Add list conversions

lib/tty/option/conversions.rb

@@ -101,6 +101,18 @@ def self.raise_invalid_argument(conv_name, val)
           pairs
         end
       end
+
+      conversions.keys.each do |type|
+        next if type =~ /list|array/
+
+        [:"#{type}_list", :"#{type}_array", :"#{type}s"].each do |new_type|
+          convert new_type do |val|
+            conversions[:list].(val).map do |obj|
+              conversions[type].(obj)
+            end
+          end
+        end
+      end
     end # Conversions
   end # Option
 end # TTY

spec/unit/conversions_spec.rb

@@ -158,6 +158,21 @@
         expect(described_class[:list].(input)).to eq(obj)
       end
     end
+
+    {
+      [:int_list, "1,2,3"] => [1, 2, 3],
+      [:ints, "1,2,3"] => [1, 2, 3],
+      [:float_list, "1,2,3"] => [1.0, 2.0, 3.0],
+      [:floats, "1,2,3"] => [1.0, 2.0, 3.0],
+      [:bool_list, "t,t,f"] => [true, true, false],
+      [:bools, "t,t,f"] => [true, true, false],
+      [:symbols, "a,b,c"] => [:a, :b, :c],
+      [:regexps, "a,b,c"] => [/a/, /b/, /c/]
+    }.each do |(type, input), obj|
+      it "converts #{input.inspect} to #{obj.inspect}" do
+        expect(described_class[type].(input)).to eq(obj)
+      end
+    end
   end
 
   context ":map" do