refactor(vscode): change latestCheckpoint to worktree scope (#1007)

- Scope checkpoint commit messages with current working directory
- Update ShadowGitRepo to filter latest commit by grep pattern
- Remove unused getLatestCommitHash from CheckpointService

🤖 Generated with [Pochi](https://getpochi.com)

Co-authored-by: Pochi <[email protected]>

Author: zhanba

packages/vscode/src/integrations/checkpoint/checkpoint-service.ts

@@ -20,6 +20,8 @@ import { filterGitChanges, processGitChangesToFileEdits } from "./util";
 
 const logger = getLogger("CheckpointService");
 
+const checkpointCommitPrefix = (cwd: string) => `checkpoint-${cwd}-msg-`;
+
 @scoped(Lifecycle.ContainerScoped)
 @injectable()
 export class CheckpointService implements vscode.Disposable {
@@ -60,7 +62,9 @@ export class CheckpointService implements vscode.Disposable {
       const gitPath = await this.getShadowGitPath();
       this.shadowGit = await ShadowGitRepo.getOrCreate(gitPath, this.cwd);
       logger.trace("Shadow Git repository initialized at", gitPath);
-      this.latestCheckpoint.value = await this.shadowGit.getLatestCommitHash();
+      this.latestCheckpoint.value = await this.shadowGit.getLatestCommitHash(
+        checkpointCommitPrefix(this.cwd),
+      );
       this.readyDefer.resolve();
     } catch (error) {
       const errorMessage = toErrorMessage(error);
@@ -94,7 +98,7 @@ export class CheckpointService implements vscode.Disposable {
         return null;
       }
       await this.shadowGit.stageAll();
-      const commitMessage = `checkpoint-${message}`;
+      const commitMessage = `${checkpointCommitPrefix(this.cwd)}${message}`;
       const commitHash = await this.shadowGit.commit(commitMessage);
       logger.trace(
         `Successfully saved checkpoint with message: ${message}, commit hash: ${commitHash}`,
@@ -182,14 +186,6 @@ export class CheckpointService implements vscode.Disposable {
     return checkpointDir;
   }
 
-  async getLatestCommitHash() {
-    await this.ensureInitialized();
-    if (!this.shadowGit) {
-      throw new Error("Shadow Git repository not initialized");
-    }
-    return this.shadowGit.getLatestCommitHash();
-  }
-
   getCheckpointChanges = async (
     from: string,
     to?: string,

packages/vscode/src/integrations/checkpoint/shadow-git-repo.ts

@@ -120,10 +120,16 @@ export class ShadowGitRepo implements vscode.Disposable {
   }
 
   // Get the latest commit hash in short form
-  async getLatestCommitHash(): Promise<string | null> {
+  async getLatestCommitHash(search: string): Promise<string | null> {
     try {
-      const hash = await this.git.raw(["log", "-1", "--format=%h"]);
-      const trimmedHash = hash.trim();
+      const result = await this.git.raw([
+        "log",
+        "-1",
+        "--oneline",
+        "--grep",
+        search,
+      ]);
+      const trimmedHash = result.split(/\s+/)[0].trim();
       logger.debug(`Latest commit hash: ${trimmedHash}`);
       return trimmedHash || null;
     } catch (error) {