Add 'Render ... Markdown blocks' option to published apps

lib/livebook/notebook/app_settings.ex

@@ -14,7 +14,8 @@ defmodule Livebook.Notebook.AppSettings do
           access_type: access_type(),
           password: String.t() | nil,
           show_source: boolean(),
-          output_type: output_type()
+          output_type: output_type(),
+          render_static: boolean()
         }
 
   @type access_type :: :public | :protected
@@ -33,6 +34,7 @@ defmodule Livebook.Notebook.AppSettings do
     field :password, :string
     field :show_source, :boolean
     field :output_type, Ecto.Enum, values: [:all, :rich]
+    field :render_static, :boolean
   end
 
   @doc """
@@ -49,7 +51,8 @@ defmodule Livebook.Notebook.AppSettings do
       access_type: :protected,
       password: generate_password(),
       show_source: false,
-      output_type: :all
+      output_type: :all,
+      render_static: false
     }
   end
 
@@ -82,14 +85,16 @@ defmodule Livebook.Notebook.AppSettings do
       :auto_shutdown_ms,
       :access_type,
       :show_source,
-      :output_type
+      :output_type,
+      :render_static
     ])
     |> validate_required([
       :slug,
       :multi_session,
       :access_type,
       :show_source,
-      :output_type
+      :output_type,
+      :render_static
     ])
     |> validate_format(:slug, ~r/^[a-z0-9-]+$/,
       message: "should only contain lowercase alphanumeric characters and dashes"

lib/livebook/notebook/cell.ex

@@ -49,6 +49,13 @@ defmodule Livebook.Notebook.Cell do
   def evaluable?(%Cell.Smart{}), do: true
   def evaluable?(_cell), do: false
 
+  @doc """
+  Checks if the given cell can be statically rendered
+  """
+  @spec static?(t()) :: boolean()
+  def static?(%Cell.Markdown{}), do: true
+  def static?(_), do: false
+
   @doc """
   Extracts all inputs from the given indexed output.
   """

lib/livebook_web/live/app_session_live.ex

@@ -442,17 +442,42 @@ defmodule LivebookWeb.AppSessionLive do
   defp data_to_view(data) do
     changed_input_ids = Session.Data.changed_input_ids(data)
 
-    %{
-      notebook_name: data.notebook.name,
-      cell_views:
-        for {cell, _section} <- Notebook.evaluable_cells_with_section(data.notebook) do
+    shall_render = fn cell ->
+      if data.notebook.app_settings.render_static do
+        Cell.evaluable?(cell) or Cell.static?(cell)
+      else
+        Cell.evaluable?(cell)
+      end
+    end
+
+    cell_views =
+      data.notebook
+      |> Notebook.cells_with_section()
+      |> Enum.filter(fn {cell, _section} -> shall_render.(cell) end)
+      |> Enum.map(fn
+        {%Livebook.Notebook.Cell.Markdown{} = cell, _section} ->
+          out_id = :rand.uniform(31337)
+          output = {out_id, %{type: :markdown_static, text: cell.source, chunk: false}}
+
+          %{
+            id: cell.id,
+            input_views: [],
+            outputs: [output],
+            outputs_batch_number: 0
+          }
+
+        {cell, _section} ->
           %{
             id: cell.id,
             input_views: input_views_for_cell(cell, data, changed_input_ids),
             outputs: filter_outputs(cell.outputs, data.notebook.app_settings.output_type),
             outputs_batch_number: data.cell_infos[cell.id].eval.outputs_batch_number
           }
-        end,
+      end)
+
+    %{
+      notebook_name: data.notebook.name,
+      cell_views: cell_views,
       app_status: data.app_data.status,
       show_source: data.notebook.app_settings.show_source,
       slug: data.notebook.app_settings.slug,

lib/livebook_web/live/output.ex

@@ -64,6 +64,19 @@ defmodule LivebookWeb.Output do
     """
   end
 
+  defp render_output(%{type: :markdown_static} = output, %{id: id, session_id: session_id}) do
+    assigns = %{id: id, session_id: session_id, output: output}
+
+    ~H"""
+    <.live_component
+      module={Output.MarkdownStaticComponent}
+      id={@id}
+      session_id={@session_id}
+      output={@output}
+    />
+    """
+  end
+
   defp render_output(%{type: :image} = output, %{id: id}) do
     assigns = %{id: id, content: output.content, mime_type: output.mime_type}
 

