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