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43b7a5f22102fd0cc54bd0ce2bde021586fc415b
[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 battery  = 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     function update()
53         bat_now = {
54             status    = "Not present",
55             ac_status = "N/A",
56             perc      = "N/A",
57             time      = "N/A",
58             watt      = "N/A"
59         }
60
61         local bstr    = "/sys/class/power_supply/" .. battery
62         local astr    = "/sys/class/power_supply/" .. ac
63         local present = first_line(bstr .. "/present")
64
65         if present == "1"
66         then
67             -- current_now(I)[uA], voltage_now(U)[uV], power_now(P)[uW]
68             local rate_current      = tonumber(first_line(bstr .. "/current_now"))
69             local rate_voltage      = tonumber(first_line(bstr .. "/voltage_now"))
70             local rate_power        = tonumber(first_line(bstr .. "/power_now"))
71
72             -- energy_now(P)[uWh], charge_now(I)[uAh]
73             local energy_now        = tonumber(first_line(bstr .. "/energy_now") or
74                                       first_line(bstr .. "/charge_now"))
75
76             -- energy_full(P)[uWh], charge_full(I)[uAh]
77             local energy_full       = tonumber(first_line(bstr .. "/energy_full") or
78                                       first_line(bstr .. "/charge_full"))
79
80             local energy_percentage = tonumber(first_line(bstr .. "/capacity")) or
81                                       math.floor((energy_now / energy_full) * 100)
82
83             bat_now.status    = first_line(bstr .. "/status") or "N/A"
84             bat_now.ac_status = first_line(astr .. "/online") or "N/A"
85
86             -- update {perc,time,watt} iff rate > 0 and battery not full
87             if ((rate_current and rate_current > 0) or (rate_power and rate_power > 0))
88                 and bat_now.status ~= "N/A" and bat_now.status ~= "Full"
89             then
90                 local rate_time = 0
91                 if bat_now.status == "Charging" then
92                     rate_time = (energy_full - energy_now) / (rate_power or rate_current)
93                 elseif bat_now.status == "Discharging" then
94                     rate_time = energy_now / (rate_power or rate_current)
95                 end
96
97                 local hours   = math.floor(rate_time)
98                 local minutes = math.floor((rate_time - hours) * 60)
99                 local watt    = rate_power and (rate_power / 1e6) or (rate_voltage * rate_current) / 1e12
100
101                 bat_now.perc = string.format("%d", math.min(100, energy_percentage))
102                 bat_now.time = string.format("%02d:%02d", hours, minutes)
103                 bat_now.watt = string.format("%.2fW", watt)
104             end
105         end
106
107         widget = bat.widget
108         settings()
109
110         -- notifications for low and critical states
111         if bat_now.status == "Discharging" and notify == "on" and bat_now.perc then
112             local nperc = tonumber(bat_now.perc) or 100
113             if nperc <= 5 then
114                 bat.id = naughty.notify({
115                     preset = bat_notification_critical_preset,
116                     replaces_id = bat.id,
117                 }).id
118             elseif nperc <= 15 then
119                 bat.id = naughty.notify({
120                     preset = bat_notification_low_preset,
121                     replaces_id = bat.id,
122                 }).id
123             end
124         end
125     end
126
127     newtimer(battery, timeout, update)
128
129     return setmetatable(bat, { __index = bat.widget })
130 end
131
132 return setmetatable({}, { __call = function(_, ...) return worker(...) end })