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#222 #223: readd math.min to catch #158
[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 type         = type
23 local tonumber     = tonumber
24 local setmetatable = setmetatable
25
26 -- Battery infos
27 -- lain.widgets.bat
28
29 local function worker(args)
30     local bat       = {}
31     local args      = args or {}
32     local timeout   = args.timeout or 30
33     local batteries = args.batteries or (args.battery and {args.battery}) or {"BAT0"}
34     local ac        = args.ac or "AC0"
35     local notify    = args.notify or "on"
36     local settings  = args.settings or function() end
37
38     bat.widget = wibox.widget.textbox('')
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     for i = 1, #batteries do
66         bat_now.n_status[i] = "N/A"
67     end
68
69     function update()
70         local sum_rate_current      = 0
71         local sum_rate_voltage      = 0
72         local sum_rate_power        = 0
73         local sum_rate_energy       = 0
74         local sum_energy_now        = 0
75         local sum_energy_full       = 0
76         local sum_energy_percentage = 0
77         local pspath                = "/sys/class/power_supply/"
78
79         for i, battery in ipairs(batteries) do
80             local bstr    = pspath .. battery
81             local present = first_line(bstr .. "/present")
82
83             if tonumber(present) == 1 then
84                 -- current_now(I)[uA], voltage_now(U)[uV], power_now(P)[uW]
85                 local rate_current      = tonumber(first_line(bstr .. "/current_now"))
86                 local rate_voltage      = tonumber(first_line(bstr .. "/voltage_now"))
87                 local rate_power        = tonumber(first_line(bstr .. "/power_now"))
88
89                 -- energy_now(P)[uWh], charge_now(I)[uAh]
90                 local energy_now        = tonumber(first_line(bstr .. "/energy_now") or
91                                           first_line(bstr .. "/charge_now"))
92
93                 -- energy_full(P)[uWh], charge_full(I)[uAh]
94                 local energy_full       = tonumber(first_line(bstr .. "/energy_full") or
95                                           first_line(bstr .. "/charge_full"))
96
97                 local energy_percentage = tonumber(first_line(bstr .. "/capacity")) or
98                                           math.floor((energy_now / energy_full) * 100)
99
100                 bat_now.n_status[i] = first_line(bstr .. "/status") or "N/A"
101
102                 sum_rate_current      = sum_rate_current + (rate_current or 0)
103                 sum_rate_voltage      = sum_rate_voltage + (rate_voltage or 0)
104                 sum_rate_power        = sum_rate_power + (rate_power or 0)
105                 sum_rate_energy       = sum_rate_energy + (rate_power or (((rate_voltage or 0) * (rate_current or 0)) / 1e6))
106                 sum_energy_now        = sum_energy_now + (energy_now or 0)
107                 sum_energy_full       = sum_energy_full + (energy_full or 0)
108                 sum_energy_percentage = sum_energy_percentage + (energy_percentage or 0)
109             end
110         end
111
112         bat_now.status = bat_now.n_status[1]
113         bat_now.ac_status = tonumber(first_line(string.format("%s%s/online", pspath, ac))) or "N/A"
114
115         if bat_now.status ~= "N/A" then
116             -- update {perc,time,watt} iff battery not full and rate > 0
117             if bat_now.status ~= "Full" and (sum_rate_power > 0 or sum_rate_current > 0) then
118                 local rate_time = 0
119                 local div = (sum_rate_power > 0 and sum_rate_power) or sum_rate_current
120
121                 if bat_now.status == "Charging" then
122                     rate_time = (sum_energy_full - sum_energy_now) / div
123                 else -- Discharging
124                     rate_time = sum_energy_now / div
125                 end
126
127                 if rate_time < 0.01 then -- check for magnitude discrepancies (#199)
128                     rate_time_magnitude = math.abs(math.floor(math.log10(rate_time)))
129                     rate_time = rate_time * 10^(rate_time_magnitude - 2)
130                 end
131
132                 local hours     = math.floor(rate_time)
133                 local minutes   = math.floor((rate_time - hours) * 60)
134                 bat_now.perc    = math.floor(math.min(100, (sum_energy_now / sum_energy_full) * 100))
135                 bat_now.time    = string.format("%02d:%02d", hours, minutes)
136                 bat_now.watt    = tonumber(string.format("%.2f", sum_rate_energy / 1e6))
137             elseif bat_now.status == "Full" then
138                 bat_now.perc    = 100
139                 bat_now.time    = "00:00"
140                 bat_now.watt    = 0
141             end
142         end
143
144         widget = bat.widget
145         settings()
146
147         -- notifications for low and critical states
148         if notify == "on" and type(bat_now.perc) == "number" and bat_now.status == "Discharging" then
149             if bat_now.perc <= 5 then
150                 bat.id = naughty.notify({
151                     preset = bat_notification_critical_preset,
152                     replaces_id = bat.id
153                 }).id
154             elseif bat_now.perc <= 15 then
155                 bat.id = naughty.notify({
156                     preset = bat_notification_low_preset,
157                     replaces_id = bat.id
158                 }).id
159             end
160         end
161     end
162
163     newtimer(battery, timeout, update)
164
165     return setmetatable(bat, { __index = bat.widget })
166 end
167
168 return setmetatable({}, { __call = function(_, ...) return worker(...) end })