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c7563d5ad14a6ee1735f8cca5568737d7a8bd198
[etc/awesome.git] / widget / weather.lua
1 --[[
2
3      Licensed under GNU General Public License v2
4       * (c) 2015, Luke Bonham
5
6 --]]
7
8 local helpers  = require("lain.helpers")
9 local json     = require("lain.util").dkjson
10 local focused  = require("awful.screen").focused
11 local naughty  = require("naughty")
12 local wibox    = require("wibox")
13
14 local math, os, string, tonumber = math, os, string, tonumber
15
16 -- OpenWeatherMap
17 -- current weather and X-days forecast
18 -- lain.widget.weather
19
20 local function factory(args)
21     local weather               = { widget = wibox.widget.textbox() }
22     local args                  = args or {}
23     local APPID                 = args.APPID or "3e321f9414eaedbfab34983bda77a66e" -- lain default
24     local timeout               = args.timeout or 60 * 15 -- 15 min
25     local timeout_forecast      = args.timeout or 60 * 60 * 24 -- 24 hrs
26     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'"
27     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'"
28     local city_id               = args.city_id or 0 -- placeholder
29     local utc_offset            = args.utc_offset or
30                                   function ()
31                                       local now = os.time()
32                                       return os.difftime(now, os.time(os.date("!*t", now))) + ((os.date("*t").isdst and 1 or 0) * 3600)
33                                   end
34     local units                 = args.units or "metric"
35     local lang                  = args.lang or "en"
36     local cnt                   = args.cnt or 5
37     local date_cmd              = args.date_cmd or "date -u -d @%d +'%%a %%d'"
38     local icons_path            = args.icons_path or helpers.icons_dir .. "openweathermap/"
39     local notification_preset   = args.notification_preset or {}
40     local notification_text_fun = args.notification_text_fun or
41                                   function (wn)
42                                       local day = os.date("%a %d", wn["dt"])
43                                       local tmin = math.floor(wn["temp"]["min"])
44                                       local tmax = math.floor(wn["temp"]["max"])
45                                       local desc = wn["weather"][1]["description"]
46                                       return string.format("<b>%s</b>: %s, %d - %d ", day, desc, tmin, tmax)
47                                   end
48     local weather_na_markup     = args.weather_na_markup or " N/A "
49     local followtag             = args.followtag or false
50     local showpopup             = args.showpopup or "on"
51     local settings              = args.settings or function() end
52
53     weather.widget:set_markup(weather_na_markup)
54     weather.icon_path = icons_path .. "na.png"
55     weather.icon = wibox.widget.imagebox(weather.icon_path)
56
57     function weather.show(t_out)
58         weather.hide()
59
60         if followtag then
61             notification_preset.screen = focused()
62         end
63
64         if not weather.notification_text then
65             weather.update()
66             weather.forecast_update()
67         end
68
69         weather.notification = naughty.notify({
70             text    = weather.notification_text,
71             icon    = weather.icon_path,
72             timeout = t_out,
73             preset  = notification_preset
74         })
75     end
76
77     function weather.hide()
78         if weather.notification then
79             naughty.destroy(weather.notification)
80             weather.notification = nil
81         end
82     end
83
84     function weather.attach(obj)
85         obj:connect_signal("mouse::enter", function()
86             weather.show(0)
87         end)
88         obj:connect_signal("mouse::leave", function()
89             weather.hide()
90         end)
91     end
92
93     function weather.forecast_update()
94         local cmd = string.format(forecast_call, city_id, units, lang, cnt, APPID)
95         helpers.async(cmd, function(f)
96             local pos, err
97             weather_now, pos, err = json.decode(f, 1, nil)
98
99             if not err and type(weather_now) == "table" and tonumber(weather_now["cod"]) == 200 then
100                 weather.notification_text = ""
101                 for i = 1, weather_now["cnt"] do
102                     weather.notification_text = weather.notification_text ..
103                                                 notification_text_fun(weather_now["list"][i])
104                     if i < weather_now["cnt"] then
105                         weather.notification_text = weather.notification_text .. "\n"
106                     end
107                 end
108             end
109         end)
110     end
111
112     function weather.update()
113         local cmd = string.format(current_call, city_id, units, lang, APPID)
114         helpers.async(cmd, function(f)
115             local pos, err, icon
116             weather_now, pos, err = json.decode(f, 1, nil)
117
118             if not err and type(weather_now) == "table" and tonumber(weather_now["cod"]) == 200 then
119                 local sunrise = tonumber(weather_now["sys"]["sunrise"])
120                 local sunset  = tonumber(weather_now["sys"]["sunset"])
121                 local icon    = weather_now["weather"][1]["icon"]
122                 local now     = os.time()
123                 local loc_m   = os.time { year = os.date("%Y"), month = os.date("%m"), day = os.date("%d"), hour = 0 }
124                 local offset  = utc_offset()
125                 local utc_m   = loc_m - offset
126
127                 -- if we are 1 day after the GMT, return 1 day back, and viceversa
128                 if offset > 0 and (now - utc_m) >= 86400 then
129                     utc_m = utc_m + 86400
130                 elseif offset < 0 and (utc_m - now) >= 86400 then
131                     utc_m = utc_m - 86400
132                 end
133
134                 if sunrise <= now and now <= sunset then
135                     icon = string.gsub(icon, "n", "d")
136                 else
137                     icon = string.gsub(icon, "d", "n")
138                 end
139
140                 weather.icon_path = icons_path .. icon .. ".png"
141                 widget = weather.widget
142                 settings()
143             else
144                 weather.icon_path = icons_path .. "na.png"
145                 weather.widget:set_markup(weather_na_markup)
146             end
147
148             weather.icon:set_image(weather.icon_path)
149         end)
150     end
151
152     if showpopup == "on" then weather.attach(weather.widget) end
153
154     weather.timer = helpers.newtimer("weather-" .. city_id, timeout, weather.update, false, true)
155     weather.timer_forecast = helpers.newtimer("weather_forecast-" .. city_id, timeout, weather.forecast_update, false, true)
156
157     return weather
158 end
159
160 return factory