Improved sorta

example.js

var sort = sorta(Widget)

var stream = SpliceStream()

// A sorta instance is a writable splicestream. Pipe any readable splice stream into 
// it
stream.pipe(sort)

var list = stream.createList()

list.add(...)
list.remove(...)
list.move(item, newpos)
list.sort(sortFunction)

// Called for every unique item added to the list
// Will pipe the widget in & out of the item (the item is a stream or an object
// which has a createStream method which will be called)
function Widget() {
    var stream = DeltaStream()

    /* render logic */

    return stream
}

sorta.js

function sorta(createStream) {
    var stream = SpliceStream()
        , list = stream.createList()
        , ul = document.createElement("ul")
        , widgets = {}

    list.on("add", function (stream) {
        var sync = stream.sync
        if (stream.createStream) {
            stream = stream.createStream()
        }

        var widget = createStream()

        widgets[stream.id] = widget

        stream.pipe(widget).pipe(stream)
        if (widget.appendTo) {
            widget.appendTo(ul)
        }

        if (sync) {
            sync(widget)
        }
    })

    list.on("remove", function (stream) {
        if (stream.createStream) {
            stream = stream.createStream()
        }

        var widget = widgets[stream.id]

        if (widget.destroy) {
            widget.destroy()
        }
    })

    list.on("move", function (stream) {
        if (stream.createStream) {
            stream = stream.createStream()
        }

        var widget = widgets[stream.id]

        /* move logic */
    })
}