Removing the handlebars highlighters when a client toggles away from hbs window unintentionally causes
other clients attached to hbs windows to no longer highlight correctly. The only other option is to
copy the entire html highlighter and all of it's rules, but that seems like a maitenance headache.
So instead, just leave the hbs rules injected into the html rules once the user opens any handlebars file.
It's not ideal, but I'd say it's the least bad option.
- Removes -recurse from handlebars comments. Handlebars parsers (janl/mustache.js, ember-cli/ember-cli-htmlbars), do not treat comments as recursive, so don't highlight them as so.
- Creates shared/hbs-file highligher group. This represents a handlebars file, which is html that happens to contain some handlebars tags.
- Augments the shared/html highlighter when needed. Because handlebars lives inside of html, we need to add the highlighter inside of it. Since there's no way to scope modifications of a shared highlighter to a window, here I'm modifying/unmodifying the shared/html highlighter whenever the user attaches/detaches a filetype of "hbs" to/from the window.
- Matches namespaced helpers as well. In htmlbars, helpers (components) can have '/'s in them, so make sure to continue highlighting through those. Also removes unused capturing groups.
- Allows for de-indenting when closing a block expression
- Brings in html highlighter hooks
- Improves indent matching on close of yielded blocks. Previous version just flat out didn't work.
That means we can now have highlighters active at global, buffer, and
window scope. The add-highlighter and remove-highlighter syntax changed
to take the parent path (scope/group/...) as a mandatory argument,
superseeding the previous -group switch.
