Handy scopes & lenses generator Python library, Singlet 0.3, adds Unity Previews support
Along with numerous features, improvements and refinements, Unity 6.x introduced the Previews, a fancy manner of accessing extra details (including images, long pieces of text, retweet action, etc), allowing users (under Ubuntu 12.10), by right-clicking on an item from the Dash, to benefit a dedicated Dash preview mode, mode designed and implemented in relation to needed per-lens functionalities.
Lenses are available both as default and non-default, latter category that it seems naturally to pursue the implementation of Previews (suitable for the upcoming Quantal Quetzal) with numerous available actions and details, approach that is to be probably perceived as a requirement for high-quality lenses, as well as a completion in consistency (probably, after using Ubuntu 12.10's Unity for a couple of months, users will become accustomed to right-clicking on Dash's items).
Singlet is a handy Python library, presenting itself as an easy mean for building Unity lenses and scopes, providing a collection of classes and meta-classes necessary to build various lens types and scopes.
Singlet 0.3 has been released, adding Unity Previews support, furthermore, automatically enabling the Previews for the Singlet 0.2-based scopes, meaning, the 0.3 release will populate a Dash item's preview mode with the item's title, image and description, basically, while replicating the data, Singlet 0.3 enables the Previews, from where the developer can properly adjust, enrich, tweak, etc, the preview mode's displayed details.
Further details, related to proper yet easy manners of adding custom preferred data to previews, are available on http://mhall119.com/2012/10/singlet-0-3-adds-unity-previews/