From efad275e1a3ca8beafcc115b0a7cb61caeb45604 Mon Sep 17 00:00:00 2001
From: Zixuan Chen <remch183@outlook.com>
Date: Sat, 19 Oct 2024 22:46:41 +0800
Subject: [PATCH] fix: forkAt should inherit the config and auto commit from
 the original doc

---
 crates/loro-internal/src/fork.rs |  4 ++++
 loro-js/tests/misc.test.ts       | 20 ++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/crates/loro-internal/src/fork.rs b/crates/loro-internal/src/fork.rs
index 0785be4c..2267d2b7 100644
--- a/crates/loro-internal/src/fork.rs
+++ b/crates/loro-internal/src/fork.rs
@@ -41,6 +41,10 @@ impl LoroDoc {
             })
             .unwrap();
         let doc = LoroDoc::new();
+        doc.set_config(&self.config);
+        if self.auto_commit.load(std::sync::atomic::Ordering::Relaxed) {
+            doc.start_auto_commit();
+        }
         doc.import(&bytes).unwrap();
         doc
     }
diff --git a/loro-js/tests/misc.test.ts b/loro-js/tests/misc.test.ts
index c4b0f398..72c59f70 100644
--- a/loro-js/tests/misc.test.ts
+++ b/loro-js/tests/misc.test.ts
@@ -290,6 +290,26 @@ describe("to json", () => {
   });
 });
 
+it("fork at", () => {
+  const doc = new LoroDoc();
+  doc.setPeerId("0");
+  doc.getText("text").insert(0, "Hello, world!");
+  console.log("0");
+  const newDoc = doc.forkAt([{ peer: "0", counter: 6 }]);
+  newDoc.setPeerId("1");
+  newDoc.getText("text").insert(6, " Alice!");
+  // ┌───────────────┐     ┌───────────────┐
+  // │    Hello,     │◀─┬──│     world!    │
+  // └───────────────┘  │  └───────────────┘
+  //                    │
+  //                    │  ┌───────────────┐
+  //                    └──│     Alice!    │
+  //                       └───────────────┘
+  doc.import(newDoc.export({ mode: "update" }));
+  console.log(doc.getText("text").toString()); // "Hello, world! Alice!"
+});
+
 function one_ms(): Promise<void> {
   return new Promise((resolve) => setTimeout(resolve, 1));
 }
+