#16 first approach of the exporter: mix prexent.export task

fiqus · Nov 10, 2019 · 2f19cef · 2f19cef
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diff --git a/.gitignore b/.gitignore
@@ -37,4 +37,6 @@ npm-debug.log
 .elixir_ls
 
 *.iml
-.idea
+.idea
+
+/exported/
diff --git a/lib/mix/tasks/prexent_export.ex b/lib/mix/tasks/prexent_export.ex
@@ -0,0 +1,55 @@
+defmodule Mix.Tasks.Prexent.Export do
+  @moduledoc """
+  Run the Phoenix server with the endpoints defined by Prexent.
+
+  Execute `mix prexent` in your prexent project.
+
+  The default markdown file is `slides.md`, if you want to use another source file, run:
+
+      $ mix prexent FILE_NAME
+
+  The source markdown file is set in `Application.put_env(:prexent, :source_md, source_md)` to be consumed by the live view endpoint.
+
+  The default port is 4000, you can change it passing the `PORT` env:
+
+      $ PORT=4040 mix prexent
+
+  """
+  use Mix.Task
+
+  @doc false
+  def run(args) do
+    source_md = get_source_name(args)
+    check_file!(source_md)
+    Mix.shell.info "Exporting to static presentation at 'exported/'.."
+    File.mkdir_p!("exported")
+    html = generate(source_md)
+    File.cd!("exported")
+    File.write!("index.html", html)
+    # copy static files
+    File.copy!("../priv/static/js/app.js", "app.js")
+    File.copy!("../priv/static/css/app.css", "app.css")
+  end
+
+  def generate(source_md) do
+    slides = Prexent.Parser.to_parsed_list(source_md)
+
+    assigns = %{
+      layout: {PrexentWeb.LayoutView, "export.html"},
+      slides: slides,
+      slide: 0,
+      code_runners: %{},
+      pid_slides: %{}
+    }
+
+    Phoenix.View.render_to_string(PrexentWeb.SlidesView, "slides.html", assigns)
+  end
+
+  defp get_source_name([]), do: "slides.md"
+  defp get_source_name(args), do: hd(args)
+
+  defp check_file!(filename) do
+    if not File.exists?(filename),
+      do: Mix.raise("The slides source file '#{filename}' does not exist")
+  end
+end
diff --git a/lib/prexent_web/templates/layout/export.html.eex b/lib/prexent_web/templates/layout/export.html.eex
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8"/>
+    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+    <title>Prexent</title>
+    <link href="https://fonts.googleapis.com/css?family=Open+Sans:600,700|Roboto|Roboto+Mono:400,400i&display=swap" rel="stylesheet">
+    <link rel="stylesheet" href="app.css"/>
+  </head>
+  <body>
+    <main>
+      <%= render @view_module, @view_template, assigns %>
+    </main>
+    <script type="text/javascript" src="app.js"></script>
+  </body>
+</html>