[libpeas] Fix PEAS_DEBUG to work with glib's new G_MESSAGES_DEBUG

[Garrett Regier <gregier src gnome org>]

commit a41cd38979057997686d2989d0aaab6b68c8bca8
Author: Garrett Regier <garrettregier gmail com>
Date:   Fri Dec 9 15:07:57 2011 -0800

    Fix PEAS_DEBUG to work with glib's new G_MESSAGES_DEBUG

 libpeas/peas-debug.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)
---
diff --git a/libpeas/peas-debug.c b/libpeas/peas-debug.c
index ec7616e..bec217a 100644
--- a/libpeas/peas-debug.c
+++ b/libpeas/peas-debug.c
@@ -44,4 +44,25 @@ peas_debug_init (void)
                          debug_log_handler,
                          NULL);
     }
+  else
+    {
+      const gchar *g_messages_debug;
+
+      g_messages_debug = g_getenv ("G_MESSAGES_DEBUG");
+
+      if (g_messages_debug == NULL)
+        {
+          g_setenv ("G_MESSAGES_DEBUG", G_LOG_DOMAIN, TRUE);
+        }
+      else
+        {
+          gchar *new_g_messages_debug;
+
+          new_g_messages_debug = g_strconcat (g_messages_debug, " ",
+                                              G_LOG_DOMAIN, NULL);
+          g_setenv ("G_MESSAGES_DEBUG", new_g_messages_debug, TRUE);
+
+          g_free (new_g_messages_debug);
+        }
+    }
 }