conky-config/drawing/System.lua

local M = {}

local Text 			= require 'Text'
local Line 			= require 'Line'
local TextColumn	= require 'TextColumn'
local Util			= require 'Util'

local __string_match = string.match

local _TEXT_SPACING_ = 20

local extract_date = function(cmd)
	local yyyy, mm_dd = __string_match(Util.execute_cmd(cmd), '%[(%d-)%-(%d-%-%d-)%s')
	return mm_dd..'-'..yyyy
end

local header = _G_Widget_.Header{
	x = _G_INIT_DATA_.LEFT_X,
	y = _G_INIT_DATA_.TOP_Y,
	width = _G_INIT_DATA_.SECTION_WIDTH,
	header = 'SYSTEM'
}

local labels = _G_Widget_.TextColumn{
	x 		= _G_INIT_DATA_.LEFT_X,
	y 		= header.bottom_y,
	spacing = _TEXT_SPACING_,
	'Kernel',
	'Uptime',
	'Last Upgrade',
	'Last Sync'
}
local info = _G_Widget_.TextColumn{
	x 			= _G_INIT_DATA_.LEFT_X + _G_INIT_DATA_.SECTION_WIDTH,
	y 			= header.bottom_y,
	spacing 	= _TEXT_SPACING_,
	x_align 	= 'right',
	text_color 	= _G_Patterns_.BLUE,
	Util.conky('$kernel'),
	'<row2>',
	'<row3>',
	'<row4>'
}

_TEXT_SPACING_ = nil

local draw_static = function(cr)
   Text.draw(header.text, cr)
   Line.draw(header.underline, cr)
   TextColumn.draw(labels, cr)
end

local draw_dynamic = function(cr, log_is_changed)
   TextColumn.set(info, cr, 2, Util.conky('$uptime'))
   
   if log_is_changed then
	  TextColumn.set(info, cr, 3, extract_date("sed -n "..
	    "'/ starting full system upgrade/p' /var/log/pacman.log | tail -1"))
	  TextColumn.set(info, cr, 4, extract_date("sed -n "..
		"'/ synchronizing package lists/p' /var/log/pacman.log | tail -1"))
   end
   
   TextColumn.draw(info, cr)
end

M.draw_static = draw_static
M.draw_dynamic = draw_dynamic

return M