Initial commit

.formatter.exs

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+[
+  import_deps: [:phoenix],
+  inputs: ["*.{ex,exs}", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where 3rd-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+live_book-*.tar
+
+# If NPM crashes, it generates a log, let's ignore it too.
+npm-debug.log
+
+# The directory NPM downloads your dependencies sources to.
+/assets/node_modules/
+
+# Since we are building assets from assets/,
+# we ignore priv/static. You may want to comment
+# this depending on your deployment strategy.
+/priv/static/

README.md

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+# LiveBook
+
+To start your Phoenix server:
+
+  * Install dependencies with `mix deps.get`
+  * Install Node.js dependencies with `npm install` inside the `assets` directory
+  * Start Phoenix endpoint with `mix phx.server`
+
+Now you can visit [`localhost:4000`](http://localhost:4000) from your browser.
+
+Ready to run in production? Please [check our deployment guides](https://hexdocs.pm/phoenix/deployment.html).
+
+## Learn more
+
+  * Official website: https://www.phoenixframework.org/
+  * Guides: https://hexdocs.pm/phoenix/overview.html
+  * Docs: https://hexdocs.pm/phoenix
+  * Forum: https://elixirforum.com/c/phoenix-forum
+  * Source: https://github.com/phoenixframework/phoenix

assets/.babelrc

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+{
+    "presets": [
+        "@babel/preset-env"
+    ]
+}

assets/css/app.scss

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+/* This file is for your main application css. */
+@import "./phoenix.css";
+
+/* Alerts and form errors */
+.alert {
+  padding: 15px;
+  margin-bottom: 20px;
+  border: 1px solid transparent;
+  border-radius: 4px;
+}
+.alert-info {
+  color: #31708f;
+  background-color: #d9edf7;
+  border-color: #bce8f1;
+}
+.alert-warning {
+  color: #8a6d3b;
+  background-color: #fcf8e3;
+  border-color: #faebcc;
+}
+.alert-danger {
+  color: #a94442;
+  background-color: #f2dede;
+  border-color: #ebccd1;
+}
+.alert p {
+  margin-bottom: 0;
+}
+.alert:empty {
+  display: none;
+}
+.invalid-feedback {
+  color: #a94442;
+  display: block;
+  margin: -1rem 0 2rem;
+}

assets/js/app.js

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+// We need to import the CSS so that webpack will load it.
+// The MiniCssExtractPlugin is used to separate it out into
+// its own CSS file.
+import "../css/app.scss"
+
+// webpack automatically bundles all modules in your
+// entry points. Those entry points can be configured
+// in "webpack.config.js".
+//
+// Import deps with the dep name or local files with a relative path, for example:
+//
+//     import {Socket} from "phoenix"
+//     import socket from "./socket"
+//
+import "phoenix_html"

assets/js/socket.js

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+// NOTE: The contents of this file will only be executed if
+// you uncomment its entry in "assets/js/app.js".
+
+// To use Phoenix channels, the first step is to import Socket,
+// and connect at the socket path in "lib/web/endpoint.ex".
+//
+// Pass the token on params as below. Or remove it
+// from the params if you are not using authentication.
+import {Socket} from "phoenix"
+
+let socket = new Socket("/socket", {params: {token: window.userToken}})
+
+// When you connect, you'll often need to authenticate the client.
+// For example, imagine you have an authentication plug, `MyAuth`,
+// which authenticates the session and assigns a `:current_user`.
+// If the current user exists you can assign the user's token in
+// the connection for use in the layout.
+//
+// In your "lib/web/router.ex":
+//
+//     pipeline :browser do
+//       ...
+//       plug MyAuth
+//       plug :put_user_token
+//     end
+//
+//     defp put_user_token(conn, _) do
+//       if current_user = conn.assigns[:current_user] do
+//         token = Phoenix.Token.sign(conn, "user socket", current_user.id)
+//         assign(conn, :user_token, token)
+//       else
+//         conn
+//       end
+//     end
+//
+// Now you need to pass this token to JavaScript. You can do so
+// inside a script tag in "lib/web/templates/layout/app.html.eex":
+//
+//     <script>window.userToken = "<%= assigns[:user_token] %>";</script>
+//
+// You will need to verify the user token in the "connect/3" function
+// in "lib/web/channels/user_socket.ex":
+//
+//     def connect(%{"token" => token}, socket, _connect_info) do
+//       # max_age: 1209600 is equivalent to two weeks in seconds
+//       case Phoenix.Token.verify(socket, "user socket", token, max_age: 1209600) do
+//         {:ok, user_id} ->
+//           {:ok, assign(socket, :user, user_id)}
+//         {:error, reason} ->
+//           :error
+//       end
+//     end
+//
+// Finally, connect to the socket:
+socket.connect()
+
+// Now that you are connected, you can join channels with a topic:
+let channel = socket.channel("topic:subtopic", {})
+channel.join()
+  .receive("ok", resp => { console.log("Joined successfully", resp) })
+  .receive("error", resp => { console.log("Unable to join", resp) })
+
+export default socket