lib/livebook_web/live/output/markdown_static_component.ex

@@ -0,0 +1,12 @@
+defmodule LivebookWeb.Output.MarkdownStaticComponent do
+  use LivebookWeb, :live_component
+
+  @impl true
+  def render(assigns) do
+    ~H"""
+    <div>{to_html(@output.text)}</div>
+    """
+  end
+
+  defp to_html(markdown), do: Earmark.as_html!(markdown) |> Phoenix.HTML.raw()
+end

lib/livebook_web/live/session_live/app_settings_component.ex

@@ -105,6 +105,17 @@ defmodule LivebookWeb.SessionLive.AppSettingsComponent do
               '''
             }
           />
+          <.checkbox_field
+            field={f[:render_static]}
+            label="Render sections and Markdown blocks"
+            help={
+              ~S'''
+              When enabled, renders all the added
+              h2-sections and Markdown blocks of
+              the original notebook.
+              '''
+            }
+          />
           <%= if Ecto.Changeset.get_field(@changeset, :multi_session) do %>
             <.checkbox_field
               field={f[:show_existing_sessions]}

mix.exs

@@ -114,7 +114,7 @@ defmodule Livebook.MixProject do
       {:bandit, "~> 1.0"},
       {:plug, "~> 1.16"},
       {:plug_crypto, "~> 2.0"},
-      {:earmark_parser, "~> 1.4"},
+      {:earmark, "~> 1.4"},
       {:ecto, "~> 3.10"},
       {:phoenix_ecto, "~> 4.4"},
       {:aws_credentials, "~> 0.3.0", runtime: false},

mix.lock

@@ -9,6 +9,7 @@
   "cowlib": {:hex, :cowlib, "2.13.0", "db8f7505d8332d98ef50a3ef34b34c1afddec7506e4ee4dd4a3a266285d282ca", [:make, :rebar3], [], "hexpm", "e1e1284dc3fc030a64b1ad0d8382ae7e99da46c3246b815318a4b848873800a4"},
   "decimal": {:hex, :decimal, "2.1.1", "5611dca5d4b2c3dd497dec8f68751f1f1a54755e8ed2a966c2633cf885973ad6", [:mix], [], "hexpm", "53cfe5f497ed0e7771ae1a475575603d77425099ba5faef9394932b35020ffcc"},
   "dns_cluster": {:hex, :dns_cluster, "0.1.3", "0bc20a2c88ed6cc494f2964075c359f8c2d00e1bf25518a6a6c7fd277c9b0c66", [:mix], [], "hexpm", "46cb7c4a1b3e52c7ad4cbe33ca5079fbde4840dedeafca2baf77996c2da1bc33"},
+  "earmark": {:hex, :earmark, "1.4.47", "7e7596b84fe4ebeb8751e14cbaeaf4d7a0237708f2ce43630cfd9065551f94ca", [:mix], [], "hexpm", "3e96bebea2c2d95f3b346a7ff22285bc68a99fbabdad9b655aa9c6be06c698f8"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.43", "34b2f401fe473080e39ff2b90feb8ddfeef7639f8ee0bbf71bb41911831d77c5", [:mix], [], "hexpm", "970a3cd19503f5e8e527a190662be2cee5d98eed1ff72ed9b3d1a3d466692de8"},
   "ecto": {:hex, :ecto, "3.12.5", "4a312960ce612e17337e7cefcf9be45b95a3be6b36b6f94dfb3d8c361d631866", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "6eb18e80bef8bb57e17f5a7f068a1719fbda384d40fc37acb8eb8aeca493b6ea"},
   "eini": {:hex, :eini_beam, "2.2.4", "02143b1dce4dda4243248e7d9b3d8274b8d9f5a666445e3d868e2cce79e4ff22", [:rebar3], [], "hexpm", "12de479d144b19e09bb92ba202a7ea716739929afdf9dff01ad802e2b1508471"},