Added the !sentiment command as suggested by Hugo in #312

Author: csharpfritz

Fritz.Chatbot/Commands/SentimentCommand.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using Fritz.StreamLib.Core;
+
+namespace Fritz.Chatbot.Commands
+{
+	public class SentimentCommand : IBasicCommand
+	{
+		public string Trigger => "sentiment";
+		public string Description => "Information about the sentiment analysis features of the chat room";
+		public TimeSpan? Cooldown => TimeSpan.FromSeconds(30);
+
+		public async Task Execute(IChatService chatService, string userName, ReadOnlyMemory<char> rhs)
+		{
+
+			var sb = new StringBuilder();
+			sb.Append($"The sentiment over the last minute is {SentimentSink.Sentiment1Minute.ToString("00.0%")} percent positive ");
+			sb.Append((SentimentSink.Sentiment1Minute < SentimentSink.Sentiment5Minute) ? "and trending upward (up arrow) " : "and trending downward (down arrow) ");
+			sb.Append("compared to the last five minutes ");
+			sb.Append($"The most recent messages were {((SentimentSink.SentimentInstant >=0.5) ? "positive" : "negative")} (smiley face)");
+
+			await chatService.SendMessageAsync(sb.ToString());
+
+		}
+	}
+}

Fritz.Chatbot/Commands/SentimentSink.cs

@@ -10,6 +10,12 @@ public class SentimentSink
 
 		public static Queue<string> RecentChatMessages { get; } = new Queue<string>();
 
+		public static double SentimentInstant { get; set; }
+
+		public static double Sentiment1Minute { get; set; }
+
+		public static double Sentiment5Minute { get; set; }
+
 	}
 
 }

Fritz.StreamTools/Services/SentimentService.cs

@@ -85,9 +85,14 @@ public async Task Run()
 
 					var now = DateTime.Now;
 					_Observations.Add(now, (results.Documents.Count, avgScore));
-					_followerClient.UpdateSentiment(avgScore,
-						CalculateSentimentOverLastMinutes(1),
-						CalculateSentimentOverLastMinutes(5),
+
+					SentimentSink.SentimentInstant = avgScore;
+					SentimentSink.Sentiment1Minute = CalculateSentimentOverLastMinutes(1);
+					SentimentSink.Sentiment5Minute = CalculateSentimentOverLastMinutes(5);
+
+					_followerClient.UpdateSentiment(SentimentSink.SentimentInstant,
+						SentimentSink.Sentiment1Minute,
+						SentimentSink.Sentiment5Minute,
 						CalculateSentimentOverLastMinutes());
 
 				}