diff --git a/.formatter.exs b/.formatter.exs
new file mode 100644
index 0000000..d2cda26
--- /dev/null
+++ b/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/lib/auto_linker.ex b/lib/auto_linker.ex
index c1eadaa..c8f5f12 100644
--- a/lib/auto_linker.ex
+++ b/lib/auto_linker.ex
@@ -51,7 +51,6 @@ defmodule AutoLinker do
   Note that passing opts to `link/2` will override the configuration settings.
   """
   def link(text, opts \\ []) do
-    parse text, opts
+    parse(text, opts)
   end
-
 end
diff --git a/lib/auto_linker/builder.ex b/lib/auto_linker/builder.ex
index 3489d00..4ebe85e 100644
--- a/lib/auto_linker/builder.ex
+++ b/lib/auto_linker/builder.ex
@@ -24,20 +24,21 @@ defmodule AutoLinker.Builder do
   end
 
   defp build_attrs(attrs, _, opts, :rel) do
-    if rel = Map.get(opts, :rel, "noopener noreferrer"),
-      do: [{:rel, rel} | attrs], else: attrs
+    if rel = Map.get(opts, :rel, "noopener noreferrer"), do: [{:rel, rel} | attrs], else: attrs
   end
+
   defp build_attrs(attrs, _, opts, :target) do
-    if Map.get(opts, :new_window, true),
-      do: [{:target, :_blank} | attrs], else: attrs
+    if Map.get(opts, :new_window, true), do: [{:target, :_blank} | attrs], else: attrs
   end
+
   defp build_attrs(attrs, _, opts, :class) do
-    if cls = Map.get(opts, :class, "auto-linker"),
-      do: [{:class, cls} | attrs], else: attrs
+    if cls = Map.get(opts, :class, "auto-linker"), do: [{:class, cls} | attrs], else: attrs
   end
+
   defp build_attrs(attrs, url, _opts, :scheme) do
     if String.starts_with?(url, ["http://", "https://"]),
-      do: [{:href, url} | attrs], else: [{:href, "http://" <> url} | attrs]
+      do: [{:href, url} | attrs],
+      else: [{:href, "http://" <> url} | attrs]
   end
 
   defp format_url(attrs, url, opts) do
@@ -45,6 +46,7 @@ defmodule AutoLinker.Builder do
       url
       |> strip_prefix(Map.get(opts, :strip_prefix, true))
       |> truncate(Map.get(opts, :truncate, false))
+
     attrs = format_attrs(attrs)
     "<a #{attrs}>" <> url <> "</a>"
   end
@@ -61,11 +63,13 @@ defmodule AutoLinker.Builder do
         "" -> ""
         attrs -> " " <> attrs
       end
+
     Regex.replace(~r/\[(.+?)\]\((.+?)\)/, text, "<a href='\\2'#{attrs}>\\1</a>")
   end
 
   defp truncate(url, false), do: url
   defp truncate(url, len) when len < 3, do: url
+
   defp truncate(url, len) do
     if String.length(url) > len, do: String.slice(url, 0, len - 2) <> "..", else: url
   end
@@ -75,13 +79,15 @@ defmodule AutoLinker.Builder do
     |> String.replace(~r/^https?:\/\//, "")
     |> String.replace(~r/^www\./, "")
   end
+
   defp strip_prefix(url, _), do: url
 
   def create_phone_link([], buffer, _) do
     buffer
   end
+
   def create_phone_link([h | t], buffer, opts) do
-    create_phone_link t, format_phone_link(h, buffer, opts), opts
+    create_phone_link(t, format_phone_link(h, buffer, opts), opts)
   end
 
   def format_phone_link([h | _], buffer, opts) do
@@ -89,6 +95,7 @@ defmodule AutoLinker.Builder do
       h
       |> String.replace(~r/[\.\+\- x\(\)]+/, "")
       |> format_phone_link(h, opts)
+
     # val = ~s'<a href="#" class="phone-number" data-phone="#{number}">#{h}</a>'
     String.replace(buffer, h, val)
   end
@@ -100,7 +107,9 @@ defmodule AutoLinker.Builder do
     attrs = format_attributes(opts[:attributes] || [])
     href = opts[:href] || "#"
 
