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[etc/awesome.git] / .config / awesome / lain / widget / cpu.lua
1 --[[
2
3      Licensed under GNU General Public License v2
4       * (c) 2013,      Luca CPZ
5       * (c) 2010-2012, Peter Hofmann
6
7 --]]
8
9 local helpers  = require("lain.helpers")
10 local wibox    = require("wibox")
11 local math     = math
12 local string   = string
13 local tostring = tostring
14
15 -- CPU usage
16 -- lain.widget.cpu
17
18 local function factory(args)
19     local cpu      = { core = {}, widget = wibox.widget.textbox() }
20     local args     = args or {}
21     local timeout  = args.timeout or 2
22     local settings = args.settings or function() end
23
24     function cpu.update()
25         -- Read the amount of time the CPUs have spent performing
26         -- different kinds of work. Read the first line of /proc/stat
27         -- which is the sum of all CPUs.
28         for index,time in pairs(helpers.lines_match("cpu","/proc/stat")) do
29             local coreid = index - 1
30             local core   = cpu.core[coreid] or
31                            { last_active = 0 , last_total = 0, usage = 0 }
32             local at     = 1
33             local idle   = 0
34             local total  = 0
35
36             for field in string.gmatch(time, "[%s]+([^%s]+)") do
37                 -- 4 = idle, 5 = ioWait. Essentially, the CPUs have done
38                 -- nothing during these times.
39                 if at == 4 or at == 5 then
40                     idle = idle + field
41                 end
42                 total = total + field
43                 at = at + 1
44             end
45
46             local active = total - idle
47
48             if core.last_active ~= active or core.last_total ~= total then
49                 -- Read current data and calculate relative values.
50                 local dactive = active - core.last_active
51                 local dtotal  = total - core.last_total
52                 local usage   = math.ceil((dactive / dtotal) * 100)
53
54                 core.last_active = active
55                 core.last_total  = total
56                 core.usage       = usage
57
58                 -- Save current data for the next run.
59                 cpu.core[coreid] = core
60             end
61         end
62
63         cpu_now = cpu.core
64         cpu_now.usage = cpu_now[0].usage
65         widget = cpu.widget
66
67         settings()
68     end
69
70     helpers.newtimer("cpu", timeout, cpu.update)
71
72     return cpu
73 end
74
75 return factory