effectify Bus service: migrate to Effect PubSub + InstanceState (#18579)

packages/opencode/test/fixture/fixture.ts

@@ -2,7 +2,10 @@ import { $ } from "bun"
 import * as fs from "fs/promises"
 import os from "os"
 import path from "path"
+import { Effect, FileSystem, ServiceMap } from "effect"
+import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process"
 import type { Config } from "../../src/config/config"
+import { Instance } from "../../src/project/instance"
 
 // Strip null bytes from paths (defensive fix for CI environment issues)
 function sanitizePath(p: string): string {
@@ -71,3 +74,68 @@ export async function tmpdir<T>(options?: TmpDirOptions<T>) {
   }
   return result
 }
+
+/** Effectful scoped tmpdir. Cleaned up when the scope closes. Make sure these stay in sync */
+export function tmpdirScoped(options?: { git?: boolean; config?: Partial<Config.Info> }) {
+  return Effect.gen(function* () {
+    const fs = yield* FileSystem.FileSystem
+    const spawner = yield* ChildProcessSpawner.ChildProcessSpawner
+    const dir = yield* fs.makeTempDirectoryScoped({ prefix: "opencode-test-" })
+
+    const git = (...args: string[]) =>
+      spawner.spawn(ChildProcess.make("git", args, { cwd: dir })).pipe(Effect.flatMap((handle) => handle.exitCode))
+
+    if (options?.git) {
+      yield* git("init")
+      yield* git("config", "core.fsmonitor", "false")
+      yield* git("config", "user.email", "test@opencode.test")
+      yield* git("config", "user.name", "Test")
+      yield* git("commit", "--allow-empty", "-m", "root commit")
+    }
+
+    if (options?.config) {
+      yield* fs.writeFileString(
+        path.join(dir, "opencode.json"),
+        JSON.stringify({ $schema: "https://opencode.ai/config.json", ...options.config }),
+      )
+    }
+
+    return dir
+  })
+}
+
+export const provideInstance =
+  (directory: string) =>
+  <A, E, R>(self: Effect.Effect<A, E, R>): Effect.Effect<A, E, R> =>
+    Effect.servicesWith((services: ServiceMap.ServiceMap<R>) =>
+      Effect.promise<A>(async () =>
+        Instance.provide({
+          directory,
+          fn: () => Effect.runPromiseWith(services)(self),
+        }),
+      ),
+    )
+
+export function provideTmpdirInstance<A, E, R>(
+  self: (path: string) => Effect.Effect<A, E, R>,
+  options?: { git?: boolean; config?: Partial<Config.Info> },
+) {
+  return Effect.gen(function* () {
+    const path = yield* tmpdirScoped(options)
+    let provided = false
+
+    yield* Effect.addFinalizer(() =>
+      provided
+        ? Effect.promise(() =>
+            Instance.provide({
+              directory: path,
+              fn: () => Instance.dispose(),
+            }),
+          ).pipe(Effect.ignore)
+        : Effect.void,
+    )
+
+    provided = true
+    return yield* self(path).pipe(provideInstance(path))
+  })
+}