14 files changed, 119 insertions, 19 deletions

diff --git a/src/WixToolset.Extensibility/BaseCompilerExtension.cs b/src/WixToolset.Extensibility/BaseCompilerExtension.cs
index 5dfe5dcf..0f386e28 100644
--- a/src/WixToolset.Extensibility/BaseCompilerExtension.cs
+++ b/src/WixToolset.Extensibility/BaseCompilerExtension.cs
@@ -15,7 +15,7 @@ namespace WixToolset.Extensibility
         /// <summary>
         /// Messaging for use by the extension.
         /// </summary>
-        protected Messaging Messaging { get; private set; }
+        protected IMessaging Messaging { get; private set; }
 
         /// <summary>
         /// ParserHelper for use by the extension.
diff --git a/src/WixToolset.Extensibility/IBinderFileManagerCore.cs b/src/WixToolset.Extensibility/IBinderFileManagerCore.cs
index b73acb6b..27644413 100644
--- a/src/WixToolset.Extensibility/IBinderFileManagerCore.cs
+++ b/src/WixToolset.Extensibility/IBinderFileManagerCore.cs
@@ -6,7 +6,7 @@ namespace WixToolset.Extensibility
     using WixToolset.Data;
     using WixToolset.Data.Bind;
 
-    public interface IBinderFileManagerCore : IMessageHandler
+    public interface IBinderFileManagerCore
     {
         /// <summary>
         /// Gets or sets the path to cabinet cache.
diff --git a/src/WixToolset.Extensibility/ICompileContext.cs b/src/WixToolset.Extensibility/ICompileContext.cs
index bd0d0a4b..fbe38d63 100644
--- a/src/WixToolset.Extensibility/ICompileContext.cs
+++ b/src/WixToolset.Extensibility/ICompileContext.cs
@@ -6,12 +6,13 @@ namespace WixToolset.Extensibility
     using System.Collections.Generic;
     using System.Xml.Linq;
     using WixToolset.Data;
+    using WixToolset.Extensibility.Services;
 
     public interface ICompileContext
     {
         IServiceProvider ServiceProvider { get; }
 
-        Messaging Messaging { get; set; }
+        IMessaging Messaging { get; set; }
 
         string CompilationId { get; set; }
 
diff --git a/src/WixToolset.Extensibility/IDecompilerCore.cs b/src/WixToolset.Extensibility/IDecompilerCore.cs
index 1c367e0c..2133829a 100644
--- a/src/WixToolset.Extensibility/IDecompilerCore.cs
+++ b/src/WixToolset.Extensibility/IDecompilerCore.cs
@@ -6,7 +6,7 @@ namespace WixToolset.Extensibility
     using WixToolset.Data;
     using Wix = WixToolset.Data.Serialize;
 
-    public interface IDecompilerCore : IMessageHandler
+    public interface IDecompilerCore
     {
 
         /// <summary>
diff --git a/src/WixToolset.Extensibility/IInscribeContext.cs b/src/WixToolset.Extensibility/IInscribeContext.cs
index 6294271e..7f741024 100644
--- a/src/WixToolset.Extensibility/IInscribeContext.cs
+++ b/src/WixToolset.Extensibility/IInscribeContext.cs
@@ -3,18 +3,18 @@
 namespace WixToolset.Extensibility
 {
     using System;
-    using WixToolset.Data;
+    using WixToolset.Extensibility.Services;
 
     public interface IInscribeContext
     {
         IServiceProvider ServiceProvider { get; }
 
+        IMessaging Messaging { get; set; }
+
         string InputFilePath { get; set; }
 
         string IntermediateFolder { get; set; }
 
-        Messaging Messaging { get; }
-
         string OutputFile { get; set; }
 
         string SignedEngineFile { get; set; }
diff --git a/src/WixToolset.Extensibility/IInspectorCore.cs b/src/WixToolset.Extensibility/IInspectorCore.cs
index 06239ce5..9420ea05 100644
--- a/src/WixToolset.Extensibility/IInspectorCore.cs
+++ b/src/WixToolset.Extensibility/IInspectorCore.cs
@@ -2,12 +2,10 @@
 
