diff --git a/lib/mix/lib/mix/tasks/deps.compile.ex b/lib/mix/lib/mix/tasks/deps.compile.ex
index 0d2658a000a..93d99373f26 100644
--- a/lib/mix/lib/mix/tasks/deps.compile.ex
+++ b/lib/mix/lib/mix/tasks/deps.compile.ex
@@ -30,36 +30,36 @@ defmodule Mix.Tasks.Deps.Compile do
   `b` is included in the compilation step, pass `--include-children`.
   """
 
-  import Mix.Dep, only: [loaded: 1, available?: 1, loaded_by_name: 2,
-                         make?: 1, mix?: 1]
+  import Mix.Dep, only: [loaded: 1, available?: 1, loaded_by_name: 2, make?: 1, mix?: 1]
 
   @switches [include_children: :boolean, force: :boolean]
 
-  @spec run(OptionParser.argv) :: :ok
+  @spec run(OptionParser.argv()) :: :ok
   def run(args) do
     unless "--no-archives-check" in args do
-      Mix.Task.run "archive.check", args
+      Mix.Task.run("archive.check", args)
     end
 
-    Mix.Project.get!
+    Mix.Project.get!()
 
     case OptionParser.parse(args, switches: @switches) do
       {opts, [], _} ->
         # Because this command may be invoked explicitly with
         # deps.compile, we simply try to compile any available
         # dependency.
-        compile(Enum.filter(loaded(env: Mix.env), &available?/1), opts)
+        compile(Enum.filter(loaded(env: Mix.env()), &available?/1), opts)
+
       {opts, tail, _} ->
-        compile(loaded_by_name(tail, [env: Mix.env] ++ opts), opts)
+        compile(loaded_by_name(tail, [env: Mix.env()] ++ opts), opts)
     end
   end
 
   @doc false
   def compile(deps, options \\ []) do
-    shell  = Mix.shell
-    config = Mix.Project.deps_config
+    shell = Mix.shell()
+    config = Mix.Project.deps_config()
 
-    Mix.Task.run "deps.precompile"
+    Mix.Task.run("deps.precompile")
 
     compiled =
       Enum.map(deps, fn %Mix.Dep{app: app, status: status, opts: opts, scm: scm} = dep ->
@@ -67,22 +67,31 @@ defmodule Mix.Tasks.Deps.Compile do
 
         maybe_clean(app, options)
 
-        compiled? = cond do
-          not is_nil(opts[:compile]) ->
-            do_compile dep, config
-          mix?(dep) ->
-            do_mix dep, config
-          make?(dep) ->
-            do_make dep, config
-          dep.manager == :rebar ->
-            do_rebar dep, config
-          dep.manager == :rebar3 ->
-            do_rebar3 dep, config
-          true ->
-            shell.error "Could not compile #{inspect app}, no \"mix.exs\", \"rebar.config\" or \"Makefile\" " <>
-              "(pass :compile as an option to customize compilation, set it to \"false\" to do nothing)"
-            false
-        end
+        compiled? =
+          cond do
+            not is_nil(opts[:compile]) ->
+              do_compile(dep, config)
+
+            mix?(dep) ->
+              do_mix(dep, config)
+
+            make?(dep) ->
+              do_make(dep, config)
+
+            dep.manager == :rebar ->
+              do_rebar(dep, config)
+
+            dep.manager == :rebar3 ->
+              do_rebar3(dep, config)
+
+            true ->
+              shell.error(
+                "Could not compile #{inspect(app)}, no \"mix.exs\", \"rebar.config\" or \"Makefile\" " <>
+                  "(pass :compile as an option to customize compilation, set it to \"false\" to do nothing)"
+              )
+
+              false
+          end
 
         unless mix?(dep), do: build_structure(dep, config)
         # We should touch fetchable dependencies even if they
@@ -92,12 +101,12 @@ defmodule Mix.Tasks.Deps.Compile do
         compiled? and fetchable?
       end)
 
-    if true in compiled, do: Mix.Dep.Lock.touch_manifest, else: :ok
+    if true in compiled, do: Mix.Dep.Lock.touch_manifest(), else: :ok
   end
 
   defp maybe_clean(app, opts) do
     if Keyword.get(opts, :force, false) do
-      File.rm_rf! Path.join [Mix.Project.build_path, "lib", Atom.to_string(app)]
+      File.rm_rf!(Path.join([Mix.Project.build_path(), "lib", Atom.to_string(app)]))
     end
   end
 
