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Fast and extensible Markdown for Elixir

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mdex examples live_view.exs
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examples/live_view.exs 

Mix.install([

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

  {:phoenix_live_view, "~> 0.20"},

  {:phoenix_playground, "~> 0.1"}

])



defmodule MDEx.LiveView do

  # unescape HTML entities

  # https://github.com/sasa1977/erlangelist/blob/c5ddea9180732e56095b1a20b930dd5f686a62c0/site/lib/erlangelist/web/blog/code_highlighter.ex#L48-L62

  entities = [{"&amp;", ?&}, {"&lt;", ?<}, {"&gt;", ?>}, {"&quot;", ?"}, {"&#39;", ?'}]



  for {encoded, decoded} <- entities do

    def unescape_html(unquote(encoded) <> rest) do

      [unquote(decoded) | unescape_html(rest)]

    end

  end



  def unescape_html(<<c, rest::binary>>) do

    [c | unescape_html(rest)]

  end



  def unescape_html(<<>>) do

    []

  end



  # https://github.com/phoenixframework/phoenix_live_view/blob/1b1c9bc5e24fbb01dad24ce29279f852cf0ae6f6/lib/phoenix_component.ex#L791

  defmacro sigil_M({:<<>>, meta, [expr]}, []) do

    unless Macro.Env.has_var?(__CALLER__, {:assigns, nil}) do

      raise "~M requires a variable named \"assigns\" to exist and be set to a map"

    end



    md =

      expr

      # manipulate MDEx options here

      |> MDEx.to_html!()

      |> MDEx.LiveView.unescape_html()

      |> IO.iodata_to_binary()



    options = [

      engine: Phoenix.LiveView.TagEngine,

      file: __CALLER__.file,

      line: __CALLER__.line + 1,

      caller: __CALLER__,

      indentation: meta[:indentation] || 0,

      source: md,

      tag_handler: Phoenix.LiveView.HTMLEngine

    ]



    EEx.compile_string(md, options)

  end

end



defmodule DemoLive do

  use Phoenix.LiveView

  use Phoenix.Component

  import MDEx.LiveView



  def mount(_params, _session, socket) do

    {:ok, assign(socket, path: "/?hello=world")}

  end



  def handle_params(_params, uri, socket) do

    IO.puts("Received a patch request to #{uri}")

    {:noreply, socket}

  end



  def render(assigns) do

    ~M"""

    # Phoenix LiveView Example



    Convert this markdown into a [Phoenix.LiveView.Rendered](https://hexdocs.pm/phoenix_live_view/Phoenix.LiveView.Rendered.html) struct.



    ## Examples



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



    * `.link` with an @assign in `:patch` (see console logs) -  <.link patch={@path}>link to @path</.link>

    """

  end

end



PhoenixPlayground.start(live: DemoLive)