archlinux_conf/etc/ion3/old/statusd_linuxbatt.lua

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