assets/package.json

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+{
+  "repository": {},
+  "description": " ",
+  "license": "MIT",
+  "scripts": {
+    "deploy": "webpack --mode production",
+    "watch": "webpack --mode development --watch"
+  },
+  "dependencies": {
+    "phoenix": "file:../deps/phoenix",
+    "phoenix_html": "file:../deps/phoenix_html"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "babel-loader": "^8.0.0",
+    "copy-webpack-plugin": "^5.1.1",
+    "css-loader": "^3.4.2",
+    "sass-loader": "^8.0.2",
+    "node-sass": "^4.13.1",
+    "hard-source-webpack-plugin": "^0.13.1",
+    "mini-css-extract-plugin": "^0.9.0",
+    "optimize-css-assets-webpack-plugin": "^5.0.1",
+    "terser-webpack-plugin": "^2.3.2",
+    "webpack": "4.41.5",
+    "webpack-cli": "^3.3.2"
+  }
+}

assets/static/robots.txt

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+# See http://www.robotstxt.org/robotstxt.html for documentation on how to use the robots.txt file
+#
+# To ban all spiders from the entire site uncomment the next two lines:
+# User-agent: *
+# Disallow: /

assets/webpack.config.js

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+const path = require('path');
+const glob = require('glob');
+const HardSourceWebpackPlugin = require('hard-source-webpack-plugin');
+const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+const TerserPlugin = require('terser-webpack-plugin');
+const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
+const CopyWebpackPlugin = require('copy-webpack-plugin');
+
+module.exports = (env, options) => {
+  const devMode = options.mode !== 'production';
+
+  return {
+    optimization: {
+      minimizer: [
+        new TerserPlugin({ cache: true, parallel: true, sourceMap: devMode }),
+        new OptimizeCSSAssetsPlugin({})
+      ]
+    },
+    entry: {
+      'app': glob.sync('./vendor/**/*.js').concat(['./js/app.js'])
+    },
+    output: {
+      filename: '[name].js',
+      path: path.resolve(__dirname, '../priv/static/js'),
+      publicPath: '/js/'
+    },
+    devtool: devMode ? 'eval-cheap-module-source-map' : undefined,
+    module: {
+      rules: [
+        {
+          test: /\.js$/,
+          exclude: /node_modules/,
+          use: {
+            loader: 'babel-loader'
+          }
+        },
+        {
+          test: /\.[s]?css$/,
+          use: [
+            MiniCssExtractPlugin.loader,
+            'css-loader',
+            'sass-loader',
+          ],
+        }
+      ]
+    },
+    plugins: [
+      new MiniCssExtractPlugin({ filename: '../css/app.css' }),
+      new CopyWebpackPlugin([{ from: 'static/', to: '../' }])
+    ]
+    .concat(devMode ? [new HardSourceWebpackPlugin()] : [])
+  }
+};

config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+#
+# This configuration file is loaded before any dependency and
+# is restricted to this project.
+
+# General application configuration
+use Mix.Config
+
+# Configures the endpoint
+config :live_book, LiveBookWeb.Endpoint,
+  url: [host: "localhost"],
+  secret_key_base: "xDSK5nu5cynBegaOd+XedDm30Z4iuRnesn/x0MRAv6uxFx+NYiFTNU1gpfq4IkQE",
+  render_errors: [view: LiveBookWeb.ErrorView, accepts: ~w(html json), layout: false],
+  pubsub_server: LiveBook.PubSub,
+  live_view: [signing_salt: "1Z+NpfzU"]
+
+# Configures Elixir's Logger
+config :logger, :console,
+  format: "$time $metadata[$level] $message\n",
+  metadata: [:request_id]
+
+# Use Jason for JSON parsing in Phoenix
+config :phoenix, :json_library, Jason
+
+# Import environment specific config. This must remain at the bottom
+# of this file so it overrides the configuration defined above.
+import_config "#{Mix.env()}.exs"

