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