add (task) helper to pass in curried tasks

Presently the perform template helper essentially produces a closure action so that you can pass a task (w curried args) into a component and have it be invoked upon sendAction or this.attrs.actionName(). It seems desirable to be able to pass in a Task with curried args so that there’s feature parity w closure actions, and components maintain the ability to stylize themselves according to the isRunning state of the task.

[machty]

I think this is what you want (though you might want to rename some things):

// template
{{search-input on-input=search}}

// component
<input type="text" value={{query}} oninput={{perform on-input value="target.value"}}>
{{if (get on-input 'isRunning') "never true"}}

The perform helper produces a regular ol function that’s compatible with APIs expecting you to pass in closure actions / functions. The way you had it, you were basically doing a lookup of isRunning on a function, rather than a task. If you’re writing a component that is task-aware, you can just pass in the task directly, and then call perform on the task from within the component’s template.

[machty]

(task) has now been implemented and released in 0.6.0, as is support for value="..."; there is an example for value=“” at the bottom of http://ember-concurrency.com/#/docs/writing-tasks