cal.lua

-- original code made by Bzed and published on http://awesome.naquadah.org/wiki/Calendar_widget
-- modified by Marc Dequènes (Duck) <Duck@DuckCorp.org> (2009-12-29), under the same licence,
-- and with the following changes:
--   + transformed to module
--   + the current day formating is customizable
-- modified by Jörg Thalheim (Mic92) <jthalheim@gmail.com> (2011), under the same licence,
-- and with the following changes:
--   + use tooltip instead of naughty.notify
--   + rename it to cal
--
-- # How to Install #
-- 1. Download the code and move it into your config directory
--	wget --no-check-certificate https://github.com/Mic92/awesome-dotfiles/raw/master/cal.lua -O $XDG_CONFIG_HOME/awesome/cal.lua
-- 2. require it in your rc.lua
-- 	require("cal")
-- 3. attach the calendar to a widget of your choice (ex mytextclock)
--	cal.register(mytextclock)
--    If you don't like the default current day formating you can change it as following
--	cal.register(mytextclock, "<b>%s</b>") -- now the current day is bold instead of underlined
--
-- # How to Use #
-- Just hover with your mouse over the widget, you register and the calendar popup.
-- On clicking or by using the mouse wheel the displayed month changes.
-- Pressing Shift + Mouse click change the year.

local string = {format = string.format}
local os = {date = os.date, time = os.time}
local awful = require("awful")

module("cal")

local tooltip
local state = {}
local current_day_format = "<b>%s</b>"

function displayMonth(month,year,weekStart)
	local t,wkSt=os.time{year=year, month=month+1, day=0},weekStart or 1
	local d=os.date("*t",t)
	local mthDays,stDay=d.day,(d.wday-d.day-wkSt+1)%7

	local lines = "    "

	for x=0,6 do
		lines = lines .. os.date("%a ",os.time{year=2006,month=1,day=x+wkSt})
	end

	lines = lines .. "\n" .. os.date(" %V",os.time{year=year,month=month,day=1})

	local writeLine = 1
	while writeLine < (stDay + 1) do
		lines = lines .. "    "
		writeLine = writeLine + 1
	end

	for d=1,mthDays do
		local x = d
		local t = os.time{year=year,month=month,day=d}
		if writeLine == 8 then
			writeLine = 1
		lines = lines .. "\n" .. os.date(" %V",t)
		end
		if os.date("%Y-%m-%d") == os.date("%Y-%m-%d", t) then
			x = string.format(current_day_format, d)
		end
		if d < 10 then
			x = " " .. x
		end
		lines = lines .. "  " .. x
		writeLine = writeLine + 1
	end
	local header = os.date("%B %Y\n",os.time{year=year,month=month,day=1})

	return header .. "\n" .. lines
end

function register(mywidget, custom_current_day_format)
	if custom_current_day_format then current_day_format = custom_current_day_format end

	if not tooltip then
		tooltip = awful.tooltip({})
	end
	tooltip:add_to_object(mywidget)

	mywidget:connect_signal("mouse::enter", function()
		local month, year = os.date('%m'), os.date('%Y')
		state = {month, year}
		tooltip:set_text(string.format('<span font_desc="Terminus">%s</span>', displayMonth(month, year, 2)))
	end)
	mywidget:buttons(awful.util.table.join(
	awful.button({ }, 1, function()
		switchMonth(-1)
	end),
	awful.button({ }, 3, function()
		switchMonth(1)
	end),
	awful.button({ }, 4, function()
		switchMonth(-1)
	end),
	awful.button({ }, 5, function()
		switchMonth(1)
	end),
	awful.button({ 'Shift' }, 1, function()
		switchMonth(-12)
	end),
	awful.button({ 'Shift' }, 3, function()
		switchMonth(12)
	end),
	awful.button({ 'Shift' }, 4, function()
		switchMonth(-12)
	end),
	awful.button({ 'Shift' }, 5, function()
		switchMonth(12)
	end)))
end

function switchMonth(delta)
	state[1] = state[1] + (delta or 1)
	local text = string.format('<span font_desc="Terminus">%s</span>', displayMonth(state[1], state[2], 2))
	tooltip:set_text(text)
end