config/dev.exs

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+use Mix.Config
+
+# For development, we disable any cache and enable
+# debugging and code reloading.
+#
+# The watchers configuration can be used to run external
+# watchers to your application. For example, we use it
+# with webpack to recompile .js and .css sources.
+config :live_book, LiveBookWeb.Endpoint,
+  http: [port: 4000],
+  debug_errors: true,
+  code_reloader: true,
+  check_origin: false,
+  watchers: [
+    node: [
+      "node_modules/webpack/bin/webpack.js",
+      "--mode",
+      "development",
+      "--watch-stdin",
+      cd: Path.expand("../assets", __DIR__)
+    ]
+  ]
+
+# ## SSL Support
+#
+# In order to use HTTPS in development, a self-signed
+# certificate can be generated by running the following
+# Mix task:
+#
+#     mix phx.gen.cert
+#
+# Note that this task requires Erlang/OTP 20 or later.
+# Run `mix help phx.gen.cert` for more information.
+#
+# The `http:` config above can be replaced with:
+#
+#     https: [
+#       port: 4001,
+#       cipher_suite: :strong,
+#       keyfile: "priv/cert/selfsigned_key.pem",
+#       certfile: "priv/cert/selfsigned.pem"
+#     ],
+#
+# If desired, both `http:` and `https:` keys can be
+# configured to run both http and https servers on
+# different ports.
+
+# Watch static and templates for browser reloading.
+config :live_book, LiveBookWeb.Endpoint,
+  live_reload: [
+    patterns: [
+      ~r"priv/static/.*(js|css|png|jpeg|jpg|gif|svg)$",
+      ~r"lib/live_book_web/(live|views)/.*(ex)$",
+      ~r"lib/live_book_web/templates/.*(eex)$"
+    ]
+  ]
+
+# Do not include metadata nor timestamps in development logs
+config :logger, :console, format: "[$level] $message\n"
+
+# Set a higher stacktrace during development. Avoid configuring such
+# in production as building large stacktraces may be expensive.
+config :phoenix, :stacktrace_depth, 20
+
+# Initialize plugs at runtime for faster development compilation
+config :phoenix, :plug_init_mode, :runtime

config/prod.exs

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+use Mix.Config
+
+# For production, don't forget to configure the url host
+# to something meaningful, Phoenix uses this information
+# when generating URLs.
+#
+# Note we also include the path to a cache manifest
+# containing the digested version of static files. This
+# manifest is generated by the `mix phx.digest` task,
+# which you should run after static files are built and
+# before starting your production server.
+config :live_book, LiveBookWeb.Endpoint,
+  url: [host: "example.com", port: 80],
+  cache_static_manifest: "priv/static/cache_manifest.json"
+
+# Do not print debug messages in production
+config :logger, level: :info
+
+# ## SSL Support
+#
+# To get SSL working, you will need to add the `https` key
+# to the previous section and set your `:url` port to 443:
+#
+#     config :live_book, LiveBookWeb.Endpoint,
+#       ...
+#       url: [host: "example.com", port: 443],
+#       https: [
+#         port: 443,
+#         cipher_suite: :strong,
+#         keyfile: System.get_env("SOME_APP_SSL_KEY_PATH"),
+#         certfile: System.get_env("SOME_APP_SSL_CERT_PATH"),
+#         transport_options: [socket_opts: [:inet6]]
+#       ]
+#
+# The `cipher_suite` is set to `:strong` to support only the
+# latest and more secure SSL ciphers. This means old browsers
+# and clients may not be supported. You can set it to
+# `:compatible` for wider support.
+#
+# `:keyfile` and `:certfile` expect an absolute path to the key
+# and cert in disk or a relative path inside priv, for example
+# "priv/ssl/server.key". For all supported SSL configuration
+# options, see https://hexdocs.pm/plug/Plug.SSL.html#configure/1
+#
+# We also recommend setting `force_ssl` in your endpoint, ensuring
+# no data is ever sent via http, always redirecting to https:
+#
+#     config :live_book, LiveBookWeb.Endpoint,
+#       force_ssl: [hsts: true]
+#
+# Check `Plug.SSL` for all available options in `force_ssl`.
+
+# Finally import the config/prod.secret.exs which loads secrets
+# and configuration from environment variables.
+import_config "prod.secret.exs"

config/prod.secret.exs

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+# In this file, we load production configuration and secrets
+# from environment variables. You can also hardcode secrets,
+# although such is generally not recommended and you have to
+# remember to add this file to your .gitignore.
+use Mix.Config
+
+secret_key_base =
+  System.get_env("SECRET_KEY_BASE") ||
+    raise """
+    environment variable SECRET_KEY_BASE is missing.
+    You can generate one by calling: mix phx.gen.secret
+    """
+
+config :live_book, LiveBookWeb.Endpoint,
+  http: [
+    port: String.to_integer(System.get_env("PORT") || "4000"),
+    transport_options: [socket_opts: [:inet6]]
+  ],
+  secret_key_base: secret_key_base
+
+# ## Using releases (Elixir v1.9+)
+#
+# If you are doing OTP releases, you need to instruct Phoenix
+# to start each relevant endpoint:
+#
+#     config :live_book, LiveBookWeb.Endpoint, server: true
+#
+# Then you can assemble a release by calling `mix release`.
+# See `mix help release` for more information.

