diff --git a/lib/src/repo.rs b/lib/src/repo.rs
index 227070814..c918f71a1 100644
--- a/lib/src/repo.rs
+++ b/lib/src/repo.rs
@@ -16,12 +16,12 @@
 
 use std::collections::{HashMap, HashSet};
 use std::fmt::{Debug, Formatter};
-use std::fs;
 use std::io::ErrorKind;
 use std::ops::Deref;
 use std::path::{Path, PathBuf};
 use std::pin::Pin;
 use std::sync::Arc;
+use std::{fs, slice};
 
 use itertools::Itertools;
 use once_cell::sync::OnceCell;
@@ -915,38 +915,49 @@ impl MutableRepo {
     }
 
     pub fn add_head(&mut self, head: &Commit) {
+        self.add_heads(slice::from_ref(head));
+    }
+
+    pub fn add_heads(&mut self, heads: &[Commit]) {
         let current_heads = self.view.get_mut().heads();
         // Use incremental update for common case of adding a single commit on top a
         // current head. TODO: Also use incremental update when adding a single
         // commit on top a non-head.
-        if head
-            .parent_ids()
-            .iter()
-            .all(|parent_id| current_heads.contains(parent_id))
-        {
-            self.index.add_commit(head);
-            self.view.get_mut().add_head(head.id());
-            for parent_id in head.parent_ids() {
-                self.view.get_mut().remove_head(parent_id);
+        match heads {
+            [] => {}
+            [head]
+                if head
+                    .parent_ids()
+                    .iter()
+                    .all(|parent_id| current_heads.contains(parent_id)) =>
+            {
+                self.index.add_commit(head);
+                self.view.get_mut().add_head(head.id());
+                for parent_id in head.parent_ids() {
+                    self.view.get_mut().remove_head(parent_id);
+                }
             }
-        } else {
-            let missing_commits = dag_walk::topo_order_forward(
-                vec![head.clone()],
-                |commit: &Commit| commit.id().clone(),
-                |commit: &Commit| -> Vec<Commit> {
-                    commit
-                        .parent_ids()
-                        .iter()
-                        .filter(|id| !self.index().has_id(id))
-                        .map(|id| self.store().get_commit(id).unwrap())
-                        .collect()
-                },
-            );
-            for missing_commit in &missing_commits {
-                self.index.add_commit(missing_commit);
+            _ => {
+                let missing_commits = dag_walk::topo_order_forward(
+                    heads.iter().cloned(),
+                    |commit: &Commit| commit.id().clone(),
+                    |commit: &Commit| -> Vec<Commit> {
+                        commit
+                            .parent_ids()
+                            .iter()
+                            .filter(|id| !self.index().has_id(id))
+                            .map(|id| self.store().get_commit(id).unwrap())
+                            .collect()
+                    },
+                );
+                for missing_commit in &missing_commits {
+                    self.index.add_commit(missing_commit);
+                }
+                for head in heads {
+                    self.view.get_mut().add_head(head.id());
+                }
+                self.view.mark_dirty();
             }
-            self.view.get_mut().add_head(head.id());
-            self.view.mark_dirty();
         }
     }