 namespace WixToolset.Extensibility
 {
-    using WixToolset.Data;
-
     /// <summary>
     /// Core facilities for inspector extensions.
     /// </summary>
-    public interface IInspectorCore : IMessageHandler
+    public interface IInspectorCore
     {
         /// <summary>
         /// Gets whether an error occured.
diff --git a/src/WixToolset.Extensibility/ILibraryContext.cs b/src/WixToolset.Extensibility/ILibraryContext.cs
index b8c1887a..e715080f 100644
--- a/src/WixToolset.Extensibility/ILibraryContext.cs
+++ b/src/WixToolset.Extensibility/ILibraryContext.cs
@@ -5,12 +5,13 @@ namespace WixToolset.Extensibility
     using System;
     using System.Collections.Generic;
     using WixToolset.Data;
+    using WixToolset.Extensibility.Services;
 
     public interface ILibraryContext
     {
         IServiceProvider ServiceProvider { get; }
 
-        Messaging Messaging { get; set; }
+        IMessaging Messaging { get; set; }
 
         bool BindFiles { get; set; }
 
diff --git a/src/WixToolset.Extensibility/IMessageListener.cs b/src/WixToolset.Extensibility/IMessageListener.cs
new file mode 100644
index 00000000..91e3da31
--- /dev/null
+++ b/src/WixToolset.Extensibility/IMessageListener.cs
@@ -0,0 +1,17 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Extensibility
+{
+    using WixToolset.Data;
+
+    public interface IMessageListener
+    {
+        string ShortAppName { get; }
+
+        string LongAppName { get; }
+
+        void Write(Message message);
+
+        void Write(string message);
+    }
+}
diff --git a/src/WixToolset.Extensibility/IPreprocessContext.cs b/src/WixToolset.Extensibility/IPreprocessContext.cs
index 0f9c90bf..2e288d59 100644
--- a/src/WixToolset.Extensibility/IPreprocessContext.cs
+++ b/src/WixToolset.Extensibility/IPreprocessContext.cs
@@ -5,12 +5,13 @@ namespace WixToolset.Extensibility
     using System;
     using System.Collections.Generic;
     using WixToolset.Data;
+    using WixToolset.Extensibility.Services;
 
     public interface IPreprocessContext
     {
         IServiceProvider ServiceProvider { get; }
 
-        Messaging Messaging { get; set; }
+        IMessaging Messaging { get; set; }
 
         IEnumerable<IPreprocessorExtension> Extensions { get; set; }
 
diff --git a/src/WixToolset.Extensibility/IUnbindContext.cs b/src/WixToolset.Extensibility/IUnbindContext.cs
index 82364652..beaa5491 100644
--- a/src/WixToolset.Extensibility/IUnbindContext.cs
+++ b/src/WixToolset.Extensibility/IUnbindContext.cs
@@ -2,10 +2,15 @@
 
 namespace WixToolset.Extensibility
 {
-    using WixToolset.Data;
+    using System;
+    using WixToolset.Extensibility.Services;
 
     public interface IUnbindContext
     {
+        IServiceProvider ServiceProvider { get; }
+
+        IMessaging Messaging { get; set; }
+
         string ExportBasePath { get; set; }
 
         string InputFilePath { get; set; }
@@ -14,8 +19,6 @@ namespace WixToolset.Extensibility
 
         bool IsAdminImage { get; set; }
 
-        Messaging Messaging { get; }
-
         bool SuppressDemodularization { get; set; }
 
         bool SuppressExtractCabinets { get; set; }
diff --git a/src/WixToolset.Extensibility/Services/IBindContext.cs b/src/WixToolset.Extensibility/Services/IBindContext.cs
index 6bed0ef6..ad1aa818 100644
--- a/src/WixToolset.Extensibility/Services/IBindContext.cs
+++ b/src/WixToolset.Extensibility/Services/IBindContext.cs
@@ -10,7 +10,7 @@ namespace WixToolset.Extensibility.Services
     {
         IServiceProvider ServiceProvider { get; }
 
-        Messaging Messaging { get; set; }
+        IMessaging Messaging { get; set; }
 