config/test.exs

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+use Mix.Config
+
+# We don't run a server during test. If one is required,
+# you can enable the server option below.
+config :live_book, LiveBookWeb.Endpoint,
+  http: [port: 4002],
+  server: false
+
+# Print only warnings and errors during test
+config :logger, level: :warn

lib/live_book.ex

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+defmodule LiveBook do
+  @moduledoc """
+  LiveBook keeps the contexts that define your domain
+  and business logic.
+
+  Contexts are also responsible for managing your data, regardless
+  if it comes from the database, an external API or others.
+  """
+end

lib/live_book/application.ex

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+defmodule LiveBook.Application do
+  # See https://hexdocs.pm/elixir/Application.html
+  # for more information on OTP Applications
+  @moduledoc false
+
+  use Application
+
+  def start(_type, _args) do
+    children = [
+      # Start the Telemetry supervisor
+      LiveBookWeb.Telemetry,
+      # Start the PubSub system
+      {Phoenix.PubSub, name: LiveBook.PubSub},
+      # Start the Endpoint (http/https)
+      LiveBookWeb.Endpoint
+      # Start a worker by calling: LiveBook.Worker.start_link(arg)
+      # {LiveBook.Worker, arg}
+    ]
+
+    # See https://hexdocs.pm/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: LiveBook.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+
+  # Tell Phoenix to update the endpoint configuration
+  # whenever the application is updated.
+  def config_change(changed, _new, removed) do
+    LiveBookWeb.Endpoint.config_change(changed, removed)
+    :ok
+  end
+end

lib/live_book_web.ex

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+defmodule LiveBookWeb do
+  @moduledoc """
+  The entrypoint for defining your web interface, such
+  as controllers, views, channels and so on.
+
+  This can be used in your application as:
+
+      use LiveBookWeb, :controller
+      use LiveBookWeb, :view
+
+  The definitions below will be executed for every view,
+  controller, etc, so keep them short and clean, focused
+  on imports, uses and aliases.
+
+  Do NOT define functions inside the quoted expressions
+  below. Instead, define any helper function in modules
+  and import those modules here.
+  """
+
+  def controller do
+    quote do
+      use Phoenix.Controller, namespace: LiveBookWeb
+
+      import Plug.Conn
+      alias LiveBookWeb.Router.Helpers, as: Routes
+    end
+  end
+
+  def view do
+    quote do
+      use Phoenix.View,
+        root: "lib/live_book_web/templates",
+        namespace: LiveBookWeb
+
+      # Import convenience functions from controllers
+      import Phoenix.Controller,
+        only: [get_flash: 1, get_flash: 2, view_module: 1, view_template: 1]
+
+      # Include shared imports and aliases for views
+      unquote(view_helpers())
+    end
+  end
+
+  def router do
+    quote do
+      use Phoenix.Router
+
+      import Plug.Conn
+      import Phoenix.Controller
+    end
+  end
+
+  def channel do
+    quote do
+      use Phoenix.Channel
+    end
+  end
+
+  defp view_helpers do
+    quote do
+      # Use all HTML functionality (forms, tags, etc)
+      use Phoenix.HTML
+
+      # Import basic rendering functionality (render, render_layout, etc)
+      import Phoenix.View
+
+      import LiveBookWeb.ErrorHelpers
+      alias LiveBookWeb.Router.Helpers, as: Routes
+    end
+  end
+
+  @doc """
+  When used, dispatch to the appropriate controller/view/etc.
+  """
+  defmacro __using__(which) when is_atom(which) do
+    apply(__MODULE__, which, [])
+  end
+end

lib/live_book_web/controllers/page_controller.ex

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+defmodule LiveBookWeb.PageController do
+  use LiveBookWeb, :controller
+
+  def index(conn, _params) do
+    render(conn, "index.html")
+  end
+end

