contrib/statusd/legacy/statusd_volume2.lua

   1 -- Authors: Randall Wald <randy@rwald.com>
   2 -- License: GPL, version 2
   3 -- Last Changed: Unknown
   4 --
   5 -- statusd_volume2.lua
   6 -- Volume level and state information script
   7 -- Written by Randall Wald
   8 -- email: randy@rwald.com
   9 -- Released under the GPL
  10 --
  11 -- Based on a public domain script written by Benjamin Sigonneau
  12 --
  13 -- This script uses "amixer" to find volume information. If you don't have
  14 -- "amixer," this script will fail. Sorry.
  15 -- Though this is labeled "statusd_volume2.lua", rename it to
  16 -- "statusd_volume.lua" to make it work.
  17 --
  18 -- Available monitors:
  19 --      %volume_level   Volume level, as a percentage from 0% to 100%
  20 --      %volume_state   The string "" if unmuted, "MUTE " if muted
  21 --
  22 -- Example use:
  23 --      template="[ %date || <other stuff> || vol: %volume_level %volume state]"
  24 --      (note space between monitors but lack of space after %volume_state)
  25 -- This will print
  26 --      [ <Date> || <other stuff> || vol: 54% ]
  27 -- when unmuted but
  28 --      [ <Date> || <other stuff> || vol: 54% MUTE ]
  29 -- when muted.
  30
  31 local function get_volume()
  32    local f=io.popen('amixer','r')
  33    local s=f:read('*all')
  34    f:close()
  35    local _, _, master_level, master_state = string.find(s, "%[(%d*%%)%] %[(%a*)%]")
  36    local sound_state = ""
  37    if master_state == "off" then
  38       sound_state = "MUTE "
  39    end
  40   return master_level.."", sound_state..""
  41 end
  42
  43 local function inform_volume(name, value)
  44    if statusd ~= nil then
  45       statusd.inform(name, value)
  46    else
  47       io.stdout:write(name..": "..value.."\n")
  48    end
  49 end
  50 local function inform_state(value)
  51    if statusd ~= nil then
  52       statusd.inform("volume_state", value)
  53    else
  54       io.stdout:write("volume_state"..value.."\n")
  55    end
  56 end
  57
  58 if statusd ~= nil then
  59    volume_timer = statusd.create_timer()
  60 end
  61
  62 local function update_volume()
  63    local master_level, sound_state = get_volume()
  64    inform_volume("volume_level", master_level)
  65    inform_volume("volume_state", sound_state)
  66    if statusd ~= nil then
  67       volume_timer:set(500, update_volume)
  68    end
  69 end
  70
  71 update_volume()