Wire in the branch name

crates/fs/src/repository.rs

@@ -5,6 +5,7 @@ use std::{
     path::{Component, Path, PathBuf},
     sync::Arc,
 };
+use util::ResultExt;
 
 pub use git2::Repository as LibGitRepository;
 
@@ -13,6 +14,8 @@ pub trait GitRepository: Send {
     fn reload_index(&self);
 
     fn load_index_text(&self, relative_file_path: &Path) -> Option<String>;
+
+    fn branch_name(&self) -> Option<String>;
 }
 
 impl std::fmt::Debug for dyn GitRepository {
@@ -52,6 +55,12 @@ impl GitRepository for LibGitRepository {
         }
         None
     }
+
+    fn branch_name(&self) -> Option<String> {
+        let head = self.head().log_err()?;
+        let branch = String::from_utf8_lossy(head.shorthand_bytes());
+        Some(branch.to_string())
+    }
 }
 
 #[derive(Debug, Clone, Default)]
@@ -78,6 +87,10 @@ impl GitRepository for FakeGitRepository {
         let state = self.state.lock();
         state.index_contents.get(path).cloned()
     }
+
+    fn branch_name(&self) -> Option<String> {
+        None
+    }
 }
 
 fn check_path_to_repo_path_errors(relative_file_path: &Path) -> Result<()> {