[smuxi/stable] Frontend(-GNOME): fixed frontend commands with smuxi-server < 0.10

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit d9ddbec5b6b69de7acad786744b8e5e402f9fbc9
Author: Mirco Bauer <meebey meebey net>
Date:   Sat Jan 11 23:51:02 2014 +0100

    Frontend(-GNOME): fixed frontend commands with smuxi-server < 0.10
    
    Session.AddMessageToFrontend() was introduced with Smuxi 0.10 and thus we can't
    simply assume it is available. So we check engine version now and fallback to
    the unoptimized Session.AddMessageToChat() if needed.

 src/Frontend-GNOME/Entry.cs    |    1 +
 src/Frontend-GNOME/Frontend.cs |    2 +-
 src/Frontend/CommandManager.cs |   28 +++++++++++++++++++++++-----
 3 files changed, 25 insertions(+), 6 deletions(-)
---
diff --git a/src/Frontend-GNOME/Entry.cs b/src/Frontend-GNOME/Entry.cs
index 6258c69..1fdc580 100644
--- a/src/Frontend-GNOME/Entry.cs
+++ b/src/Frontend-GNOME/Entry.cs
@@ -849,6 +849,7 @@ namespace Smuxi.Frontend.Gnome
                 _CommandManager = null;
             } else {
                 _CommandManager = new CommandManager(Frontend.Session);
+                _CommandManager.EngineVersion = Frontend.EngineVersion;
                 _CommandManager.ExceptionEvent +=
                 delegate(object sender, CommandExceptionEventArgs e) {
                     Gtk.Application.Invoke(delegate {
diff --git a/src/Frontend-GNOME/Frontend.cs b/src/Frontend-GNOME/Frontend.cs
index eb9b7ee..cb79c5c 100644
--- a/src/Frontend-GNOME/Frontend.cs
+++ b/src/Frontend-GNOME/Frontend.cs
@@ -456,9 +456,9 @@ namespace Smuxi.Frontend.Gnome
                             Thread.Sleep(30 * 1000);
                         }
                     }
-                    Session = _MainWindow.EngineManager.Session;
                     _UserConfig = _MainWindow.EngineManager.UserConfig;
                     EngineVersion = _MainWindow.EngineManager.EngineVersion;
+                    Session = _MainWindow.EngineManager.Session;
 
                     Gtk.Application.Invoke(delegate {
                         Frontend.ConnectEngineToGUI();
diff --git a/src/Frontend/CommandManager.cs b/src/Frontend/CommandManager.cs
index 6e3773b..b8c445c 100644
--- a/src/Frontend/CommandManager.cs
+++ b/src/Frontend/CommandManager.cs
@@ -52,6 +52,8 @@ namespace Smuxi.Frontend
         TaskQueue       f_TaskQueue;
         TimeSpan        f_LastCommandTimeSpan;
 
+        public Version EngineVersion { get; set; }
+
         public TimeSpan LastCommandTimeSpan {
             get {
                 return f_LastCommandTimeSpan;
@@ -236,7 +238,7 @@ namespace Smuxi.Frontend
                                                cmd.CommandCharacter, output));
                 } else {
                     var msg = new MessageBuilder().AppendText(output).ToMessage();
-                    f_Session.AddMessageToFrontend(cmd, msg);
+                    AddMessageToFrontend(cmd, msg);
                 }
             };
 
@@ -283,7 +285,7 @@ namespace Smuxi.Frontend
                         AppendErrorText("Executing '{0}' failed with: {1}",
                                         command, ex.Message).
                         ToMessage();
-                    f_Session.AddMessageToFrontend(cmd, msg);
+                    AddMessageToFrontend(cmd, msg);
                 }
             }
         }
@@ -296,7 +298,7 @@ namespace Smuxi.Frontend
                 AppendEventPrefix().
                     AppendText(cmd.Parameter).
                     ToMessage();
-            f_Session.AddMessageToFrontend(cmd, msg);
+            AddMessageToFrontend(cmd, msg);
         }
 
         public void CommandGenerateMessages(CommandModel cmd, IChatView chat)
@@ -343,7 +345,7 @@ namespace Smuxi.Frontend
                 AppendEventPrefix().
                 AppendText(_("Unknown Command: {0}"), cmd.Command).
                 ToMessage();
-            f_Session.AddMessageToFrontend(cmd, msg);
+            AddMessageToFrontend(cmd, msg);
         }
 
         void NotEnoughParameters(CommandModel cmd)
@@ -352,7 +354,7 @@ namespace Smuxi.Frontend
                 AppendEventPrefix().
                 AppendText(_("Not enough parameters for {0} command"), cmd.Command).
                 ToMessage();
-            f_Session.AddMessageToFrontend(cmd, msg);
+            AddMessageToFrontend(cmd, msg);
         }
 
         MessageBuilder CreateMessageBuilder()
@@ -360,6 +362,22 @@ namespace Smuxi.Frontend
             return new MessageBuilder();
         }
 
+        void AddMessageToFrontend(CommandModel cmd, MessageModel msg)
+        {
+            if (cmd == null) {
+                throw new ArgumentNullException("cmd");
+            }
+            if (msg == null) {
+                throw new ArgumentNullException("msg");
+            }
+
+            if (EngineVersion != null && EngineVersion >= new Version(0, 10)) {
+                f_Session.AddMessageToFrontend(cmd, msg);
+            } else {
+                f_Session.AddMessageToChat(cmd.Chat, msg);
+            }
+        }
+
         protected virtual void OnTaskQueueExceptionEvent(object sender, TaskQueueExceptionEventArgs e)
         {
             Trace.Call(sender, e);