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[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 first_line   = require("lain.helpers").first_line
11 local make_widget  = require("lain.helpers").make_widget_textbox
12 local newtimer     = require("lain.helpers").newtimer
13
14 local naughty      = require("naughty")
15 local wibox        = require("wibox")
16
17 local math         = { abs    = math.abs,
18                        floor  = math.floor,
19                        log10  = math.log10,
20                        min    = math.min }
21 local string       = { format = string.format }
22
23 local ipairs       = ipairs
24 local type         = type
25 local tonumber     = tonumber
26 local setmetatable = setmetatable
27
28 -- Battery infos
29 -- lain.widgets.bat
30
31 local function worker(args)
32     local bat       = make_widget()
33     local args      = args or {}
34     local timeout   = args.timeout or 30
35     local batteries = args.batteries or (args.battery and {args.battery}) or {"BAT0"}
36     local ac        = args.ac or "AC0"
37     local notify    = args.notify or "on"
38     local settings  = args.settings or function() end
39
40     bat_notification_low_preset = {
41         title   = "Battery low",
42         text    = "Plug the cable!",
43         timeout = 15,
44         fg      = "#202020",
45         bg      = "#CDCDCD"
46     }
47
48     bat_notification_critical_preset = {
49         title   = "Battery exhausted",
50         text    = "Shutdown imminent",
51         timeout = 15,
52         fg      = "#000000",
53         bg      = "#FFFFFF"
54     }
55
56     bat_now = {
57         status    = "N/A",
58         ac_status = "N/A",
59         perc      = "N/A",
60         time      = "N/A",
61         watt      = "N/A"
62     }
63
64     bat_now.n_status = {}
65     bat_now.n_perc   = {}
66     for i = 1, #batteries do
67         bat_now.n_status[i] = "N/A"
68         bat_now.n_perc[i] = 0
69     end
70
71     function bat.update()
72         local sum_rate_current = 0
73         local sum_rate_voltage = 0
74         local sum_rate_power   = 0
75         local sum_rate_energy  = 0
76         local sum_energy_now   = 0
77         local sum_energy_full  = 0
78         local pspath           = "/sys/class/power_supply/"
79
80         for i, battery in ipairs(batteries) do
81             local bstr    = pspath .. battery
82             local present = first_line(bstr .. "/present")
83
84             if tonumber(present) == 1 then
85                 -- current_now(I)[uA], voltage_now(U)[uV], power_now(P)[uW]
86                 local rate_current = tonumber(first_line(bstr .. "/current_now"))
87                 local rate_voltage = tonumber(first_line(bstr .. "/voltage_now"))
88                 local rate_power   = tonumber(first_line(bstr .. "/power_now"))
89
90                 -- energy_now(P)[uWh], charge_now(I)[uAh]
91                 local energy_now        = tonumber(first_line(bstr .. "/energy_now") or
92                                           first_line(bstr .. "/charge_now"))
93
94                 -- energy_full(P)[uWh], charge_full(I)[uAh]
95                 local energy_full       = tonumber(first_line(bstr .. "/energy_full") or
96                                           first_line(bstr .. "/charge_full"))
97
98                 local energy_percentage = tonumber(first_line(bstr .. "/capacity")) or
99                                           math.floor((energy_now / energy_full) * 100)
100
101                 bat_now.n_status[i] = first_line(bstr .. "/status") or "N/A"
102                 bat_now.n_perc[i]   = energy_percentage or bat_now.n_perc[i]
103
104                 sum_rate_current = sum_rate_current + (rate_current or 0)
105                 sum_rate_voltage = sum_rate_voltage + (rate_voltage or 0)
106                 sum_rate_power   = sum_rate_power + (rate_power or 0)
107                 sum_rate_energy  = sum_rate_energy + (rate_power or (((rate_voltage or 0) * (rate_current or 0)) / 1e6))
108                 sum_energy_now   = sum_energy_now + (energy_now or 0)
109                 sum_energy_full  = sum_energy_full + (energy_full or 0)
110             end
111         end
112
113         -- When one of the battery is charging, others' status are either
114         -- "Full", "Unknown" or "Charging". When the laptop is not plugged in,
115         -- one or more of the batteries may be full, but only one battery
116         -- discharging suffices to set global status to "Discharging".
117         bat_now.status = bat_now.n_status[1]
118         for _,status in ipairs(bat_now.n_status) do
119             if status == "Discharging" or status == "Charging" then
120                 bat_now.status = status
121             end
122         end
123         bat_now.ac_status = tonumber(first_line(string.format("%s%s/online", pspath, ac))) or "N/A"
124
125         if bat_now.status ~= "N/A" then
126             -- update {perc,time,watt} iff battery not full and rate > 0
127             if bat_now.status ~= "Full" and (sum_rate_power > 0 or sum_rate_current > 0) then
128                 local rate_time = 0
129                 local div = (sum_rate_power > 0 and sum_rate_power) or sum_rate_current
130
131                 if bat_now.status == "Charging" then
132                     rate_time = (sum_energy_full - sum_energy_now) / div
133                 else -- Discharging
134                     rate_time = sum_energy_now / div
135                 end
136
137                 if 0 < rate_time and rate_time < 0.01 then -- check for magnitude discrepancies (#199)
138                     rate_time_magnitude = math.abs(math.floor(math.log10(rate_time)))
139                     rate_time = rate_time * 10^(rate_time_magnitude - 2)
140                 end
141
142                 local hours   = math.floor(rate_time)
143                 local minutes = math.floor((rate_time - hours) * 60)
144                 bat_now.perc  = math.floor(math.min(100, (sum_energy_now / sum_energy_full) * 100))
145                 bat_now.time  = string.format("%02d:%02d", hours, minutes)
146                 bat_now.watt  = tonumber(string.format("%.2f", sum_rate_energy / 1e6))
147             elseif bat_now.status ~= "Full" and sum_rate_power == 0 and bat_now.ac_status == 1 then
148                                                                 bat_now.perc  = math.floor(math.min(100, (sum_energy_now / sum_energy_full) * 100))
149                                                                 bat_now.time  = "00:00"
150                                                                 bat_now.watt  = 0
151             elseif bat_now.status == "Full" then
152                 bat_now.perc  = 100
153                 bat_now.time  = "00:00"
154                 bat_now.watt  = 0
155             end
156         end
157
158         widget = bat.widget
159         settings()
160
161         -- notifications for low and critical states
162         if notify == "on" and type(bat_now.perc) == "number" and bat_now.status == "Discharging" then
163             if bat_now.perc <= 5 then
164                 bat.id = naughty.notify({
165                     preset = bat_notification_critical_preset,
166                     replaces_id = bat.id
167                 }).id
168             elseif bat_now.perc <= 15 then
169                 bat.id = naughty.notify({
170                     preset = bat_notification_low_preset,
171                     replaces_id = bat.id
172                 }).id
173             end
174         end
175     end
176
177     newtimer(battery, timeout, bat.update)
178
179     return bat
180 end
181
182 return setmetatable({}, { __call = function(_, ...) return worker(...) end })