Added functions and constants

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

@@ -1,26 +1,80 @@
 using Discord;
 using Discord.Commands;
+using NadekoBot.Attributes;
 using NadekoBot.Extensions;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
+using System.Text;
 using System.Threading.Tasks;
 
-namespace NadekoBot.Modules.Searches.Commands
+namespace NadekoBot.Modules.Searches
 {
+    [Group]
     public partial class Searches
     {
-        public static async Task Calc(IMessage msg, [Remainder] string expression)
+        [LocalizedCommand, LocalizedDescription, LocalizedSummary]
+        [RequireContext(ContextType.Guild)]
+        public static async Task Calculate(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();
 
+            try
+            {
+
+
+                var expr = new NCalc.Expression(expression, NCalc.EvaluateOptions.IgnoreCase);
+                expr.EvaluateParameter += Expr_EvaluateParameter;
+                expr.EvaluateFunction += Expr_EvaluateFunction;
+                var result = expr.Evaluate();
                 await msg.Reply(string.Format("Your expression evaluated to: {0}", expr.Error ?? result));
             }
+            catch (Exception e)
+            {
+                await msg.Reply($"Your expression failed to evaluate: {e.Message} ");
+            }
+
+
+        }
+
+        private static void Expr_EvaluateFunction(string name, NCalc.FunctionArgs args)
+        {
+            switch (name.ToLowerInvariant())
+            {
+
+            }
+        }
+
+        private static void Expr_EvaluateParameter(string name, NCalc.ParameterArgs args)
+        {
+            switch (name.ToLowerInvariant()) {
+                case "pi": args.Result= Math.PI;
+                    break;
+                case "e": args.Result = Math.E;
+                    break;
+                 
+            }
+
+        }
+
+        [Command("calcOperations")]
+        [RequireContext(ContextType.Guild)]
+        public async Task calcOperations(IMessage msg)
+        {
+            StringBuilder builder = new StringBuilder();
+            var selection = typeof(Math).GetTypeInfo().GetMethods().Except(typeof(object).GetTypeInfo().GetMethods()).Select(x =>
+            {
+                var name = x.Name;
+                if (x.GetParameters().Any())
+                {
+                    name += " (" + string.Join(", ", x.GetParameters().Select(y => y.IsOptional ? $"[{y.ParameterType.Name + " " + y.Name }]" : y.ParameterType.Name + " " + y.Name)) + ")";
+                }
+
+                return name;
+            });
+            foreach (var method in selection) builder.AppendLine(method);
+            await msg.ReplyLong(builder.ToString());
+        }
     }
     class ExpressionContext
     {