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Merge pull request #420 from sim590/unpack-lua51-compat
[etc/awesome.git] / widget / alsa.lua
1 --[[
2
3      Licensed under GNU General Public License v2
4       * (c) 2013, Luca CPZ
5       * (c) 2010, Adrian C. <anrxc@sysphere.org>
6
7 --]]
8
9 local helpers = require("lain.helpers")
10 local shell   = require("awful.util").shell
11 local wibox   = require("wibox")
12 local string  = string
13
14 -- ALSA volume
15 -- lain.widget.alsa
16
17 local function factory(args)
18     local alsa     = { widget = wibox.widget.textbox() }
19     local args     = args or {}
20     local timeout  = args.timeout or 5
21     local settings = args.settings or function() end
22
23     alsa.cmd           = args.cmd or "amixer"
24     alsa.channel       = args.channel or "Master"
25     alsa.togglechannel = args.togglechannel
26
27     local format_cmd = string.format("%s get %s", alsa.cmd, alsa.channel)
28
29     if alsa.togglechannel then
30         format_cmd = { shell, "-c", string.format("%s get %s; %s get %s",
31         alsa.cmd, alsa.channel, alsa.cmd, alsa.togglechannel) }
32     end
33
34     alsa.last = {}
35
36     function alsa.update()
37         helpers.async(format_cmd, function(mixer)
38             local l,s = string.match(mixer, "([%d]+)%%.*%[([%l]*)")
39             if alsa.last.level ~= l or alsa.last.status ~= s then
40                 volume_now = { level = l, status = s }
41                 widget = alsa.widget
42                 settings()
43                 alsa.last = volume_now
44             end
45         end)
46     end
47
48     helpers.newtimer(string.format("alsa-%s-%s", alsa.cmd, alsa.channel), timeout, alsa.update)
49
50     return alsa
51 end
52
53 return factory