widgets/bat.lua

   1
   2 --[[
   3
   4      Licensed under GNU General Public License v2
   5       * (c) 2013,      Luke Bonham
   6       * (c) 2010-2012, Peter Hofmann
   7
   8 --]]
   9
  10 local newtimer     = require("lain.helpers").newtimer
  11 local first_line   = require("lain.helpers").first_line
  12
  13 local naughty      = require("naughty")
  14 local wibox        = require("wibox")
  15
  16 local math         = { floor  = math.floor }
  17 local string       = { format = string.format }
  18
  19 local setmetatable = setmetatable
  20
  21 -- Battery infos
  22 -- lain.widgets.bat
  23 local bat = {}
  24
  25 local function worker(args)
  26     local args = args or {}
  27     local timeout = args.timeout or 30
  28     local battery = args.battery or "BAT0"
  29     local settings = args.settings or function() end
  30
  31     bat.widget = wibox.widget.textbox('')
  32
  33     function update()
  34         bat_now = {
  35             status = "Not present",
  36             perc   = "N/A",
  37             time   = "N/A",
  38             watt   = "N/A"
  39         }
  40
  41         local present = first_line("/sys/class/power_supply/"
  42                                    .. battery
  43                                    .. "/present")
  44
  45         if present == "1"
  46         then
  47             local rate = first_line("/sys/class/power_supply/"
  48                                     .. battery ..
  49                                     "/power_now")
  50             local ratev = first_line("/sys/class/power_supply/"
  51                                     .. battery ..
  52                                      "/voltage_now")
  53             local rem = first_line("/sys/class/power_supply/"
  54                                     .. battery ..
  55                                    "/energy_now")
  56             local tot = first_line("/sys/class/power_supply/"
  57                                     .. battery ..
  58                                    "/energy_full")
  59             bat_now.status = first_line("/sys/class/power_supply/"
  60                                     .. battery ..
  61                                    "/status")
  62
  63             local time_rat = 0
  64             if bat_now.status == "Charging"
  65             then
  66                 time_rat = (tot - rem) / rate
  67             elseif bat_now.status == "Discharging"
  68             then
  69                 time_rat = rem / rate
  70             end
  71
  72             local hrs = math.floor(time_rat)
  73             local min = (time_rat - hrs) * 60
  74
  75             bat_now.time = string.format("%02d:%02d", hrs, min)
  76             bat_now.perc = (rem / tot) * 100
  77             bat_now.watt = string.format("%.2fW", (rate * ratev) / 1e12)
  78
  79             -- notifications for low and critical states
  80             if bat_now.perc <= 5
  81             then
  82                 bat.id = naughty.notify({
  83                     text = "shutdown imminent",
  84                     title = "battery nearly exhausted",
  85                     position = "top_right",
  86                     timeout = 15,
  87                     fg="#000000",
  88                     bg="#ffffff",
  89                     ontop = true,
  90                     replaces_id = bat.id
  91                 }).id
  92             elseif bat_now.perc <= 15
  93             then
  94                 bat.id = naughty.notify({
  95                     text = "plug the cable",
  96                     title = "battery low",
  97                     position = "top_right",
  98                     timeout = 15,
  99                     fg="#202020",
 100                     bg="#cdcdcd",
 101                     ontop = true,
 102                     replaces_id = bat.id
 103                 }).id
 104             end
 105
 106             bat_now.perc = string.format("%d", bat_now.perc)
 107         end
 108
 109         widget = bat.widget
 110         settings()
 111     end
 112
 113     newtimer("bat", timeout, update)
 114
 115     return bat.widget
 116 end
 117
 118 return setmetatable(bat, { __call = function(_, ...) return worker(...) end })