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--[[
Licensed under GNU General Public License v2
* (c) 2013, Luke Bonham
* (c) 2010-2012, Peter Hofmann
--]]
local first_line = require("lain.helpers").first_line
local newtimer = require("lain.helpers").newtimer
local wibox = require("wibox")
local math = { ceil = math.ceil }
local string = { format = string.format,
gmatch = string.gmatch }
local tostring = tostring
local setmetatable = setmetatable
-- CPU usage
-- lain.widgets.cpu
local cpu = {
last_total = 0,
last_active = 0
}
local function worker(args)
local args = args or {}
local timeout = args.timeout or 5
local settings = args.settings or function() end
cpu.widget = wibox.widget.textbox('')
function update()
-- Read the amount of time the CPUs have spent performing
-- different kinds of work. Read the first line of /proc/stat
-- which is the sum of all CPUs.
local times = first_line("/proc/stat")
local at = 1
local idle = 0
local total = 0
for field in string.gmatch(times, "[%s]+([^%s]+)")
do
-- 3 = idle, 4 = ioWait. Essentially, the CPUs have done
-- nothing during these times.
if at == 3 or at == 4
then
idle = idle + field
end
total = total + field
at = at + 1
end
local active = total - idle
-- Read current data and calculate relative values.
local dactive = active - cpu.last_active
local dtotal = total - cpu.last_total
cpu_now = {}
cpu_now.usage = tostring(math.ceil((dactive / dtotal) * 100))
widget = cpu.widget
settings()
-- Save current data for the next run.
cpu.last_active = active
cpu.last_total = total
end
newtimer("cpu", timeout, update)
return cpu.widget
end
return setmetatable(cpu, { __call = function(_, ...) return worker(...) end })
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