Fix some warnings

lib/rdf/serialization/parse_helper.ex

@@ -7,7 +7,7 @@ defmodule RDF.Serialization.ParseHelper do
   def rdf_type, do: @rdf_type
 
 
-  def to_uri_string({:iriref, line, value}), do: value |> iri_unescape
+  def to_uri_string({:iriref, _line, value}), do: value |> iri_unescape
 
   def to_uri({:iriref, line, value}) do
     case URI.parse(iri_unescape(value)) do
@@ -22,7 +22,7 @@ defmodule RDF.Serialization.ParseHelper do
     end
   end
 
-  def to_absolute_or_relative_uri({:iriref, line, value}) do
+  def to_absolute_or_relative_uri({:iriref, _line, value}) do
     case URI.parse(iri_unescape(value)) do
       uri = %URI{scheme: scheme} when not is_nil(scheme) ->
         if String.ends_with?(value, "#") do

lib/rdf/serializations/turtle_encoder.ex

@@ -4,7 +4,7 @@ defmodule RDF.Turtle.Encoder do
   use RDF.Serialization.Encoder
 
   alias RDF.Turtle.Encoder.State
-  alias RDF.{Literal, BlankNode, Description, List}
+  alias RDF.{Literal, BlankNode, Description}
 
   @indentation_char " "
   @indentation 4
@@ -117,7 +117,7 @@ defmodule RDF.Turtle.Encoder do
 
   defp predications(description, state, nesting) do
     description.predications
-    |> order_predications
+    |> order_predications()
     |> Enum.map(&predication(&1, state, nesting))
     |> Enum.join(" ;" <> newline_indent(nesting))
   end

lib/rdf/serializations/turtle_encoder_state.ex

@@ -1,7 +1,7 @@
 defmodule RDF.Turtle.Encoder.State do
   @moduledoc false
 
-  alias RDF.{Literal, BlankNode, Description, List}
+  alias RDF.{BlankNode, Description}
 
 
   def start_link(data, base, prefixes) do

lib/rdf/vocabulary_namespace.ex

@@ -129,8 +129,8 @@ defmodule RDF.Vocabulary.Namespace do
   defmacro define_vocab_terms(terms, base_uri) do
     terms
     |> Stream.filter(fn
-        {term, true}          -> valid_term?(term)
-        {term, original_term} -> true
+        {term, true} -> valid_term?(term)
+        {_, _}       -> true
        end)
     |> Stream.map(fn
         {term, true}          -> {term, term}
@@ -288,14 +288,12 @@ defmodule RDF.Vocabulary.Namespace do
   def invalid_terms, do: @invalid_terms
 
   defp validate_terms!(terms) do
-    aliased_terms = aliased_terms(terms)
-    terms
-    |> Enum.filter_map(
-         fn {term, _} ->
-           not term in aliased_terms and not valid_term?(term)
-         end,
-         fn {term, _} -> term end)
-    |> handle_invalid_terms!
+    with aliased_terms = aliased_terms(terms) do
+      for {term, _} <- terms, not term in aliased_terms and not valid_term?(term) do
+        term
+      end
+      |> handle_invalid_terms!
+    end
 
     terms
   end
@@ -331,12 +329,10 @@ defmodule RDF.Vocabulary.Namespace do
   end
 
   defp detect_invalid_characters(terms) do
-    aliased_terms = aliased_terms(terms)
-    Enum.filter_map terms,
-      fn {term, _} ->
-        not term in aliased_terms and not valid_characters?(term)
-      end,
-      fn {term, _} -> term end
+    with aliased_terms = aliased_terms(terms) do
+      for {term, _} <- terms, not term in aliased_terms and not valid_characters?(term),
+        do: term
+    end
   end
 
   defp handle_invalid_characters([], _, terms), do: terms