add support for _NET_NUMBER_OF_DESKTOPS

awesome.c

@@ -331,6 +331,8 @@ main(int argc, char *argv[])
     XSync(dpy, False);
     globalconf.display = dpy;
 
+    ewmh_init_atoms();
+
     globalconf.screens = p_new(VirtScreen, get_screen_count());
     focus_add_client(NULL);
     /* store display */
@@ -344,8 +346,6 @@ main(int argc, char *argv[])
         statusbar_draw(screen);
     }
 
-    ewmh_init_atoms();
-
     /* do this only for real screen */
     for(screen = 0; screen < ScreenCount(dpy); screen++)
     {

config.c

@@ -32,6 +32,7 @@
 #include "screen.h"
 #include "widget.h"
 #include "xutil.h"
+#include "ewmh.h"
 #include "defconfig.h"
 
 #define AWESOME_CONFIG_FILE ".awesomerc" 
@@ -638,6 +639,8 @@ config_parse(const char *confpatharg)
         else
             eprint("fatal: no tags found in configuration file\n");
 
+        ewmh_update_net_numbers_of_desktop(get_phys_screen(screen));
+
         /* select first tag by default */
         virtscreen->tags[0].selected = True;
         virtscreen->tags[0].was_selected = True;

ewmh.c

@@ -20,6 +20,7 @@
  */
 
 #include <X11/Xatom.h>
+#include <X11/Xmd.h>
 
 #include "ewmh.h"
 #include "util.h"
@@ -28,6 +29,7 @@ extern AwesomeConf globalconf;
 
 static Atom net_supported;
 static Atom net_client_list;
+static Atom net_number_of_desktops;
 
 static Atom net_wm_name;
 static Atom net_wm_icon;
@@ -42,6 +44,7 @@ static AtomItem AtomNames[] =
 {
     { "_NET_SUPPORTED", &net_supported },
     { "_NET_CLIENT_LIST", &net_client_list },
+    { "_NET_NUMBER_OF_DESKTOPS", &net_number_of_desktops },
 
     { "_NET_WM_NAME", &net_wm_name },
     { "_NET_WM_ICON", &net_wm_icon },
@@ -71,6 +74,7 @@ ewmh_set_supported_hints(int phys_screen)
 
     atom[i++] = net_supported;
     atom[i++] = net_client_list;
+    atom[i++] = net_number_of_desktops;
     
     atom[i++] = net_wm_name;
     atom[i++] = net_wm_icon;
@@ -104,4 +108,17 @@ ewmh_update_net_client_list(int phys_screen)
     XFlush(globalconf.display);
 }
 
+void
+ewmh_update_net_numbers_of_desktop(int phys_screen)
+{
+    CARD32 count = 0;
+    Tag *tag;
+
+    for(tag = globalconf.screens[phys_screen].tags; tag; tag = tag->next)
+        count++;
+
+    XChangeProperty(globalconf.display, RootWindow(globalconf.display, phys_screen),
+                    net_number_of_desktops, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &count, 1);
+}
+
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80

ewmh.h

@@ -25,6 +25,7 @@
 void ewmh_init_atoms(void);
 void ewmh_set_supported_hints(int);
 void ewmh_update_net_client_list(int);
+void ewmh_update_net_numbers_of_desktop(int);
 
 #endif
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80