-    ~s'<#{tag} href="#{href}" class="#{class}" #{data_phone}="#{number}"#{attrs}>#{original}</#{tag}>'
+    ~s'<#{tag} href="#{href}" class="#{class}" #{data_phone}="#{number}"#{attrs}>#{original}</#{
+      tag
+    }>'
   end
 
   defp format_attributes(attrs) do
diff --git a/lib/auto_linker/parser.ex b/lib/auto_linker/parser.ex
index 8a0522d..fec8f3c 100644
--- a/lib/auto_linker/parser.ex
+++ b/lib/auto_linker/parser.ex
@@ -43,20 +43,21 @@ defmodule AutoLinker.Parser do
       :auto_linker
       |> Application.get_env(:opts, [])
       |> Enum.into(%{})
-      |> Map.put(:attributes,
+      |> Map.put(
+        :attributes,
         Application.get_env(:auto_linker, :attributes, [])
       )
 
     opts =
-      Enum.reduce @default_opts, opts, fn opt, acc ->
+      Enum.reduce(@default_opts, opts, fn opt, acc ->
         if is_nil(opts[opt]) and is_nil(config[opt]) do
-          Map.put acc, opt, true
+          Map.put(acc, opt, true)
         else
           acc
         end
-      end
+      end)
 
-    do_parse text, Map.merge(config, opts)
+    do_parse(text, Map.merge(config, opts))
   end
 
   defp do_parse(text, %{phone: false} = opts), do: do_parse(text, Map.delete(opts, :phone))
@@ -85,11 +86,12 @@ defmodule AutoLinker.Parser do
 
   defp do_parse(text, _), do: text
 
-  defp do_parse("", _scheme, _opts ,{"", acc, _}, _handler),
+  defp do_parse("", _scheme, _opts, {"", acc, _}, _handler),
     do: acc
 
-  defp do_parse("", scheme, opts ,{buffer, acc, _}, handler),
+  defp do_parse("", scheme, opts, {buffer, acc, _}, handler),
     do: acc <> handler.(buffer, scheme, opts)
+
   defp do_parse("<a" <> text, scheme, opts, {buffer, acc, :parsing}, handler),
     do: do_parse(text, scheme, opts, {"", acc <> buffer <> "<a", :skip}, handler)
 
@@ -106,8 +108,14 @@ defmodule AutoLinker.Parser do
     do: do_parse(text, scheme, opts, {"", acc <> <<ch::8>>, {:attrs, level}}, handler)
 
   defp do_parse("</" <> text, scheme, opts, {buffer, acc, {:html, level}}, handler),
-    do: do_parse(text, scheme, opts,
-      {"", acc <> handler.(buffer, scheme, opts) <> "</", {:close, level}}, handler)
+    do:
+      do_parse(
+        text,
+        scheme,
+        opts,
+        {"", acc <> handler.(buffer, scheme, opts) <> "</", {:close, level}},
+        handler
+      )
 
   defp do_parse(">" <> text, scheme, opts, {buffer, acc, {:close, 1}}, handler),
     do: do_parse(text, scheme, opts, {"", acc <> buffer <> ">", :parsing}, handler)
@@ -126,16 +134,34 @@ defmodule AutoLinker.Parser do
     do: do_parse(text, scheme, opts, {buffer <> " ", acc, state}, handler)
 
   defp do_parse(" " <> text, scheme, opts, {buffer, acc, state}, handler),
-    do: do_parse(text, scheme, opts,
-      {"", acc <> handler.(buffer, scheme, opts) <> " ", state}, handler)
+    do:
+      do_parse(
+        text,
+        scheme,
+        opts,
+        {"", acc <> handler.(buffer, scheme, opts) <> " ", state},
+        handler
+      )
 
   defp do_parse("\n" <> text, scheme, opts, {buffer, acc, state}, handler),
-    do: do_parse(text, scheme, opts,
-      {"", acc <> handler.(buffer, scheme, opts) <> "\n", state}, handler)
+    do:
+      do_parse(
+        text,
+        scheme,
+        opts,
+        {"", acc <> handler.(buffer, scheme, opts) <> "\n", state},
+        handler
+      )
 
