awesome: Add calendar widget

home/.config/awesome/rc.lua

@@ -107,6 +107,10 @@ menubar.utils.terminal = terminal -- Set the terminal for applications that requ
 -- Create a textclock widget
 mytextclock = wibox.widget.textclock()
 
+-- Create calendar and attach it to textclock
+mycal = widgets.cal
+mycal.attach(mytextclock)
+
 -- Create a wibox for each screen and add it
 local taglist_buttons = gears.table.join(
                     awful.button({ }, 1, function(t) t:view_only() end),

home/.config/awesome/widgets.lua

@@ -1,6 +1,7 @@
 local awful = require("awful")
-local wibox = require("wibox")
 local gtable = require("gears.table")
+local naughty = require("naughty")
+local wibox = require("wibox")
 
 local lain = require("lain")
 local helpers = require("lain.helpers")
@@ -187,4 +188,29 @@ widgets.tearstop:buttons(
     )
 )
 
+widgets.cal = {}
+
+widgets.cal.show = function()
+    widgets.cal.hide()
+
+    helpers.async({ "khal", "calendar" }, function(output)
+        widgets.cal.notification = naughty.notify{
+            screen  = awful.screen.focused(),
+            text    = output:gsub("\n$", ""),
+            timeout = 0,
+        }
+    end)
+end
+
+widgets.cal.hide = function()
+    if not widgets.cal.notification then return end
+    naughty.destroy(widgets.cal.notification)
+    widgets.cal.notification = nil
+end
+
+widgets.cal.attach = function(parent)
+    parent:connect_signal("mouse::enter", widgets.cal.show)
+    parent:connect_signal("mouse::leave", widgets.cal.hide)
+end
+
 return widgets