         IEnumerable<BindPath> BindPaths { get; set; }
 
diff --git a/src/WixToolset.Extensibility/Services/ICommandLineContext.cs b/src/WixToolset.Extensibility/Services/ICommandLineContext.cs
index 0e040d7f..27d4e6dd 100644
--- a/src/WixToolset.Extensibility/Services/ICommandLineContext.cs
+++ b/src/WixToolset.Extensibility/Services/ICommandLineContext.cs
@@ -3,13 +3,12 @@
 namespace WixToolset.Extensibility.Services
 {
     using System;
-    using WixToolset.Data;
 
     public interface ICommandLineContext
     {
         IServiceProvider ServiceProvider { get; }
 
-        Messaging Messaging { get; set; }
+        IMessaging Messaging { get; set; }
 
         IExtensionManager ExtensionManager { get; set; }
 
diff --git a/src/WixToolset.Extensibility/Services/ILinkContext.cs b/src/WixToolset.Extensibility/Services/ILinkContext.cs
index 25c7962f..e098a900 100644
--- a/src/WixToolset.Extensibility/Services/ILinkContext.cs
+++ b/src/WixToolset.Extensibility/Services/ILinkContext.cs
@@ -10,7 +10,7 @@ namespace WixToolset.Extensibility.Services
     {
         IServiceProvider ServiceProvider { get; }
 
-        Messaging Messaging { get; set; }
+        IMessaging Messaging { get; set; }
 
         IEnumerable<ILinkerExtension> Extensions { get; set; }
 
diff --git a/src/WixToolset.Extensibility/Services/IMessaging.cs b/src/WixToolset.Extensibility/Services/IMessaging.cs
new file mode 100644
index 00000000..901c7af4
--- /dev/null
+++ b/src/WixToolset.Extensibility/Services/IMessaging.cs
@@ -0,0 +1,80 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Extensibility.Services
+{
+    using WixToolset.Data;
+
+    /// <summary>
+    /// Interface for handling messages (error/warning/verbose).
+    /// </summary>
+    public interface IMessaging
+    {
+        /// <summary>
+        /// Indicates whether an error has been found.
+        /// </summary>
+        /// <value>A bool indicating whether an error has been found.</value>
+        bool EncounteredError { get; }
+
+        /// <summary>
+        /// Gets the last error code encountered during messaging.
+        /// </summary>
+        /// <value>The exit code for the process.</value>
+        int LastErrorNumber { get; }
+
+        /// <summary>
+        /// Gets or sets the option to show verbose messages.
+        /// </summary>
+        /// <value>The option to show verbose messages.</value>
+        bool ShowVerboseMessages { get; set; }
+
+        /// <summary>
+        /// Gets or sets the option to suppress all warning messages.
+        /// </summary>
+        /// <value>The option to suppress all warning messages.</value>
+        bool SuppressAllWarnings { get; set; }
+
+        /// <summary>
+        /// Gets and sets the option to treat warnings as errors.
+        /// </summary>
+        /// <value>The option to treat warnings as errors.</value>
+        bool WarningsAsError { get; set; }
+
+        /// <summary>
+        /// Sets the listener for messaging.
+        /// </summary>
+        /// <param name="listener"></param>
+        void SetListener(IMessageListener listener);
+
+        /// <summary>
+        /// Adds a warning message id to be elevated to an error message.
+        /// </summary>
+        /// <param name="warningNumber">Id of the message to elevate.</param>
+        void ElevateWarningMessage(int warningNumber);
+
+        /// <summary>
+        /// Adds a warning message id to be suppressed in message output.
+        /// </summary>
+        /// <param name="warningNumber">Id of the message to suppress.</param>
+        void SuppressWarningMessage(int warningNumber);
+
+        /// <summary>
+        /// Formats a message to standard message.
+        /// </summary>
+        /// <param name="message">Message to format.</param>
+        /// <returns>Formatted message</returns>
+        string FormatMessage(Message message);
+
+        /// <summary>
+        /// Sends a message with the given arguments.
+        /// </summary>
+        /// <param name="message">Message to write.</param>
+        void Write(Message message);
+
+        /// <summary>
+        /// Sends a message with the given arguments.
+        /// </summary>
+        /// <param name="message">Message to write.</param>
+        /// <param name="verbose">Indicates where to write a verbose message.</param>
+        void Write(string message, bool verbose = false);
+    }
+}