   defp do_parse(<<ch::8>>, scheme, opts, {buffer, acc, state}, handler),
-    do: do_parse("", scheme, opts,
-      {"", acc <> handler.(buffer <> <<ch::8>>, scheme, opts), state}, handler)
+    do:
+      do_parse(
+        "",
+        scheme,
+        opts,
+        {"", acc <> handler.(buffer <> <<ch::8>>, scheme, opts), state},
+        handler
+      )
 
   defp do_parse(<<ch::8>> <> text, scheme, opts, {buffer, acc, state}, handler),
     do: do_parse(text, scheme, opts, {buffer <> <<ch::8>>, acc, state}, handler)
@@ -154,24 +180,24 @@ defmodule AutoLinker.Parser do
 
   @doc false
   def is_url?(buffer, true) do
-    if Regex.match? @invalid_url, buffer do
+    if Regex.match?(@invalid_url, buffer) do
       false
     else
-      Regex.match? @match_scheme, buffer
+      Regex.match?(@match_scheme, buffer)
     end
   end
 
   def is_url?(buffer, _) do
-    if Regex.match? @invalid_url, buffer do
+    if Regex.match?(@invalid_url, buffer) do
       false
     else
-      Regex.match? @match_url, buffer
+      Regex.match?(@match_url, buffer)
     end
   end
 
   @doc false
   def match_phone(buffer) do
-    case Regex.scan @match_phone, buffer do
+    case Regex.scan(@match_phone, buffer) do
       [] -> nil
       other -> other
     end
@@ -180,13 +206,13 @@ defmodule AutoLinker.Parser do
   def link_phone(nil, buffer, _), do: buffer
 
   def link_phone(list, buffer, opts) do
-    Builder.create_phone_link list, buffer, opts
+    Builder.create_phone_link(list, buffer, opts)
   end
 
   @doc false
   def link_url(true, buffer, opts) do
     Builder.create_link(buffer, opts)
   end
-  def link_url(_, buffer, _opts), do: buffer
 
+  def link_url(_, buffer, _opts), do: buffer
 end
diff --git a/mix.exs b/mix.exs
index a25e7f6..572d1c9 100644
--- a/mix.exs
+++ b/mix.exs
@@ -8,8 +8,8 @@ defmodule AutoLinker.Mixfile do
       app: :auto_linker,
       version: @version,
       elixir: "~> 1.4",
-      build_embedded: Mix.env == :prod,
-      start_permanent: Mix.env == :prod,
+      build_embedded: Mix.env() == :prod,
+      start_permanent: Mix.env() == :prod,
       deps: deps(),
       docs: [extras: ["README.md"]],
       package: package(),
@@ -17,7 +17,7 @@ defmodule AutoLinker.Mixfile do
       description: """
       AutoLinker is a basic package for turning website names into links.
       """
-   ]
+    ]
   end
 
   # Configuration for the OTP application
@@ -30,14 +30,16 @@ defmodule AutoLinker.Mixfile do
   defp deps do
     [
       {:ex_doc, "~> 0.18", only: :dev},
-      {:earmark, "~> 1.2", only: :dev, override: true},
+      {:earmark, "~> 1.2", only: :dev, override: true}
     ]
   end
 
   defp package do
-    [ maintainers: ["Stephen Pallen"],
+    [
+      maintainers: ["Stephen Pallen"],
       licenses: ["MIT"],
-      links: %{ "Github" => "https://github.com/smpallen99/auto_linker" },
-      files: ~w(lib README.md mix.exs LICENSE)]
+      links: %{"Github" => "https://github.com/smpallen99/auto_linker"},
+      files: ~w(lib README.md mix.exs LICENSE)
+    ]
   end
 end
diff --git a/test/auto_linker_test.exs b/test/auto_linker_test.exs
index 1ffb972..ee1e7c0 100644
--- a/test/auto_linker_test.exs
+++ b/test/auto_linker_test.exs
@@ -2,31 +2,29 @@ defmodule AutoLinkerTest do
   use ExUnit.Case
   doctest AutoLinker
 
