From 21876804cddff5862bcb280e463526e7de9119e6 Mon Sep 17 00:00:00 2001
From: Adam Bowker <adam.b@posthog.com>
Date: Tue, 31 Mar 2026 19:21:58 -0700
Subject: [PATCH] feat(code): new diff review panel

---
 apps/code/src/main/services/git/schemas.ts |  7 +++++++
 apps/code/src/main/services/git/service.ts |  8 ++++++++
 apps/code/src/main/trpc/routers/git.ts     |  9 +++++++++
 packages/git/src/queries.ts                | 12 ++++++++++++
 4 files changed, 36 insertions(+)

diff --git a/apps/code/src/main/services/git/schemas.ts b/apps/code/src/main/services/git/schemas.ts
index 8aedbc93f..ddf9bba2c 100644
--- a/apps/code/src/main/services/git/schemas.ts
+++ b/apps/code/src/main/services/git/schemas.ts
@@ -120,6 +120,13 @@ export const getFileAtHeadInput = z.object({
 });
 export const getFileAtHeadOutput = z.string().nullable();
 
+// getDiffHead schemas
+export const getDiffHeadInput = z.object({
+  directoryPath: z.string(),
+  ignoreWhitespace: z.boolean().optional(),
+});
+export const getDiffHeadOutput = z.string();
+
 // getDiffStats schemas
 export const getDiffStatsInput = directoryPathInput;
 export const getDiffStatsOutput = diffStatsSchema;
diff --git a/apps/code/src/main/services/git/service.ts b/apps/code/src/main/services/git/service.ts
index 5d1f62159..7483c6443 100644
--- a/apps/code/src/main/services/git/service.ts
+++ b/apps/code/src/main/services/git/service.ts
@@ -9,6 +9,7 @@ import {
   getCurrentBranch,
   getDefaultBranch,
   getDiffAgainstRemote,
+  getDiffHead,
   getDiffStats,
   getFileAtHead,
   getLatestCommit,
@@ -275,6 +276,13 @@ export class GitService extends TypedEventEmitter<GitServiceEvents> {
     return getFileAtHead(directoryPath, filePath);
   }
 
+  public async getDiffHead(
+    directoryPath: string,
+    ignoreWhitespace?: boolean,
+  ): Promise<string> {
+    return getDiffHead(directoryPath, { ignoreWhitespace });
+  }
+
   public async getDiffStats(directoryPath: string): Promise<DiffStats> {
     const stats = await getDiffStats(directoryPath, {
       excludePatterns: [".claude", "CLAUDE.local.md"],
diff --git a/apps/code/src/main/trpc/routers/git.ts b/apps/code/src/main/trpc/routers/git.ts
index 5c3627839..dfd3eab07 100644
--- a/apps/code/src/main/trpc/routers/git.ts
+++ b/apps/code/src/main/trpc/routers/git.ts
@@ -29,6 +29,8 @@ import {
   getCommitConventionsOutput,
   getCurrentBranchInput,
   getCurrentBranchOutput,
+  getDiffHeadInput,
+  getDiffHeadOutput,
   getDiffStatsInput,
   getDiffStatsOutput,
   getFileAtHeadInput,
@@ -136,6 +138,13 @@ export const gitRouter = router({
       getService().getFileAtHead(input.directoryPath, input.filePath),
     ),
 
+  getDiffHead: publicProcedure
+    .input(getDiffHeadInput)
+    .output(getDiffHeadOutput)
+    .query(({ input }) =>
+      getService().getDiffHead(input.directoryPath, input.ignoreWhitespace),
+    ),
+
   getDiffStats: publicProcedure
     .input(getDiffStatsInput)
     .output(getDiffStatsOutput)
diff --git a/packages/git/src/queries.ts b/packages/git/src/queries.ts
index 1a01d2186..1705488dc 100644
--- a/packages/git/src/queries.ts
+++ b/packages/git/src/queries.ts
@@ -935,6 +935,18 @@ export async function getUnstagedDiff(
   });
 }
 
+export async function getDiffHead(
+  baseDir: string,
+  options?: CreateGitClientOptions & { ignoreWhitespace?: boolean },
+): Promise<string> {
+  const manager = getGitOperationManager();
+  const args = ["HEAD"];
+  if (options?.ignoreWhitespace) args.push("--ignore-all-space");
+  return manager.executeRead(baseDir, (git) => git.diff(args), {
+    signal: options?.abortSignal,
+  });
+}
+
 export async function getDiffAgainstRemote(
   baseDir: string,
   baseBranch: string,