Remove most Elixir warnings

lib/ejabberd/config/config.ex

@@ -23,7 +23,7 @@ defmodule Ejabberd.Config do
   # Could be also possible to interrupt the compilation&execution by throwing
   # an exception if necessary.
   def __before_compile__(_env) do
-    get_modules_parsed_in_order
+    get_modules_parsed_in_order()
     |> EjabberdModule.validate
     |> EjabberdLogger.log_errors
   end
@@ -48,7 +48,7 @@ defmodule Ejabberd.Config do
   Returns a list with all the opts, formatted for ejabberd.
   """
   def get_ejabberd_opts do
-    get_general_opts
+    get_general_opts()
     |> Dict.put(:modules, get_modules_parsed_in_order())
     |> Dict.put(:listeners, get_listeners_parsed_in_order())
     |> Ejabberd.Config.OptsFormatter.format_opts_for_ejabberd

lib/ejabberd/config/ejabberd_module.ex

@@ -12,7 +12,6 @@ defmodule Ejabberd.Config.EjabberdModule do
   defstruct [:module, :attrs]
 
   alias Ejabberd.Config.EjabberdModule
-  alias Ejabberd.Config.Attr
   alias Ejabberd.Config.Validation
 
   @doc """

lib/ejabberd/config/logger/ejabberd_logger.ex

@@ -21,7 +21,7 @@ defmodule Ejabberd.Config.EjabberdLogger do
   defp do_log_errors({:attribute, errors}), do: Enum.each errors, &log_attribute_error/1
   defp do_log_errors({:dependency, errors}), do: Enum.each errors, &log_dependency_error/1
 
-  defp log_attribute_error({{attr_name, val}, :attr_not_supported}), do:
+  defp log_attribute_error({{attr_name, _val}, :attr_not_supported}), do:
     IO.puts "[ WARN ] Annotation @#{attr_name} is not supported."
 
   defp log_attribute_error({{attr_name, val}, :type_not_supported}), do:

lib/ejabberd/config/validator/validation.ex

@@ -7,9 +7,7 @@ defmodule Ejabberd.Config.Validation do
   @type mod_validation_result :: {:ok, EjabberdModule.t} | {:error, EjabberdModule.t, map}
 
   alias Ejabberd.Config.EjabberdModule
-  alias Ejabberd.Config.Attr
   alias Ejabberd.Config.Validator
-  alias Ejabberd.Config.ValidatorUtility
 
   @doc """
   Given a module or a list of modules it runs validators on them

lib/ejabberd/config/validator/validator_attrs.ex

@@ -18,7 +18,7 @@ defmodule Ejabberd.Config.Validator.Attrs do
   def validate({modules, mod, errors}) do
     errors = Enum.reduce mod.attrs, errors, fn(attr, err) ->
       case Attr.validate(attr) do
-        {:ok, attr} -> err
+        {:ok, _attr} -> err
         {:error, attr, cause} -> put_error(err, :attribute, {attr, cause})
       end
     end

lib/mix/tasks/deps.tree.ex

@@ -40,7 +40,7 @@ defmodule Mix.Tasks.Ejabberd.Deps.Tree do
     end
   end
 
-  defp build_dependency_tree(mods, mod, []), do: %{module: mod, dependency: []}
+  defp build_dependency_tree(_mods, mod, []), do: %{module: mod, dependency: []}
   defp build_dependency_tree(mods, mod, deps) when is_list(deps) do
     dependencies = Enum.map deps, fn dep ->
       dep_deps = get_dependencies_of_mod(mods, dep)
@@ -65,7 +65,7 @@ defmodule Mix.Tasks.Ejabberd.Deps.Tree do
 
   defp keep_only_mods_not_used_as_dep(mods, mods_used_as_dep) do
     Enum.filter mods, fn %{module: mod} ->
-      not mod in mods_used_as_dep
+      mod not in mods_used_as_dep
     end
   end
 

lib/mod_presence_demo.ex

@@ -17,4 +17,13 @@ defmodule ModPresenceDemo do
     info('Receive presence for #{user}')
     :none
   end
+
+  def depends(_host, _opts) do
+    []
+  end
+
+  def mod_options(_host) do
+    []
+  end
+  
 end