roll command is now object-oriented and pretty-prints output

Command.cs

@@ -8,54 +8,14 @@ namespace Dungeoneer {
 			//	don't do anything with empty expressions
 			if(args.Count == 0)
 				return;
-			var expression = "";
 
-			var diePattern = new Regex(@"\d+d\d+");
+			//	create new parsed expression object and pretty-print
-
+			var roll = new RollExpression(args);
-			//	reassemble split args and substitute die notation
+			var result = roll.Result;
-			foreach(string arg in args) {
+			if(result == null)
-				string part;
-
-				var dieCheck = diePattern.Match(arg);
-				if(dieCheck.Success) {
-					var parts = arg.Split('d');
-					var first = parts[0];
-					var second = parts[1];
-
-					int count;
-					int sides;
-					try {
-						count = int.Parse(first);
-						sides = int.Parse(second);
-					} catch {
-						Console.WriteLine("'{arg}' is not a valid dice expression");
-						return;
-					}
-
-					var rolls = "( ";
-					for(int i = 0; i < count; i++) {
-						string result;
-						var roll = Util.Roll(sides);
-						if(i < count - 1)
-							result = $"{roll} + ";
-						else
-							result = $"{roll} ";
-						rolls += result;
-					}
-					rolls += ")";
-					part = rolls;
-				} else
-					part = arg;
-				expression += $"{part} ";
-			}
-
-			dynamic output;
-			try { output = Scripting.Expr($"eval('{expression}')"); }
-			catch {
 				Console.WriteLine("invalid expression");
-				return;
+			else
-			}
+				Console.WriteLine($"{roll.Print}\n => {result}");
-			Console.WriteLine($"{expression}\n=> {output}");
 		}
 
 

Format.cs

@@ -0,0 +1,16 @@
+
+namespace Dungeoneer {
+
+	public static class Format {
+
+		public const string Reset	= "\x1b[0m";
+
+		public const string Black	= "\x1b[30m";
+		public const string Red		= "\x1b[31m";
+		public const string Green	= "\x1b[32m";
+		public const string Yellow	= "\x1b[33m";
+		public const string Blue	= "\x1b[34m";
+	}
+
+}
+

Util.cs

@@ -1,4 +1,5 @@
 using System.Security.Cryptography;
+using System.Text.RegularExpressions;
 
 namespace Dungeoneer {
 
@@ -10,5 +11,57 @@ namespace Dungeoneer {
 
 	}
 
+	public class RollExpression {
+		private IList<string> Parts;
+		public string Print { get; private set; }
+		public string Expression { get; private set; }
+		public dynamic Result {
+			get {
+				try { return Scripting.Expr($"eval('{Expression}')"); }
+				catch { return null; }
+			}
+		}
+
+		private const string DieFormat = "\x1b[34;1m";
+		private static readonly Regex DiePattern = new Regex(@"(\d+)d(\d+)");
+
+		public RollExpression(IList<string> parts) {
+			this.Parts = parts;
+			this.Print = "";
+			this.Expression = "";
+
+			//	build expression from string parts
+			foreach(string piece in Parts) {
+				//	die expression substitution
+				var dieCheck = DiePattern.Match(piece);
+				if(dieCheck.Success) {
+					//	get /(d+)/ capture group values
+					var count = int.Parse(dieCheck.Groups[1].Value);
+					var sides = int.Parse(dieCheck.Groups[2].Value);
+
+					//	and build roll outcomes
+					this.Print += $"{DieFormat}( ";
+					this.Expression += "( ";
+					for(int i = 0; i < count; i++) {
+						var roll = Util.Roll(sides);
+						if(i < count - 1) {
+							this.Print += $"{roll}, ";
+							this.Expression += $"{roll} + ";
+						} else {
+							var part = $"{roll} ";
+							this.Print += $"{roll} ){Format.Reset} ";
+							this.Expression += $"{roll} ) ";
+						}
+					}
+				} else {
+					var part = $"{piece} ";
+					this.Expression += part;
+					this.Print += part;
+				}
+			}
+		}
+
+	}
+
 }