From 1ff6b38b03a6c0f8319384a658087253cfa74319 Mon Sep 17 00:00:00 2001
From: Dan Schultzer <1254724+danschultzer@users.noreply.github.com>
Date: Sun, 19 Nov 2023 16:01:40 -0800
Subject: [PATCH] Enforce formatting

---
 .formatter.exs                             |  3 ++
 .github/workflows/ci.yml                   |  1 +
 lib/premailex/html_inline_styles.ex        | 33 +++++++++----
 lib/premailex/html_parser/floki.ex         |  6 +--
 lib/premailex/html_parser/meeseeks.ex      |  2 +-
 lib/premailex/http_adapter.ex              | 13 ++---
 lib/premailex/http_adapter/httpc.ex        | 24 ++++++----
 mix.exs                                    | 16 +++++--
 test/premailex/html_inline_styles_test.exs | 55 +++++++++++++++-------
 test/premailex/html_to_plain_text_test.exs |  2 +
 10 files changed, 105 insertions(+), 50 deletions(-)
 create mode 100644 .formatter.exs

diff --git a/.formatter.exs b/.formatter.exs
new file mode 100644
index 0000000..682fc6c
--- /dev/null
+++ b/.formatter.exs
@@ -0,0 +1,3 @@
+[
+  inputs: ["{mix,.formatter}.exs", "{lib,test}/**/*.{ex,exs}"]
+]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 09f5b86..a911300 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,6 +21,7 @@ jobs:
       - run: mix deps.get
       - run: mix compile --warnings-as-errors
       - run: mix credo --strict
+      - run: mix format --check-formatted
 
   test:
     strategy:
diff --git a/lib/premailex/html_inline_styles.ex b/lib/premailex/html_inline_styles.ex
index 3d99c88..6674d71 100644
--- a/lib/premailex/html_inline_styles.ex
+++ b/lib/premailex/html_inline_styles.ex
@@ -16,26 +16,34 @@ defmodule Premailex.HTMLInlineStyles do
       * `:all` - apply all optimization steps
       * `:remove_style_tags` - Remove style tags (can be combined in a list)
   """
-  @spec process(String.t() | HTMLParser.html_tree(), [CSSParser.rule_set()] | nil, Keyword.t() | nil) :: String.t()
+  @spec process(
+          String.t() | HTMLParser.html_tree(),
+          [CSSParser.rule_set()] | nil,
+          Keyword.t() | nil
+        ) :: String.t()
   def process(html_or_html_tree, css_rule_sets_or_options \\ nil, options \\ nil)
+
   def process(html, css_rule_sets_or_options, options) when is_binary(html) do
     html
     |> HTMLParser.parse()
     |> process(css_rule_sets_or_options, options)
   end
+
   def process(html_tree, css_rule_sets_or_options, nil) do
     case Keyword.keyword?(css_rule_sets_or_options) do
-      true  -> process(html_tree, nil, css_rule_sets_or_options)
+      true -> process(html_tree, nil, css_rule_sets_or_options)
       false -> process(html_tree, css_rule_sets_or_options, [])
     end
   end
+
   def process(html_tree, nil, options) do
-    css_selector  = Keyword.get(options, :css_selector, "style,link[rel=\"stylesheet\"][href]")
+    css_selector = Keyword.get(options, :css_selector, "style,link[rel=\"stylesheet\"][href]")
     css_rule_sets = load_styles(html_tree, css_selector)
-    options       = Keyword.put_new(options, :css_selector, css_selector)
+    options = Keyword.put_new(options, :css_selector, css_selector)
 
     process(html_tree, css_rule_sets, options)
   end
+
   def process(html_tree, css_rules_sets, options) do
     optimize_steps = Keyword.get(options, :optimize, :none)
     optimize_options = Keyword.take(options, [:css_selector])
@@ -67,16 +75,17 @@ defmodule Premailex.HTMLInlineStyles do
       end)
 
     visible_html_tree =
-      Enum.reduce(hidden_elements, html_tree, fn {_index, hidden_element, placeholder}, html_tree ->
+      Enum.reduce(hidden_elements, html_tree, fn {_index, hidden_element, placeholder},
+                                                 html_tree ->
         Util.traverse_until_first(html_tree, hidden_element, fn _element -> placeholder end)
       end)
 
     styles
     |> Enum.reduce(visible_html_tree, &add_rule_set_to_html(&1, &2))
     |> Util.traverse("premailex", fn {"premailex", attrs, _children} ->
-      {"data-index", index} = Enum.find(attrs, & elem(&1, 0) == "data-index")
+      {"data-index", index} = Enum.find(attrs, &(elem(&1, 0) == "data-index"))
 
