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9740bbed1e75ee0b0655b3295e73eeb65937a9dd
[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
25 local function worker(args)
26     local bat      = {}
27     local args     = args or {}
28     local timeout  = args.timeout or 30
29     local battery  = args.battery or "BAT0"
30     local ac       = args.ac or "AC0"
31     local notify   = args.notify or "on"
32     local settings = args.settings or function() end
33
34     bat.widget = wibox.widget.textbox('')
35
36     bat_notification_low_preset = {
37         title = "Battery low",
38         text = "Plug the cable!",
39         timeout = 15,
40         fg = "#202020",
41         bg = "#CDCDCD"
42     }
43
44     bat_notification_critical_preset = {
45         title = "Battery exhausted",
46         text = "Shutdown imminent",
47         timeout = 15,
48         fg = "#000000",
49         bg = "#FFFFFF"
50     }
51
52     function update()
53         bat_now = {
54             status    = "Not present",
55             ac_status = "N/A",
56             perc      = "N/A",
57             time      = "N/A",
58             watt      = "N/A"
59         }
60
61         local bstr    = "/sys/class/power_supply/" .. battery
62         local present = first_line(bstr .. "/present")
63
64         if present == "1"
65         then
66             local rate     = first_line(bstr .. "/power_now")
67
68             local rate_alt = first_line(bstr .. "/current_now")
69
70             local ratev    = first_line(bstr .. "/voltage_now")
71
72             local rem      = first_line(bstr .. "/energy_now") or
73                              first_line(bstr .. "/charge_now")
74
75             local tot      = first_line(bstr .. "/energy_full") or
76                              first_line(bstr .. "/charge_full")
77
78             bat_now.status = first_line(bstr .. "/status") or "N/A"
79             bat_now.ac     = first_line(string.format("/sys/class/power_supply/%s/online", ac)) or "N/A"
80
81             rate  = tonumber(rate)
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             local perc = tonumber(first_line(bstr .. "/capacity")) or math.floor((rem / tot) * 100)
104
105             if perc <= 100 then
106                 bat_now.perc = string.format("%d", perc)
107             elseif perc > 100 then
108                 bat_now.perc = "100"
109             elseif perc < 0 then
110                 bat_now.perc = "0"
111             end
112
113             if rate and ratev then
114                 bat_now.watt = string.format("%.2fW", (rate * ratev) / 1e12)
115             elseif rate_alt then
116                 bat_now.watt = string.format("%.2fW", rate_alt)
117             else
118                 bat_now.watt = "N/A"
119             end
120
121         end
122
123         widget = bat.widget
124         settings()
125
126         -- notifications for low and critical states
127         if bat_now.status == "Discharging" and notify == "on" and bat_now.perc
128         then
129             local nperc = tonumber(bat_now.perc) or 100
130             if nperc <= 5
131             then
132                 bat.id = naughty.notify({
133                     preset = bat_notification_critical_preset,
134                     replaces_id = bat.id,
135                 }).id
136             elseif nperc <= 15
137             then
138                 bat.id = naughty.notify({
139                     preset = bat_notification_low_preset,
140                     replaces_id = bat.id,
141                 }).id
142             end
143         end
144     end
145
146     newtimer(battery, timeout, update)
147
148     return setmetatable(bat, { __index = bat.widget })
149 end
150
151 return setmetatable({}, { __call = function(_, ...) return worker(...) end })