feat: add get_git_base_dir

src/git.rs

@@ -1,5 +1,24 @@
+use std::path::PathBuf;
 use std::process::Command;
 
+pub fn get_git_base_path() -> Option<PathBuf> {
+    match PathBuf::from(".").canonicalize() {
+        Err(e) => {
+            warn!("Get current path failed: {}", e);
+            None
+        },
+        Ok(mut path) => loop {
+            if path.join(".git").is_dir() {
+                debug!("Found git base dir: {:?}", path)
+                return Some(path);
+            }
+            if !path.pop() {
+                return None;
+            }
+        }
+    }
+}
+
 pub fn check_git_status() -> bool {
     trace!("Run: git fetch --dry-run");
     match Command::new("git").env("LANG", "en_US").args(&["fetch", "--dry-run"]).output() {