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readme updated
[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 markup       = require("lain.util.markup")
11 local first_line   = require("lain.helpers").first_line
12
13 local beautiful    = require("beautiful")
14 local wibox        = require("wibox")
15
16 local math         = { ceil   = math.ceil }
17 local string       = { format = string.format,
18                        gmatch = string.gmatch }
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 function worker(args)
30     local args = args or {}
31     local refresh_timeout = args.refresh_timeout or 5
32     local header = args.header or " Cpu "
33     local header_color = args.header or beautiful.fg_normal or "#FFFFFF"
34     local color = args.color or beautiful.fg_focus or "#FFFFFF"
35     local footer = args.footer or "%"
36
37     local w = wibox.widget.textbox()
38
39     local cpuusageupdate = function()
40         -- Read the amount of time the CPUs have spent performing
41         -- different kinds of work. Read the first line of /proc/stat
42         -- which is the sum of all CPUs.
43         local times = first_line("/proc/stat")
44         local at = 1
45         local idle = 0
46         local total = 0
47         for field in string.gmatch(times, "[%s]+([^%s]+)")
48         do
49             -- 3 = idle, 4 = ioWait. Essentially, the CPUs have done
50             -- nothing during these times.
51             if at == 3 or at == 4
52             then
53                 idle = idle + field
54             end
55             total = total + field
56             at = at + 1
57         end
58         local active = total - idle
59
60         -- Read current data and calculate relative values.
61         local dactive = active - cpu.last_active
62         local dtotal = total - cpu.last_total
63         local dta = math.ceil((dactive / dtotal) * 100)
64
65         w:set_markup(markup(header_color, header) .. markup(color, dta .. footer) .. " ")
66
67         -- Save current data for the next run.
68         cpu.last_active = active
69         cpu.last_total = total
70     end
71
72     local cpuusagetimer = timer({ timeout = refresh_timeout })
73     cpuusagetimer:connect_signal("timeout", cpuusageupdate)
74     cpuusagetimer:start()
75     cpuusagetimer:emit_signal("timeout")
76
77     return w
78 end
79
80 return setmetatable(cpu, { __call = function(_, ...) return worker(...) end })