calculate

src/NadekoBot/Modules/Searches/Commands/CalcCommand.cs

@@ -0,0 +1,30 @@
+using Discord;
+using Discord.Commands;
+using NadekoBot.Extensions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace NadekoBot.Modules.Searches.Commands
+{
+    public partial class Searches
+    {
+        public static async Task Calc(IMessage msg, [Remainder] string expression)
+        {
+            var expr = new NCalc.Expression(expression);
+            //expr.EvaluateParameter += delegate (string name, NCalc.ParameterArgs args)
+            //{
+            //    if (name.ToLowerInvariant() == "pi") args.Result = Math.PI;
+            //};
+            var result = expr.Evaluate();
+
+            await msg.Reply(string.Format("Your expression evaluated to: {0}", expr.Error ?? result));
+        }
+    }
+    class ExpressionContext
+    {
+        public double Pi { get; set; } = Math.PI;
+    }
+
+}

src/NadekoBot/Modules/Searches/Searches.cs

@@ -13,6 +13,7 @@ using NadekoBot.Extensions;
 using System.Text.RegularExpressions;
 using System.Net;
 using NadekoBot.Modules.Searches.Commands.Models;
+using NCalc;
 
 namespace NadekoBot.Modules.Searches
 {
@@ -26,6 +27,14 @@ namespace NadekoBot.Modules.Searches
             _yt = youtube;
         }
 
+        [LocalizedCommand, LocalizedDescription, LocalizedSummary]
+        [RequireContext(ContextType.Guild)]
+        public async Task Calc(IMessage msg, [Remainder] string calculation)
+        {
+            var channel = msg.Channel as ITextChannel;
+
+        }
+
         [LocalizedCommand, LocalizedDescription, LocalizedSummary]
         [RequireContext(ContextType.Guild)]
         public async Task Weather(IMessage imsg, string city, string country)