Directives to improve language-specific coloring

[thiagomajesk]

Hi! I'd like to know what would be the contribution process to improve the highlight of some specific language. I see that there's a Ruby demo here and it seems that it's a little more flavorful than what I get with Elixir.

For example:

• Both Ruby & Elixir module names are "white", but Ruby classes have a "yellow" color. I guess that for Elixir the mapping would be: Ruby classes -> Elixir Modules

• In Ruby there are class variables and instance variables, in Elixir we only have module attributes. But everything in Elixir that starts with "@" is colored "green"

• Ruby methods are colored "blue", but elixir functions are colored "green". Piggybacking on the last item, since we usually use module attributes next to functions, it gets too "greenish" in that zone.

This is an example comparing both:

And here's a code snippet (don't try to compile that), that tries to demonstrate some of the language aspects:

defmodule ExampleModule do
  @moduledoc """
  Module documentation
  """

  require Another.Module

  import Another.Module

  alias Another.Module

  @type type() :: __MODULE__

  @module_attribute 1

  defstruct [:field1, :field2, field3: "Optional", field4: 42, field5: []] 

  def function_examples do
    function_with_args(:arg)
    function_no_args
  end

  def list_access do
    list = [1, 2] ++ [3]

    list
    |> Enum.uniq()
    |> Enum.at(1)      
  end

  @deprecated "This function is deprecated"
  @spec deprecated_function(term()) :: term()
  def deprecated_function_with_spec(param), do: nil

  def map_access do
    atom_map = %{
      key1: "info",
      key2: "info"
    }

    string_map = %{
      "key1" => "info",
      "key2" => "info"
    }

    atom_map.key1
    atom_map[:key1]
    string_map["key2"]    
  end

  @doc """
  This function is very well documented
  """
  def output do
    IO.puts "Output here"
    IO.inspect(nil, label: "Output here")
  end

  def pattern_matching_function(%__MODULE__{field1: field1}) when not is_nil(field1) do
    "I am function with pattern matching and guards!"
  end

  def pattern_matching_function(%__MODULE__{field1: field1}) do
      "I am function with pattern matching!"
  end  

  defmacro metaprogramming_macro(param) do 
    quote do
      IO.inspect("Hello from #{__MODULE__}, #{unquote(param)})"
    end
  end

  defp other_function(opts \\ []) do
    IO.puts "doing other stuff #{0..42}"
  end

  defp another_private_function() do
    [1, 2, 3] |> Enum.each(fn item -> IO.puts(item) end)
  end

  defp calling_erlang_modules(), do: :millisecond |> :os.system_time() |> to_string()

end

BTW: Would it be possible to publish the current color palette somewhere? This way I could test locally and suggest changes based that on what it's working for me. Also, I can't find any information about the current guideline the theme uses to color language constructs - if there's one, this would be really helpful.