style: reinstate parentheses for zero-arity functions

.credo.exs

@@ -102,7 +102,7 @@
           {Credo.Check.Readability.ModuleDoc, []},
           {Credo.Check.Readability.ModuleNames, []},
           {Credo.Check.Readability.ParenthesesInCondition, []},
-          {Credo.Check.Readability.ParenthesesOnZeroArityDefs, false},
+          {Credo.Check.Readability.ParenthesesOnZeroArityDefs, [parens: true]},
           {Credo.Check.Readability.PipeIntoAnonymousFunctions, []},
           {Credo.Check.Readability.PredicateFunctionNames, []},
           {Credo.Check.Readability.PreferImplicitTry, []},

lib/protox/define_message.ex

@@ -56,7 +56,7 @@ defmodule Protox.DefineMessage do
       def unknown_fields(msg), do: msg.unquote(unknown_fields)
 
       @spec unknown_fields_name() :: unquote(unknown_fields)
-      def unknown_fields_name, do: unquote(unknown_fields)
+      def unknown_fields_name(), do: unquote(unknown_fields)
 
       @spec clear_unknown_fields(struct) :: struct
       def clear_unknown_fields(msg), do: struct!(msg, [{unquote(unknown_fields), []}])

lib/protox/string.ex

@@ -3,7 +3,7 @@ defmodule Protox.String do
 
   if Mix.env() == :test do
     @max_size Bitwise.<<<(1, 20)
-    def max_size, do: @max_size
+    def max_size(), do: @max_size
   else
     # Reference: https://protobuf.dev/programming-guides/proto3/#scalar
     @max_size Bitwise.<<<(1, 32)

mix.exs

@@ -1,7 +1,7 @@
 defmodule Protox.Mixfile do
   use Mix.Project
 
-  def project do
+  def project() do
     [
       app: :protox,
       version: "2.0.0-dev",
@@ -25,13 +25,13 @@ defmodule Protox.Mixfile do
   defp elixirc_paths(:prod), do: ["lib"]
   defp elixirc_paths(_), do: ["lib", "conformance", "benchmark", "test/support"]
 
-  def application do
+  def application() do
     [
       extra_applications: [:benchee, :eex, :mix]
     ]
   end
 
-  defp deps do
+  defp deps() do
     [
       {:benchee, "~> 1.0", only: [:test, :dev], runtime: false},
       {:benchee_html, "~> 1.0", only: [:test, :dev], runtime: false},
@@ -79,13 +79,13 @@ defmodule Protox.Mixfile do
     end
   end
 
-  defp description do
+  defp description() do
     """
     A fast, easy to use and 100% conformant Elixir library for Google Protocol Buffers (aka protobuf)
     """
   end
 
-  def escript do
+  def escript() do
     [
       # do not start any application: avoid propcheck app to fail when running escript
       app: nil,
@@ -94,7 +94,7 @@ defmodule Protox.Mixfile do
     ]
   end
 
-  defp package do
+  defp package() do
     [
       name: :protox,
       files: ["lib", "mix.exs", "README*", "LICENSE"],
@@ -105,7 +105,7 @@ defmodule Protox.Mixfile do
     ]
   end
 
-  defp docs do
+  defp docs() do
     [
       main: "readme",
       extras: ["README.md", "documentation/reference.md"]