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6019f3257e07d10d891070caa352eda2d5655bc0
[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 = { last_total = 0, last_active = 0 }
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 = first_line("/proc/stat")
38         local at = 1
39         local idle = 0
40         local total = 0
41         for field in string.gmatch(times, "[%s]+([^%s]+)")
42         do
43             -- 4 = idle, 5 = ioWait. Essentially, the CPUs have done
44             -- nothing during these times.
45             if at == 4 or at == 5
46             then
47                 idle = idle + field
48             end
49             total = total + field
50             at = at + 1
51         end
52         local active = total - idle
53         
54         if cpu.last_active ~= active or cpu.last_total ~= total then
55             -- Read current data and calculate relative values.
56             local dactive = active - cpu.last_active
57             local dtotal = total - cpu.last_total
58
59             cpu_now = {}
60             cpu_now.usage = tostring(math.ceil((dactive / dtotal) * 100))
61
62             widget = cpu.widget
63             settings()
64
65             -- Save current data for the next run.
66             cpu.last_active = active
67             cpu.last_total = total
68         end
69     end
70
71     newtimer("cpu", timeout, update)
72
73     return cpu.widget
74 end
75
76 return setmetatable(cpu, { __call = function(_, ...) return worker(...) end })