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9406e0d64fb3e716401a2ccb66be1798a2831d87
[etc/awesome.git] / widget / alsa.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2013, Luke Bonham                     
6       * (c) 2010, Adrian C. <anrxc@sysphere.org>  
7                                                   
8 --]]
9
10 local helpers      = require("lain.helpers")
11 local shell        = require("awful.util").shell
12 local wibox        = require("wibox")
13 local string       = { match  = string.match,
14                        format = string.format }
15 local setmetatable = setmetatable
16
17 -- ALSA volume
18 -- lain.widget.alsa
19
20 local function worker(args)
21     local alsa     = { widget = wibox.widget.textbox() }
22     local args     = args or {}
23     local timeout  = args.timeout or 5
24     local settings = args.settings or function() end
25
26     alsa.cmd           = args.cmd or "amixer"
27     alsa.channel       = args.channel or "Master"
28     alsa.togglechannel = args.togglechannel
29
30     local format_cmd = string.format("%s get %s", alsa.cmd, alsa.channel)
31
32     if alsa.togglechannel then
33         format_cmd = { shell, "-c", string.format("%s get %s; %s get %s",
34         alsa.cmd, alsa.channel, alsa.cmd, alsa.togglechannel) }
35     end
36
37     alsa.last = {}
38
39     function alsa.update()
40         helpers.async(format_cmd, function(mixer)
41             local l,s = string.match(mixer, "([%d]+)%%.*%[([%l]*)")
42             if alsa.last.level ~= l or alsa.last.status ~= s then
43                 volume_now = { level = l, status = s }
44                 widget = alsa.widget
45                 settings()
46                 alsa.last = volume_now
47             end
48         end)
49     end
50
51     helpers.newtimer(string.format("alsa-%s-%s", alsa.cmd, alsa.channel), timeout, alsa.update)
52
53     return alsa
54 end
55
56 return setmetatable({}, { __call = function(_, ...) return worker(...) end })