refactor: move final rendering into Renderer class

src/render/index.ts

@@ -131,12 +131,27 @@ export default class Renderer {
     }
   }
 
-  renderStats(usage: LanguageModelUsage, start: number, stop: number) {
-    const { inputTokens, outputTokens } = usage;
+  async renderStats(
+    usage: PromiseLike<LanguageModelUsage>,
+    start: number,
+    stop: number,
+  ) {
+    const { inputTokens, outputTokens } = await usage;
     const context = (inputTokens ?? 0) / 1000;
     const output = (outputTokens ?? 0) / 1000;
     const time = (stop - start) / 1000;
     const template = `Context: ${context.toFixed(1)}k, Output: ${output.toFixed(1)}k, Time: ${time.toFixed(2)}s\n`;
     process.stderr.write(chalkStderr.dim(template));
   }
+
+  async renderFinal(textStream: AsyncIterableStream<string>) {
+    if (this.isPlain) return;
+
+    const [width] = process.stdout.getWindowSize();
+    await Bun.spawn({
+      cmd: ["glow", "-w", `${width}`, "-"],
+      stdin: textStream,
+      stdout: "inherit",
+    }).exited;
+  }
 }