A huge thanks to lachieh for all of the new goodies, including support for Statamic 3! Find out more in the pull request.
This started as a weekend project to bring Statamic tag syntax highlighting to Sublime Text. I pulled a lot of the information for this from this ExpressionEngine bundle: https://github.com/fcgrx/ExpressionEngine2-Sublime-Text-3-Bundle and looking at this documentation: http://docs.sublimetext.info/en/latest/extensibility/syntaxdefs.html. In all honesty, I still don't understand why much of the syntax works. I was able to port the Sublime Text version over to Atom. I have a much better understanding of how grammars work now, so future versions should work much better.
I called this Antlers because it was just fun... I mean, heck... everything about Statamic is fun.
Statamic (http://statamic.com) is a no-database, flat-file content management system that is far more capable than you would ever expect it to be. It's crazy fun to develop with as well.
This extension now essentially replaces the HTML syntax so that Antlers will take advantage of HTML intellisense and Emmet, so I recommend only enabling it for Statamic projects. You can do this via the "Enable (Workspace)" option.
Note that you won't have to select Antlers as your language -- if enabled, it will automatically kick in for any .html, .htm, or .xhtml file.
Update your VSC settings, p.e.:
"beautify.language": {
"html": [
"htm",
"html",
"antlers"
]
}