1 files changed, 15 insertions, 1 deletions
diff --git a/src/StardewModdingAPI/Framework/InternalExtensions.cs b/src/StardewModdingAPI/Framework/InternalExtensions.cs
index 2842bc83..3709e05d 100644
--- a/src/StardewModdingAPI/Framework/InternalExtensions.cs
+++ b/src/StardewModdingAPI/Framework/InternalExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -71,6 +71,20 @@ namespace StardewModdingAPI.Framework
             }
         }
 
+        /// <summary>Log a message for the player or developer the first time it occurs.</summary>
+        /// <param name="monitor">The monitor through which to log the message.</param>
+        /// <param name="hash">The hash of logged messages.</param>
+        /// <param name="message">The message to log.</param>
+        /// <param name="level">The log severity level.</param>
+        public static void LogOnce(this IMonitor monitor, HashSet<string> hash, string message, LogLevel level = LogLevel.Trace)
+        {
+            if (!hash.Contains(message))
+            {
+                monitor.Log(message, level);
+                hash.Add(message);
+            }
+        }
+
         /****
         ** Exceptions
         ****/