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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Retired package: Deprecated - Earmark is no longer maintained.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).
Security advisory: This version has known vulnerabilities. View advisories
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earmark lib earmark_parser enum ext.ex
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lib/earmark_parser/enum/ext.ex 

defmodule Earmark.Parser.Enum.Ext do

  @moduledoc ~S"""

    Some extensions of Enum functions

  """



  @doc ~S"""

  `reduce_with_end` is like `Enum.reduce` for lists, but the reducer function is called for

  each element of the list with the tuple `{:element, element}` and the accumulator and once

  more at the end with `:end` and the accumulator



      iex(1)> reducer =

      ...(1)>   fn {:element, nil}, {partial, result} -> {[], [Enum.sum(partial)|result]}

      ...(1)>      {:element, val}, {partial, result} -> {[val|partial], result}

      ...(1)>      :end,            {partial, result} -> [Enum.sum(partial)|result] |> Enum.reverse

      ...(1)>   end

      ...(1)> [1, 2, nil, 4, 1, 0, nil, 3, 2, 2]

      ...(1)> |> reduce_with_end({[], []}, reducer)

      [3, 5, 7]



  **N.B.** that in the treatment of `:end` we can change the shape of the accumulator w/o any

  penalty concerning the complexity of the reducer function

  """

  def reduce_with_end(collection, initial_acc, reducer_fn)

  def reduce_with_end([], acc, reducer_fn) do

    reducer_fn.(:end, acc)

  end

  def reduce_with_end([ele|rest], acc, reducer_fn) do

    reduce_with_end(rest, reducer_fn.({:element, ele}, acc), reducer_fn)

  end



  @doc ~S"""



    Like map_reduce but reversing the list



      iex(2)> replace_nil_and_count = fn ele, acc ->

      ...(2)>   if ele, do: {ele, acc}, else: {"", acc + 1}

      ...(2)> end

      ...(2)> ["y", nil, "u", nil, nil, "a", nil] |> reverse_map_reduce(0, replace_nil_and_count)

      { ["", "a", "", "", "u", "", "y"], 4 }



  """

  def reverse_map_reduce(list, initial, fun) do

    _reverse_map_reduce(list, initial, [], fun)

  end



  # Helpers {{{

  defp _reverse_map_reduce(list, acc, result, fun)

  defp _reverse_map_reduce([], acc, result, _fun), do: {result, acc}

  defp _reverse_map_reduce([fst|rst], acc, result, fun) do

    {new_ele, new_acc} = fun.(fst, acc)

    _reverse_map_reduce(rst, new_acc, [new_ele|result], fun)

  end

  # }}}

end

#  SPDX-License-Identifier: Apache-2.0