contrib/statusd/legacy/statusd_linuxbatt.lua

   1 -- Authors: Unknown
   2 -- License: Public domain
   3 -- Last Changed: Unknown
   4 --
   5 -- statusd_linuxbatt.lua
   6 --
   7 -- Public domain
   8 --
   9 -- Uses the /proc/acpi interface to get battery percentage.
  10 --
  11 -- Use the key "linuxbatt" to get the battery percentage; use
  12 -- "linuxbatt_state" to get a symbol indicating charging "+",
  13 -- discharging "-", or charged " ".
  14 --
  15 -- Now uses lua functions instead of bash, awk, dc.  MUCH faster!
  16 --
  17 -- The "bat" option to the statusd settings for linuxbatt modifies which
  18 -- battery we look at.
  19
  20 local defaults={
  21         update_interval=15*1000,
  22         bat=0,
  23         important_threshold=30,
  24         critical_threshold=10,
  25 }
  26 local settings=table.join(statusd.get_config("linuxbatt"), defaults)
  27
  28 function linuxbatt_do_find_capacity()
  29         local f=io.open('/proc/acpi/battery/BAT'.. settings.bat ..'/info')
  30         local infofile=f:read('*a')
  31         f:close()
  32         local i, j, capacity = string.find(infofile, 'last full capacity:%s*(%d+) .*')
  33         return capacity
  34 end
  35
  36 local capacity = linuxbatt_do_find_capacity()
  37
  38 function get_linuxbatt()
  39
  40         local f=io.open('/proc/acpi/battery/BAT'.. settings.bat ..'/state')
  41         local statefile=f:read('*a')
  42         f:close()
  43         local i, j, remaining = string.find(statefile, 'remaining capacity:%s*(%d+) .*')
  44         local percent = math.floor( remaining * 100 / capacity )
  45
  46         local i, j, statename = string.find(statefile, 'charging state:%s*(%a+).*')
  47         if statename == "charging" then
  48                 return percent, "+"
  49         elseif statename == "discharging" then
  50                 return percent, "-"
  51         else
  52                 return percent, " "
  53         end
  54 end
  55
  56 function update_linuxbatt()
  57         local perc, state = get_linuxbatt()
  58         statusd.inform("linuxbatt", tostring(perc))
  59         statusd.inform("linuxbatt_state", state)
  60         if perc < settings.critical_threshold
  61         then statusd.inform("linuxbatt_hint", "critical")
  62         elseif perc < settings.important_threshold
  63         then statusd.inform("linuxbatt_hint", "important")
  64         else statusd.inform("linuxbatt_hint", "normal")
  65         end
  66         linuxbatt_timer:set(settings.update_interval, update_linuxbatt)
  67 end
  68
  69 linuxbatt_timer = statusd.create_timer()
  70 update_linuxbatt()