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readme updated
[etc/awesome.git] / widgets / mem.lua
1
2 --[[
3                                                            
4      Licensed under GNU General Public License v2          
5       * (c) 2013,      Luke Bonham                         
6       * (c) 2010-2012, Peter Hofmann                       
7       * (c) 2010,      Adrian C.      <anrxc@sysphere.org> 
8       * (c) 2009,      Lucas de Vries <lucas@glacicle.com> 
9                                                            
10 --]]
11
12 local markup          = require("lain.util.markup")
13 local run_in_terminal = require("lain.helpers").run_in_terminal
14
15 local beautiful       = require("beautiful")
16 local wibox           = require("wibox")
17
18 local io              = { lines  = io.lines }
19 local math            = { floor  = math.floor }
20 local string          = { format = string.format,
21                           gmatch = string.gmatch,
22                           len    = string.len }
23
24 local setmetatable    = setmetatable
25
26 -- Memory usage (ignoring caches)
27 -- lain.widgets.mem
28 local mem = {}
29
30 function worker(args)
31     local args = args or {}
32     local refresh_timeout = args.refresh_timeout or 10
33     local show_swap = args.show_swap or false
34     local show_total = args.show_total or false
35     local header = args.header or " Mem "
36     local header_color = args.header or beautiful.fg_normal or "#FFFFFF"
37     local color = args.color or beautiful.fg_focus or "#FFFFFF"
38     local footer = args.footer or "MB"
39
40     local widg = wibox.widget.textbox()
41
42     local upd = function()
43         local mem = {}
44         for line in io.lines("/proc/meminfo")
45         do
46             for k, v in string.gmatch(line, "([%a]+):[%s]+([%d]+).+")
47             do
48                 if     k == "MemTotal"  then mem.total = math.floor(v / 1024)
49                 elseif k == "MemFree"   then mem.free  = math.floor(v / 1024)
50                 elseif k == "Buffers"   then mem.buf   = math.floor(v / 1024)
51                 elseif k == "Cached"    then mem.cache = math.floor(v / 1024)
52                 elseif k == "SwapTotal" then mem.swap  = math.floor(v / 1024)
53                 elseif k == "SwapFree"  then mem.swapf = math.floor(v / 1024)
54                 end
55             end
56         end
57
58         used = mem.total - (mem.free + mem.buf + mem.cache)
59         swapused = mem.swap - mem.swapf
60
61         if show_total
62         then
63             local fmt = "%" .. string.len(mem.total) .. ".0f/%.0f"
64             widg:set_markup(markup(header_color, header) ..
65                             markup(color, string.format(fmt, used, mem.total) .. footer .. " "))
66         else
67             widg:set_markup(markup(header_color, header) ..
68                             markup(color, used .. footer .. " "))
69         end
70
71         if show_swap
72         then
73             widg:set_markup(widg._layout.text .. ' ('
74                             .. string.format('%.0f '.. footer, swapused)
75                             .. ') ')
76         end
77     end
78
79     local tmr = timer({ timeout = refresh_timeout })
80     tmr:connect_signal("timeout", upd)
81     tmr:start()
82     tmr:emit_signal("timeout")
83
84     return widg
85 end
86
87 return setmetatable(mem, { __call = function(_, ...) return worker(...) end })