-
   test "phone number" do
     assert AutoLinker.link(", work (555) 555-5555", phone: true) ==
-      ~s{, work <a href="#" class="phone-number" data-phone="5555555555">(555) 555-5555</a>}
+             ~s{, work <a href="#" class="phone-number" data-phone="5555555555">(555) 555-5555</a>}
   end
 
   test "default link" do
     assert AutoLinker.link("google.com") ==
-      "<a href='http://google.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>google.com</a>"
+             "<a href='http://google.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>google.com</a>"
   end
 
   test "markdown" do
     assert AutoLinker.link("[google.com](http://google.com)", markdown: true) ==
-      "<a href='http://google.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>google.com</a>"
+             "<a href='http://google.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>google.com</a>"
   end
 
   test "does on link existing links" do
     assert AutoLinker.link("<a href='http://google.com'>google.com</a>") ==
-      "<a href='http://google.com'>google.com</a>"
+             "<a href='http://google.com'>google.com</a>"
   end
 
   test "phone number and markdown link" do
     assert AutoLinker.link("888 888-8888  [ab](a.com)", phone: true, markdown: true) ==
-      "<a href=\"#\" class=\"phone-number\" data-phone=\"8888888888\">888 888-8888</a>" <>
-      "  <a href='a.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>ab</a>"
+             "<a href=\"#\" class=\"phone-number\" data-phone=\"8888888888\">888 888-8888</a>" <>
+               "  <a href='a.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>ab</a>"
   end
-
 end
diff --git a/test/builder_test.exs b/test/builder_test.exs
index 7670749..114e260 100644
--- a/test/builder_test.exs
+++ b/test/builder_test.exs
@@ -8,17 +8,24 @@ defmodule AutoLinker.BuilderTest do
     test "finishes" do
       assert create_phone_link([], "", []) == ""
     end
+
     test "handles one link" do
       phrase = "my exten is x888. Call me."
-      expected = ~s'my exten is <a href="#" class="phone-number" data-phone="888">x888</a>. Call me.'
+
+      expected =
+        ~s'my exten is <a href="#" class="phone-number" data-phone="888">x888</a>. Call me.'
+
       assert create_phone_link([["x888", ""]], phrase, []) == expected
     end
+
     test "handles multiple links" do
       phrase = "555.555.5555 or (555) 888-8888"
-      expected = ~s'<a href="#" class="phone-number" data-phone="5555555555">555.555.5555</a> or ' <>
-        ~s'<a href="#" class="phone-number" data-phone="5558888888">(555) 888-8888</a>'
+
+      expected =
+        ~s'<a href="#" class="phone-number" data-phone="5555555555">555.555.5555</a> or ' <>
+          ~s'<a href="#" class="phone-number" data-phone="5558888888">(555) 888-8888</a>'
+
       assert create_phone_link([["555.555.5555", ""], ["(555) 888-8888"]], phrase, []) == expected
     end
   end
 end
-
diff --git a/test/parser_test.exs b/test/parser_test.exs
index 8749d82..a0cf533 100644
--- a/test/parser_test.exs
+++ b/test/parser_test.exs
@@ -11,18 +11,21 @@ defmodule AutoLinker.ParserTest do
         assert is_url?(url, true)
       end)
     end
+
     test "invalid scheme true" do
       invalid_scheme_urls()
       |> Enum.each(fn url ->
         refute is_url?(url, true)
       end)
     end
+
     test "valid scheme false" do
       valid_non_scheme_urls()
       |> Enum.each(fn url ->
         assert is_url?(url, false)
       end)
     end
+
     test "invalid scheme false" do
       invalid_non_scheme_urls()
       |> Enum.each(fn url ->
@@ -47,7 +50,6 @@ defmodule AutoLinker.ParserTest do
     end
   end
 
