[empathy] factor out empathy_launch_external_app()

[Xavier Claessens <xclaesse src gnome org>]

commit f4fc6c6be76bb4cdfb4ebda9ca7de6758f2f18d1
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Fri Aug 3 14:00:48 2012 +0200

    factor out empathy_launch_external_app()
    
    https://bugzilla.gnome.org/show_bug.cgi?id=680778

 libempathy-gtk/empathy-ui-utils.c |   48 +++++++++++++++++++++++++++++++++++++
 libempathy-gtk/empathy-ui-utils.h |    3 ++
 src/empathy-accounts-dialog.c     |   20 +--------------
 3 files changed, 53 insertions(+), 18 deletions(-)
---
diff --git a/libempathy-gtk/empathy-ui-utils.c b/libempathy-gtk/empathy-ui-utils.c
index 7c6c6a7..905037b 100644
--- a/libempathy-gtk/empathy-ui-utils.c
+++ b/libempathy-gtk/empathy-ui-utils.c
@@ -37,6 +37,7 @@
 #include <glib/gi18n-lib.h>
 #include <gtk/gtk.h>
 #include <gio/gio.h>
+#include <gio/gdesktopappinfo.h>
 
 #include <telepathy-glib/util.h>
 #include <folks/folks.h>
@@ -1641,3 +1642,50 @@ out:
   g_free (filename);
   g_object_unref (provider);
 }
+
+static gboolean
+launch_app_info (GAppInfo *app_info,
+    GError **error)
+{
+  GdkAppLaunchContext *context = NULL;
+  GdkDisplay *display;
+  GError *err = NULL;
+
+  display = gdk_display_get_default ();
+  context = gdk_display_get_app_launch_context (display);
+
+  if (!g_app_info_launch (app_info, NULL, (GAppLaunchContext *) context,
+        &err))
+    {
+      DEBUG ("Failed to launch %s: %s",
+          g_app_info_get_display_name (app_info), err->message);
+      g_propagate_error (error, err);
+      return FALSE;
+    }
+
+  tp_clear_object (&context);
+  return TRUE;
+}
+
+gboolean
+empathy_launch_external_app (const gchar *desktop_file,
+    GError **error)
+{
+  GDesktopAppInfo *desktop_info;
+  gboolean result;
+
+  desktop_info = g_desktop_app_info_new (desktop_file);
+  if (desktop_info == NULL)
+    {
+      DEBUG ("%s not found", desktop_file);
+
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
+          "%s not found", desktop_file);
+      return FALSE;
+    }
+
+  result = launch_app_info (G_APP_INFO (desktop_info), error);
+  g_object_unref (desktop_info);
+
+  return result;
+}
diff --git a/libempathy-gtk/empathy-ui-utils.h b/libempathy-gtk/empathy-ui-utils.h
index fdf69df..97777e5 100644
--- a/libempathy-gtk/empathy-ui-utils.h
+++ b/libempathy-gtk/empathy-ui-utils.h
@@ -147,6 +147,9 @@ void empathy_launch_program (const gchar *dir,
 
 void empathy_set_css_provider (GtkWidget *widget);
 
+gboolean empathy_launch_external_app (const gchar *desktop_file,
+    GError **error);
+
 G_END_DECLS
 
 #endif /*  __EMPATHY_UI_UTILS_H__ */
diff --git a/src/empathy-accounts-dialog.c b/src/empathy-accounts-dialog.c
index 74e2e3d..a4096b8 100644
--- a/src/empathy-accounts-dialog.c
+++ b/src/empathy-accounts-dialog.c
@@ -662,22 +662,6 @@ start_external_app (GAppInfo *app_info)
 }
 
 static void
-start_from_desktop_file (const char *desktop)
-{
-  GDesktopAppInfo *desktop_info;
-
-  desktop_info = g_desktop_app_info_new (desktop);
-  if (desktop_info == NULL)
-    {
-      g_critical ("Could not locate '%s'", desktop);
-      return;
-    }
-
-  start_external_app (G_APP_INFO (desktop_info));
-  g_object_unref (desktop_info);
-}
-
-static void
 use_external_storage_provider (EmpathyAccountsDialog *self,
     TpAccount *account)
 {
@@ -721,12 +705,12 @@ use_external_storage_provider (EmpathyAccountsDialog *self,
     }
   else if (!tp_strdiff (provider, EMPATHY_GOA_PROVIDER))
     {
-      start_from_desktop_file ("gnome-online-accounts-panel.desktop");
+      empathy_launch_external_app ("gnome-online-accounts-panel.desktop", NULL);
       return;
     }
   else if (!tp_strdiff (provider, EMPATHY_UOA_PROVIDER))
     {
-      start_from_desktop_file ("gnome-credentials-panel.desktop");
+      empathy_launch_external_app ("gnome-credentials-panel.desktop", NULL);
       return;
     }
   else