lib/live_book_web/endpoint.ex

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+defmodule LiveBookWeb.Endpoint do
+  use Phoenix.Endpoint, otp_app: :live_book
+
+  # The session will be stored in the cookie and signed,
+  # this means its contents can be read but not tampered with.
+  # Set :encryption_salt if you would also like to encrypt it.
+  @session_options [
+    store: :cookie,
+    key: "_live_book_key",
+    signing_salt: "LZr3S4e9"
+  ]
+
+  # Serve at "/" the static files from "priv/static" directory.
+  #
+  # You should set gzip to true if you are running phx.digest
+  # when deploying your static files in production.
+  plug Plug.Static,
+    at: "/",
+    from: :live_book,
+    gzip: false,
+    only: ~w(css fonts images js favicon.ico robots.txt)
+
+  # Code reloading can be explicitly enabled under the
+  # :code_reloader configuration of your endpoint.
+  if code_reloading? do
+    socket "/phoenix/live_reload/socket", Phoenix.LiveReloader.Socket
+    plug Phoenix.LiveReloader
+    plug Phoenix.CodeReloader
+  end
+
+  plug Plug.RequestId
+  plug Plug.Telemetry, event_prefix: [:phoenix, :endpoint]
+
+  plug Plug.Parsers,
+    parsers: [:urlencoded, :multipart, :json],
+    pass: ["*/*"],
+    json_decoder: Phoenix.json_library()
+
+  plug Plug.MethodOverride
+  plug Plug.Head
+  plug Plug.Session, @session_options
+  plug LiveBookWeb.Router
+end

lib/live_book_web/router.ex

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+defmodule LiveBookWeb.Router do
+  use LiveBookWeb, :router
+
+  pipeline :browser do
+    plug :accepts, ["html"]
+    plug :fetch_session
+    plug :fetch_flash
+    plug :protect_from_forgery
+    plug :put_secure_browser_headers
+  end
+
+  pipeline :api do
+    plug :accepts, ["json"]
+  end
+
+  scope "/", LiveBookWeb do
+    pipe_through :browser
+
+    get "/", PageController, :index
+  end
+
+  # Other scopes may use custom stacks.
+  # scope "/api", LiveBookWeb do
+  #   pipe_through :api
+  # end
+end

lib/live_book_web/telemetry.ex

@@ -0,0 +1,48 @@
+defmodule LiveBookWeb.Telemetry do
+  use Supervisor
+  import Telemetry.Metrics
+
+  def start_link(arg) do
+    Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
+  end
+
+  @impl true
+  def init(_arg) do
+    children = [
+      # Telemetry poller will execute the given period measurements
+      # every 10_000ms. Learn more here: https://hexdocs.pm/telemetry_metrics
+      {:telemetry_poller, measurements: periodic_measurements(), period: 10_000}
+      # Add reporters as children of your supervision tree.
+      # {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
+    ]
+
+    Supervisor.init(children, strategy: :one_for_one)
+  end
+
+  def metrics do
+    [
+      # Phoenix Metrics
+      summary("phoenix.endpoint.stop.duration",
+        unit: {:native, :millisecond}
+      ),
+      summary("phoenix.router_dispatch.stop.duration",
+        tags: [:route],
+        unit: {:native, :millisecond}
+      ),
+
+      # VM Metrics
+      summary("vm.memory.total", unit: {:byte, :kilobyte}),
+      summary("vm.total_run_queue_lengths.total"),
+      summary("vm.total_run_queue_lengths.cpu"),
+      summary("vm.total_run_queue_lengths.io")
+    ]
+  end
+
+  defp periodic_measurements do
+    [
+      # A module, function and arguments to be invoked periodically.
+      # This function must call :telemetry.execute/3 and a metric must be added above.
+      # {LiveBookWeb, :count_users, []}
+    ]
+  end
+end

lib/live_book_web/templates/layout/app.html.eex

@@ -0,0 +1,31 @@
+<!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>LiveBook · Phoenix Framework</title>
+    <link rel="stylesheet" href="<%= Routes.static_path(@conn, "/css/app.css") %>"/>
+    <script defer type="text/javascript" src="<%= Routes.static_path(@conn, "/js/app.js") %>"></script>
+  </head>
+  <body>
+    <header>
+      <section class="container">
+        <nav role="navigation">
+          <ul>
+            <li><a href="https://hexdocs.pm/phoenix/overview.html">Get Started</a></li>
+            
+          </ul>
+        </nav>
+        <a href="https://phoenixframework.org/" class="phx-logo">
+          <img src="<%= Routes.static_path(@conn, "/images/phoenix.png") %>" alt="Phoenix Framework Logo"/>
+        </a>
+      </section>
+    </header>
+    <main role="main" class="container">
+      <p class="alert alert-info" role="alert"><%= get_flash(@conn, :info) %></p>
+      <p class="alert alert-danger" role="alert"><%= get_flash(@conn, :error) %></p>
+      <%= @inner_content %>
+    </main>
+  </body>
+</html>

