feat: add better IPC

Dalamud/Interface/DalamudDataWindow.cs

@@ -190,14 +190,29 @@ namespace Dalamud.Interface
                             Log.Debug(msg.Expand);
                         });
 
+                        if (ImGui.Button("Add test sub any")) i1.SubscribeAny((o, a) => {
+                            dynamic msg = a;
+                            Log.Debug($"From {o}: {msg.Expand}");
+                        });
+
                         if (ImGui.Button("Remove test sub")) i1.Unsubscribe("DalamudTestPub");
 
+                        if (ImGui.Button("Remove test sub any")) i1.UnsubscribeAny();
+
                         if (ImGui.Button("Send test message")) {
                             dynamic testMsg = new ExpandoObject();
                             testMsg.Expand = "dong";
                             i2.SendMessage(testMsg);
                         }
 
+                        // This doesn't actually work, so don't mind it - impl relies on plugins being registered in PluginManager
+                        if (ImGui.Button("Send test message any"))
+                        {
+                            dynamic testMsg = new ExpandoObject();
+                            testMsg.Expand = "dong";
+                            i2.SendMessage("DalamudTestSub", testMsg);
+                        }
+
                         foreach (var sub in this.dalamud.PluginManager.IpcSubscriptions) {
                             ImGui.Text($"Source:{sub.SourcePluginName} Sub:{sub.SubPluginName}");
                         }

Dalamud/Plugin/DalamudPluginInterface.cs

@@ -131,6 +131,20 @@ namespace Dalamud.Plugin
 
         #region IPC
 
+        internal Action<string, ExpandoObject> anyPluginIpcAction;
+
+        /// <summary>
+        /// Subscribe to an IPC message by any plugin.
+        /// </summary>
+        /// <param name="action">The action to take when a message was received.</param>
+        public void SubscribeAny(Action<string, ExpandoObject> action)
+        {
+            if (this.anyPluginIpcAction != null)
+                throw new InvalidOperationException("Can't subscribe multiple times.");
+
+            this.anyPluginIpcAction = action;
+        }
+
         /// <summary>
         /// Subscribe to an IPC message by a plugin.
         /// </summary>
@@ -143,6 +157,17 @@ namespace Dalamud.Plugin
             this.dalamud.PluginManager.IpcSubscriptions.Add((this.pluginName, pluginName, action));
         }
 
+        /// <summary>
+        /// Unsubscribe from messages from any plugin.
+        /// </summary>
+        public void UnsubscribeAny()
+        {
+            if (this.anyPluginIpcAction == null)
+                throw new InvalidOperationException("Wasn't subscribed to this plugin.");
+
+            this.anyPluginIpcAction = null;
+        }
+
         /// <summary>
         /// Unsubscribe from messages from a plugin.
         /// </summary>
@@ -166,6 +191,23 @@ namespace Dalamud.Plugin
             }
         }
 
+        /// <summary>
+        /// Send a message to a specific plugin.
+        /// </summary>
+        /// <param name="pluginName">The InternalName of the plugin to send the message to.</param>
+        /// <param name="message">The message to send.</param>
+        /// <returns>True if the corresponding plugin was present and received the message.</returns>
+        public bool SendMessage(string pluginName, ExpandoObject message)
+        {
+            var (_, _, pluginInterface) = this.dalamud.PluginManager.Plugins.FirstOrDefault(x => x.Definition.InternalName == this.pluginName);
+
+            if (pluginInterface?.anyPluginIpcAction == null)
+                return false;
+
+            pluginInterface.anyPluginIpcAction.Invoke(this.pluginName, message);
+            return true;
+        }
+
         #endregion
 
         #region Logging