Implementing color change in the selected item from ListInput

src/Inquirer/Console/ConsoleManager.cs

@@ -24,6 +24,21 @@ public int[] Render(string[] content, string[] bottomContent)
             return new [] { content.Length, bottomContent.Length };
         }
 
+        public int[] Render(ConsoleMessage[] content, ConsoleMessage[] bottomContent)
+        {
+            content.ToList().ForEach(item =>
+            {
+                if (item.ConsoleColor.HasValue)
+                    console.ForegroundColor = item.ConsoleColor.Value;
+
+                console.WriteLine(item.Message);
+            });
+            Newline();
+            console.ResetColor();
+            bottomContent.ToList().ForEach(item => console.WriteLine(item.Message));
+            console.CursorTop = console.CursorTop - (bottomContent.Length + 1);
+            return new[] { content.Length, bottomContent.Length };
+        }
 
         public void Clean(int initialPos, int endPos)
         {

src/Inquirer/Console/ConsoleMessage.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace InquirerCore.Console
+{
+    public class ConsoleMessage
+    {
+        public ConsoleMessage(string message)
+        {
+            Message = message;
+        }
+
+        public ConsoleMessage(string message, ConsoleColor consoleColor)
+        {
+            Message = message;
+            ConsoleColor = consoleColor;
+        }
+
+        public string Message { get; private set; }
+
+        public ConsoleColor? ConsoleColor { get; private set; }
+
+        public void SetMessage(string message)
+            => Message = message;
+
+        public void SetConsoleColor(ConsoleColor consoleColor)
+            => ConsoleColor = consoleColor;
+    }
+}

src/Inquirer/Console/IConsole.cs

@@ -15,5 +15,7 @@ public interface IConsole
         int CursorTop { get; set; }
         int WindowWidth { get; set; }
         bool KeyAvailable { get; }
+        ConsoleColor ForegroundColor { get; set; }
+        void ResetColor();
     }
 }

src/Inquirer/Prompts/IScreenManager.cs

@@ -7,6 +7,7 @@ public interface IScreenManager
     {
         int[,] RenderMultipleMessages(string[] messages);
         int[] Render(string[] content, string[] bottomContent);
+        int[] Render(ConsoleMessage[] content, ConsoleMessage[] bottomContent);
         void Clean(int initialPos, int endPos);
         string ReadLine();
         IInputObservable GetInputObservable();

src/Inquirer/Prompts/ListInput.cs

@@ -1,4 +1,5 @@
-using System;
+using InquirerCore.Console;
+using System;
 using System.Collections.Generic;
 using System.Reactive.Linq;
 using System.Text;
@@ -57,7 +58,24 @@ public override string[] GetQuestion()
 
         public override int[] Render()
         {
-            return consoleRender.Render(GetQuestion(), new string[] {});
+            ConsoleMessage[] messages = ProcessInputMessages(GetQuestion());
+            return consoleRender.Render(messages, new ConsoleMessage[] { });
+        }
+
+        public ConsoleMessage[] ProcessInputMessages(string[] questions)
+        {
+            var messages = new ConsoleMessage[questions.Length];
+
+            for (int i = 0; i < questions.Length; i++)
+            {
+                messages[i] = new ConsoleMessage(questions[i]);
+                if ((selectedOption + 1) == i)
+                    messages[i].SetConsoleColor(ConsoleColor.Cyan);
+                else
+                    messages[i].SetConsoleColor(ConsoleColor.Gray);
+            }
+
+            return messages;
         }
     }
 }

test/InquirerUnitTest/InputListUnitTest.cs

@@ -62,8 +62,39 @@ public void ShouldCallConsoleWriteLine()
             var input = new ListInput(name, message, new string[] { "option1", "option2" }, consoleRender);
             input.Render();
 
-            consoleRender.Received().Render(Arg.Any<string[]>(), Arg.Any<string[]>());
+            consoleRender.Received().Render(Arg.Any<ConsoleMessage[]>(), Arg.Any<ConsoleMessage[]>());
         }
 
+        [Fact]
+        public void FirstQuestionShoulBeADifferentColor()
+        {
+            var message = "Which option?";
+            var name = "option";
+            var options = new string[] { "option1", "option2" };
+            var consoleRender = Substitute.For<IScreenManager>();
+            var input = new ListInput(name, message, options, consoleRender);
+
+            var questions = input.GetQuestion();
+            var inputMessages = input.ProcessInputMessages(questions);
+
+            inputMessages[1].Message.Should().Be("> option1");
+            inputMessages[1].ConsoleColor.Should().Be(ConsoleColor.Cyan);
+        }
+
+        [Fact]
+        public void SecondQuestionNotShoulBeADifferentColor()
+        {
+            var message = "Which option?";
+            var name = "Name";
+            var options = new string[] { "option1", "option2" };
+            var consoleRender = Substitute.For<IScreenManager>();
+            var input = new ListInput(name, message, options, consoleRender);
+
+            var questions = input.GetQuestion();
+            var inputMessages = input.ProcessInputMessages(questions);
+
+            inputMessages[2].Message.Should().Be("option2");
+            inputMessages[2].ConsoleColor.Should().NotBe(ConsoleColor.Cyan);
+        }
     }
 }