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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 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 }
17 local string       = { format = string.format }
18 local tonumber     = tonumber
19
20 local setmetatable = setmetatable
21
22 -- Battery infos
23 -- lain.widgets.bat
24 local bat = {}
25
26 local function worker(args)
27     local args = args or {}
28     local timeout = args.timeout or 30
29     local battery = args.battery or "BAT0"
30     local notify = args.notify or "on"
31     local settings = args.settings or function() end
32
33     bat.widget = wibox.widget.textbox('')
34
35     bat_notification_low_preset = {
36         title = "Battery low",
37         text = "Plug the cable!",
38         timeout = 15,
39         fg = "#202020",
40         bg = "#CDCDCD"
41     }
42
43     bat_notification_critical_preset = {
44         title = "Battery exhausted",
45         text = "Shutdown imminent",
46         timeout = 15,
47         fg = "#000000",
48         bg = "#FFFFFF"
49     }
50
51     function update()
52         bat_now = {
53             status = "Not present",
54             perc   = "N/A",
55             time   = "N/A",
56             watt   = "N/A"
57         }
58
59         local bstr  = "/sys/class/power_supply/" .. battery
60
61         local present = first_line(bstr .. "/present")
62
63         if present == "1"
64         then
65             local rate  = first_line(bstr .. "/power_now") or
66                           first_line(bstr .. "/current_now")
67
68             local ratev = first_line(bstr .. "/voltage_now")
69
70             local rem   = first_line(bstr .. "/energy_now") or
71                           first_line(bstr .. "/charge_now")
72
73             local tot   = first_line(bstr .. "/energy_full") or
74                           first_line(bstr .. "/charge_full")
75
76             bat_now.status = first_line(bstr .. "/status") or "N/A"
77
78             rate  = tonumber(rate) or 1
79             ratev = tonumber(ratev)
80             rem   = tonumber(rem)
81             tot   = tonumber(tot)
82
83             local time_rat = 0
84             if bat_now.status == "Charging"
85             then
86                 time_rat = (tot - rem) / rate
87             elseif bat_now.status == "Discharging"
88             then
89                 time_rat = rem / rate
90             end
91
92             local hrs = math.floor(time_rat)
93             if hrs < 0 then hrs = 0 elseif hrs > 23 then hrs = 23 end
94
95             local min = math.floor((time_rat - hrs) * 60)
96             if min < 0 then min = 0 elseif min > 59 then min = 59 end
97
98             bat_now.time = string.format("%02d:%02d", hrs, min)
99
100             bat_now.perc = first_line(bstr .. "/capacity")
101
102             if not bat_now.perc then
103                 local perc = (rem / tot) * 100
104                 if perc <= 100 then
105                     bat_now.perc = string.format("%d", perc)
106                 elseif perc > 100 then
107                     bat_now.perc = "100"
108                 elseif perc < 0 then
109                     bat_now.perc = "0"
110                 end
111             end
112
113             if rate ~= nil and ratev ~= nil then
114                 bat_now.watt = string.format("%.2fW", (rate * ratev) / 1e12)
115             else
116                 bat_now.watt = "N/A"
117             end
118
119         end
120
121         widget = bat.widget
122         settings()
123
124         -- notifications for low and critical states
125         if bat_now.status == "Discharging" and notify == "on" and bat_now.perc ~= nil
126         then
127             local nperc = tonumber(bat_now.perc) or 100
128             if nperc <= 5
129             then
130                 bat.id = naughty.notify({
131                     preset = bat_notification_critical_preset,
132                     replaces_id = bat.id,
133                 }).id
134             elseif nperc <= 15
135             then
136                 bat.id = naughty.notify({
137                     preset = bat_notification_low_preset,
138                     replaces_id = bat.id,
139                 }).id
140             end
141         end
142     end
143
144     newtimer(battery, timeout, update)
145
146     return bat.widget
147 end
148
149 return setmetatable(bat, { __call = function(_, ...) return worker(...) end })