How to change icon/emblem of a directory from bash

I'm playing around with get_iplayer (fantastic) it's running every few hours to grab any new episodes of whatever....

After it has finished grabbing anything new i'd like to change the emblem of ~/Videos to add a plus or star (nautilus emblem preferably)

Do i go about this via nautilus?

Do i need to change some开发者_Python百科thing in gnome-config?

I'm sure this can't be FS level?

Cheers for any links and advice.

gvfs-set-attribute ~/Videos -t stringv metadata::emblems new urgent

gvfs-set-attribute -t string $FOLDER metadata::custom-icon file:///home/user/path/to/icon.jpg

There's a package called libnautilus that provides tools for working with nautilus, including emblems. It's what Dropbox uses, for example, to add emblems showing sync status. You could try looking at the source of that.