feat(opencode): add interactive split-footer mode to run (#23557)

packages/opencode/test/cli/run/runtime.stdin.test.ts

@@ -0,0 +1,71 @@
+import { describe, expect, test } from "bun:test"
+import { Readable } from "node:stream"
+import { INTERACTIVE_INPUT_ERROR, resolveInteractiveStdin } from "@/cli/cmd/run/runtime.stdin"
+
+function stream(isTTY: boolean) {
+  return Object.assign(new Readable({ read() {} }), { isTTY }) as NodeJS.ReadStream
+}
+
+describe("run interactive stdin", () => {
+  test("reuses stdin when it is already a tty", () => {
+    const stdin = stream(true)
+    const seen: string[] = []
+    const result = resolveInteractiveStdin(
+      stdin,
+      (path) => {
+        seen.push(path)
+        return stream(true)
+      },
+      "linux",
+    )
+
+    expect(result.stdin).toBe(stdin)
+    expect(result.cleanup).toBeUndefined()
+    expect(seen).toEqual([])
+  })
+
+  test("opens the controlling terminal when stdin is piped", () => {
+    const tty = stream(true)
+    const seen: string[] = []
+    const result = resolveInteractiveStdin(
+      stream(false),
+      (path) => {
+        seen.push(path)
+        return tty
+      },
+      "linux",
+    )
+
+    expect(result.stdin).toBe(tty)
+    expect(seen).toEqual(["/dev/tty"])
+
+    result.cleanup?.()
+    expect(tty.destroyed).toBe(true)
+  })
+
+  test("uses CONIN$ on windows", () => {
+    const seen: string[] = []
+    resolveInteractiveStdin(
+      stream(false),
+      (path) => {
+        seen.push(path)
+        return stream(true)
+      },
+      "win32",
+    )
+
+    expect(seen).toEqual(["CONIN$"])
+  })
+
+  test("throws a clear error when no controlling terminal is available", () => {
+    expect(() =>
+      resolveInteractiveStdin(
+        stream(false),
+        () => {
+          throw new Error("open failed")
+        },
+        "linux",
+      ),
+    ).toThrow(INTERACTIVE_INPUT_ERROR)
+  })
+})