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