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[etc/awesome.git] / widgets / cpu.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2013,      Luke Bonham                
6       * (c) 2010-2012, Peter Hofmann              
7                                                   
8 --]]
9
10 local lines_match  = require("lain.helpers").lines_match
11 local newtimer     = require("lain.helpers").newtimer
12
13 local wibox        = require("wibox")
14
15 local math         = { ceil   = math.ceil }
16 local string       = { format = string.format,
17                        gmatch = string.gmatch }
18 local tostring     = tostring
19
20 local setmetatable = setmetatable
21
22 -- CPU usage
23 -- lain.widgets.cpu
24 local cpu = { core = {} }
25
26 local function worker(args)
27     local args     = args or {}
28     local timeout  = args.timeout or 2
29     local settings = args.settings or function() end
30
31     cpu.widget = wibox.widget.textbox('')
32
33     function update()
34         -- Read the amount of time the CPUs have spent performing
35         -- different kinds of work. Read the first line of /proc/stat
36         -- which is the sum of all CPUs.
37         local times = lines_match("cpu","/proc/stat")
38
39         for index,time in pairs(times) do
40             local coreid = index - 1
41             local core   = cpu.core[coreid] or
42                            { last_active = 0 , last_total = 0, usage = 0 }
43             local at     = 1
44             local idle   = 0
45             local total  = 0
46
47             for field in string.gmatch(time, "[%s]+([^%s]+)") do
48                 -- 4 = idle, 5 = ioWait. Essentially, the CPUs have done
49                 -- nothing during these times.
50                 if at == 4 or at == 5 then
51                     idle = idle + field
52                 end
53                 total = total + field
54                 at = at + 1
55             end
56
57             local active = total - idle
58
59             if core.last_active ~= active or core.last_total ~= total then
60                 -- Read current data and calculate relative values.
61                 local dactive = active - core.last_active
62                 local dtotal  = total - core.last_total
63                 local usage   = math.ceil((dactive / dtotal) * 100)
64
65                 core.last_active = active
66                 core.last_total  = total
67                 core.usage       = usage
68
69                 -- Save current data for the next run.
70                 cpu.core[coreid] = core
71             end
72         end
73
74         widget = cpu.widget
75         cpu_now = cpu.core
76         cpu_now.usage = cpu_now[0].usage
77
78         settings()
79     end
80
81     newtimer("cpu", timeout, update)
82
83     return cpu.widget
84 end
85
86 return setmetatable(cpu, { __call = function(_, ...) return worker(...) end })