lib/live_book_web/templates/page/index.html.eex

@@ -0,0 +1,38 @@
+<section class="phx-hero">
+  <h1>Welcome to Phoenix!</h1>
+  <p>Peace of mind from prototype to production</p>
+</section>
+
+<section class="row">
+  <article class="column">
+    <h2>Resources</h2>
+    <ul>
+      <li>
+        <a href="https://hexdocs.pm/phoenix/overview.html">Guides &amp; Docs</a>
+      </li>
+      <li>
+        <a href="https://github.com/phoenixframework/phoenix">Source</a>
+      </li>
+      <li>
+        <a href="https://github.com/phoenixframework/phoenix/blob/v1.5/CHANGELOG.md">v1.5 Changelog</a>
+      </li>
+    </ul>
+  </article>
+  <article class="column">
+    <h2>Help</h2>
+    <ul>
+      <li>
+        <a href="https://elixirforum.com/c/phoenix-forum">Forum</a>
+      </li>
+      <li>
+        <a href="https://webchat.freenode.net/?channels=elixir-lang">#elixir-lang on Freenode IRC</a>
+      </li>
+      <li>
+        <a href="https://twitter.com/elixirphoenix">Twitter @elixirphoenix</a>
+      </li>
+      <li>
+        <a href="https://elixir-slackin.herokuapp.com/">Elixir on Slack</a>
+      </li>
+    </ul>
+  </article>
+</section>

lib/live_book_web/views/error_helpers.ex

@@ -0,0 +1,30 @@
+defmodule LiveBookWeb.ErrorHelpers do
+  @moduledoc """
+  Conveniences for translating and building error messages.
+  """
+
+  use Phoenix.HTML
+
+  @doc """
+  Generates tag for inlined form input errors.
+  """
+  def error_tag(form, field) do
+    Enum.map(Keyword.get_values(form.errors, field), fn error ->
+      content_tag(:span, translate_error(error),
+        class: "invalid-feedback",
+        phx_feedback_for: input_id(form, field)
+      )
+    end)
+  end
+
+  @doc """
+  Translates an error message.
+  """
+  def translate_error({msg, opts}) do
+    # Because the error messages we show in our forms and APIs
+    # are defined inside Ecto, we need to translate them dynamically.
+    Enum.reduce(opts, msg, fn {key, value}, acc ->
+      String.replace(acc, "%{#{key}}", to_string(value))
+    end)
+  end
+end

lib/live_book_web/views/error_view.ex

@@ -0,0 +1,16 @@
+defmodule LiveBookWeb.ErrorView do
+  use LiveBookWeb, :view
+
+  # If you want to customize a particular status code
+  # for a certain format, you may uncomment below.
+  # def render("500.html", _assigns) do
+  #   "Internal Server Error"
+  # end
+
+  # By default, Phoenix returns the status message from
+  # the template name. For example, "404.html" becomes
+  # "Not Found".
+  def template_not_found(template, _assigns) do
+    Phoenix.Controller.status_message_from_template(template)
+  end
+end

lib/live_book_web/views/layout_view.ex

@@ -0,0 +1,3 @@
+defmodule LiveBookWeb.LayoutView do
+  use LiveBookWeb, :view
+end

lib/live_book_web/views/page_view.ex

@@ -0,0 +1,3 @@
+defmodule LiveBookWeb.PageView do
+  use LiveBookWeb, :view
+end

mix.exs

@@ -0,0 +1,57 @@
+defmodule LiveBook.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :live_book,
+      version: "0.1.0",
+      elixir: "~> 1.7",
+      elixirc_paths: elixirc_paths(Mix.env()),
+      compilers: [:phoenix] ++ Mix.compilers(),
+      start_permanent: Mix.env() == :prod,
+      aliases: aliases(),
+      deps: deps()
+    ]
+  end
+
+  # Configuration for the OTP application.
+  #
+  # Type `mix help compile.app` for more information.
+  def application do
+    [
+      mod: {LiveBook.Application, []},
+      extra_applications: [:logger, :runtime_tools]
+    ]
+  end
+
+  # Specifies which paths to compile per environment.
+  defp elixirc_paths(:test), do: ["lib", "test/support"]
+  defp elixirc_paths(_), do: ["lib"]
+
+  # Specifies your project dependencies.
+  #
+  # Type `mix help deps` for examples and options.
+  defp deps do
+    [
+      {:phoenix, "~> 1.5.7"},
+      {:phoenix_html, "~> 2.11"},
+      {:phoenix_live_reload, "~> 1.2", only: :dev},
+      {:telemetry_metrics, "~> 0.4"},
+      {:telemetry_poller, "~> 0.4"},
+      {:jason, "~> 1.0"},
+      {:plug_cowboy, "~> 2.0"}
+    ]
+  end
+
+  # Aliases are shortcuts or tasks specific to the current project.
+  # For example, to install project dependencies and perform other setup tasks, run:
+  #
+  #     $ mix setup
+  #
+  # See the documentation for `Mix` for more info on aliases.
+  defp aliases do
+    [
+      setup: ["deps.get", "cmd npm install --prefix assets"]
+    ]
+  end
+end

