That should happen automatically. The highlighting is broken since it’s a code snippet, it works fine in Intellij for me:
My file types:
niknetniko
drl123
Yes, exactly. Select the Embedded Elixir file type and click the + sign. It will ask you for the template language and select HTML. Obviously, you’ll need to do the same for *.html.leex if using LiveView templates too. Once I do that, the syntax highlighting works and even the Emmet shortcuts for building HTML elements!
It may be RubyMine (or any small IDE) specific. I don’t have IntelliJ on this machine to check.
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joe
EDIT: Found an update, everything works now. Woohoo!
This is amazing. Not perfect yet, but definitely awesome.
I just donated a coffee to @KronicDeth. Thank you so much! 
FYI: The link if anyone else is interested: GitHub - KronicDeth/intellij-elixir: Elixir plugin for JetBrain's IntelliJ Platform (including Rubymine) · GitHub
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KronicDeth
Thank you, @joe, but I can’t take the credit. The formatter change was actually a community contribution from niknetniko (Niko Strijbol) · GitHub. All I did was the review and merge on that one.
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joe
Sadly the autocompletion for both html feels a lot worse than it did when I had set it to twig.
When I type <div cl it used to create the rest for me <div class=""></div>.
Also my live template didn’t work anymore.
The workaround was to create it in the elixir language section and make it available for html files at the bottom.
Maybe this will help someone.
If you have an idea how to get my html autocompletion back, please share it with me.
Maybe I should make my template language into something else than html? Or change all live templates of zen html and zen css to be applicable in elixir files?
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