feat: data extension (#24)

allows reading from yaml files

Author: mhanberg

lib/tableau/extensions/data_extension.ex

@@ -0,0 +1,36 @@
+defmodule Tableau.DataExtension.Config do
+  import Schematic
+
+  defstruct enabled: true, dir: "_data"
+
+  def new(input), do: unify(schematic(), input)
+
+  def schematic do
+    schema(
+      __MODULE__,
+      %{
+        optional(:enabled) => bool(),
+        optional(:dir) => str()
+      },
+      convert: false
+    )
+  end
+end
+
+defmodule Tableau.DataExtension do
+  use Tableau.Extension, key: :data, type: :pre_build, priority: 200
+
+  def run(token) do
+    data =
+      for file <- Path.wildcard(Path.join(token.data.dir, "**/*.{yml,yaml}")), into: %{} do
+        key =
+          file
+          |> Path.basename(".yaml")
+          |> Path.basename(".yml")
+
+        {key, YamlElixir.read_from_file!(file)}
+      end
+
+    {:ok, Map.put(token, :data, data)}
+  end
+end

lib/tableau/extensions/post_extension.ex

@@ -19,11 +19,9 @@ defmodule Tableau.PostExtension.Config do
 end
 
 defmodule Tableau.PostExtension.Posts.Post do
-  {:ok, config} = Tableau.Config.new(Map.new(Application.compile_env(:tableau, :config, %{})))
-
-  @config config
-
   def build(filename, attrs, body) do
+    {:ok, config} = Tableau.Config.new(Map.new(Application.get_env(:tableau, :config, %{})))
+
     attrs
     |> Map.put(:body, body)
     |> Map.put(:file, filename)
@@ -32,7 +30,7 @@ defmodule Tableau.PostExtension.Posts.Post do
       :date,
       DateTime.from_naive!(
         Code.eval_string(attrs.date) |> elem(0),
-        @config.timezone
+        config.timezone
       )
     )
     |> Map.put(

test/support/fixtures/movies.yaml

@@ -0,0 +1,4 @@
+movies:
+  - name: Back to the Future
+  - name: Spider-Man 2
+  - name: Titanic

test/tableau/extensions/data_extension_test.exs

@@ -0,0 +1,30 @@
+defmodule Tableau.DataExtensionTest do
+  use ExUnit.Case, async: true
+
+  alias Tableau.DataExtension
+
+  test "reads files from disk" do
+    token = %{data: %{dir: "test/support/fixtures"}}
+
+    assert {:ok, actual} = DataExtension.run(token)
+
+    assert actual == %{
+             data: %{
+               "books" => %{
+                 "books" => [
+                   %{"author" => "Michael Crichton", "name" => "Jurassic Park"},
+                   %{"author" => "JRR Tolkien", "name" => "Lord of the Rings"},
+                   %{"author" => "Blake Crouch", "name" => "Dark Matter"}
+                 ]
+               },
+               "movies" => %{
+                 "movies" => [
+                   %{"name" => "Back to the Future"},
+                   %{"name" => "Spider-Man 2"},
+                   %{"name" => "Titanic"}
+                 ]
+               }
+             }
+           }
+  end
+end