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Earmark is a pure-Elixir Markdown converter. It is intended to be used as a library (just call Earmark.as_html), but can also be used as a command-line tool (run mix escript.build first). Output generation is pluggable.

Retired package: Deprecated - Earmark is no longer maintained. Migrate to a replacement, for example MDEx (https://hex.pm/packages/mdex).
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earmark lib tools tracer.ex
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lib/tools/tracer.ex 

# SPDX-License-Identifier: Apache-2.0

defmodule Tools.Tracer do

  defmacro deft(head, body) do

    {fun_name, args_ast} = name_and_args(head)



    decorated = decorate_args(args_ast)

    arg_names = decorated |> Enum.map(fn {x, _} -> x end)

    decorated_args = decorated |> Enum.map(fn {_, x} -> x end)



    head = Macro.postwalk(head,

      fn

        ({fun_ast, context, old_args}) when (

          fun_ast == fun_name and old_args == args_ast

        ) ->

          {fun_ast, context, decorated_args}

        (other) -> other

      end)



    quote do

      def unquote(head) do

        file = __ENV__.file

        line = __ENV__.line

        module = __ENV__.module



        function_name = unquote(fun_name)

        passed_args = unquote(arg_names) |> Enum.map(&inspect/1) |> Enum.join(",")



        result = unquote(body[:do])



        loc = "#{file}(line #{line})"

        call = "#{module}.#{function_name}(#{passed_args}) = #{inspect result}"

        IO.puts "#{loc} #{call}"



        result

      end

    end

  end



  defp name_and_args({:when, _, [short_head | _]}) do

    name_and_args(short_head)

  end



  defp name_and_args(short_head) do

    Macro.decompose_call(short_head)

  end



  defp decorate_args([]), do: {[],[]}

  defp decorate_args(args_ast) do

    for {arg_ast, index} <- Enum.with_index(args_ast) do

      # dynamically generate quoted identifier

      arg_name = Macro.var(:"arg#{index}", __MODULE__)



      # generate AST for patternX = argX

      full_arg = quote do

        unquote(arg_ast) = unquote(arg_name)

      end



      {arg_name, full_arg}

    end

  end

end



# SPDX-License-Identifier: Apache-2.0