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Merge branch 'master' of http://github.com/copycat-killer/lain into fix/pulse-sink
[etc/awesome.git] / widget / bat.lua
1 --[[
2
3          Licensed under GNU General Public License v2
4           * (c) 2013,      Luke Bonham
5           * (c) 2010-2012, Peter Hofmann
6
7 --]]
8
9 local first_line = require("lain.helpers").first_line
10 local newtimer   = require("lain.helpers").newtimer
11 local naughty    = require("naughty")
12 local wibox      = require("wibox")
13 local math       = { abs    = math.abs,
14                      floor  = math.floor,
15                      log10  = math.log10,
16                      min    = math.min }
17 local string     = { format = string.format }
18 local ipairs     = ipairs
19 local tonumber   = tonumber
20
21 -- Battery infos
22 -- lain.widget.bat
23
24 local function factory(args)
25     local bat       = { widget = wibox.widget.textbox() }
26     local args      = args or {}
27     local timeout   = args.timeout or 30
28     local batteries = args.batteries or (args.battery and {args.battery}) or {"BAT0"}
29     local ac        = args.ac or "AC0"
30     local notify    = args.notify or "on"
31     local n_perc    = args.n_perc or { 5, 15 }
32     local settings  = args.settings or function() end
33
34     bat_notification_critical_preset = {
35         title   = "Battery exhausted",
36         text    = "Shutdown imminent",
37         timeout = 15,
38         fg      = "#000000",
39         bg      = "#FFFFFF"
40     }
41
42     bat_notification_low_preset = {
43         title   = "Battery low",
44         text    = "Plug the cable!",
45         timeout = 15,
46         fg      = "#202020",
47         bg      = "#CDCDCD"
48     }
49
50     bat_now = {
51         status    = "N/A",
52         ac_status = "N/A",
53         perc      = "N/A",
54         time      = "N/A",
55         watt      = "N/A"
56     }
57
58     bat_now.n_status = {}
59     bat_now.n_perc   = {}
60     for i = 1, #batteries do
61         bat_now.n_status[i] = "N/A"
62         bat_now.n_perc[i] = 0
63     end
64
65     function bat.update()
66         local sum_rate_current = 0
67         local sum_rate_voltage = 0
68         local sum_rate_power   = 0
69         local sum_rate_energy  = 0
70         local sum_energy_now   = 0
71         local sum_energy_full  = 0
72         local pspath           = "/sys/class/power_supply/"
73
74         for i, battery in ipairs(batteries) do
75             local bstr    = pspath .. battery
76             local present = first_line(bstr .. "/present")
77
78             if tonumber(present) == 1 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                 bat_now.n_perc[i]   = energy_percentage or bat_now.n_perc[i]
97
98                 sum_rate_current = sum_rate_current + (rate_current or 0)
99                 sum_rate_voltage = sum_rate_voltage + (rate_voltage or 0)
100                 sum_rate_power   = sum_rate_power + (rate_power or 0)
101                 sum_rate_energy  = sum_rate_energy + (rate_power or (((rate_voltage or 0) * (rate_current or 0)) / 1e6))
102                 sum_energy_now   = sum_energy_now + (energy_now or 0)
103                 sum_energy_full  = sum_energy_full + (energy_full or 0)
104             end
105         end
106
107         -- When one of the battery is charging, others' status are either
108         -- "Full", "Unknown" or "Charging". When the laptop is not plugged in,
109         -- one or more of the batteries may be full, but only one battery
110         -- discharging suffices to set global status to "Discharging".
111         bat_now.status = bat_now.n_status[1]
112         for _,status in ipairs(bat_now.n_status) do
113             if status == "Discharging" or status == "Charging" then
114                 bat_now.status = status
115             end
116         end
117         bat_now.ac_status = tonumber(first_line(string.format("%s%s/online", pspath, ac))) or "N/A"
118
119         if bat_now.status ~= "N/A" then
120             if bat_now.status ~= "Full" and sum_rate_power == 0 and bat_now.ac_status == 1 then
121                 bat_now.perc  = math.floor(math.min(100, (sum_energy_now / sum_energy_full) * 100))
122                 bat_now.time  = "00:00"
123                 bat_now.watt  = 0
124
125             -- update {perc,time,watt} iff battery not full and rate > 0
126             elseif bat_now.status ~= "Full" then
127                 local rate_time = 0
128                 -- Calculate time and watt if rates are greater then 0
129                 if (sum_rate_power > 0 or sum_rate_current > 0) then
130                     local div = (sum_rate_power > 0 and sum_rate_power) or sum_rate_current
131
132                     if bat_now.status == "Charging" then
133                         rate_time = (sum_energy_full - sum_energy_now) / div
134                     else -- Discharging
135                         rate_time = sum_energy_now / div
136                     end
137
138                     if 0 < rate_time and rate_time < 0.01 then -- check for magnitude discrepancies (#199)
139                         rate_time_magnitude = math.abs(math.floor(math.log10(rate_time)))
140                         rate_time = rate_time * 10^(rate_time_magnitude - 2)
141                     end
142                  end
143
144                 local hours   = math.floor(rate_time)
145                 local minutes = math.floor((rate_time - hours) * 60)
146                 bat_now.perc  = math.floor(math.min(100, (sum_energy_now / sum_energy_full) * 100))
147                 bat_now.time  = string.format("%02d:%02d", hours, minutes)
148                 bat_now.watt  = tonumber(string.format("%.2f", sum_rate_energy / 1e6))
149             elseif bat_now.status == "Full" then
150                 bat_now.perc  = 100
151                 bat_now.time  = "00:00"
152                 bat_now.watt  = 0
153             end
154         end
155
156         widget = bat.widget
157         settings()
158
159         -- notifications for critical and low levels
160         if notify == "on" and bat_now.status == "Discharging" then
161             if tonumber(bat_now.perc) <= n_perc[1] then
162                 bat.id = naughty.notify({
163                     preset = bat_notification_critical_preset,
164                     replaces_id = bat.id
165                 }).id
166             elseif tonumber(bat_now.perc) <= n_perc[2] then
167                 bat.id = naughty.notify({
168                     preset = bat_notification_low_preset,
169                     replaces_id = bat.id
170                 }).id
171             end
172         end
173     end
174
175     newtimer("batteries", timeout, bat.update)
176
177     return bat
178 end
179
180 return factory