Sample contractor usage

gistfile1.vala

void main () {

    var file = "/home/<user>/Downloads/woah_dude.gif";
    var mime = "image/gif";
    var contractor = new Granite.Services.Contractor.for_mime (mime);
    foreach (var contract in contractor.get_contracts ()) {
        print ("id: "+contract.id+" name:" +contract.display_name);
    }
    var option = readline ("Enter id");
    contractor.execute (id, file);
    //or
    contractor.get_contract(id).execute (file);
}