Add a taskbar that is only shown on maximized tags

rc.lua

@@ -33,6 +33,7 @@ tags.setup()
 -- {{{ widgets
 widgets = require("widgets")
 awful.screen.connect_for_each_screen(function(s)
+    widgets.dynamic_taskbar(s)
     widgets(s).left(
 	{
 	    widgets.screennum(s),

widgets.lua

@@ -223,6 +223,68 @@ function widgets.battery(s)
 	return combined_bats
 end
 
+local tasklist_buttons = gears.table.join(
+                     awful.button({ }, 1, function(c)
+                                              if c == client.focus then
+                                                  c.minimized = true
+                                              else
+                                                  c:emit_signal("request::activate", "tasklist", {raise = true})
+                                              end
+                                          end),
+                     awful.button({ }, 3, function() awful.menu.client_list({ theme = { width = 250 } }) end),
+                     awful.button({ }, 4, function() awful.client.focus.byidx(1) end),
+                     awful.button({ }, 5, function() awful.client.focus.byidx(-1) end))
+
+-- display a taskbar
+-- `when` is a function taking the current screen, that is called on the given signal, and should return true if the
+-- taskbar should be shown.
+-- If signal and when are not given, the taskbar will be visible on tags with "max" layout
+function widgets.dynamic_taskbar(s, signal, when)
+	s.mytasklist = awful.widget.tasklist {
+		screen   = s,
+		filter   = awful.widget.tasklist.filter.currenttags,
+		style    = {
+			shape_border_width = 2,
+			bg_focus = beautiful.bg_focus,
+			shape_border_color = beautiful.border_focus,
+			shape = gears.shape.powerline,
+			spacing = -s.dpi / 8,
+		},
+		widget_template = {
+			{
+				{
+					{
+						{ id     = 'icon_role',
+						widget = wibox.widget.imagebox, },
+						margins = 2,
+						widget  = wibox.container.margin,
+					},
+					{ id     = 'text_role',
+					widget = wibox.widget.textbox, },
+					layout = wibox.layout.fixed.horizontal,
+				},
+				left  = 20,
+				right = 15,
+				widget = wibox.container.margin
+			},
+			id     = 'background_role',
+			widget = wibox.container.background,
+		},
+	}
+	s.taskbar = awful.wibar({
+		position = "top",
+		screen = s,
+		opacity = 0.8,
+		height = math.floor(s.dpi / 4),
+		widget = s.mytasklist
+	})
+
+	condition = when or function(s) return awful.layout.get(s).name == "max" end
+	s:connect_signal(signal or "tag::history::update", function()
+		s.taskbar.visible = condition(s)
+	end)
+end
+
 -- name is ignored and there for backwards compatibility. will simply update all
 -- widgets registered with vicious
 function widgets.update(name)