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shdblowers/file_printer.ex

Created October 26, 2018 16:49
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file_printer.ex
defmodule FilePrinter do
@callback parse(String.t) :: {:ok, term} | {:error, String.t}
@callback extensions() :: [String.t]
defmacro __using__(_opts) do
quote do
def output(parsed_str) do
IO.puts(parsed_str)
end
def print(str), do: str |> parse() |> output()
end
end
end
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