Fragments don't get shown in RevealJS

[nicojs]

When running decktape in revealjs, fragments don't get shown.

For example, this:

### Fragments

Hide and show elements in a sequence with fragments.

```md
<div class="fragment">Fragment 1.</div>
<div class="fragment">Fragment 2.</div>
```

<div class="fragment">Fragment 1.</div>
<div class="fragment">Fragment 2.</div>

Gets printed as this:

I've traced the problem. Configuring fragments in the reveals plugin is possible, but it isn't possible to configure it.

See https://github.com/astefanutti/decktape/blob/master/plugins/reveal.js#L22

I'm pretty sure this used to work. I think cad6569 might have broken it.

[nicojs]

Ok, I found the issue. The options from reveal don't get applied when the command is automatic. This effectively makes automatic mode unusable for reveal presentations.

As mentioned, this used to work, so I think it is a regression.

Current workaround is to use "reveal" mode explicitly:

- decktape http://localhost:15000 out.pdf
+ decktape reveal http://localhost:15000 out.pdf

[astefanutti]

I wonder if that could be caused by 83771f9 instead.

My understanding is that fragments used to be disabled by default. It used to be possible to enable them via the URL, but indeed now it's a CLI option, it can only be enabled with decktape reveal --fragments.

[nicojs]

I think the fix should be to also apply options for discovered UI libraries using automatic mode.

[astefanutti]

Right, the automatic sub-command should ideally pass-through all the options to the selected plugin.