diff --git a/lib/mix/tasks/docs.ex b/lib/mix/tasks/docs.ex
index 4ce5a44cb..cd356f7f4 100644
--- a/lib/mix/tasks/docs.ex
+++ b/lib/mix/tasks/docs.ex
@@ -239,30 +239,22 @@ defmodule Mix.Tasks.Docs do
   @doc false
   def run(args, config \\ Mix.Project.config(), generator \\ &ExDoc.generate_docs/3) do
     Mix.Task.run("compile")
+
     {cli_opts, args, _} = OptionParser.parse(args, aliases: @aliases, switches: @switches)
 
-    if args != [] do
-      Mix.raise("Extraneous arguments on the command line")
-    end
+    if args != [], do: Mix.raise("Extraneous arguments on the command line")
 
     project = to_string(config[:name] || config[:app])
     version = config[:version] || "dev"
-
-    options =
-      config
-      |> get_docs_opts()
-      |> Keyword.merge(cli_opts)
-      # accepted at root level config
-      |> normalize_source_url(config)
-      # accepted at root level config
-      |> normalize_homepage_url(config)
-      |> normalize_source_beam(config)
-      |> normalize_main()
-      |> normalize_deps()
+    options = get_docs_opts(config, cli_opts)
+    # def'd after `get_formatters/1`
 
     for formatter <- get_formatters(options) do
       index = generator.(project, version, Keyword.put(options, :formatter, formatter))
-      log(index)
+
+      Mix.shell().info([:green, "Docs successfully generated."])
+      Mix.shell().info([:green, "View them at #{inspect(index)}."])
+
       index
     end
   end
@@ -274,7 +266,17 @@ defmodule Mix.Tasks.Docs do
     end
   end
 
-  defp get_docs_opts(config) do
+  # Table of Contents:
+  #
+  # config
+  # |> get_docs_opts()
+  # |> Keyword.merge(cli_opts)
+  # |> normalize_urls(config, [:source_url, :homepage_url]) # accepted at root level config
+  # |> normalize_source_beam(config)
+  # |> normalize_main()
+  # |> normalize_deps()
+  #
+  defp get_docs_opts(config, cli_opts) do
     docs = config[:docs]
 
     cond do
@@ -282,81 +284,68 @@ defmodule Mix.Tasks.Docs do
       is_nil(docs) -> []
       true -> docs
     end
+    |> Keyword.merge(cli_opts)
+    # accepted at root level config
+    |> normalize_urls(config, [:source_url, :homepage_url])
   end
 
-  defp log(index) do
-    Mix.shell().info([:green, "Docs successfully generated."])
-    Mix.shell().info([:green, "View them at #{inspect(index)}."])
+  defp normalize_urls(options, config, keys) do
+    Enum.reduce(keys, options, fn key, options_ ->
+      case Keyword.get(config, key) do
+        nil -> options_
+        value -> Keyword.put(options_, key, value)
+      end
+    end)
+    |> normalize_source_beam(config)
   end
 
-  defp normalize_source_url(options, config) do
-    if source_url = config[:source_url] do
-      Keyword.put(options, :source_url, source_url)
-    else
-      options
-    end
-  end
+  def normalize_source_beam(options, config) do
+    source_beam =
+      case Mix.Project.umbrella?(config) do
+        false ->
+          Mix.Project.compile_path()
 
-  defp normalize_homepage_url(options, config) do
-    if homepage_url = config[:homepage_url] do
-      Keyword.put(options, :homepage_url, homepage_url)
-    else
-      options
-    end
-  end
+        true ->
+          ignored_apps = Keyword.get(options, :ignore_apps, [])
+          build = Mix.Project.build_path()
 
-  defp normalize_source_beam(options, config) do
-    compile_path =
-      if Mix.Project.umbrella?(config) do
-        umbrella_compile_paths(Keyword.get(options, :ignore_apps, []))
-      else
-        Mix.Project.compile_path()
+          for {app, _} <- Mix.Project.apps_paths(),
+              app not in ignored_apps,
+              do: Path.join([build, "lib", Atom.to_string(app), "ebin"])
       end
 
-    Keyword.put_new(options, :source_beam, compile_path)
-  end
-
-  defp umbrella_compile_paths(ignored_apps) do
-    build = Mix.Project.build_path()
-
-    for {app, _} <- Mix.Project.apps_paths(),
-        app not in ignored_apps do
-      Path.join([build, "lib", Atom.to_string(app), "ebin"])
-    end
+    Keyword.put_new(options, :source_beam, source_beam)
+    |> normalize_main()
   end
 
   defp normalize_main(options) do
     main = options[:main]
 
     cond do
-      is_nil(main) ->
-        Keyword.delete(options, :main)
-
-      is_atom(main) ->
-        Keyword.put(options, :main, inspect(main))
-
-      is_binary(main) ->
-        options
+      is_nil(main) -> Keyword.delete(options, :main)
+      is_atom(main) -> Keyword.put(options, :main, inspect(main))
+      is_binary(main) -> options
     end
+    |> normalize_deps()
   end
 
   defp normalize_deps(options) do
-    user_deps = Keyword.get(options, :deps, [])
-
     deps =
-      for {app, doc} <- Keyword.merge(get_deps(), user_deps),
+      for {app, doc} <- Keyword.merge(get_deps(), Keyword.get(options, :deps, [])),
           lib_dir = :code.lib_dir(app),
           is_list(lib_dir),
           do: {List.to_string(lib_dir), doc}
 
     Keyword.put(options, :deps, deps)
+    # call stack returns to `run/1`
   end
 
-  defp get_deps do
-    for {key, _} <- Mix.Project.deps_paths(),
+  defp get_deps,
+    do:
+      for(
+        {key, _} <- Mix.Project.deps_paths(),
         _ = Application.load(key),
-        vsn = Application.spec(key, :vsn) do
-      {key, "https://hexdocs.pm/#{key}/#{vsn}/"}
-    end
-  end
+        vsn = Application.spec(key, :vsn),
+        do: {key, "https://hexdocs.pm/#{key}/#{vsn}/"}
+      )
 end