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d18af87b35001ab4021627fc74e451902e283a8b
[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 helpers      = require("lain.helpers")
11 local naughty      = require("naughty")
12 local wibox        = require("wibox")
13
14 local math         = { floor  = math.floor }
15 local string       = { format = string.format }
16 local tonumber     = tonumber
17
18 local setmetatable = setmetatable
19
20 -- Battery infos
21 -- lain.widgets.bat
22
23 local function worker(args)
24     local bat = {}
25     local args = args or {}
26     local timeout = args.timeout or 30
27     local battery = args.battery or "BAT0"
28     local notify = args.notify or "on"
29     local settings = args.settings or function() end
30
31     bat.widget = wibox.widget.textbox('')
32
33     bat_notification_low_preset = {
34         title = "Battery low",
35         text = "Plug the cable!",
36         timeout = 15,
37         fg = "#202020",
38         bg = "#CDCDCD"
39     }
40
41     bat_notification_critical_preset = {
42         title = "Battery exhausted",
43         text = "Shutdown imminent",
44         timeout = 15,
45         fg = "#000000",
46         bg = "#FFFFFF"
47     }
48
49     helpers.set_map(battery .. "status", "N/A")
50     helpers.set_map(battery .. "perc", "N/A")
51     helpers.set_map(battery .. "time", "N/A")
52     helpers.set_map(battery .. "watt", "N/A")
53
54     function update()
55         bat_now = {
56             status = "Not present",
57             perc   = "N/A",
58             time   = "N/A",
59             watt   = "N/A"
60         }
61
62         local bstr  = "/sys/class/power_supply/" .. battery
63
64         local present = helpers.first_line(bstr .. "/present")
65
66         if present == "1"
67         then
68             local rate  = helpers.first_line(bstr .. "/power_now") or
69                           helpers.first_line(bstr .. "/current_now")
70
71             local ratev = helpers.first_line(bstr .. "/voltage_now")
72
73             local rem   = helpers.first_line(bstr .. "/energy_now") or
74                           helpers.first_line(bstr .. "/charge_now")
75
76             local tot   = helpers.first_line(bstr .. "/energy_full") or
77                           helpers.first_line(bstr .. "/charge_full")
78
79             bat_now.status = helpers.first_line(bstr .. "/status") or "N/A"
80
81             rate  = tonumber(rate) or 1
82             ratev = tonumber(ratev)
83             rem   = tonumber(rem)
84             tot   = tonumber(tot)
85
86             local time_rat = 0
87             if bat_now.status == "Charging"
88             then
89                 time_rat = (tot - rem) / rate
90             elseif bat_now.status == "Discharging"
91             then
92                 time_rat = rem / rate
93             end
94
95             local hrs = math.floor(time_rat)
96             if hrs < 0 then hrs = 0 elseif hrs > 23 then hrs = 23 end
97
98             local min = math.floor((time_rat - hrs) * 60)
99             if min < 0 then min = 0 elseif min > 59 then min = 59 end
100
101             bat_now.time = string.format("%02d:%02d", hrs, min)
102
103             bat_now.perc = helpers.first_line(bstr .. "/capacity")
104
105             if not bat_now.perc then
106                 local perc = (rem / tot) * 100
107                 if perc <= 100 then
108                     bat_now.perc = string.format("%d", perc)
109                 elseif perc > 100 then
110                     bat_now.perc = "100"
111                 elseif perc < 0 then
112                     bat_now.perc = "0"
113                 end
114             end
115
116             if rate ~= nil and ratev ~= nil then
117                 bat_now.watt = string.format("%.2fW", (rate * ratev) / 1e12)
118             else
119                 bat_now.watt = "N/A"
120             end
121         end
122
123         if bat_now.status ~= helpers.get_map(battery .. "status")
124            or bat_now.perc ~= helpers.get_map(battery .. "perc")
125            or bat_now.time ~= helpers.get_map(battery .. "time")
126            or bat_now.watt ~= helpers.get_map(battery .. "watt")
127         then
128             widget = bat.widget
129             settings()
130
131             helpers.set_map(battery .. "status", bat_now.status)
132             helpers.set_map(battery .. "perc", bat_now.perc)
133             helpers.set_map(battery .. "time", bat_now.time)
134             helpers.set_map(battery .. "watt", bat_now.watt)
135         end
136
137         -- notifications for low and critical states
138         if bat_now.status == "Discharging" and notify == "on" and bat_now.perc ~= nil
139         then
140             local nperc = tonumber(bat_now.perc) or 100
141             if nperc <= 5
142             then
143                 bat.id = naughty.notify({
144                     preset = bat_notification_critical_preset,
145                     replaces_id = bat.id,
146                 }).id
147             elseif nperc <= 15
148             then
149                 bat.id = naughty.notify({
150                     preset = bat_notification_low_preset,
151                     replaces_id = bat.id,
152                 }).id
153             end
154         end
155     end
156
157     helpers.newtimer(battery, timeout, update)
158
159     return bat.widget
160 end
161
162 return setmetatable(bat, { __call = function(_, ...) return worker(...) end })