From f047bb51814f781658968dc3af4fb06a7eca7e5e Mon Sep 17 00:00:00 2001
From: Patrick Marie <pm@mkz.me>
Date: Wed, 5 Feb 2025 22:55:27 +0100
Subject: [PATCH] feat: adding log

---
 src/log.rs  | 29 +++++++++++++++++++++++++++++
 src/main.rs |  7 +++++++
 2 files changed, 36 insertions(+)
 create mode 100644 src/log.rs

diff --git a/src/log.rs b/src/log.rs
new file mode 100644
index 0000000..707570f
--- /dev/null
+++ b/src/log.rs
@@ -0,0 +1,29 @@
+use crate::repository::Repository;
+
+use anyhow::Result;
+use hex::FromHex;
+
+impl Repository {
+    pub fn log(&self) -> Result<()> {
+        let mut current_commit = self.current_commit()?;
+
+        loop {
+            let mut commit = self.read_object(&hex::encode(current_commit))?;
+
+            let commit_desc = commit.string()?;
+            let lines = commit_desc.lines().collect::<Vec<&str>>();
+
+            println!("{} {}", hex::encode(current_commit), lines[lines.len() - 1]);
+
+            let parent_commit_id = lines.iter().find(|line| line.starts_with("parent "));
+            if parent_commit_id.is_none() {
+                break;
+            }
+
+            let parent_commit_id = parent_commit_id.unwrap();
+            current_commit = <[u8; 20]>::from_hex(parent_commit_id.split_once(' ').unwrap().1)?;
+        }
+
+        Ok(())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 5fed1b0..65b20b4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,6 +8,7 @@ use clap::Subcommand;
 mod commit;
 mod error;
 mod kind;
+mod log;
 mod object;
 mod repository;
 mod tree;
@@ -56,6 +57,8 @@ enum Command {
         /// The commit to show
         hash: Option<String>,
     },
+    /// Show the commit log
+    Log,
 }
 
 fn main() -> Result<(), Error> {
@@ -92,6 +95,10 @@ fn main() -> Result<(), Error> {
             Ok(_) => (),
             Err(e) => eprintln!("Failed to show: {}", e),
         },
+        Command::Log => match repo.log() {
+            Ok(_) => (),
+            Err(e) => eprintln!("Failed to show log: {}", e),
+        },
     }
 
     Ok(())