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[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  = { match  = string.match,
13                   format = string.format }
14
15 -- ALSA volume
16 -- lain.widget.alsa
17
18 local function factory(args)
19     local alsa     = { widget = wibox.widget.textbox() }
20     local args     = args or {}
21     local timeout  = args.timeout or 5
22     local settings = args.settings or function() end
23
24     alsa.cmd           = args.cmd or "amixer"
25     alsa.channel       = args.channel or "Master"
26     alsa.togglechannel = args.togglechannel
27
28     local format_cmd = string.format("%s get %s", alsa.cmd, alsa.channel)
29
30     if alsa.togglechannel then
31         format_cmd = { shell, "-c", string.format("%s get %s; %s get %s",
32         alsa.cmd, alsa.channel, alsa.cmd, alsa.togglechannel) }
33     end
34
35     alsa.last = {}
36
37     function alsa.update()
38         helpers.async(format_cmd, function(mixer)
39             local l,s = string.match(mixer, "([%d]+)%%.*%[([%l]*)")
40             if alsa.last.level ~= l or alsa.last.status ~= s then
41                 volume_now = { level = l, status = s }
42                 widget = alsa.widget
43                 settings()
44                 alsa.last = volume_now
45             end
46         end)
47     end
48
49     helpers.newtimer(string.format("alsa-%s-%s", alsa.cmd, alsa.channel), timeout, alsa.update)
50
51     return alsa
52 end
53
54 return factory