fix(cli): retain the audio track when scaffolding from an audio file

packages/cli/src/commands/init.test.ts

@@ -249,6 +249,30 @@ describe("hyperframes init flag rename", () => {
     }
   });
 
+  it("wires --audio into the composition without creating a video clip", () => {
+    const dir = mkdtempSync(join(tmpdir(), "hf-init-audio-test-"));
+    const target = join(dir, "proj");
+    const audio = join(dir, "track.wav");
+    copyFileSync(
+      resolve(
+        fileURLToPath(import.meta.url),
+        "../../../../producer/tests/audio-mux-parity/src/assets/tone.wav",
+      ),
+      audio,
+    );
+    try {
+      const res = runInit([target, "--non-interactive", "--skip-transcribe", "--audio", audio]);
+      expect(res.status).toBe(0);
+      const html = readFileSync(join(target, "index.html"), "utf-8");
+      expect(html).toMatch(/<audio\b[^>]*src="track\.wav"/);
+      expect(html).not.toMatch(/<video\b/);
+      expect(html).not.toContain("__VIDEO_SRC__");
+      expect(readFileSync(join(target, "track.wav"))).toEqual(readFileSync(audio));
+    } finally {
+      rmSync(dir, { recursive: true, force: true });
+    }
+  });
+
   it("uses the video stream duration when audio outlasts the final video frame", () => {
     expect(
       resolveVideoDurationSeconds({

packages/cli/src/commands/init.ts

@@ -347,6 +347,7 @@ function patchVideoSrc(
   dir: string,
   videoFilename: string | undefined,
   durationSeconds?: number,
+  audioFilename?: string,
 ): void {
   const htmlFiles = readdirSync(dir, { withFileTypes: true, recursive: true })
     .filter((e) => e.isFile() && e.name.endsWith(".html"))
@@ -360,9 +361,13 @@ function patchVideoSrc(
       // Remove video elements with placeholder src
       content = content.replace(/<video[^>]*src="__VIDEO_SRC__"[^>]*>[\s\S]*?<\/video>/g, "");
       content = content.replace(/<video[^>]*src="__VIDEO_SRC__"[^>]*>/g, "");
-      // Remove audio elements with placeholder src
-      content = content.replace(/<audio[^>]*src="__VIDEO_SRC__"[^>]*>[\s\S]*?<\/audio>/g, "");
-      content = content.replace(/<audio[^>]*src="__VIDEO_SRC__"[^>]*>/g, "");
+      if (audioFilename) {
+        content = content.replaceAll("__VIDEO_SRC__", audioFilename);
+      } else {
+        // Remove audio elements with placeholder src
+        content = content.replace(/<audio[^>]*src="__VIDEO_SRC__"[^>]*>[\s\S]*?<\/audio>/g, "");
+        content = content.replace(/<audio[^>]*src="__VIDEO_SRC__"[^>]*>/g, "");
+      }
     }
     // Patch duration — use probed duration or default
     const dur = durationSeconds ? String(Math.round(durationSeconds * 100) / 100) : "10";
@@ -561,6 +566,7 @@ async function scaffoldProject(
   tailwind = false,
   resolution?: CanvasResolution,
   authoringSkill?: string,
+  localAudioName?: string,
 ): Promise<void> {
   mkdirSync(destDir, { recursive: true });
 
@@ -573,7 +579,7 @@ async function scaffoldProject(
   } else {
     await fetchRemoteTemplate(templateId, destDir);
   }
-  patchVideoSrc(destDir, localVideoName, durationSeconds);
+  patchVideoSrc(destDir, localVideoName, durationSeconds, localAudioName);
   if (tailwind) writeTailwindSupport(destDir);
   if (resolution) applyResolutionPreset(destDir, resolution);
 
@@ -913,6 +919,7 @@ export default defineCommand({
           tailwind,
           resolutionPreset,
           args.skill,
+          audioFlag ? basename(audioFlag) : undefined,
         );
       } catch (err) {
         console.error(
@@ -1128,6 +1135,7 @@ export default defineCommand({
         tailwind,
         resolutionPreset,
         args.skill,
+        audioFlag ? basename(audioFlag) : undefined,
       );
       if (!isBundled) {
         spin.stop(c.success(`Downloaded ${templateId}`));