feat: display stream for half of terminal until finished, then display

index.ts

@@ -13,19 +13,65 @@ const { fullStream, reasoningText, text } = streamText({
   prompt: Bun.argv[2]!,
 });
 
+const moveCursor = (x: number, y: number) =>
+  new Promise<void>((resolve) => process.stdout.moveCursor(x, y, resolve));
+const clearScreenDown = () =>
+  new Promise<void>((resolve) => process.stdout.clearScreenDown(resolve));
+
+let lineCount = 0;
+let charsSinceNL = 0;
+const [numColumns, numRows] = process.stdout.getWindowSize();
+
 for await (const part of fullStream) {
   if (part.type === "reasoning-start") {
     process.stdout.write("\u001b[2m\n");
   } else if (part.type === "reasoning-delta") {
-    process.stdout.write(part.text.replaceAll('\n', '\n    '));
+    process.stdout.write(part.text);
+
+    charsSinceNL += part.text.length;
+    if (part.text.includes("\n")) {
+      lineCount += part.text.match(/\n/g)?.length ?? 1;
+      charsSinceNL = 0;
+    } else if (charsSinceNL >= numColumns) {
+      lineCount++;
+      charsSinceNL = charsSinceNL - numColumns;
+    }
+
+    if (lineCount >= numRows / 2) {
+      await moveCursor(0, -lineCount);
+      await clearScreenDown();
+      lineCount = 0;
+      charsSinceNL = 0;
+    }
   } else if (part.type === "reasoning-end") {
     process.stdout.write("\n\u001b[22m");
+    await moveCursor(0, -lineCount - 2);
+    await clearScreenDown();
+    lineCount = 0;
+    charsSinceNL = 0;
   } else if (part.type === "text-start") {
     process.stdout.write("\n");
   } else if (part.type === "text-delta") {
     process.stdout.write(part.text);
+
+    charsSinceNL += part.text.length;
+    if (part.text.includes("\n")) {
+      lineCount += part.text.match(/\n/g)?.length ?? 1;
+      charsSinceNL = 0;
+    } else if (charsSinceNL >= numColumns) {
+      lineCount++;
+      charsSinceNL = charsSinceNL - numColumns;
+    }
+
+    if (lineCount >= numRows / 2) {
+      await moveCursor(0, -lineCount);
+      await clearScreenDown();
+      lineCount = 0;
+      charsSinceNL = 0;
+    }
   } else if (part.type === "text-end") {
-    process.stdout.write("\n");
+    await moveCursor(0, -lineCount - 1);
+    await clearScreenDown();
   }
 }
 
@@ -34,3 +80,8 @@ const response = await text;
 
 Bun.file("reasoning.md").write(reasoning ?? "");
 Bun.file("response.md").write(response);
+
+Bun.spawnSync({
+  cmd: ["glow", "response.md"],
+  stdio: ["inherit", "inherit", "inherit"],
+});