@@ -112,8 +121,10 @@ defmodule Mix.Tasks.Deps.Compile do
   end
 
   defp check_unavailable!(app, {:unavailable, _}) do
-    Mix.raise "Cannot compile dependency #{inspect app} because " <>
-      "it isn't available, run \"mix deps.get\" first"
+    Mix.raise(
+      "Cannot compile dependency #{inspect(app)} because " <>
+        "it isn't available, run \"mix deps.get\" first"
+    )
   end
 
   defp check_unavailable!(_, _) do
@@ -121,56 +132,69 @@ defmodule Mix.Tasks.Deps.Compile do
   end
 
   defp do_mix(dep, _config) do
-    Mix.Dep.in_dependency dep, fn _ ->
-      if req = old_elixir_req(Mix.Project.config) do
-        Mix.shell.error "warning: the dependency #{inspect dep.app} requires Elixir #{inspect req} " <>
-                        "but you are running on v#{System.version}"
+    Mix.Dep.in_dependency(dep, fn _ ->
+      if req = old_elixir_req(Mix.Project.config()) do
+        Mix.shell().error(
+          "warning: the dependency #{inspect(dep.app)} requires Elixir #{inspect(req)} " <>
+            "but you are running on v#{System.version()}"
+        )
       end
 
       # Force recompilation on compile status
       if dep.status == :compile do
-        Mix.Dep.Lock.touch_manifest
+        Mix.Dep.Lock.touch_manifest()
       end
 
       try do
-        res = Mix.Task.run("compile", ["--no-deps", "--no-archives-check",
-                                       "--no-elixir-version-check", "--no-warnings-as-errors"])
+        options = [
+          "--no-deps",
+          "--no-archives-check",
+          "--no-elixir-version-check",
+          "--no-warnings-as-errors"
+        ]
+
+        res = Mix.Task.run("compile", options)
+
         match?({:ok, _}, res)
       catch
         kind, reason ->
-          stacktrace = System.stacktrace
+          stacktrace = System.stacktrace()
           app = dep.app
-          Mix.shell.error "could not compile dependency #{inspect app}, \"mix compile\" failed. " <>
-            "You can recompile this dependency with \"mix deps.compile #{app}\", update it " <>
-            "with \"mix deps.update #{app}\" or clean it with \"mix deps.clean #{app}\""
+
+          Mix.shell().error(
+            "could not compile dependency #{inspect(app)}, \"mix compile\" failed. " <>
+              "You can recompile this dependency with \"mix deps.compile #{app}\", update it " <>
+              "with \"mix deps.update #{app}\" or clean it with \"mix deps.clean #{app}\""
+          )
+
           :erlang.raise(kind, reason, stacktrace)
       end
-    end
+    end)
   end
 
   defp do_rebar(dep, config) do
     lib_path = Path.join(config[:env_path], "lib")
-    cmd      = "#{rebar_cmd(dep)} compile skip_deps=true deps_dir=#{inspect lib_path}"
-    do_command dep, config, cmd, false
+    cmd = "#{rebar_cmd(dep)} compile skip_deps=true deps_dir=#{inspect(lib_path)}"
+    do_command(dep, config, cmd, false)
   end
 
   defp do_rebar3(%Mix.Dep{opts: opts} = dep, config) do
-    dep_path    = opts[:build]
+    dep_path = opts[:build]
     config_path = Path.join(dep_path, "mix.rebar.config")
-    lib_path    = Path.join(config[:env_path], "lib/*/ebin")
+    lib_path = Path.join(config[:env_path], "lib/*/ebin")
 
     env = [{"REBAR_CONFIG", config_path}, {"TERM", "dumb"}]
-    cmd = "#{rebar_cmd(dep)} bare compile --paths #{inspect lib_path}"
+    cmd = "#{rebar_cmd(dep)} bare compile --paths #{inspect(lib_path)}"
 
