Add creation of audio directory and remove unused function in download package

internal/application/application.go

@@ -189,6 +189,13 @@ func Run() {
 
 	audioDir := filepath.Join(config.AssetsDir, "audio")
 
+	_, err = os.Stat(audioDir)
+	if os.IsNotExist(err) {
+		if err = os.MkdirAll(audioDir, 0740); err != nil {
+			logger.Error("unable to create audio directory: %v", err)
+		}
+	}
+
 	go download.DownloadAudioFiles(app.PageRouter.Context.MessageChannel, audioDir, "https://files.radiantwavetech.com/audio/")
 
 	app.runEventLoop()

internal/download/Download.go

@@ -194,19 +194,6 @@ func fileMD5(path string) (string, error) {
 	return fmt.Sprintf("%x", h.Sum(nil)), nil
 }
 
-// remoteFileSize does a HEAD request and returns Content-Length.
-func remoteFileSize(url string) (int64, error) {
-	resp, err := http.Head(url)
-	if err != nil {
-		return 0, err
-	}
-	resp.Body.Close()
-	if resp.StatusCode != http.StatusOK {
-		return 0, fmt.Errorf("HEAD %s: %s", url, resp.Status)
-	}
-	return resp.ContentLength, nil
-}
-
 // downloadFile streams url to destPath, calling onChunk(n) after each write
 // with the number of bytes just written. Returns total bytes downloaded.
 func downloadFile(url, destPath string, onChunk func(int64)) (int64, error) {