Croma

Elixir macro utilities.

Usage

• Add :croma as a mix dependency.
• $ mix deps.get
• Add use Croma to import all macros defined in this package.
• Hack!

Croma.Defpt.defpt

Unit-testable defp that is simply converted to

• def if Mix.env == :test,
• defp otherwise.

Croma.Defun

Type specification oriented function definition

• Example 1

  import Croma.Defun
  defun f(a: integer, b: String.t) :: String.t do
    "#{a} #{b}"
  end
  

is expanded to ex @spec f(integer, String.t) :: String.t def f(a, b) do "#{a} #{b}" end

• Example 2

  import Croma.Defun
  defun dumbmap(as: [a], f: (a -> b)) :: [b] when a: term, b: term do
    ([]     , _) -> []
    ([h | t], f) -> [f.(h) | dumbmap(t, f)]
  end
  

is expanded to ex @spec dumbmap([a], (a -> b)) :: [b] when a: term, b: term def dumbmap(as, f) def dumbmap([], _) do [] end def dumbmap([h | t], f) do [f.(h) | dumbmap(t, f)] end

• There are also defunp and defunpt macros for private functions.
• Known limitations:
  • Pattern matching against function parameters should use (param1, param2) when guards -> block style.
  • Overloaded typespecs are not supported.