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fixing issue in case of nil rate_power in bat widget
[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" then
97                            rate_time = (energy_full - energy_now) / rate_power or rate_current
98                         elseif bat_now.status == "Discharging" then
99                            rate_time = energy_now / (rate_power or rate_current)
100                         end
101
102                         local hours   = math.floor(rate_time)
103                         local minutes = math.floor((rate_time - hours) * 60)
104                         
105                         local watt    = rate_power and (rate_power / 1e6) or (rate_voltage * rate_current) / 1e12
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", watt)
110                 end
111
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 then
117                         local nperc = tonumber(bat_now.perc) or 100
118                         if nperc <= 5 then
119                                 bat.id = naughty.notify({
120                                         preset = bat_notification_critical_preset,
121                                         replaces_id = bat.id,
122                                 }).id
123                         elseif nperc <= 15 then
124                                 bat.id = naughty.notify({
125                                         preset = bat_notification_low_preset,
126                                         replaces_id = bat.id,
127                                 }).id
128                         end
129                 end
130         end
131
132         newtimer(battery, timeout, update)
133
134         return setmetatable(bat, { __index = bat.widget })
135 end
136
137 return setmetatable({}, { __call = function(_, ...) return worker(...) end })