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earmark

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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Retired package: Deprecated - Earmark is no longer maintained.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 earmark helpers.ex
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lib/earmark/helpers.ex 

defmodule Earmark.Helpers do



  @doc """

  Expand tabs to multiples of 4 columns

  """

  def expand_tabs(line) do

    Regex.replace(~r{(.*?)\t}, line, &expander/2)

  end



  defp expander(_, leader) do

    extra = 4 - rem(String.length(leader), 4)

    leader <> pad(extra)

  end



  @doc """

  Remove newlines at end of line

  """

  def remove_line_ending(line) do

    line |> String.rstrip(?\n) |> String.rstrip(?\r)

  end



  defp pad(1), do: " "

  defp pad(2), do: "  "

  defp pad(3), do: "   "

  defp pad(4), do: "    "



  @doc """

  `Regex.replace` with the arguments in the correct order

  """



  def replace(text, regex, replacement, options \\ []) do

    Regex.replace(regex, text, replacement, options)

  end



  @doc """

  Encode URIs to be included in the `<a>` elements.



  Percent-escapes a URI, and after that escapes any

  `&`, `<`, `>`, `"`, `'`.

  """

  def encode(html) do

    URI.encode(html) |> escape(true)

  end



  @doc """

  Replace <, >, and quotes with the corresponding entities. If

  `encode` is true, convert ampersands, too, otherwise only

   convert non-entity ampersands.

  """



  def escape(html, encode \\ false)



  def escape(html, false), do: _escape(Regex.replace(~r{&(?!#?\w+;)}, html, "&amp;"))

  def escape(html, _), do: _escape(String.replace(html, "&", "&amp;"))



  defp _escape(html) do

    html

    |> String.replace("<",  "&lt;")

    |> String.replace(">",  "&gt;")

    |> String.replace("\"", "&quot;")

    |> String.replace("'",  "&#39;")

  end





  @doc """

  Formats an error message and puts it to stderr

  """

  def emit_error filename, %{lnb: lnb}, error_type, error_message do

    emit_error filename, lnb, error_type, error_message

  end

  def emit_error filename, lnb, error_type, error_message do

    IO.puts(:stderr, "#{filename}:#{lnb}: #{error_type}: #{error_message}")

  end

end