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widgets: no global tables, but one instance per call; closes #336; closes #337
[etc/awesome.git] / widget / 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
17 -- CPU usage
18 -- lain.widget.cpu
19
20 local function factory(args)
21     local cpu      = { core = {}, widget = wibox.widget.textbox() }
22     local args     = args or {}
23     local timeout  = args.timeout or 2
24     local settings = args.settings or function() end
25
26     function cpu.update()
27         -- Read the amount of time the CPUs have spent performing
28         -- different kinds of work. Read the first line of /proc/stat
29         -- which is the sum of all CPUs.
30         local times = helpers.lines_match("cpu","/proc/stat")
31
32         for index,time in pairs(times) do
33             local coreid = index - 1
34             local core   = cpu.core[coreid] or
35                            { last_active = 0 , last_total = 0, usage = 0 }
36             local at     = 1
37             local idle   = 0
38             local total  = 0
39
40             for field in string.gmatch(time, "[%s]+([^%s]+)") do
41                 -- 4 = idle, 5 = ioWait. Essentially, the CPUs have done
42                 -- nothing during these times.
43                 if at == 4 or at == 5 then
44                     idle = idle + field
45                 end
46                 total = total + field
47                 at = at + 1
48             end
49
50             local active = total - idle
51
52             if core.last_active ~= active or core.last_total ~= total then
53                 -- Read current data and calculate relative values.
54                 local dactive = active - core.last_active
55                 local dtotal  = total - core.last_total
56                 local usage   = math.ceil((dactive / dtotal) * 100)
57
58                 core.last_active = active
59                 core.last_total  = total
60                 core.usage       = usage
61
62                 -- Save current data for the next run.
63                 cpu.core[coreid] = core
64             end
65         end
66
67         cpu_now = cpu.core
68         cpu_now.usage = cpu_now[0].usage
69         widget = cpu.widget
70
71         settings()
72     end
73
74     helpers.newtimer("cpu", timeout, cpu.update)
75
76     return cpu
77 end
78
79 return factory