Implement command completion suggestions.

MinecraftClient/CommandHandler/CmdResult.cs

@@ -0,0 +1,96 @@
+using System;
+
+namespace MinecraftClient.CommandHandler
+{
+    public class CmdResult
+    {
+        public static readonly CmdResult Empty = new();
+
+        internal static McClient? client;
+
+        public enum Status
+        {
+            NotRun = int.MinValue,
+            FailChunkNotLoad = -4,
+            FailNeedEntity = -3,
+            FailNeedInventory = -2,
+            FailNeedTerrain = -1,
+            Fail = 0,
+            Done = 1,
+        }
+
+        public CmdResult()
+        {
+            this.status = Status.NotRun;
+            this.result = null;
+        }
+
+        public Status status;
+
+        public string? result;
+
+        public int SetAndReturn(Status status)
+        {
+            this.status = status;
+            this.result = status switch
+            {
+#pragma warning disable format // @formatter:off
+                Status.NotRun             =>  null,
+                Status.FailChunkNotLoad   =>  null,
+                Status.FailNeedEntity     =>  Translations.extra_entity_required,
+                Status.FailNeedInventory  =>  Translations.extra_inventory_required,
+                Status.FailNeedTerrain    =>  Translations.extra_terrainandmovement_required,
+                Status.Fail               =>  Translations.general_fail,
+                Status.Done               =>  null,
+                _                         =>  null,
+#pragma warning restore format // @formatter:on
+            };
+            return Convert.ToInt32(this.status);
+        }
+
+        public int SetAndReturn(Status status, string? result)
+        {
+            this.status = status;
+            this.result = result;
+            return Convert.ToInt32(this.status);
+        }
+
+        public int SetAndReturn(int code, string? result)
+        {
+            this.status = (Status)Enum.ToObject(typeof(Status), code);
+            if (!Enum.IsDefined(typeof(Status), status))
+                throw new InvalidOperationException($"{code} is not a legal return value.");
+            this.result = result;
+            return code;
+        }
+
+        public int SetAndReturn(bool result)
+        {
+            this.status = result ? Status.Done : Status.Fail;
+            this.result = result ? Translations.general_done : Translations.general_fail;
+            return Convert.ToInt32(this.status);
+        }
+
+        public int SetAndReturn(string? result)
+        {
+            this.status = Status.Done;
+            this.result = result;
+            return Convert.ToInt32(this.status);
+        }
+
+        public int SetAndReturn(string? resultstr, bool result)
+        {
+            this.status = result ? Status.Done : Status.Fail;
+            this.result = resultstr;
+            return Convert.ToInt32(this.status);
+        }
+
+        public override string ToString()
+        {
+            if (result != null)
+                return result;
+            else
+                return status.ToString();
+        }
+    }
+}