mix.lock

@@ -0,0 +1,19 @@
+%{
+  "cowboy": {:hex, :cowboy, "2.8.0", "f3dc62e35797ecd9ac1b50db74611193c29815401e53bac9a5c0577bd7bc667d", [:rebar3], [{:cowlib, "~> 2.9.1", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "~> 1.7.1", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "4643e4fba74ac96d4d152c75803de6fad0b3fa5df354c71afdd6cbeeb15fac8a"},
+  "cowboy_telemetry": {:hex, :cowboy_telemetry, "0.3.1", "ebd1a1d7aff97f27c66654e78ece187abdc646992714164380d8a041eda16754", [:rebar3], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "3a6efd3366130eab84ca372cbd4a7d3c3a97bdfcfb4911233b035d117063f0af"},
+  "cowlib": {:hex, :cowlib, "2.9.1", "61a6c7c50cf07fdd24b2f45b89500bb93b6686579b069a89f88cb211e1125c78", [:rebar3], [], "hexpm", "e4175dc240a70d996156160891e1c62238ede1729e45740bdd38064dad476170"},
+  "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},
+  "jason": {:hex, :jason, "1.2.2", "ba43e3f2709fd1aa1dce90aaabfd039d000469c05c56f0b8e31978e03fa39052", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "18a228f5f0058ee183f29f9eae0805c6e59d61c3b006760668d8d18ff0d12179"},
+  "mime": {:hex, :mime, "1.5.0", "203ef35ef3389aae6d361918bf3f952fa17a09e8e43b5aa592b93eba05d0fb8d", [:mix], [], "hexpm", "55a94c0f552249fc1a3dd9cd2d3ab9de9d3c89b559c2bd01121f824834f24746"},
+  "phoenix": {:hex, :phoenix, "1.5.7", "2923bb3af924f184459fe4fa4b100bd25fa6468e69b2803dfae82698269aa5e0", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix_html, "~> 2.13", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 2.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:plug, "~> 1.10", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 1.0 or ~> 2.2", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:plug_crypto, "~> 1.1.2 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "774cd64417c5a3788414fdbb2be2eb9bcd0c048d9e6ad11a0c1fd67b7c0d0978"},
+  "phoenix_html": {:hex, :phoenix_html, "2.14.3", "51f720d0d543e4e157ff06b65de38e13303d5778a7919bcc696599e5934271b8", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "efd697a7fff35a13eeeb6b43db884705cba353a1a41d127d118fda5f90c8e80f"},
+  "phoenix_live_reload": {:hex, :phoenix_live_reload, "1.3.0", "f35f61c3f959c9a01b36defaa1f0624edd55b87e236b606664a556d6f72fd2e7", [:mix], [{:file_system, "~> 0.2.1 or ~> 0.3", [hex: :file_system, repo: "hexpm", optional: false]}, {:phoenix, "~> 1.4", [hex: :phoenix, repo: "hexpm", optional: false]}], "hexpm", "02c1007ae393f2b76ec61c1a869b1e617179877984678babde131d716f95b582"},
+  "phoenix_pubsub": {:hex, :phoenix_pubsub, "2.0.0", "a1ae76717bb168cdeb10ec9d92d1480fec99e3080f011402c0a2d68d47395ffb", [:mix], [], "hexpm", "c52d948c4f261577b9c6fa804be91884b381a7f8f18450c5045975435350f771"},
+  "plug": {:hex, :plug, "1.11.0", "f17217525597628298998bc3baed9f8ea1fa3f1160aa9871aee6df47a6e4d38e", [:mix], [{:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "2d9c633f0499f9dc5c2fd069161af4e2e7756890b81adcbb2ceaa074e8308876"},
+  "plug_cowboy": {:hex, :plug_cowboy, "2.4.1", "779ba386c0915027f22e14a48919a9545714f849505fa15af2631a0d298abf0f", [:mix], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:cowboy_telemetry, "~> 0.3", [hex: :cowboy_telemetry, repo: "hexpm", optional: false]}, {:plug, "~> 1.7", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "d72113b6dff7b37a7d9b2a5b68892808e3a9a752f2bf7e503240945385b70507"},
+  "plug_crypto": {:hex, :plug_crypto, "1.2.0", "1cb20793aa63a6c619dd18bb33d7a3aa94818e5fd39ad357051a67f26dfa2df6", [:mix], [], "hexpm", "a48b538ae8bf381ffac344520755f3007cc10bd8e90b240af98ea29b69683fc2"},
+  "ranch": {:hex, :ranch, "1.7.1", "6b1fab51b49196860b733a49c07604465a47bdb78aa10c1c16a3d199f7f8c881", [:rebar3], [], "hexpm", "451d8527787df716d99dc36162fca05934915db0b6141bbdac2ea8d3c7afc7d7"},
+  "telemetry": {:hex, :telemetry, "0.4.2", "2808c992455e08d6177322f14d3bdb6b625fbcfd233a73505870d8738a2f4599", [:rebar3], [], "hexpm", "2d1419bd9dda6a206d7b5852179511722e2b18812310d304620c7bd92a13fcef"},
+  "telemetry_metrics": {:hex, :telemetry_metrics, "0.6.0", "da9d49ee7e6bb1c259d36ce6539cd45ae14d81247a2b0c90edf55e2b50507f7b", [:mix], [{:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "5cfe67ad464b243835512aa44321cee91faed6ea868d7fb761d7016e02915c3d"},
+  "telemetry_poller": {:hex, :telemetry_poller, "0.5.1", "21071cc2e536810bac5628b935521ff3e28f0303e770951158c73eaaa01e962a", [:rebar3], [{:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "4cab72069210bc6e7a080cec9afffad1b33370149ed5d379b81c7c5f0c663fd4"},
+}

