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