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tpbat wiki entry added
[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 bstr  = "/sys/class/power_supply/" .. battery
42
43         local present = first_line(bstr .. "/present")
44
45         if present == "1"
46         then
47             local rate  = first_line(bstr .. "/power_now") or
48                           first_line(bstr .. "/current_now")
49
50             local ratev = first_line(bstr .. "/voltage_now")
51
52             local rem   = first_line(bstr .. "/energy_now") or
53                           first_line(bstr .. "/charge_now")
54
55             local tot   = first_line(bstr .. "/energy_full") or
56                           first_line(bstr .. "/charge_full")
57
58             bat_now.status = first_line(bstr .. "/status") or "N/A"
59
60             local time_rat = 0
61             if bat_now.status == "Charging"
62             then
63                 time_rat = (tot - rem) / rate
64             elseif bat_now.status == "Discharging"
65             then
66                 time_rat = rem / rate
67             end
68
69             local hrs = math.floor(time_rat)
70             local min = (time_rat - hrs) * 60
71
72             bat_now.time = string.format("%02d:%02d", hrs, min)
73             bat_now.perc = (rem / tot) * 100
74             bat_now.watt = string.format("%.2fW", (rate * ratev) / 1e12)
75
76             -- notifications for low and critical states
77             if bat_now.perc <= 5
78             then
79                 bat.id = naughty.notify({
80                     text = "shutdown imminent",
81                     title = "battery nearly exhausted",
82                     position = "top_right",
83                     timeout = 15,
84                     fg="#000000",
85                     bg="#ffffff",
86                     ontop = true,
87                     replaces_id = bat.id
88                 }).id
89             elseif bat_now.perc <= 15
90             then
91                 bat.id = naughty.notify({
92                     text = "plug the cable",
93                     title = "battery low",
94                     position = "top_right",
95                     timeout = 15,
96                     fg="#202020",
97                     bg="#cdcdcd",
98                     ontop = true,
99                     replaces_id = bat.id
100                 }).id
101             end
102
103             bat_now.perc = string.format("%d", bat_now.perc)
104         end
105
106         widget = bat.widget
107         settings()
108     end
109
110     newtimer("bat", timeout, update)
111
112     return bat.widget
113 end
114
115 return setmetatable(bat, { __call = function(_, ...) return worker(...) end })