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069fac8cb980b7e138b2a57783b65cd7755d1639
[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         = { abs    = math.abs,
17                        floor  = math.floor,
18                        log10  = math.log10,
19                        min    = math.min }
20 local string       = { format = string.format }
21
22 local tonumber     = tonumber
23 local setmetatable = setmetatable
24
25 -- Battery infos
26 -- lain.widgets.bat
27
28 local function worker(args)
29     local bat       = {}
30     local args      = args or {}
31     local timeout   = args.timeout or 30
32     local batteries = args.batteries or (args.battery and {args.battery}) or {"BAT0"}
33     local ac        = args.ac or "AC0"
34     local notify    = args.notify or "on"
35     local settings  = args.settings or function() end
36
37     bat.widget = wibox.widget.textbox('')
38
39     bat_notification_low_preset = {
40         title   = "Battery low",
41         text    = "Plug the cable!",
42         timeout = 15,
43         fg      = "#202020",
44         bg      = "#CDCDCD"
45     }
46
47     bat_notification_critical_preset = {
48         title   = "Battery exhausted",
49         text    = "Shutdown imminent",
50         timeout = 15,
51         fg      = "#000000",
52         bg      = "#FFFFFF"
53     }
54
55     bat_now = {
56         status    = "N/A",
57         ac_status = "N/A",
58         perc      = "N/A",
59         time      = "N/A",
60         watt      = "N/A"
61     }
62
63     bat_now.n_status = {}
64     for i = 1, #batteries do
65         bat_now.n_status[i] = "N/A"
66     end
67
68     function update()
69         local sum_rate_current      = 0
70         local sum_rate_voltage      = 0
71         local sum_rate_power        = 0
72         local sum_energy_now        = 0
73         local sum_energy_full       = 0
74         local sum_energy_percentage = 0
75         local pspath                = "/sys/class/power_supply/"
76
77         for i, battery in ipairs(batteries) do
78             local bstr    = pspath .. battery
79             local present = first_line(bstr .. "/present")
80
81             if tonumber(present) == 1 then
82                 -- current_now(I)[uA], voltage_now(U)[uV], power_now(P)[uW]
83                 local rate_current      = tonumber(first_line(bstr .. "/current_now"))
84                 local rate_voltage      = tonumber(first_line(bstr .. "/voltage_now"))
85                 local rate_power        = tonumber(first_line(bstr .. "/power_now"))
86
87                 -- energy_now(P)[uWh], charge_now(I)[uAh]
88                 local energy_now        = tonumber(first_line(bstr .. "/energy_now") or
89                                           first_line(bstr .. "/charge_now"))
90
91                 -- energy_full(P)[uWh], charge_full(I)[uAh]
92                 local energy_full       = tonumber(first_line(bstr .. "/energy_full") or
93                                           first_line(bstr .. "/charge_full"))
94
95                 local energy_percentage = tonumber(first_line(bstr .. "/capacity")) or
96                                           math.floor((energy_now / energy_full) * 100)
97
98                 bat_now.n_status[i] = first_line(bstr .. "/status") or "N/A"
99
100                 sum_rate_current      = sum_rate_current + (rate_current or 0)
101                 sum_rate_voltage      = sum_rate_voltage + rate_voltage
102                 sum_rate_power        = sum_rate_power + (rate_power or ((rate_voltage * rate_current) / 1e6))
103                 sum_energy_now        = sum_energy_now + (energy_now or 0)
104                 sum_energy_full       = sum_energy_full + energy_full
105                 sum_energy_percentage = sum_energy_percentage + energy_percentage
106             end
107         end
108
109         bat_now.status = bat_now.n_status[1]
110         bat_now.ac_status = tonumber(first_line(string.format("%s%s/online", pspath, ac))) or "N/A"
111
112         if bat_now.status ~= "N/A" then
113             -- update {perc,time,watt} iff battery not full and rate > 0
114             if bat_now.status ~= "Full" and (sum_rate_current > 0 or sum_rate_power > 0) then
115                 local rate_time = 0
116
117                 if bat_now.status == "Charging" then
118                     rate_time = (sum_energy_full - sum_energy_now) / (sum_rate_power or sum_rate_current)
119                 else -- Discharging
120                     rate_time = sum_energy_now / (sum_rate_power or sum_rate_current)
121                 end
122
123                 if rate_time < 0.01 then -- check for magnitude discrepancies
124                     rate_time_magnitude = math.abs(math.floor(math.log10(rate_time)))
125                     rate_time = rate_time * 10^(rate_time_magnitude - 2)
126                 end
127
128                 local hours     = math.floor(rate_time)
129                 local minutes   = math.floor((rate_time - hours) * 60)
130                 bat_now.perc    = tonumber(string.format("%d", math.min(100, sum_energy_percentage / #batteries)))
131                 bat_now.time    = string.format("%02d:%02d", hours, minutes)
132                 bat_now.watt    = tonumber(string.format("%.2f", sum_rate_power / 1e6))
133             elseif bat_now.status == "Full" then
134                 bat_now.perc    = 100
135                 bat_now.time    = "00:00"
136                 bat_now.watt    = 0
137             end
138         end
139
140         widget = bat.widget
141         settings()
142
143         -- notifications for low and critical states
144         if notify == "on" and bat_now.perc and bat_now.status == "Discharging" then
145             if bat_now.perc <= 5 then
146                 bat.id = naughty.notify({
147                     preset = bat_notification_critical_preset,
148                     replaces_id = bat.id
149                 }).id
150             elseif bat_now.perc <= 15 then
151                 bat.id = naughty.notify({
152                     preset = bat_notification_low_preset,
153                     replaces_id = bat.id
154                 }).id
155             end
156         end
157     end
158
159     newtimer(battery, timeout, update)
160
161     return setmetatable(bat, { __index = bat.widget })
162 end
163
164 return setmetatable({}, { __call = function(_, ...) return worker(...) end })