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readme updated
[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
19 local setmetatable = setmetatable
20
21 -- Battery infos
22 -- lain.widgets.bat
23 local bat = {}
24
25 local function worker(args)
26     local args = args or {}
27     local timeout = args.timeout or 30
28     local battery = args.battery or "BAT0"
29     local settings = args.settings or function() end
30
31     bat.widget = wibox.widget.textbox('')
32
33     function update()
34         bat_now = {
35             status = "Not present",
36             perc   = "N/A",
37             time   = "N/A",
38             watt   = "N/A"
39         }
40
41         local present = first_line("/sys/class/power_supply/"
42                                    .. battery
43                                    .. "/present")
44
45         if present == "1"
46         then
47             local rate = first_line("/sys/class/power_supply/"
48                                     .. battery ..
49                                     "/power_now")
50             local ratev = first_line("/sys/class/power_supply/"
51                                     .. battery ..
52                                      "/voltage_now")
53             local rem = first_line("/sys/class/power_supply/"
54                                     .. battery ..
55                                    "/energy_now")
56             local tot = first_line("/sys/class/power_supply/"
57                                     .. battery ..
58                                    "/energy_full")
59             bat_now.status = first_line("/sys/class/power_supply/"
60                                     .. battery ..
61                                    "/status")
62
63             local time_rat = 0
64             if bat_now.status == "Charging"
65             then
66                 time_rat = (tot - rem) / rate
67             elseif bat_now.status == "Discharging"
68             then
69                 time_rat = rem / rate
70             end
71
72             local hrs = math.floor(time_rat)
73             local min = (time_rat - hrs) * 60
74
75             bat_now.time = string.format("%02d:%02d", hrs, min)
76             bat_now.perc = (rem / tot) * 100
77             bat_now.watt = string.format("%.2fW", (rate * ratev) / 1e12)
78
79             -- notifications for low and critical states
80             if bat_now.perc <= 5
81             then
82                 bat.id = naughty.notify({
83                     text = "shutdown imminent",
84                     title = "battery nearly exhausted",
85                     position = "top_right",
86                     timeout = 15,
87                     fg="#000000",
88                     bg="#ffffff",
89                     ontop = true,
90                     replaces_id = bat.id
91                 }).id
92             elseif bat_now.perc <= 15
93             then
94                 bat.id = naughty.notify({
95                     text = "plug the cable",
96                     title = "battery low",
97                     position = "top_right",
98                     timeout = 15,
99                     fg="#202020",
100                     bg="#cdcdcd",
101                     ontop = true,
102                     replaces_id = bat.id
103                 }).id
104             end
105
106             bat_now.perc = string.format("%d", bat_now.perc)
107         end
108
109         widget = bat.widget
110         settings()
111     end
112
113     newtimer("bat", timeout, update)
114
115     return bat.widget
116 end
117
118 return setmetatable(bat, { __call = function(_, ...) return worker(...) end })