Export default toggleLink behavior?

[joshfrench]

What do you think about exposing the default toggleLink handler for use in editor toolkits? I'm prepping the React editor for release and realizing I'd rather just use the core META+K dialog on the Link button instead of supplying our own form there.

Happy to submit a pull if you're up for it, although I'm not sure where the right place to export it would be. Thoughts on where best to expose it?

[bantic]

@joshfrench Yeah, that certainly seems fine. +1 to code reuse.
Exporting a top-level "UI" might make sense for this. It would be good use this opportunity to change toggleLink to accept a configurable method for showing the prompt, i.e. pass it a callback-accepting function to use to show the prompt:

function toggleLink(editor, showPrompt=defaultShowPrompt) {
  ...
  let myPromptCallback = (url) => /* ... toggleMarkupWithUrl... */;
  showPrompt(message, defaultValue, myPromptCallback);
}

let defaultShowPrompt = (defaultValue, callback) => callback(window.prompt(message, defaultValue));

Exporting it as Mobiledoc.UI.toggleLink seems ok — what do you think?
If we do this we can also remove Editor#showPrompt as it is not used anywhere else.

[joshfrench]

Looks good to me, I'll put together a patch this week. Thanks!

[bantic]

closed by #491. thanks @joshfrench !