feat(core): allow external workspace creation (#26212)

packages/opencode/src/worktree/index.ts

@@ -117,6 +117,13 @@ export const ResetFailedError = NamedError.create(
   }),
 )
 
+export const ListFailedError = NamedError.create(
+  "WorktreeListFailedError",
+  z.object({
+    message: z.string(),
+  }),
+)
+
 function slugify(input: string) {
   return input
     .trim()
@@ -149,6 +156,7 @@ export interface Interface {
   readonly makeWorktreeInfo: (name?: string) => Effect.Effect<Info>
   readonly createFromInfo: (info: Info, startCommand?: string) => Effect.Effect<void>
   readonly create: (input?: CreateInput) => Effect.Effect<Info>
+  readonly list: () => Effect.Effect<(Omit<Info, "branch"> & { branch?: string })[]>
   readonly remove: (input: RemoveInput) => Effect.Effect<boolean>
   readonly reset: (input: ResetInput) => Effect.Effect<boolean>
 }
@@ -341,6 +349,32 @@ export const layer: Layer.Layer<
       return undefined
     })
 
+    const list = Effect.fn("Worktree.list")(function* () {
+      const ctx = yield* InstanceState.context
+      if (ctx.project.vcs !== "git") {
+        return []
+      }
+
+      const result = yield* git(["worktree", "list", "--porcelain"], { cwd: ctx.worktree })
+      if (result.code !== 0) {
+        throw new ListFailedError({ message: result.stderr || result.text || "Failed to read git worktrees" })
+      }
+
+      const primary = yield* canonical(ctx.worktree)
+      return yield* Effect.forEach(parseWorktreeList(result.text), (entry) =>
+        Effect.gen(function* () {
+          if (!entry.path) return undefined
+          const directory = yield* canonical(entry.path)
+          if (directory === primary) return undefined
+          return {
+            name: pathSvc.basename(directory),
+            directory,
+            ...(entry.branch ? { branch: entry.branch.replace(/^refs\/heads\//, "") } : {}),
+          }
+        }),
+      ).pipe(Effect.map((items) => items.filter((item) => item !== undefined)))
+    })
+
     function stopFsmonitor(target: string) {
       return fs.exists(target).pipe(
         Effect.orDie,
@@ -579,7 +613,7 @@ export const layer: Layer.Layer<
       return true
     })
 
-    return Service.of({ makeWorktreeInfo, createFromInfo, create, remove, reset })
+    return Service.of({ makeWorktreeInfo, createFromInfo, create, list, remove, reset })
   }),
 )