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92d1833f5aed83c32b4487b29dbdbbe37acaa28f
[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     bat_now = {
53         status    = "N/A",
54         ac_status = "N/A",
55         perc      = "N/A",
56         time      = "N/A",
57         watt      = "N/A"
58     }
59
60     bat_now.n_status = {}
61     for i = 1, #batteries do
62         bat_now.n_status[i] = "N/A"
63     end
64
65     function update()
66         local sum_rate_current = 0
67         local sum_rate_voltage = 0
68         local sum_rate_power = 0
69         local sum_energy_now = 0
70         local sum_energy_full = 0
71         local sum_energy_percentage = 0
72
73         for i, battery in ipairs(batteries) do
74             local bstr    = "/sys/class/power_supply/" .. battery
75             local present = first_line(bstr .. "/present")
76
77             if present == "1"
78             then
79                 -- current_now(I)[uA], voltage_now(U)[uV], power_now(P)[uW]
80                 local rate_current      = tonumber(first_line(bstr .. "/current_now"))
81                 local rate_voltage      = tonumber(first_line(bstr .. "/voltage_now"))
82                 local rate_power        = tonumber(first_line(bstr .. "/power_now"))
83
84                 -- energy_now(P)[uWh], charge_now(I)[uAh]
85                 local energy_now        = tonumber(first_line(bstr .. "/energy_now") or
86                                           first_line(bstr .. "/charge_now"))
87
88                 -- energy_full(P)[uWh], charge_full(I)[uAh]
89                 local energy_full       = tonumber(first_line(bstr .. "/energy_full") or
90                                           first_line(bstr .. "/charge_full"))
91
92                 local energy_percentage = tonumber(first_line(bstr .. "/capacity")) or
93                                           math.floor((energy_now / energy_full) * 100)
94
95                 bat_now.n_status[i] = first_line(bstr .. "/status") or "N/A"
96
97                 sum_rate_current      = sum_rate_current + (rate_current or 0)
98                 sum_rate_voltage      = sum_rate_voltage + rate_voltage
99                 sum_rate_power        = sum_rate_power + (rate_power or ((rate_voltage * rate_current) / 1e6))
100                 sum_energy_now        = sum_energy_now + energy_now
101                 sum_energy_full       = sum_energy_full + energy_full
102                 sum_energy_percentage = sum_energy_percentage + energy_percentage
103             end
104         end
105
106         bat_now.status = bat_now.n_status[1]
107         bat_now.ac_status = tonumber(first_line(string.format("/sys/class/power_supply/%s/online", ac))) or "N/A"
108
109         if bat_now.status ~= "N/A" then
110             -- update {perc,time,watt} iff battery not full and rate > 0
111             if bat_now.status ~= "Full" and (sum_rate_current > 0 or sum_rate_power > 0) then
112                 local rate_time = 0
113
114                 if bat_now.status == "Charging" then
115                     rate_time = (sum_energy_full - sum_energy_now) / (sum_rate_power or sum_rate_current)
116                 elseif bat_now.status == "Discharging" then
117                     rate_time = sum_energy_now / (sum_rate_power or sum_rate_current)
118                 end
119
120                 local hours   = math.floor(rate_time)
121                 local minutes = math.floor((rate_time - hours) * 60)
122                 local watt    = (sum_rate_power / 1e6)
123
124                 bat_now.perc  = tonumber(string.format("%d", math.min(100, sum_energy_percentage / #batteries)))
125                 bat_now.time  = string.format("%02d:%02d", hours, minutes)
126                 bat_now.watt  = tonumber(string.format("%.2f", watt))
127             -- consistency check
128             elseif bat_now.status == "Full" then
129                 bat_now.perc = 100
130             end
131         end
132
133         widget = bat.widget
134         settings()
135
136         -- notifications for low and critical states
137         if notify == "on" and bat_now.perc and bat_now.status == "Discharging" then
138             if bat_now.perc <= 5 then
139                 bat.id = naughty.notify({
140                     preset = bat_notification_critical_preset,
141                     replaces_id = bat.id
142                 }).id
143             elseif bat_now.perc <= 15 then
144                 bat.id = naughty.notify({
145                     preset = bat_notification_low_preset,
146                     replaces_id = bat.id
147                 }).id
148             end
149         end
150     end
151
152     newtimer(battery, timeout, update)
153
154     return setmetatable(bat, { __index = bat.widget })
155 end
156
157 return setmetatable({}, { __call = function(_, ...) return worker(...) end })