[gdm] libgdm: refactor session list handling code

[Ray Strode <halfline src gnome org>]

commit 754754c9b6f8da6066a37c47141c97da71d95e39
Author: Ray Strode <rstrode redhat com>
Date:   Mon Jun 15 15:03:51 2015 -0400

    libgdm: refactor session list handling code
    
    This commit splits the code for getting sessions up into two chunks:
    xorg and wayland.
    
    This is necessary because future commits will treat xorg and wayland
    sessions differently.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=757715

 libgdm/gdm-sessions.c |   18 ++++++++++++++----
 1 files changed, 14 insertions(+), 4 deletions(-)
---
diff --git a/libgdm/gdm-sessions.c b/libgdm/gdm-sessions.c
index 08220fe..db62516 100644
--- a/libgdm/gdm-sessions.c
+++ b/libgdm/gdm-sessions.c
@@ -188,25 +188,35 @@ static void
 collect_sessions (void)
 {
         int         i;
-        const char *search_dirs[] = {
+        const char *xorg_search_dirs[] = {
                 "/etc/X11/sessions/",
                 DMCONFDIR "/Sessions/",
                 DATADIR "/gdm/BuiltInSessions/",
                 DATADIR "/xsessions/",
+                NULL
+        };
+
 #ifdef ENABLE_WAYLAND_SUPPORT
+        const char *wayland_search_dirs[] = {
                 DATADIR "/wayland-sessions/",
-#endif
                 NULL
         };
+#endif
 
         if (gdm_available_sessions_map == NULL) {
                 gdm_available_sessions_map = g_hash_table_new_full (g_str_hash, g_str_equal,
                                                                     g_free, g_free);
         }
 
-        for (i = 0; search_dirs [i] != NULL; i++) {
-                collect_sessions_from_directory (search_dirs [i]);
+        for (i = 0; xorg_search_dirs [i] != NULL; i++) {
+                collect_sessions_from_directory (xorg_search_dirs [i]);
         }
+
+#ifdef ENABLE_WAYLAND_SUPPORT
+        for (i = 0; wayland_search_dirs [i] != NULL; i++) {
+                collect_sessions_from_directory (wayland_search_dirs [i]);
+        }
+#endif
 }
 
 /**