modify alt-tab behaviour

awesome/keys.lua

@@ -307,15 +307,70 @@ keys.globalkeys = gears.table.join(
     -- Focus client by index (cycle through clients)
     awful.key({modkey}, "Tab",
         function()
-            awful.client.focus.byidx(1)
+            local screen = awful.screen.focused()
+            local tags = screen.tags
+            local current_tag = screen.selected_tag
+            local used_tags = {}
+            for _, t in ipairs(tags) do
+                if t == current_tag or #t:clients() > 0 then
+                    table.insert(used_tags, t)
+                end
+            end
+            local found = false
+            for _, t in ipairs(used_tags) do
+                if found then
+                    t:view_only()
+                    return
+                elseif t == current_tag then
+                    found = true
+                end
+            end
+            used_tags[1]:view_only()
         end,
-        {description = "focus next by index", group = "client"}
+        {description = "Switch to next tag", group = "client"}
     ),
     awful.key({modkey, "Shift"}, "Tab",
         function()
-            awful.client.focus.byidx(-1)
+            local tags = root.tags()
+            local current_tag = awful.screen.focused().selected_tag
+            local used_tags = {}
+            for _, t in ipairs(tags) do
+                if t == current_tag or #t:clients() > 0 then
+                    table.insert(used_tags, t)
+                end
+            end
+            local found = false
+            for _, t in ipairs(used_tags) do
+                if found then
+                    awful.screen.focus(t.screen.index)
+                    t:view_only()
+                    return
+                elseif t == current_tag then
+                    found = true
+                end
+            end
+            used_tags[1]:view_only()
         end,
-        {description = "focus previous by index", group = "client"}
+        {description = "Switch to next tag", group = "client"}
+    ),
+    -- Focus client by index (cycle through clients)
+    awful.key({modkey}, "t",
+        function()
+            local screen = awful.screen.focused()
+            local tags = screen.tags
+            local first_empty = nil
+            for _, t in ipairs(tags) do
+                if #t:clients() > 0 then
+                    first_empty = nil
+                elseif first_empty == nil then
+                    first_empty = t
+                end
+            end
+            if first_empty ~= nil then
+                first_empty:view_only()
+            end
+        end,
+        {description = "Switch to next tag", group = "client"}
     ),
 
     -- =========================================