feat(vcs): expose repository branch metadata

packages/core/src/vcs.ts

@@ -2,7 +2,7 @@ export * as Vcs from "./vcs"
 
 import { Context, Effect, Layer } from "effect"
 import { FileDiff } from "@opencode-ai/schema/file-diff"
-import { FileStatus, Mode } from "@opencode-ai/schema/vcs"
+import { FileStatus, Info, Mode } from "@opencode-ai/schema/vcs"
 import { makeLocationNode } from "@opencode-ai/util/effect/app-node"
 import { FSUtil } from "@opencode-ai/util/fs-util"
 import { Location } from "./location"
@@ -10,13 +10,14 @@ import { AppProcess } from "@opencode-ai/util/process"
 import { VcsGit } from "./vcs/git"
 import { VcsHg } from "./vcs/hg"
 
-export { FileStatus, Mode }
+export { FileStatus, Info, Mode }
 
 export interface DiffOptions {
   readonly context?: number
 }
 
 export interface Interface {
+  readonly info: () => Effect.Effect<Info>
   readonly status: () => Effect.Effect<FileStatus[]>
   readonly diff: (mode: Mode, options?: DiffOptions) => Effect.Effect<FileDiff.Info[]>
 }
@@ -40,6 +41,10 @@ const layer = Layer.effect(
     const location = yield* Location.Service
     const impl = adapter(proc, fs, location)
     return Service.of({
+      info: Effect.fn("Vcs.info")(function* () {
+        if (!impl) return {}
+        return yield* impl.info()
+      }),
       status: Effect.fn("Vcs.status")(function* () {
         if (!impl) return []
         return yield* impl.status()

packages/core/src/vcs/git.ts

@@ -20,6 +20,12 @@ export function make(proc: AppProcess.Interface, input: { directory: string; wor
   const ctx: Ctx = { git: makeGit(proc), directory: input.directory, worktree: input.worktree }
 
   return {
+    info: Effect.fn("VcsGit.info")(function* () {
+      const [branch, root] = yield* Effect.all([ctx.git.branch(ctx.directory), ctx.git.defaultBranch(ctx.directory)], {
+        concurrency: 2,
+      })
+      return { branch, defaultBranch: root?.name }
+    }),
     status: Effect.fn("VcsGit.status")(function* () {
       const git = ctx.git
       const ref = (yield* git.hasHead(ctx.directory)) ? "HEAD" : undefined

packages/core/src/vcs/hg.ts

@@ -73,6 +73,9 @@ export function make(
   })
 
   return {
+    info: Effect.fn("VcsHg.info")(function* () {
+      return { branch: yield* hg.branch(), defaultBranch: "default" }
+    }),
     status: Effect.fn("VcsHg.status")(function* () {
       const [items, batch] = yield* Effect.all(
         // Zero-context patches are enough to count changed lines.