introduces Styler as formatter

.formatter.exs

@@ -1,4 +1,5 @@
 # Used by "mix format"
 [
-  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"],
+  plugins: [Styler]
 ]

lib/vasov.ex

@@ -1,11 +1,13 @@
-defmodule Vasov do
-  @external_resource "README.md"
+external_resource = "README.md"
 
-  @moduledoc @external_resource
+defmodule Vasov do
+  @moduledoc external_resource
              |> File.read!()
              |> String.split("<!-- MDOC !-->")
              |> Enum.fetch!(1)
 
+  @external_resource external_resource
+
   @transliteration_table %{
     "Р" => "R",
     "з" => "z",

mix.exs

@@ -37,15 +37,16 @@ defmodule Vasov.MixProject do
       {:credo, "~> 1.7", only: [:dev, :test], runtime: false},
       {:mix_audit, "~> 2.0", only: [:dev, :test], runtime: false},
       {:ex_doc, ">= 0.0.0", only: :dev, runtime: false},
-      {:mix_test_watch, "~> 1.1", only: [:test, :dev], runtime: false}
+      {:mix_test_watch, "~> 1.1", only: [:test, :dev], runtime: false},
+      {:styler, "~> 1.1", only: [:dev, :test], runtime: false}
     ]
   end
 
   defp description do
     "Transliterates from bulgarian cyrillic to latin."
   end
 
-  defp package() do
+  defp package do
     [
       name: "vasov",
       licenses: ["Apache-2.0"],

mix.lock

@@ -12,6 +12,7 @@
   "mix_test_interactive": {:hex, :mix_test_interactive, "1.2.2", "72f72faa7007d6cb9634ee5f6989b25ee5b194c5729e5e45a962e68b2e217374", [:mix], [{:file_system, "~> 0.2", [hex: :file_system, repo: "hexpm", optional: false]}, {:typed_struct, "~> 0.3.0", [hex: :typed_struct, repo: "hexpm", optional: false]}], "hexpm", "f49f2a70d00aee93418506dde4d95387fe56bdba501ef9d2aa06ea07d4823508"},
   "mix_test_watch": {:hex, :mix_test_watch, "1.2.0", "1f9acd9e1104f62f280e30fc2243ae5e6d8ddc2f7f4dc9bceb454b9a41c82b42", [:mix], [{:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}], "hexpm", "278dc955c20b3fb9a3168b5c2493c2e5cffad133548d307e0a50c7f2cfbf34f6"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.4.0", "51f9b613ea62cfa97b25ccc2c1b4216e81df970acd8e16e8d1bdc58fef21370d", [:mix], [], "hexpm", "9c565862810fb383e9838c1dd2d7d2c437b3d13b267414ba6af33e50d2d1cf28"},
+  "styler": {:hex, :styler, "1.1.2", "d5b14cd4f8f7cc45624d9485cd0edb277ec92583b118409cfcbcb7c78efa5f4b", [:mix], [], "hexpm", "b46edab1f129d0c839d426755e172cf92118e5fac877456d074156b335f1f80b"},
   "typed_struct": {:hex, :typed_struct, "0.3.0", "939789e3c1dca39d7170c87f729127469d1315dcf99fee8e152bb774b17e7ff7", [:mix], [], "hexpm", "c50bd5c3a61fe4e198a8504f939be3d3c85903b382bde4865579bc23111d1b6d"},
   "yamerl": {:hex, :yamerl, "0.10.0", "4ff81fee2f1f6a46f1700c0d880b24d193ddb74bd14ef42cb0bcf46e81ef2f8e", [:rebar3], [], "hexpm", "346adb2963f1051dc837a2364e4acf6eb7d80097c0f53cbdc3046ec8ec4b4e6e"},
   "yaml_elixir": {:hex, :yaml_elixir, "2.11.0", "9e9ccd134e861c66b84825a3542a1c22ba33f338d82c07282f4f1f52d847bd50", [:mix], [{:yamerl, "~> 0.10", [hex: :yamerl, repo: "hexpm", optional: false]}], "hexpm", "53cc28357ee7eb952344995787f4bb8cc3cecbf189652236e9b163e8ce1bc242"},