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Fast and extensible Markdown for Elixir

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mdex examples heex.exs
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examples/heex.exs 

Mix.install([

  {:mdex, path: ".."},

  {:phoenix_live_view, "~> 1.0"},

  {:html_entities, "~> 0.5"}

])



defmodule MDEx.HEEx do

  # unescape all but <pre> tags

  # MDEx eventually should mark which tags must be preserved

  # instead of trying to guess it, but it works

  # for a simple example or for simple use cases

  defp unescape(html) do

    ~r/(<pre.*?<\/pre>)/s

    |> Regex.split(html, include_captures: true)

    |> Enum.map(fn part ->

      if String.starts_with?(part, "<pre") do

        part

      else

        HtmlEntities.decode(part)

      end

    end)

    |> Enum.join()

    |> IO.iodata_to_binary()

  end



  def to_html!(markdown, assigns \\ %{}) do

    opts = [

      extension: [

        strikethrough: true,

        tagfilter: true,

        table: true,

        tasklist: true,

        footnotes: true,

        shortcodes: true

      ],

      parse: [

        relaxed_tasklist_matching: true

      ],

      render: [

        unsafe_: true

      ]

    ]



    markdown

    |> MDEx.to_html!(opts)

    |> unescape()

    |> render_heex!(assigns)

  end



  defp render_heex!(html, assigns) do

    env = env()



    opts = [

      source: html,

      engine: Phoenix.LiveView.TagEngine,

      tag_handler: Phoenix.LiveView.HTMLEngine,

      file: "nofile",

      caller: env,

      line: 1,

      indentation: 0

    ]



    {rendered, _} =

      html

      |> EEx.compile_string(opts)

      |> Code.eval_quoted([assigns: assigns], env)



    rendered

    |> Phoenix.HTML.Safe.to_iodata()

    |> IO.iodata_to_binary()

  end



  defp env do

    import Phoenix.Component, warn: false

    __ENV__

  end

end



markdown = """

# Phoenix HEEx Example



## Examples



`@path = <%= @path %>`



* `.link` with `:href` expression - <.link href={URI.parse("https://elixir-lang.org")}>link to elixir-lang.org</.link>

* `.link` with an @assign - <.link href={@path}>link to @path</.link>



```php

<?php echo 'Hello, World!'; ?>

```



```heex

<%= @hello %>

{ @hello }

```



Elixir was created by José Valim.

"""



html = MDEx.HEEx.to_html!(markdown, %{path: "https://elixir-lang.org"})

File.write!("heex.html", html)

IO.puts(html)