1 files changed, 113 insertions, 0 deletions
diff --git a/src/StardewModdingAPI/Framework/ModRegistry.cs b/src/StardewModdingAPI/Framework/ModRegistry.cs
new file mode 100644
index 00000000..9dde7a20
--- /dev/null
+++ b/src/StardewModdingAPI/Framework/ModRegistry.cs
@@ -0,0 +1,113 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Reflection;
+
+namespace StardewModdingAPI.Framework
+{
+    /// <summary>Tracks the installed mods.</summary>
+    internal class ModRegistry
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The registered mod data.</summary>
+        private readonly List<IModMetadata> Mods = new List<IModMetadata>();
+
+        /// <summary>The friendly mod names treated as deprecation warning sources (assembly full name => mod name).</summary>
+        private readonly IDictionary<string, string> ModNamesByAssembly = new Dictionary<string, string>();
+
+
+        /*********
+        ** Public methods
+        *********/
+        /****
+        ** Basic metadata
+        ****/
+        /// <summary>Get metadata for all loaded mods.</summary>
+        public IEnumerable<IManifest> GetAll()
+        {
+            return this.Mods.Select(p => p.Manifest);
+        }
+
+        /// <summary>Get metadata for a loaded mod.</summary>
+        /// <param name="uniqueID">The mod's unique ID.</param>
+        /// <returns>Returns the matching mod's metadata, or <c>null</c> if not found.</returns>
+        public IManifest Get(string uniqueID)
+        {
+            // normalise search ID
+            if (string.IsNullOrWhiteSpace(uniqueID))
+                return null;
+            uniqueID = uniqueID.Trim();
+
+            // find match
+            return this.GetAll().FirstOrDefault(p => p.UniqueID.Trim().Equals(uniqueID, StringComparison.InvariantCultureIgnoreCase));
+        }
+
+        /// <summary>Get whether a mod has been loaded.</summary>
+        /// <param name="uniqueID">The mod's unique ID.</param>
+        public bool IsLoaded(string uniqueID)
+        {
+            return this.Get(uniqueID) != null;
+        }
+
+        /****
+        ** Mod data
+        ****/
+        /// <summary>Register a mod as a possible source of deprecation warnings.</summary>
+        /// <param name="metadata">The mod metadata.</param>
+        public void Add(IModMetadata metadata)
+        {
+            this.Mods.Add(metadata);
+            this.ModNamesByAssembly[metadata.Mod.GetType().Assembly.FullName] = metadata.DisplayName;
+        }
+
+        /// <summary>Get all enabled mods.</summary>
+        public IEnumerable<IModMetadata> GetMods()
+        {
+            return (from mod in this.Mods select mod);
+        }
+
+        /// <summary>Get the friendly mod name which defines a type.</summary>
+        /// <param name="type">The type to check.</param>
+        /// <returns>Returns the mod name, or <c>null</c> if the type isn't part of a known mod.</returns>
+        public string GetModFrom(Type type)
+        {
+            // null
+            if (type == null)
+                return null;
+
+            // known type
+            string assemblyName = type.Assembly.FullName;
+            if (this.ModNamesByAssembly.ContainsKey(assemblyName))
+                return this.ModNamesByAssembly[assemblyName];
+
+            // not found
+            return null;
+        }
+
+        /// <summary>Get the friendly name for the closest assembly registered as a source of deprecation warnings.</summary>
+        /// <returns>Returns the source name, or <c>null</c> if no registered assemblies were found.</returns>
+        public string GetModFromStack()
+        {
+            // get stack frames
+            StackTrace stack = new StackTrace();
+            StackFrame[] frames = stack.GetFrames();
+            if (frames == null)
+                return null;
+
+            // search stack for a source assembly
+            foreach (StackFrame frame in frames)
+            {
+                MethodBase method = frame.GetMethod();
+                string name = this.GetModFrom(method.ReflectedType);
+                if (name != null)
+                    return name;
+            }
+
+            // no known assembly found
+            return null;
+        }
+    }
+}