod.rs
+++ b/src/commands/mod.rs
@@ -3,3 +3,4 @@ pub mod commit;
 pub mod init;
 pub mod remove;
 pub mod status;
+pub mod log;
\ No newline at end of file
diff --git a/src/head.rs b/src/head.rs
index f0e54b1..a0c6506 100644
--- a/src/head.rs
+++ b/src/head.rs
@@ -19,7 +19,7 @@ pub fn current_head() -> Head {
         Head::Detached(head_content)
     }
 }
-fn update_branch(branch_name: &String, commit_hash: &String) {
+pub fn update_branch(branch_name: &String, commit_hash: &String) {
     // 更新分支head
     let mut branch = util::get_storage_path().unwrap();
     branch.push("refs");
@@ -28,7 +28,7 @@ fn update_branch(branch_name: &String, commit_hash: &String) {
     std::fs::write(&branch, commit_hash).expect(&format!("无法写入branch in {:?} with {}", branch, commit_hash));
 }
 
-fn get_branch_head(branch_name: &String) -> String {
+pub fn get_branch_head(branch_name: &String) -> String {
     // 返回当前分支的commit hash
     let mut branch = util::get_storage_path().unwrap();
     branch.push("refs");