test/live_book_web/controllers/page_controller_test.exs

@@ -0,0 +1,8 @@
+defmodule LiveBookWeb.PageControllerTest do
+  use LiveBookWeb.ConnCase
+
+  test "GET /", %{conn: conn} do
+    conn = get(conn, "/")
+    assert html_response(conn, 200) =~ "Welcome to Phoenix!"
+  end
+end

test/live_book_web/views/error_view_test.exs

@@ -0,0 +1,14 @@
+defmodule LiveBookWeb.ErrorViewTest do
+  use LiveBookWeb.ConnCase, async: true
+
+  # Bring render/3 and render_to_string/3 for testing custom views
+  import Phoenix.View
+
+  test "renders 404.html" do
+    assert render_to_string(LiveBookWeb.ErrorView, "404.html", []) == "Not Found"
+  end
+
+  test "renders 500.html" do
+    assert render_to_string(LiveBookWeb.ErrorView, "500.html", []) == "Internal Server Error"
+  end
+end

test/live_book_web/views/layout_view_test.exs

@@ -0,0 +1,8 @@
+defmodule LiveBookWeb.LayoutViewTest do
+  use LiveBookWeb.ConnCase, async: true
+
+  # When testing helpers, you may want to import Phoenix.HTML and
+  # use functions such as safe_to_string() to convert the helper
+  # result into an HTML string.
+  # import Phoenix.HTML
+end

test/live_book_web/views/page_view_test.exs

@@ -0,0 +1,3 @@
+defmodule LiveBookWeb.PageViewTest do
+  use LiveBookWeb.ConnCase, async: true
+end

test/support/conn_case.ex

@@ -0,0 +1,37 @@
+defmodule LiveBookWeb.ConnCase do
+  @moduledoc """
+  This module defines the test case to be used by
+  tests that require setting up a connection.
+
+  Such tests rely on `Phoenix.ConnTest` and also
+  import other functionality to make it easier
+  to build common data structures and query the data layer.
+
+  Finally, if the test case interacts with the database,
+  we enable the SQL sandbox, so changes done to the database
+  are reverted at the end of every test. If you are using
+  PostgreSQL, you can even run database tests asynchronously
+  by setting `use LiveBookWeb.ConnCase, async: true`, although
+  this option is not recommended for other databases.
+  """
+
+  use ExUnit.CaseTemplate
+
+  using do
+    quote do
+      # Import conveniences for testing with connections
+      import Plug.Conn
+      import Phoenix.ConnTest
+      import LiveBookWeb.ConnCase
+
+      alias LiveBookWeb.Router.Helpers, as: Routes
+
+      # The default endpoint for testing
+      @endpoint LiveBookWeb.Endpoint
+    end
+  end
+
+  setup _tags do
+    {:ok, conn: Phoenix.ConnTest.build_conn()}
+  end
+end

test/test_helper.exs

@@ -0,0 +1 @@
+ExUnit.start()