-      {_index, hidden_element, _replacement} = Enum.find(hidden_elements, & elem(&1, 0) == index)
+      {_index, hidden_element, _replacement} = Enum.find(hidden_elements, &(elem(&1, 0) == index))
 
       hidden_element
     end)
@@ -98,14 +107,17 @@ defmodule Premailex.HTMLInlineStyles do
     |> parse_body(http_adapter, url)
   end
 
-  defp parse_body({:ok, %{status: status, body: body}}, _http_adapter, _url) when status in 200..399 do
+  defp parse_body({:ok, %{status: status, body: body}}, _http_adapter, _url)
+       when status in 200..399 do
     CSSParser.parse(body)
   end
+
   defp parse_body({:ok, %{status: status}}, _http_adapter, url) do
     Logger.warning("Ignoring #{url} styles because received unexpected HTTP status: #{status}")
 
     nil
   end
+
   defp parse_body({:error, error}, http_adapter, url) do
     Logger.warning(
       "Ignoring #{url} styles because of unexpected error from #{inspect(http_adapter)}:\n\n#{inspect(error)}"
@@ -173,7 +185,7 @@ defmodule Premailex.HTMLInlineStyles do
       |> CSSParser.merge()
       |> CSSParser.to_string()
       |> case do
-        ""    -> current_style
+        "" -> current_style
         style -> style
       end
 
@@ -194,6 +206,7 @@ defmodule Premailex.HTMLInlineStyles do
   end
 
   defp maybe_remove_style_tags(tree, _steps, nil), do: tree
+
   defp maybe_remove_style_tags(tree, steps, css_selector) do
     case Enum.member?(steps, :remove_style_tags) do
       true -> HTMLParser.filter(tree, css_selector)
@@ -212,7 +225,7 @@ defmodule Premailex.HTMLInlineStyles do
   defp http_adapter do
     case Application.get_env(:premailex, :http_adapter, Premailex.HTTPAdapter.Httpc) do
       {adapter, opts} -> {adapter, opts}
-      adapter         -> {adapter, nil}
+      adapter -> {adapter, nil}
     end
   end
 end
diff --git a/lib/premailex/html_parser/floki.ex b/lib/premailex/html_parser/floki.ex
index 490470b..4df1103 100644
--- a/lib/premailex/html_parser/floki.ex
+++ b/lib/premailex/html_parser/floki.ex
@@ -13,13 +13,13 @@ defmodule Premailex.HTMLParser.Floki do
     "< 0.24.0"
     |> floki_version_match?()
     |> case do
-      true  -> apply(Floki, :parse, args)
+      true -> apply(Floki, :parse, args)
       false -> apply(Floki, :parse_document, args)
     end
     |> case do
-      {:ok, [html]}   -> html
+      {:ok, [html]} -> html
       {:ok, document} -> document
-      any             -> any
+      any -> any
     end
   end
 
diff --git a/lib/premailex/html_parser/meeseeks.ex b/lib/premailex/html_parser/meeseeks.ex
index 623a058..3f6032b 100644
--- a/lib/premailex/html_parser/meeseeks.ex
+++ b/lib/premailex/html_parser/meeseeks.ex
@@ -54,7 +54,7 @@ defmodule Premailex.HTMLParser.Meeseeks do
   @doc false
   def filter(tree, selector) do
     selector = CSS.compile_selectors(selector)
-    tree     = Meeseeks.parse(tree, :tuple_tree)
+    tree = Meeseeks.parse(tree, :tuple_tree)
 
     tree
     |> Meeseeks.all(selector)
diff --git a/lib/premailex/http_adapter.ex b/lib/premailex/http_adapter.ex
index 9637a72..0ec7645 100644
--- a/lib/premailex/http_adapter.ex
+++ b/lib/premailex/http_adapter.ex
@@ -5,11 +5,11 @@ defmodule Premailex.HTTPAdapter do
     @moduledoc false
 
     @type header :: {binary(), binary()}
-    @type t      :: %__MODULE__{
-      status: integer(),
-      headers: [header()],
-      body: binary()
-    }
+    @type t :: %__MODULE__{
+            status: integer(),
+            headers: [header()],
+            body: binary()
+          }
 
     defstruct status: 200, headers: [], body: ""
   end
@@ -18,7 +18,8 @@ defmodule Premailex.HTTPAdapter do
   @type body :: binary() | nil
   @type headers :: [{binary(), binary()}]
 
