Improvements for font locking

[scohen]

I was getting elixir-ts-mode set up and noticed what I think are inconsistencies about how font locks are applied, and I'd like to help improve them, if that's what's requested.

I'm looking at what I think are Emacs's default font locks.

Consider the following snippet:

[key: :value]

The key: has font-lock-builtin-face applied, while :value has font-lock-type-face applied to it. They're both atoms, so I would expect for them to have the same face. I sort of understand why :value has the type face applied, since atoms are modules in erlang, though I would much rather have elixir modules look special and erlang modules look like atoms. It also seems to me that even if we limit ourselves to the default emacs faces, there's probably better faces to choose like font-lock-constant-face or font-lock-property-name-face.

In the following snippet;

  def test() do

the parens have font-lock-keyword-face despite not being keywords and font-lock-bracket-face existing in the emacs defaults.

Is this something that you'd be interested in working on with my help? I know next to nothing about treesitter or elisp.

[scohen]

To give you an idea of what the results are: This is elixir-mode

and this is elixir-ts-mode

[wkirschbaum]

Closing in favour of https://github.com/wkirschbaum/elixir-ts-mode/issues/35