core: add /vcs/diff endpoint to retrieve git diff for working tree or default branch comparison

packages/opencode/src/server/server.ts

@@ -38,6 +38,7 @@ import { websocket } from "hono/bun"
 import { HTTPException } from "hono/http-exception"
 import { errors } from "./error"
 import { Filesystem } from "@/util/filesystem"
+import { Snapshot } from "@/snapshot"
 import { QuestionRoutes } from "./routes/question"
 import { PermissionRoutes } from "./routes/permission"
 import { GlobalRoutes } from "./routes/global"
@@ -330,12 +331,39 @@ export namespace Server {
           },
         }),
         async (c) => {
-          const branch = await Vcs.branch()
           return c.json({
-            branch,
+            branch: await Vcs.branch(),
+            default_branch: await Vcs.defaultBranch(),
           })
         },
       )
+      .get(
+        "/vcs/diff",
+        describeRoute({
+          summary: "Get VCS diff",
+          description: "Retrieve the current git diff for the working tree or against the default branch.",
+          operationId: "vcs.diff",
+          responses: {
+            200: {
+              description: "VCS diff",
+              content: {
+                "application/json": {
+                  schema: resolver(Snapshot.FileDiff.array()),
+                },
+              },
+            },
+          },
+        }),
+        validator(
+          "query",
+          z.object({
+            mode: Vcs.Mode,
+          }),
+        ),
+        async (c) => {
+          return c.json(await Vcs.diff(c.req.valid("query").mode))
+        },
+      )
       .get(
         "/command",
         describeRoute({