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wiki updated; closes #236
[etc/awesome.git] / widgets / 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 newtimer     = require("lain.helpers").newtimer
11 local read_pipe    = require("lain.helpers").read_pipe
12
13 local wibox        = require("wibox")
14
15 local string       = { match  = string.match,
16                        format = string.format }
17
18 local setmetatable = setmetatable
19
20 -- ALSA volume
21 -- lain.widgets.alsa
22 local alsa = { last_level = "0", last_status = "" }
23
24 local function worker(args)
25     local args     = args or {}
26     local timeout  = args.timeout or 5
27     local settings = args.settings or function() end
28
29     alsa.cmd           = args.cmd or "amixer"
30     alsa.channel       = args.channel or "Master"
31     alsa.togglechannel = args.togglechannel
32     alsa.widget        = wibox.widget.textbox('')
33
34     function alsa.update()
35         mixer = read_pipe(string.format("%s get %s", alsa.cmd, alsa.channel))
36         l,s   = string.match(mixer, "([%d]+)%%.*%[([%l]*)")
37
38         -- HDMIs can have a channel different from Master for toggling mute
39         if alsa.togglechannel then
40             s = string.match(read_pipe(string.format("%s get %s", alsa.cmd, alsa.togglechannel)), "%[(%a+)%]")
41         end
42
43         if alsa.last_level ~= l or alsa.last_status ~= s then
44             volume_now = { level = l, status = s }
45             alsa.last_level  = l
46             alsa.last_status = s
47
48             widget = alsa.widget
49             settings()
50         end
51     end
52
53     timer_id = string.format("alsa-%s-%s", alsa.cmd, alsa.channel)
54     newtimer(timer_id, timeout, alsa.update)
55
56     return setmetatable(alsa, { __index = alsa.widget })
57 end
58
59 return setmetatable(alsa, { __call = function(_, ...) return worker(...) end })