add show-language plugin to prism build

[lislis]

shows snippet language automatically on hover. works automatically.
Looks like this out of the box

[BanzaiMan]

Nice!

[plaindocs]

Awesome!

The fiddly bit is displaying the filename, which is what requires the ugly CSS in Kramdown and the extra messing around. Do we think that is worth it?

[lislis]

@plaindocs I thought this would be accomplished with {: data-language=" a filename that is not technically a language"} after the code snippet? Or am I missing something?

[plaindocs]

I think there are some extra steps, but I get a bit lost reading through

PrismJS/prism#891
PrismJS/prism#910

Maybe from issue

pre[data-language]:before {
  content: attr(data-file);
  position: absolute;
  top: 0;
  right: 0;
}

is sufficient? Either way, just setting the CSS as you suggest isn't sufficient for it to display.

[lislis]

@plaindocs I made this #1235