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f307b26b3bcc021218555ca0f65ef7e800183209
[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 first_line   = require("lain.helpers").first_line
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 = {
25     last_total = 0,
26     last_active = 0
27 }
28
29 local function worker(args)
30     local args     = args or {}
31     local timeout  = args.timeout or 5
32     local settings = args.settings or function() end
33
34     cpu.widget = wibox.widget.textbox('')
35
36     function cpu.update()
37         -- Read the amount of time the CPUs have spent performing
38         -- different kinds of work. Read the first line of /proc/stat
39         -- which is the sum of all CPUs.
40         local times = first_line("/proc/stat")
41         local at = 1
42         local idle = 0
43         local total = 0
44         for field in string.gmatch(times, "[%s]+([^%s]+)")
45         do
46             -- 3 = idle, 4 = ioWait. Essentially, the CPUs have done
47             -- nothing during these times.
48             if at == 3 or at == 4
49             then
50                 idle = idle + field
51             end
52             total = total + field
53             at = at + 1
54         end
55         local active = total - idle
56
57         -- Read current data and calculate relative values.
58         local dactive = active - cpu.last_active
59         local dtotal = total - cpu.last_total
60
61         usage = tostring(math.ceil((dactive / dtotal) * 100))
62
63         widget = cpu.widget
64         settings()
65
66         -- Save current data for the next run.
67         cpu.last_active = active
68         cpu.last_total = total
69     end
70
71     newtimer("cpu", timeout, cpu.update)
72
73     return cpu.widget
74 end
75
76 return setmetatable(cpu, { __call = function(_, ...) return worker(...) end })