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 local tonumber     = tonumber
  19
  20 local setmetatable = setmetatable
  21
  22 -- Battery infos
  23 -- lain.widgets.bat
  24
  25 local function worker(args)
  26         local bat      = {}
  27         local args     = args or {}
  28         local timeout  = args.timeout or 30
  29         local battery  = args.battery or "BAT0"
  30         local ac       = args.ac or "AC0"
  31         local notify   = args.notify or "on"
  32         local settings = args.settings or function() end
  33
  34         bat.widget = wibox.widget.textbox('')
  35
  36         bat_notification_low_preset = {
  37                 title = "Battery low",
  38                 text = "Plug the cable!",
  39                 timeout = 15,
  40                 fg = "#202020",
  41                 bg = "#CDCDCD"
  42         }
  43
  44         bat_notification_critical_preset = {
  45                 title = "Battery exhausted",
  46                 text = "Shutdown imminent",
  47                 timeout = 15,
  48                 fg = "#000000",
  49                 bg = "#FFFFFF"
  50         }
  51
  52         function update()
  53                 bat_now = {
  54                         status    = "Not present",
  55                         ac_status = "N/A",
  56                         perc      = "N/A",
  57                         time      = "N/A",
  58                         watt      = "N/A"
  59                 }
  60
  61                 local bstr    = "/sys/class/power_supply/" .. battery
  62                 local astr    = "/sys/class/power_supply/" .. ac
  63                 local present = first_line(bstr .. "/present")
  64
  65                 if present == "1"
  66                 then
  67                         -- current_now(I)[uA], voltage_now(U)[uV], power_now(P)[uW]
  68                         local rate_current      = tonumber(first_line(bstr .. "/current_now"))
  69                         local rate_voltage      = tonumber(first_line(bstr .. "/voltage_now"))
  70                         local rate_power        = tonumber(first_line(bstr .. "/power_now"))
  71
  72                         -- energy_now(P)[uWh], charge_now(I)[uAh]
  73                         local energy_now        = tonumber(first_line(bstr .. "/energy_now") or
  74                                                                                 first_line(bstr .. "/charge_now"))
  75
  76                         -- energy_full(P)[uWh], charge_full(I)[uAh],
  77                         local energy_full       = tonumber(first_line(bstr .. "/energy_full") or
  78                                                                                 first_line(bstr .. "/charge_full"))
  79
  80
  81                         local energy_percentage = tonumber(first_line(bstr .. "/capacity")) or
  82                                                                                 math.floor((energy_now / energy_full) * 100)
  83
  84                         bat_now.status = first_line(bstr .. "/status") or "N/A"
  85                         bat_now.ac_status     = first_line(astr .. "/online") or "N/A"
  86
  87                         -- if rate = 0 or rate not defined skip the round
  88                         if      not (rate_power and rate_power > 0) and
  89                                 not (rate_current and  rate_current > 0) and
  90                                 not (bat_now.status == "Full")
  91                         then
  92                                 return
  93                         end
  94
  95                         local rate_time = 0
  96                         if bat_now.status == "Charging"
  97                         then
  98                                 rate_time = (energy_full - energy_now) / rate_power or rate_current
  99                         elseif bat_now.status == "Discharging"
 100                         then
 101                                 rate_time = energy_now / rate_power or rate_current
 102                         end
 103
 104                         local hours   = math.floor(rate_time)
 105                         local minutes = math.floor((rate_time - hours) * 60)
 106
 107                         bat_now.perc = string.format("%d", energy_percentage)
 108                         bat_now.time = string.format("%02d:%02d", hours, minutes)
 109                         bat_now.watt = string.format("%.2fW", rate_power / 1e6 or (rate_voltage * rate_current)  / 1e12)
 110
 111                 end
 112                 widget = bat.widget
 113                 settings()
 114
 115                 -- notifications for low and critical states
 116                 if bat_now.status == "Discharging" and notify == "on" and bat_now.perc
 117                 then
 118                         local nperc = tonumber(bat_now.perc) or 100
 119                         if nperc <= 5
 120                         then
 121                                 bat.id = naughty.notify({
 122                                         preset = bat_notification_critical_preset,
 123                                         replaces_id = bat.id,
 124                                 }).id
 125                         elseif nperc <= 15
 126                         then
 127                                 bat.id = naughty.notify({
 128                                         preset = bat_notification_low_preset,
 129                                         replaces_id = bat.id,
 130                                 }).id
 131                         end
 132                 end
 133         end
 134
 135         newtimer(battery, timeout, update)
 136
 137         return setmetatable(bat, { __index = bat.widget })
 138 end
 139
 140 return setmetatable({}, { __call = function(_, ...) return worker(...) end })