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smapi: round remaining hour estimation
[etc/awesome.git] / widgets / contrib / tpbat / init.lua
1
2 --[[
3                                                                
4      tpbat.lua                                                 
5      Battery status widget for ThinkPad laptops that use SMAPI 
6      lain.widgets.contrib.tpbat                                
7                                                                
8      More on tp_smapi: http://www.thinkwiki.org/wiki/Tp_smapi  
9                                                                
10      Licensed under GNU General Public License v2              
11       * (c) 2013,      Conor Heine                             
12       * (c) 2013,      Luke Bonham                             
13       * (c) 2010-2012, Peter Hofmann                           
14                                                                
15 --]]
16
17 local debug        = { getinfo = debug.getinfo }
18 local newtimer     = require("lain.helpers").newtimer
19 local first_line   = require("lain.helpers").first_line
20 local beautiful    = require("beautiful")
21 local naughty      = require("naughty")
22 local wibox        = require("wibox")
23
24 local string       = { format = string.format }
25 local math         = { floor = math.floor }
26 local tostring     = tostring
27 local setmetatable = setmetatable
28
29 package.path       = debug.getinfo(1,"S").source:match[[^@?(.*[\/])[^\/]-$]] .. "?.lua;" .. package.path
30 local smapi        = require("smapi")
31
32 -- ThinkPad SMAPI-enabled battery info widget
33 -- lain.widgets.contrib.tpbat
34 local tpbat = { }
35 local tpbat_notification = nil
36
37 function tpbat:hide()
38     if tpbat_notification ~= nil
39     then
40         naughty.destroy(tpbat_notification)
41         tpbat_notification = nil
42     end
43 end
44
45 function tpbat:show(t_out)
46     tpbat:hide()
47
48     local bat   = self.bat
49     local t_out = t_out or 0
50
51     if bat == nil or not bat:installed() then return end
52
53     local mfgr   = bat:get('manufacturer') or "no_mfgr"
54     local model  = bat:get('model') or "no_model"
55     local chem   = bat:get('chemistry') or "no_chem"
56     local status = bat:get('state') or "nil"
57     local time   = bat:remaining_time()
58     local msg    = "\t"
59
60     if status ~= "idle" and status ~= "nil"
61     then
62         if time == "N/A"
63         then
64             msg = "...Calculating time remaining..."
65         else
66             msg = time .. (status == "charging" and " until charged" or " remaining")
67         end
68     else
69         msg = "On AC Power"
70     end
71
72     local str = string.format("%s : %s %s (%s)\n", bat.name, mfgr, model, chem)
73                 .. string.format("\n%s \t\t\t %s", status:upper(), msg)
74
75     tpbat_notification = naughty.notify({
76         preset = { fg = beautiful.fg_normal },
77         text = str,
78         timeout = t_out,
79         screen = client.focus and client.focus.screen or 1
80     })
81 end
82
83 function tpbat.register(args)
84     local args = args or {}
85     local timeout = args.timeout or 30
86     local battery = args.battery or "BAT0"
87     local settings = args.settings or function() end
88
89     tpbat.bat = smapi:battery(battery) -- Create a new battery
90     local bat = tpbat.bat
91
92     tpbat.widget = wibox.widget.textbox('')
93
94     bat_notification_low_preset = {
95         title = "Battery low",
96         text = "Plug the cable!",
97         timeout = 15,
98         fg = "#202020",
99         bg = "#CDCDCD"
100     }
101
102     bat_notification_critical_preset = {
103         title = "Battery exhausted",
104         text = "Shutdown imminent",
105         timeout = 15,
106         fg = "#000000",
107         bg = "#FFFFFF"
108     }
109
110     if bat:get('state') == nil
111     then
112         local n = naughty.notify({
113             preset = bat_notification_low_preset,
114             title = "SMAPI Battery Warning: Unable to read battery state!",
115             text = "This widget is intended for ThinkPads. Is tp_smapi installed? Check your configs & paths.",
116             screen = client.focus and client.focus.screen or 1
117         })
118     end
119
120     function update()
121         bat_now = {
122             status = "Not present",
123             perc   = "N/A",
124             time   = "N/A",
125             watt   = "N/A"
126         }
127
128         if bat:installed()
129         then
130             bat_now.status = bat:status() or "N/A"
131             bat_now.perc   = bat:percent()
132             bat_now.time   = bat:remaining_time()
133             -- bat_now.watt = string.format("%.2fW", (VOLTS * AMPS) / 1e12)
134
135             -- notifications for low and critical states (when discharging)
136             if bat_now.status == "discharging"
137             then
138                 if bat_now.perc <= 5
139                 then
140                     tpbat.id = naughty.notify({
141                         preset = bat_notification_critical_preset,
142                         replaces_id = tpbat.id,
143                         screen = client.focus and client.focus.screen or 1
144                     }).id
145                 elseif bat_now.perc <= 15
146                 then
147                     tpbat.id = naughty.notify({
148                         preset = bat_notification_low_preset,
149                         replaces_id = tpbat.id,
150                         screen = client.focus and client.focus.screen or 1
151                     }).id
152                 end
153             end
154
155             bat_now.perc = tostring(bat_now.perc)
156         end
157
158         widget = tpbat.widget
159         settings()
160     end
161
162     newtimer("tpbat", timeout, update)
163
164     widget:connect_signal('mouse::enter', function () tpbat:show() end)
165     widget:connect_signal('mouse::leave', function () tpbat:hide() end)
166
167     return tpbat.widget
168 end
169
170 return setmetatable(tpbat, { __call = function(_, ...) return tpbat.register(...) end })