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9ab4ce683e91f33c71fbbd13e0123ea3687ec3d0
[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 astr    = "/sys/class/power_supply/" .. ac
63                 local present = first_line(bstr .. "/present")
64
65                 if present == "1"
66                 then
67                         -- current_now(I)[uA], voltage_now(U)[uV], power_now(P)[uW]
68                         local rate_current      = tonumber(first_line(bstr .. "/current_now"))
69                         local rate_voltage      = tonumber(first_line(bstr .. "/voltage_now"))
70                         local rate_power        = tonumber(first_line(bstr .. "/power_now"))
71
72                         -- energy_now(P)[uWh], charge_now(I)[uAh] 
73                         local energy_now        = tonumber(first_line(bstr .. "/energy_now") or
74                                                                                 first_line(bstr .. "/charge_now"))
75                                                   
76                         -- energy_full(P)[uWh], charge_full(I)[uAh],                       
77                         local energy_full       = tonumber(first_line(bstr .. "/energy_full") or
78                                                                                 first_line(bstr .. "/charge_full"))
79
80
81                         local energy_percentage = tonumber(first_line(bstr .. "/capacity")) or
82                                                                                 math.floor((energy_now / energy_full) * 100)
83
84                         bat_now.status = first_line(bstr .. "/status") or "N/A"
85                         bat_now.ac_status     = first_line(astr .. "/online") or "N/A"
86
87                         -- if rate = 0 or rate not defined skip the round
88                         if      not (rate_power and rate_power > 0) and 
89                                 not (rate_current and  rate_current > 0) and
90                                 not bat_now.status == "Full"
91                         then
92                                 return 
93                         end
94                         
95                         local rate_time = 0
96                         if bat_now.status == "Charging"
97                         then
98                                 rate_time = (energy_full - energy_now) / rate_power or rate_current
99                         elseif bat_now.status == "Discharging"
100                         then
101                                 rate_time = energy_now / rate_power or rate_current
102                         end
103
104                         local hours   = math.floor(rate_time)
105                         local minutes = math.floor((rate_time - hours) * 60)
106
107                         bat_now.perc = string.format("%d", energy_percentage)
108                         bat_now.time = string.format("%02d:%02d", hours, minutes)
109                         bat_now.watt = string.format("%.2fW", rate_power / 1e6 or (rate_voltage * rate_current)  / 1e12)
110                 
111                 end
112                 widget = bat.widget
113                 settings()
114
115                 -- notifications for low and critical states
116                 if bat_now.status == "Discharging" and notify == "on" and bat_now.perc
117                 then
118                         local nperc = tonumber(bat_now.perc) or 100
119                         if nperc <= 5
120                         then
121                                 bat.id = naughty.notify({
122                                         preset = bat_notification_critical_preset,
123                                         replaces_id = bat.id,
124                                 }).id
125                         elseif nperc <= 15
126                         then
127                                 bat.id = naughty.notify({
128                                         preset = bat_notification_low_preset,
129                                         replaces_id = bat.id,
130                                 }).id
131                         end
132                 end
133         end
134
135         newtimer(battery, timeout, update)
136
137         return setmetatable(bat, { __index = bat.widget })
138 end
139
140 return setmetatable({}, { __call = function(_, ...) return worker(...) end })