return to active tag on restart

configs/awesome/signals/init.lua

@@ -93,3 +93,44 @@ client.connect_signal(
         c.border_color = Beautiful.border_normal
     end
 )
+
+awesome.connect_signal(
+    'exit',
+    function(reason_restart)
+        if not reason_restart then
+            return
+        end
+
+        local file = io.open('/tmp/awesomewm-last-selected-tags', 'w+')
+
+        for s in screen do
+            file:write(s.selected_tag.index, '\n')
+        end
+
+        file:close()
+    end
+)
+
+awesome.connect_signal(
+    'startup',
+    function()
+        local file = io.open('/tmp/awesomewm-last-selected-tags', 'r')
+        if not file then
+            return
+        end
+
+        local selected_tags = {}
+
+        for line in file:lines() do
+            table.insert(selected_tags, tonumber(line))
+        end
+
+        for s in screen do
+            local i = selected_tags[s.index]
+            local t = s.tags[i]
+            t:view_only()
+        end
+
+        file:close()
+    end
+)