-  @callback request(method(), binary(), body(), headers(), Keyword.t()) :: {:ok, map()} | {:error, any()}
+  @callback request(method(), binary(), body(), headers(), Keyword.t()) ::
+              {:ok, map()} | {:error, any()}
 
   @spec user_agent_header() :: {binary(), binary()}
   def user_agent_header do
diff --git a/lib/premailex/http_adapter/httpc.ex b/lib/premailex/http_adapter/httpc.ex
index c302f21..f3f1446 100644
--- a/lib/premailex/http_adapter/httpc.ex
+++ b/lib/premailex/http_adapter/httpc.ex
@@ -20,8 +20,8 @@ defmodule Premailex.HTTPAdapter.Httpc do
   end
 
   defp httpc_request(url, body, headers) do
-    url          = to_charlist(url)
-    headers      = Enum.map(headers, fn {k, v} -> {to_charlist(k), to_charlist(v)} end)
+    url = to_charlist(url)
+    headers = Enum.map(headers, fn {k, v} -> {to_charlist(k), to_charlist(v)} end)
 
     do_httpc_request(url, body, headers)
   end
@@ -29,26 +29,32 @@ defmodule Premailex.HTTPAdapter.Httpc do
   defp do_httpc_request(url, nil, headers) do
     {url, headers}
   end
+
   defp do_httpc_request(url, body, headers) do
     {content_type, headers} = split_content_type_headers(headers)
-    body                    = to_charlist(body)
+    body = to_charlist(body)
 
     {url, headers, content_type, body}
   end
 
   defp split_content_type_headers(headers) do
-    case List.keytake(headers, 'content-type', 0) do
-      nil -> {'text/plain', headers}
+    case List.keytake(headers, ~c"content-type", 0) do
+      nil -> {~c"text/plain", headers}
       {{_, ct}, headers} -> {ct, headers}
     end
   end
 
   defp format_response({:ok, {{_, status, _}, headers, body}}) do
-    headers = Enum.map(headers, fn {key, value} -> {String.downcase(to_string(key)), to_string(value)} end)
-    body    = IO.iodata_to_binary(body)
+    headers =
+      Enum.map(headers, fn {key, value} ->
+        {String.downcase(to_string(key)), to_string(value)}
+      end)
+
+    body = IO.iodata_to_binary(body)
 
     {:ok, %HTTPResponse{status: status, headers: headers, body: body}}
   end
+
   defp format_response({:error, error}), do: {:error, error}
 
   defp parse_httpc_opts(nil, url), do: default_httpc_opts(url)
@@ -56,7 +62,7 @@ defmodule Premailex.HTTPAdapter.Httpc do
 
   defp default_httpc_opts(url) do
     case certifi_and_ssl_verify_fun_available?() do
-      true  -> [ssl: ssl_opts(url)]
+      true -> [ssl: ssl_opts(url)]
       false -> []
     end
   end
@@ -71,7 +77,7 @@ defmodule Premailex.HTTPAdapter.Httpc do
   defp app_available?(app) do
     case :application.get_key(app, :vsn) do
       {:ok, _vsn} -> true
-      _           -> false
+      _ -> false
     end
   end
 
diff --git a/mix.exs b/mix.exs
index aa8d650..fd64cef 100644
--- a/mix.exs
+++ b/mix.exs
@@ -10,7 +10,16 @@ defmodule Premailex.Mixfile do
       elixir: "~> 1.11",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
-      xref: [exclude: [:certifi, :httpc, Meeseeks, Meeseeks.Document, Meeseeks.Selector.CSS, :ssl_verify_hostname]],
+      xref: [
+        exclude: [
+          :certifi,
+          :httpc,
+          Meeseeks,
+          Meeseeks.Document,
+          Meeseeks.Selector.CSS,
+          :ssl_verify_hostname
+        ]
+      ],
 