     File.mkdir_p!(dep_path)
     File.write!(config_path, rebar_config(dep))
-    do_command dep, config, cmd, false, env
+    do_command(dep, config, cmd, false, env)
   end
 
   defp rebar_config(dep) do
     dep.extra
-    |> Mix.Rebar.dependency_config
-    |> Mix.Rebar.serialize_config
+    |> Mix.Rebar.dependency_config()
+    |> Mix.Rebar.serialize_config()
   end
 
   defp rebar_cmd(%Mix.Dep{manager: manager} = dep) do
@@ -178,17 +202,28 @@ defmodule Mix.Tasks.Deps.Compile do
   end
 
   defp handle_rebar_not_found(%Mix.Dep{app: app, manager: manager}) do
-    shell = Mix.shell
-    shell.info "Could not find \"#{manager}\", which is needed to build dependency #{inspect app}"
-    shell.info "I can install a local copy which is just used by Mix"
+    shell = Mix.shell()
+
+    shell.info(
+      "Could not find \"#{manager}\", which is needed to build dependency #{inspect(app)}"
+    )
 
-    unless shell.yes?("Shall I install #{manager}? (if running non-interactively, use \"mix local.rebar --force\")") do
-      Mix.raise "Could not find \"#{manager}\" to compile " <>
-        "dependency #{inspect app}, please ensure \"#{manager}\" is available"
+    shell.info("I can install a local copy which is just used by Mix")
+
+    install_question =
+      "Shall I install #{manager}? (if running non-interactively, " <>
+        "use \"mix local.rebar --force\")"
+
+    unless shell.yes?(install_question) do
+      error_message =
+        "Could not find \"#{manager}\" to compile " <>
+          "dependency #{inspect(app)}, please ensure \"#{manager}\" is available"
+
+      Mix.raise(error_message)
     end
 
     (Mix.Tasks.Local.Rebar.run([]) && Mix.Rebar.local_rebar_cmd(manager)) ||
-      Mix.raise "\"#{manager}\" installation failed"
+      Mix.raise("\"#{manager}\" installation failed")
   end
 
   defp do_make(dep, config) do
@@ -200,11 +235,13 @@ defmodule Mix.Tasks.Deps.Compile do
     makefile_win? = makefile_win?(dep)
 
     command =
-      case :os.type do
+      case :os.type() do
         {:win32, _} when makefile_win? ->
           "nmake /F Makefile.win"
+
         {:unix, type} when type in [:freebsd, :openbsd] ->
           "gmake"
+
         _ ->
           "make"
       end
@@ -227,34 +264,40 @@ defmodule Mix.Tasks.Deps.Compile do
   defp do_command(%Mix.Dep{app: app, opts: opts}, config, command, print_app?, env \\ []) do
     File.cd!(opts[:dest], fn ->
       env = [{"ERL_LIBS", Path.join(config[:env_path], "lib")}] ++ env
+
       if Mix.Shell.cmd(command, env: env, into: %Mix.Shell{print_app?: print_app?}) != 0 do
-        Mix.raise "Could not compile dependency #{inspect app}, \"#{command}\" command failed. " <>
-          "You can recompile this dependency with \"mix deps.compile #{app}\", update it " <>
-          "with \"mix deps.update #{app}\" or clean it with \"mix deps.clean #{app}\""
+        Mix.raise(
+          "Could not compile dependency #{inspect(app)}, \"#{command}\" command failed. " <>
+            "You can recompile this dependency with \"mix deps.compile #{app}\", update it " <>
+            "with \"mix deps.update #{app}\" or clean it with \"mix deps.clean #{app}\""
+        )
       end
     end)
+
     true
   end
 
   defp build_structure(%Mix.Dep{opts: opts} = dep, config) do
     build_path = Path.dirname(opts[:build])
-    Enum.each Mix.Dep.source_paths(dep), fn {source, base} ->
+
+    Enum.each(Mix.Dep.source_paths(dep), fn {source, base} ->
       app = Path.join(build_path, base)
       build_structure(source, app, config)
       Code.prepend_path(Path.join(app, "ebin"))
-    end
+    end)
   end
 
   defp build_structure(dest, build, config) do
-    File.cd! dest, fn ->
+    File.cd!(dest, fn ->
       config = Keyword.put(config, :app_path, build)
       Mix.Project.build_structure(config, symlink_ebin: true)
-    end
+    end)
   end
 
   defp old_elixir_req(config) do
     req = config[:elixir]
-    if req && not Version.match?(System.version, req) do
+
+    if req && not Version.match?(System.version(), req) do
       req
     end
   end