[libpeas] Show debugging log messages only when PEAS_DEBUG is set

[Steve Frécinaux <sfre src gnome org>]

commit 48c847c31fa5931668f30502ac8434cb14bd3aad
Author: Garrett Regier <alias301 gmail com>
Date:   Mon Jun 28 10:01:50 2010 -0700

    Show debugging log messages only when PEAS_DEBUG is set
    
    https://bugzilla.gnome.org/show_bug.cgi?id=622997

 libpeas/Makefile.am   |    2 ++
 libpeas/peas-debug.c  |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 libpeas/peas-debug.h  |   34 ++++++++++++++++++++++++++++++++++
 libpeas/peas-engine.c |    5 +++++
 4 files changed, 88 insertions(+), 0 deletions(-)
---
diff --git a/libpeas/Makefile.am b/libpeas/Makefile.am
index 18731fd..43fde6c 100644
--- a/libpeas/Makefile.am
+++ b/libpeas/Makefile.am
@@ -26,6 +26,7 @@ INST_H_FILES =			\
 	peas-engine.h
 
 NOINST_H_FILES =		\
+	peas-debug.h		\
 	peas-dirs.h		\
 	peas-i18n.h		\
 	peas-introspection.h	\
@@ -33,6 +34,7 @@ NOINST_H_FILES =		\
 	peas-plugin-loader.h
 
 C_FILES =			\
+	peas-debug.c		\
 	peas-dirs.c		\
 	peas-i18n.c		\
 	peas-object-module.c	\
diff --git a/libpeas/peas-debug.c b/libpeas/peas-debug.c
new file mode 100644
index 0000000..c94d672
--- /dev/null
+++ b/libpeas/peas-debug.c
@@ -0,0 +1,47 @@
+/*
+ * peas-debug.c
+ * This file is part of libpeas
+ *
+ * Copyright (C) 2010 - Garrett Regier
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Library General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "libpeas/peas-debug.h"
+
+
+static void
+debug_log_handler (const gchar    *log_domain,
+                   GLogLevelFlags  log_level,
+                   const gchar    *message,
+                   gpointer        user_data)
+{
+}
+
+void
+peas_debug_init (void)
+{
+  if (g_getenv ("PEAS_DEBUG") == NULL)
+    {
+      g_log_set_handler (G_LOG_DOMAIN,
+                         G_LOG_LEVEL_DEBUG,
+                         debug_log_handler,
+                         NULL);
+    }
+}
diff --git a/libpeas/peas-debug.h b/libpeas/peas-debug.h
new file mode 100644
index 0000000..79c006e
--- /dev/null
+++ b/libpeas/peas-debug.h
@@ -0,0 +1,34 @@
+/*
+ * peas-debug.h
+ * This file is part of libpeas
+ *
+ * Copyright (C) 2010 - Garrett Regier
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Library General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+
+#ifndef __PEAS_DEBUG_H__
+#define __PEAS_DEBUG_H__
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+void  peas_debug_init (void);
+
+G_END_DECLS
+
+#endif /* __PEAS_DEBUG_H__ */
diff --git a/libpeas/peas-engine.c b/libpeas/peas-engine.c
index f2737d0..6b4c8a6 100644
--- a/libpeas/peas-engine.c
+++ b/libpeas/peas-engine.c
@@ -33,6 +33,7 @@
 #include "peas-object-module.h"
 #include "peas-extension.h"
 #include "peas-dirs.h"
+#include "peas-debug.h"
 
 /**
  * SECTION:peas-engine
@@ -503,6 +504,10 @@ peas_engine_class_init (PeasEngineClass *klass)
                   G_SIGNAL_TYPE_STATIC_SCOPE);
 
   g_type_class_add_private (klass, sizeof (PeasEnginePrivate));
+
+  /* We are doing some global initialization here as there is currently no
+   * global init function for libpeas. */
+  peas_debug_init ();
 }
 
 static LoaderInfo *