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e1bc5d1133839104653b53494da8e9f0ec0b645c
[etc/awesome.git] / 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, min = math.min }
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 batteries = args.batteries or (args.battery and {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 sum_rate_current = 0
62         local sum_rate_voltage = 0
63         local sum_rate_power = 0
64         local sum_energy_now = 0
65         local sum_energy_full = 0
66         local sum_energy_percentage = 0
67
68         for i, battery in ipairs(batteries) do
69             local bstr    = "/sys/class/power_supply/" .. battery
70             local present = first_line(bstr .. "/present")
71
72             if present == "1"
73             then
74                 -- current_now(I)[uA], voltage_now(U)[uV], power_now(P)[uW]
75                 local rate_current      = tonumber(first_line(bstr .. "/current_now"))
76                 local rate_voltage      = tonumber(first_line(bstr .. "/voltage_now"))
77                 local rate_power        = tonumber(first_line(bstr .. "/power_now"))
78
79                 -- energy_now(P)[uWh], charge_now(I)[uAh]
80                 local energy_now        = tonumber(first_line(bstr .. "/energy_now") or
81                                           first_line(bstr .. "/charge_now"))
82
83                 -- energy_full(P)[uWh], charge_full(I)[uAh]
84                 local energy_full       = tonumber(first_line(bstr .. "/energy_full") or
85                                           first_line(bstr .. "/charge_full"))
86
87                 local energy_percentage = tonumber(first_line(bstr .. "/capacity")) or
88                                           math.floor((energy_now / energy_full) * 100)
89
90                 if bat_now.status ~= "Charging" and bat_now.status ~= "Discharging"
91                 then
92                     bat_now.status = first_line(bstr .. "/status") or "N/A"
93                 end
94
95                 sum_rate_current = sum_rate_current + (rate_current or 0)
96                 sum_rate_voltage = sum_rate_voltage + rate_voltage
97                 sum_rate_power = sum_rate_power + (rate_power or ((rate_voltage * rate_current) / 1e6))
98                 sum_energy_now = sum_energy_now + energy_now
99                 sum_energy_full = sum_energy_full + energy_full
100                 sum_energy_percentage = sum_energy_percentage + energy_percentage
101             end
102         end
103
104         local astr    = "/sys/class/power_supply/" .. ac
105         bat_now.ac_status = first_line(astr .. "/online") or "N/A"
106
107         -- update {perc,time,watt} iff rate > 0 and battery not full
108         if ((sum_rate_current > 0) or (sum_rate_power > 0))
109             and bat_now.status ~= "N/A" and bat_now.status ~= "Full"
110         then
111             local rate_time = 0
112             if bat_now.status == "Charging" then
113                 rate_time = (sum_energy_full - sum_energy_now) / (sum_rate_power or sum_rate_current)
114             elseif bat_now.status == "Discharging" then
115                 rate_time = sum_energy_now / (sum_rate_power or sum_rate_current)
116             end
117
118             local hours   = math.floor(rate_time)
119             local minutes = math.floor((rate_time - hours) * 60)
120             local watt    = sum_rate_power / 1e6
121             bat_now.perc  = string.format("%d", math.min(100, sum_energy_percentage / table.getn(batteries)))
122             bat_now.time  = string.format("%02d:%02d", hours, minutes)
123             bat_now.watt  = string.format("%.2fW", watt)
124         end
125
126         widget = bat.widget
127         settings()
128
129         -- notifications for low and critical states
130         if bat_now.status == "Discharging" and notify == "on" and bat_now.perc then
131             local nperc = tonumber(bat_now.perc) or 100
132             if nperc <= 5 then
133                 bat.id = naughty.notify({
134                     preset = bat_notification_critical_preset,
135                     replaces_id = bat.id,
136                 }).id
137             elseif nperc <= 15 then
138                 bat.id = naughty.notify({
139                     preset = bat_notification_low_preset,
140                     replaces_id = bat.id,
141                 }).id
142             end
143         end
144     end
145
146     newtimer(battery, timeout, update)
147
148     return setmetatable(bat, { __index = bat.widget })
149 end
150
151 return setmetatable({}, { __call = function(_, ...) return worker(...) end })