Support use left hand

MinecraftClient/ChatBots/AutoFishing.cs

@@ -188,7 +188,10 @@ namespace MinecraftClient.ChatBots
 
         private void UseFishRod()
         {
+            if (Settings.AutoFishing_Mainhand)
                 UseItemInHand();
+            else
+                UseItemInLeftHand();
         }
 
         /// <summary>

MinecraftClient/McClient.cs

@@ -1277,6 +1277,15 @@ namespace MinecraftClient
             return InvokeOnMainThread(() => handler.SendUseItem(0, this.sequenceId));
         }
 
+        /// <summary>
+        /// Use the item currently in the player's left hand
+        /// </summary>
+        /// <returns>TRUE if the item was successfully used</returns>
+        public bool UseItemOnLeftHand()
+        {
+            return InvokeOnMainThread(() => handler.SendUseItem(1, this.sequenceId));
+        }
+
         /// <summary>
         /// Try to merge a slot
         /// </summary>

MinecraftClient/Resources/config/MinecraftClient.ini

@@ -207,6 +207,7 @@ interaction=Attack                 # Possible values: Interact, Attack (default)
 # /!\ Make sure server rules allow automated farming before using this bot
 enabled=false
 antidespawn=false
+main_hand=true                     # Use the main hand or the second hand to hold the rod
 fishing_delay=3.0                  # How long after entering the game to start fishing (seconds).
 fishing_timeout=600.0              # Fishing timeout (seconds). Timeout will re-cast the rod
 fishing_hook_threshold=0.2         # Fish hooks moving on the Y-axis above this threshold will be considered to have caught a fish.

MinecraftClient/Scripting/ChatBot.cs

@@ -1262,6 +1262,15 @@ namespace MinecraftClient
             return Handler.UseItemOnHand();
         }
 
+        /// <summary>
+        /// Use item currently in the player's hand (active inventory bar slot)
+        /// </summary>
+        /// <returns>TRUE if successful</returns>
+        protected bool UseItemInLeftHand()
+        {
+            return Handler.UseItemOnLeftHand();
+        }
+
         /// <summary>
         /// Check inventory handling enable status
         /// </summary>

MinecraftClient/Settings.cs

@@ -203,6 +203,7 @@ namespace MinecraftClient
         //Auto Fishing
         public static bool AutoFishing_Enabled = false;
         public static bool AutoFishing_Antidespawn = false;
+        public static bool AutoFishing_Mainhand = true;
         public static double AutoFishing_FishingDelay = 3.0;
         public static double AutoFishing_FishingTimeout = 600.0;
         public static double AutoFishing_FishingHookThreshold = 0.2;