Add "expose" feature ala mac OS X to display all client of a screen

Feature #100 requested by shibo

src/config.c

@@ -98,6 +98,7 @@ const func_name_list_t func_list[] =
      {"clientlist",               uicb_clientlist },
      {"check_clist",              uicb_checkclist },
      {"toggle_tagautohide",       uicb_toggle_tagautohide },
+     {"toggle_tag_expose",        uicb_tag_toggle_expose},
      {NULL, NULL}
 };
 
@@ -501,6 +502,8 @@ conf_tag_section(void)
      conf.border.tag              = fetch_opt_first(sec, "false", "border").bool;
      conf.tagautohide             = fetch_opt_first(sec, "false", "autohide").bool;
      conf.tagnamecount            = fetch_opt_first(sec, "false", "name_count").bool;
+     conf.tag_expose_name         = fetch_opt_first(sec, "EXPOSE", "expose_name").str;
+     conf.expose_layout           = fetch_opt_first(sec, "tile_grid_vertical", "expose_layout").str;
 
      def_tag = fetch_section_first(sec, "default_tag");
 

src/structs.h

@@ -499,6 +499,8 @@ typedef struct
      Bool layout_system; /* Switch: False, Menu: True. */
      Bool layout_placement; /* Right (normal): False, Left: True. */
      Bool keep_layout_geo;
+     char *tag_expose_name;
+     char *expose_layout;
      char *selected_layout_symbol;
      /* Number of... */
      int nkeybind;

src/tag.c

@@ -734,3 +734,43 @@ uicb_tag_rename(uicb_t cmd)
 
      return;
 }
+
+void
+uicb_tag_toggle_expose(uicb_t cmd)
+{
+     (void)cmd;
+     int i;
+
+     screen_get_sel();
+
+     for(i = 1; i <= conf.ntag[selscreen]; i++)
+     {
+          if(strcmp(tags[selscreen][i].name, conf.tag_expose_name) == 0)
+          {
+               tag_set(sel->tag);
+               arrange(selscreen, True);
+               tag_delete(selscreen, i);
+               return;
+          }
+     }
+     
+     tag_new(selscreen, conf.tag_expose_name);
+
+     for(i = 0; i < conf.nlayout; ++i)
+     {
+          if(strcmp(conf.expose_layout, conf.layout[i].type) == 0)
+          {
+               tags[selscreen][conf.ntag[selscreen]].layout = conf.layout[i];
+          }
+     }
+
+     for(i = 1; i < conf.ntag[selscreen]; ++i)
+     {
+          tags[selscreen][conf.ntag[selscreen]].tagad ^= TagFlag(i);
+     }
+     
+     arrange(selscreen, True);
+     tags[selscreen][conf.ntag[selscreen]].request_update = True;
+
+     return;
+}

src/wmfs.h

@@ -300,6 +300,7 @@ void uicb_tag_del(uicb_t);
 void uicb_tag_rename(uicb_t cmd);
 void uicb_tag_last(uicb_t cmd);
 void uicb_tag_stay_last(uicb_t cmd);
+void uicb_tag_toggle_expose(uicb_t cmd);
 
 /* screen.c */
 int screen_count(void);

wmfsrc

@@ -124,6 +124,9 @@
         #default_name   = "new tag" # deprecated, use [default_tag] instead
         #default_layout = "tile_right" # deprecated, use [default_tag] instead
 
+        expose_name     = "EXPOSE"
+        expose_layout   = "tile_left"
+        
         # Border around the tag buttons.
         border      = true
 
@@ -431,6 +434,8 @@
         [key] mod = {"Super", "Shift"} key = "a" func = "client_screen_next" [/key]
         [key] mod = {"Super", "Shift"} key = "z" func = "client_screen_prev" [/key]
 
+        [key] mod = {"Alt"} key = "e" func = "toggle_tag_expose" [/key]
+
         # unlisted fonctions that can be used in [key] func = ""
         # client_focus_{right, left, top, bottom}
         # client_ignore_tag # Toggle the client in ignore_tag (display the client on all tags)