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lib/cachex/macros.ex
defmodule Cachex.Macros do
@moduledoc false
# Provides a number of Macro utilities to make it more convenient to write new
# Macros. This module is a parent of various submodules which provide Macros
# for specific uses (to avoid bloating requires and imports). I'm pretty new
# to Macros so if anything in here (or in submodules) can be done more efficiently,
# feel free to suggest.
# add various aliases
alias Cachex.Util
@doc """
Fetches the name and arguments from a given function and returns them inside a
tuple. We use `Macro.decompose_call/1` under the hood to do this.
"""
def name_and_args(head) do
head
|> short_head
|> Macro.decompose_call
end
# We use this to normalize functions with/without guards
defp short_head({ :when, _, [head | _] }), do: head
defp short_head(head), do: head
@doc """
Trim all defaults from a set of arguments - this is requried in case we want
to pass arguments through to another function.
"""
def trim_defaults(args) do
Enum.map(args, fn(arg) ->
case elem(arg, 0) do
:\\ ->
arg
|> Util.last_of_tuple
|> List.first
_at ->
arg
end
end)
end
end