-
   describe "parse" do
     test "does not link attributes" do
       text = "Check out <a href='google.com'>google</a>"
@@ -61,7 +63,7 @@ defmodule AutoLinker.ParserTest do
     test "links url inside html" do
       text = "Check out <div class='section'>google.com</div>"
       expected = "Check out <div class='section'><a href='http://google.com'>google.com</a></div>"
-      assert parse(text, class: false, rel: false, new_window: false) ==  expected
+      assert parse(text, class: false, rel: false, new_window: false) == expected
     end
 
     test "excludes html with specified class" do
@@ -76,69 +78,73 @@ defmodule AutoLinker.ParserTest do
 
   def valid_number?(_, _), do: false
 
-  def valid_scheme_urls, do: [
-    "https://www.example.com",
-    "http://www2.example.com",
-    "http://home.example-site.com",
-    "http://blog.example.com",
-    "http://www.example.com/product",
-    "http://www.example.com/products?id=1&page=2",
-    "http://www.example.com#up",
-    "http://255.255.255.255",
-    "http://www.site.com:8008"
-  ]
+  def valid_scheme_urls,
+    do: [
+      "https://www.example.com",
+      "http://www2.example.com",
+      "http://home.example-site.com",
+      "http://blog.example.com",
+      "http://www.example.com/product",
+      "http://www.example.com/products?id=1&page=2",
+      "http://www.example.com#up",
+      "http://255.255.255.255",
+      "http://www.site.com:8008"
+    ]
 
-  def invalid_scheme_urls, do: [
-    "http://invalid.com/perl.cgi?key= | http://web-site.com/cgi-bin/perl.cgi?key1=value1&key2",
-  ]
+  def invalid_scheme_urls,
+    do: [
+      "http://invalid.com/perl.cgi?key= | http://web-site.com/cgi-bin/perl.cgi?key1=value1&key2"
+    ]
 
-  def valid_non_scheme_urls, do: [
-    "www.example.com",
-    "www2.example.com",
-    "www.example.com:2000",
-    "www.example.com?abc=1",
-    "example.example-site.com",
-    "example.com",
-    "example.ca",
-    "example.tv",
-    "example.com:999?one=one",
-    "255.255.255.255",
-    "255.255.255.255:3000?one=1&two=2",
-  ]
+  def valid_non_scheme_urls,
+    do: [
+      "www.example.com",
+      "www2.example.com",
+      "www.example.com:2000",
+      "www.example.com?abc=1",
+      "example.example-site.com",
+      "example.com",
+      "example.ca",
+      "example.tv",
+      "example.com:999?one=one",
+      "255.255.255.255",
+      "255.255.255.255:3000?one=1&two=2"
+    ]
 
-  def invalid_non_scheme_urls, do: [
-    "invalid.com/perl.cgi?key= | web-site.com/cgi-bin/perl.cgi?key1=value1&key2",
-    "invalid.",
-    "hi..there",
-    "555.555.5555"
-  ]
+  def invalid_non_scheme_urls,
+    do: [
+      "invalid.com/perl.cgi?key= | web-site.com/cgi-bin/perl.cgi?key1=value1&key2",
+      "invalid.",
+      "hi..there",
+      "555.555.5555"
+    ]
 
-  def valid_phone_nunbers, do: [
-    "x55",
-    "x555",
-    "x5555",
-    "x12345",
-    "+1 555 555-5555",
-    "555 555-5555",
-    "555.555.5555",
-    "613-555-5555",
-    "1 (555) 555-5555",
-    "(555) 555-5555",
-    "1.555.555.5555",
-    "800 555-5555",
-    "1.800.555.5555",
-    "1 (800) 555-5555",
-    "888 555-5555",
-    "887 555-5555",
-    "1-877-555-5555",
-    "1 800 710-5515"
-  ]
-
-  def invalid_phone_numbers, do: [
-    "5555",
-    "x5",
-    "(555) 555-55",
-  ]
+  def valid_phone_nunbers,
+    do: [
+      "x55",
+      "x555",
+      "x5555",
+      "x12345",
+      "+1 555 555-5555",
+      "555 555-5555",
+      "555.555.5555",
+      "613-555-5555",
+      "1 (555) 555-5555",
+      "(555) 555-5555",
+      "1.555.555.5555",
+      "800 555-5555",
+      "1.800.555.5555",
+      "1 (800) 555-5555",
+      "888 555-5555",
+      "887 555-5555",
+      "1-877-555-5555",
+      "1 800 710-5515"
+    ]
 
+  def invalid_phone_numbers,
+    do: [
+      "5555",
+      "x5",
+      "(555) 555-55"
+    ]
 end
-