Setting event handlers to termux-download

[aurium]

Feature description
Pooling the FS is not the best way to wait for a file or discover when the download fails.

Would be nice if termux-download had a --onerror and --onsuccess parameters to set a command to run on background, like --action from termux-notification.

Background information
Have you checked if the feature is accessible through the android API?
I believe this means yes.

Do you know of other open-source apps that has a similar feature as the one you want? (Provide links)
Node.js's standard HTTP client and other unblocking implementations.