feat: create a git repository

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "anyhow"
+version = "1.0.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34ac096ce696dc2fcabef30516bb13c0a68a11d30131d3df6f04711467681b04"
+
+[[package]]
+name = "mg"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+]

Cargo.toml

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+[package]
+name = "mg"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1.0.95"

src/main.rs

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+use anyhow::{Error, Result};
+use std::{fs, path::PathBuf};
+
+fn init_repository(path: PathBuf) -> Result<PathBuf> {
+    let git_dir = path.join(".git");
+
+    fs::create_dir(&git_dir)?;
+    fs::create_dir(git_dir.join("objects"))?;
+    fs::create_dir(git_dir.join("refs"))?;
+
+    fs::write(git_dir.join("HEAD"), "ref: refs/heads/main\n")?;
+
+    Ok(path)
+}
+
+fn main() -> Result<(), Error> {
+    let mut current_dir = std::env::current_dir()?;
+    let env_dir = std::env::var("REPO_PATH");
+
+    if let Ok(path) = env_dir {
+        current_dir = PathBuf::from(path);
+    }
+
+    let repository = init_repository(current_dir)?;
+
+    Ok(())
+}