       # Hex
       description: "Add inline styling to your HTML emails, and transform them to text",
@@ -31,13 +40,12 @@ defmodule Premailex.Mixfile do
   defp deps do
     [
       {:floki, "~> 0.19"},
-
       {:meeseeks, "~> 0.11", optional: true},
       {:certifi, ">= 0.0.0", optional: true},
       {:ssl_verify_fun, ">= 0.0.0", optional: true},
-
-      {:credo, "~> 1.4", only: [:dev, :test], runtime: false},
+      # Development and test
       {:ex_doc, ">= 0.0.0", only: :dev, runtime: false},
+      {:credo, "~> 1.4", only: [:dev, :test], runtime: false},
       {:test_server, "~> 0.1.5", only: [:test]}
     ]
   end
diff --git a/test/premailex/html_inline_styles_test.exs b/test/premailex/html_inline_styles_test.exs
index 7ffa7a5..4630ec2 100644
--- a/test/premailex/html_inline_styles_test.exs
+++ b/test/premailex/html_inline_styles_test.exs
@@ -100,7 +100,10 @@ defmodule Premailex.HTMLInlineStylesTest do
           @input
 
         _ ->
-          TestServer.add("/styles.css", to: fn conn -> Plug.Conn.send_resp(conn, 200, @css_link_content) end)
+          TestServer.add("/styles.css",
+            to: fn conn -> Plug.Conn.send_resp(conn, 200, @css_link_content) end
+          )
+
           String.replace(@input, "http://localhost", TestServer.url())
       end
 
@@ -134,14 +137,20 @@ defmodule Premailex.HTMLInlineStylesTest do
 
     refute parsed =~ "This is a comment"
 
-    assert parsed =~ ~r/(#{Regex.escape("<!--[if (gte mso 9)|(IE)]>")})|(#{Regex.escape("<!-- [if (gte mso 9)|(IE)]>")})/
+    assert parsed =~
+             ~r/(#{Regex.escape("<!--[if (gte mso 9)|(IE)]>")})|(#{Regex.escape("<!-- [if (gte mso 9)|(IE)]>")})/
+
     assert parsed =~ "<p>Downlevel-hidden comment</p>"
     assert parsed =~ ~r/(#{Regex.escape("<![endif]-->")})|(#{Regex.escape("<![endif] -->")})/
 
-    assert parsed =~ ~r/(#{Regex.escape("<!--[if !mso]><!-- -->")})|(#{Regex.escape("<!-- [if !mso]><!--  -->")})/
     assert parsed =~
-            "<p style=\"background-color: #000; color: #000 !important; font-family: Arial, sans-serif; font-size: 16px; font-weight: bold; line-height: 22px; margin: 0; padding: 0;\">Downlevel-revealed comment</p>"
-    assert parsed =~ ~r/(#{Regex.escape("<!--<![endif]-->")})|(#{Regex.escape("<!-- <![endif] -->")})/
+             ~r/(#{Regex.escape("<!--[if !mso]><!-- -->")})|(#{Regex.escape("<!-- [if !mso]><!--  -->")})/
+
+    assert parsed =~
+             "<p style=\"background-color: #000; color: #000 !important; font-family: Arial, sans-serif; font-size: 16px; font-weight: bold; line-height: 22px; margin: 0; padding: 0;\">Downlevel-revealed comment</p>"
+
+    assert parsed =~
+             ~r/(#{Regex.escape("<!--<![endif]-->")})|(#{Regex.escape("<!-- <![endif] -->")})/
 
     assert parsed =~ "<div class=\"match-order-test-1 same-match\" style=\"color: yellow;\">"
     assert parsed =~ "<div class=\"match-order-test-2 same-match\" style=\"color: yellow;\">"
@@ -152,8 +161,10 @@ defmodule Premailex.HTMLInlineStylesTest do
   @tag test_server: false
   test "process/3 when styles can't be loaded due to no network", %{input: input} do
     assert CaptureLog.capture_log(fn ->
-      refute Premailex.HTMLInlineStyles.process(input) =~ "<html xmlns=\"http://www.w3.org/1999/xhtml\" style=\"color: black;\">"
-    end) =~ "Ignoring http://localhost/styles.css styles because of unexpected error from Premailex.HTTPAdapter.Httpc:"
+             refute Premailex.HTMLInlineStyles.process(input) =~
+                      "<html xmlns=\"http://www.w3.org/1999/xhtml\" style=\"color: black;\">"
+           end) =~
+             "Ignoring http://localhost/styles.css styles because of unexpected error from Premailex.HTTPAdapter.Httpc:"
   end
 
