Create a new file exploiting a command in a WebIDE plugin

Question

I am developing a SAP WebIDE plugin and I need to give the user the possibility to create a new file right clicking on a custom project and executing my plugin command. Something similar occurs when you right click on a folder and select New>SAPUI5 view: running this command creates for you a view and its controller in the project tree.
How can I archieve that? I looked at the code of the service that takes care of the documents management but the createNew method is not implemented, yet. I was also considering to use the template service but I didn't find any documentation on how to call it through a command rather than through the template extension mechanism. Any help would be very appreciated.