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Fix for local vs utc time offset
[etc/awesome.git] / widgets / weather.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2015, Luke Bonham                     
6                                                   
7 --]]
8
9 local helpers      = require("lain.helpers")
10 local json         = require("lain.util").dkjson
11 local focused      = require("awful.screen").focused
12 local naughty      = require("naughty")
13 local wibox        = require("wibox")
14 local math         = { floor    = math.floor }
15 local os           = { time     = os.time,
16                        date     = os.date,
17                        difftime = os.difftime }
18 local string       = { format   = string.format,
19                        gsub     = string.gsub }
20 local tonumber     = tonumber
21 local setmetatable = setmetatable
22
23 -- OpenWeatherMap
24 -- current weather and X-days forecast
25 -- lain.widgets.weather
26
27 local function worker(args)
28     local weather               = { widget = wibox.widget.textbox() }
29     local args                  = args or {}
30     local APPID                 = args.APPID or "3e321f9414eaedbfab34983bda77a66e" -- lain default
31     local timeout               = args.timeout or 900   -- 15 min
32     local timeout_forecast      = args.timeout or 86400 -- 24 hrs
33     local current_call          = args.current_call  or "curl -s 'http://api.openweathermap.org/data/2.5/weather?id=%s&units=%s&lang=%s&APPID=%s'"
34     local forecast_call         = args.forecast_call or "curl -s 'http://api.openweathermap.org/data/2.5/forecast/daily?id=%s&units=%s&lang=%s&cnt=%s&APPID=%s'"
35     local city_id               = args.city_id or 0 -- placeholder
36     local utc_offset            = args.utc_offset or
37                                   function ()
38                                       local now = os.time()
39                                       return os.difftime(now, os.time(os.date("!*t", now))) + ((os.date("*t").isdst and 1 or 0) * 3600)
40                                   end
41     local units                 = args.units or "metric"
42     local lang                  = args.lang or "en"
43     local cnt                   = args.cnt or 5
44     local date_cmd              = args.date_cmd or "date -u -d @%d +'%%a %%d'"
45     local icons_path            = args.icons_path or helpers.icons_dir .. "openweathermap/"
46     local notification_preset   = args.notification_preset or {}
47     local notification_text_fun = args.notification_text_fun or
48                                   function (wn)
49                                       local day = os.date("%a %d", wn["dt"])
50                                       local tmin = math.floor(wn["temp"]["min"])
51                                       local tmax = math.floor(wn["temp"]["max"])
52                                       local desc = wn["weather"][1]["description"]
53                                       return string.format("<b>%s</b>: %s, %d - %d ", day, desc, tmin, tmax)
54                                   end
55     local weather_na_markup     = args.weather_na_markup or " N/A "
56     local followtag             = args.followtag or false
57     local settings              = args.settings or function() end
58
59     weather.widget:set_markup(weather_na_markup)
60     weather.icon_path = icons_path .. "na.png"
61     weather.icon = wibox.widget.imagebox(weather.icon_path)
62
63     function weather.show(t_out)
64         weather.hide()
65
66         if followtag then
67             notification_preset.screen = focused()
68         end
69
70         if not weather.notification_text then
71             weather.update()
72             weather.forecast_update()
73         end
74
75         weather.notification = naughty.notify({
76             text    = weather.notification_text,
77             icon    = weather.icon_path,
78             timeout = t_out,
79             preset  = notification_preset
80         })
81     end
82
83     function weather.hide()
84         if weather.notification then
85             naughty.destroy(weather.notification)
86             weather.notification = nil
87         end
88     end
89
90     function weather.attach(obj)
91         obj:connect_signal("mouse::enter", function()
92             weather.show(0)
93         end)
94         obj:connect_signal("mouse::leave", function()
95             weather.hide()
96         end)
97     end
98
99     function weather.forecast_update()
100         local cmd = string.format(forecast_call, city_id, units, lang, cnt, APPID)
101         helpers.async(cmd, function(f)
102             local pos, err
103             weather_now, pos, err = json.decode(f, 1, nil)
104
105             if not err and type(weather_now) == "table" and tonumber(weather_now["cod"]) == 200 then
106                 weather.notification_text = ''
107                 for i = 1, weather_now["cnt"] do
108                     weather.notification_text = weather.notification_text ..
109                                                 notification_text_fun(weather_now["list"][i])
110
111                     if i < weather_now["cnt"] then
112                         weather.notification_text = weather.notification_text .. "\n"
113                     end
114                 end
115             end
116         end)
117     end
118
119     function weather.update()
120         local cmd = string.format(current_call, city_id, units, lang, APPID)
121         helpers.async(cmd, function(f)
122             local pos, err, icon
123             weather_now, pos, err = json.decode(f, 1, nil)
124
125             if not err and type(weather_now) == "table" and tonumber(weather_now["cod"]) == 200 then
126                 -- weather icon based on localtime
127                 local now     = os.time()
128                 local sunrise = tonumber(weather_now["sys"]["sunrise"])
129                 local sunset  = tonumber(weather_now["sys"]["sunset"])
130                 local icon    = weather_now["weather"][1]["icon"]
131                 local loc_m   = os.time { year = os.date("%Y"), month = os.date("%m"), day = os.date("%d"), hour = 0 }
132                 local offset  = utc_offset()
133                 local utc_m   = loc_m - offset
134
135                 if offset > 0 and (now - utc_m)>=86400 then
136                     utc_m = utc_m + 86400
137                 elseif offset < 0 and (utc_m - now)>=86400 then
138                     utc_m = utc_m - 86400
139                 end
140
141                 -- if we are 1 day after the GMT, return 1 day back, and viceversa
142                 if offset > 0 and loc_m >= utc_m then
143                     now = now - 86400
144                 elseif offset < 0 and loc_m <= utc_m then
145                     now = now + 86400
146                 end
147
148                 if sunrise <= now and now <= sunset then
149                     icon = string.gsub(icon, "n", "d")
150                 else
151                     icon = string.gsub(icon, "d", "n")
152                 end
153
154                 weather.icon_path = icons_path .. icon .. ".png"
155                 widget = weather.widget
156                 settings()
157             else
158                 weather.icon_path = icons_path .. "na.png"
159                 weather.widget:set_markup(weather_na_markup)
160             end
161
162             weather.icon:set_image(weather.icon_path)
163         end)
164     end
165
166     weather.attach(weather.widget)
167
168     weather.timer = helpers.newtimer("weather-" .. city_id, timeout, weather.update, false, true)
169     weather.timer_forecast = helpers.newtimer("weather_forecast-" .. city_id, timeout, weather.forecast_update, false, true)
170
171     return weather
172 end
173
174 return setmetatable({}, { __call = function(_, ...) return worker(...) end })