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local wibox = require("wibox")
local widgets = require("util.widgets")
-- this is directly adapted from slstatus's cpu.c module
local cpu_time = { 0,0,0,0,0,0,0 } -- user, nice, system, idle, iowait, irq, softirq
function linux_cpu_usage(widget)
-- read stat
local statf = io.open("/proc/stat")
local stat_iter = statf:read():gmatch("%d+")
statf:close()
-- calc
local sum = 0
local a, b = cpu_time, {} -- set cpu_time as a for smaller code
table.move(a, 1, 7, 1, b) -- copy first 7 to b
for i = 1, 7 do
a[i] = stat_iter()
sum = sum + b[i] - a[i]
end
if sum == 0 then
return
end
local usage = ((b[1] + b[2] + b[3] + b[6] + b[7]) -
(a[1] + a[2] + a[3] + a[6] + a[7])) * 100 / sum
widget:set_text(math.floor(usage))
end
-- return correct widget for os
if osname == "Linux" then
return widgets.watchfn(linux_cpu_usage, 5)
end
return wibox.widget.textbox("unsupported os")
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