   @tag test_server: false
@@ -162,8 +173,10 @@ defmodule Premailex.HTMLInlineStylesTest do
     input = String.replace(input, "http://localhost", TestServer.url())
 
     assert CaptureLog.capture_log(fn ->
-      refute Premailex.HTMLInlineStyles.process(input) =~ "<html xmlns=\"http://www.w3.org/1999/xhtml\" style=\"color: black;\">"
-    end) =~ "Ignoring #{TestServer.url()}/styles.css styles because received unexpected HTTP status: 404"
+             refute Premailex.HTMLInlineStyles.process(input) =~
+                      "<html xmlns=\"http://www.w3.org/1999/xhtml\" style=\"color: black;\">"
+           end) =~
+             "Ignoring #{TestServer.url()}/styles.css styles because received unexpected HTTP status: 404"
   end
 
   @tag test_server: false
@@ -172,14 +185,18 @@ defmodule Premailex.HTMLInlineStylesTest do
     input = String.replace(input, "http://localhost", TestServer.url())
 
     assert CaptureLog.capture_log(fn ->
-      refute Premailex.HTMLInlineStyles.process(input) =~ "<html xmlns=\"http://www.w3.org/1999/xhtml\" style=\"color: black;\">"
-    end) =~ ":unknown_ca"
+             refute Premailex.HTMLInlineStyles.process(input) =~
+                      "<html xmlns=\"http://www.w3.org/1999/xhtml\" style=\"color: black;\">"
+           end) =~ ":unknown_ca"
   end
 
-  @tag test_server: :false
+  @tag test_server: false
   test "process/3 when styles loads on SSL", %{input: input} do
     TestServer.start(scheme: :https)
-    TestServer.add("/styles.css", to: fn conn -> Plug.Conn.send_resp(conn, 200, @css_link_content) end)
+
+    TestServer.add("/styles.css",
+      to: fn conn -> Plug.Conn.send_resp(conn, 200, @css_link_content) end
+    )
 
     on_exit(fn ->
       Application.delete_env(:premailex, :http_adapter)
@@ -190,7 +207,7 @@ defmodule Premailex.HTMLInlineStylesTest do
         verify: :verify_peer,
         depth: 99,
         cacerts: TestServer.x509_suite().cacerts,
-        verify_fun: {&:ssl_verify_hostname.verify_fun/3, check_hostname: 'localhost'}
+        verify_fun: {&:ssl_verify_hostname.verify_fun/3, check_hostname: ~c"localhost"}
       ]
 
     Application.put_env(:premailex, :http_adapter, {Premailex.HTTPAdapter.Httpc, [ssl: ssl_opts]})
@@ -251,17 +268,21 @@ defmodule Premailex.HTMLInlineStylesTest do
     assert parsed =~ "<html xmlns=\"http://www.w3.org/1999/xhtml\" style=\"color: black;\">"
     assert parsed =~ "<style>"
     assert parsed =~ "<link href"
-    assert parsed =~ "<body style=\"color: #333333; font-family: Arial, sans-serif; font-size: 14px; line-height: 22px;\">"
+
+    assert parsed =~
+             "<body style=\"color: #333333; font-family: Arial, sans-serif; font-size: 14px; line-height: 22px;\">"
   end
 
   test "process/3 accepts html tree as first argument and options as second", %{input: input} do
     html_tree = Premailex.HTMLParser.parse(input)
-    parsed = Premailex.HTMLInlineStyles.process(html_tree, [optimize: :all])
+    parsed = Premailex.HTMLInlineStyles.process(html_tree, optimize: :all)
 
     assert parsed =~ "<html xmlns=\"http://www.w3.org/1999/xhtml\" style=\"color: black;\">"
     refute parsed =~ "<style>"
     refute parsed =~ "<link href"
-    assert parsed =~ "<body style=\"color: #333333; font-family: Arial, sans-serif; font-size: 14px; line-height: 22px;\">"
+
+    assert parsed =~
+             "<body style=\"color: #333333; font-family: Arial, sans-serif; font-size: 14px; line-height: 22px;\">"
   end
 
   @tag test_server: false
diff --git a/test/premailex/html_to_plain_text_test.exs b/test/premailex/html_to_plain_text_test.exs
index 01a9748..52e9120 100644
--- a/test/premailex/html_to_plain_text_test.exs
+++ b/test/premailex/html_to_plain_text_test.exs
@@ -167,8 +167,10 @@ defmodule Premailex.HTMLToPlainTextTest do
   defp add_attribute(elements, key, value) when is_list(elements) do
     Enum.map(elements, &add_attribute(&1, key, value))
   end
+
   defp add_attribute({tag, attrs, children}, key, value) do
     {tag, attrs ++ [{key, value}], add_attribute(children, key, value)}
   end
+
   defp add_attribute(other, _key, _value), do: other
 end