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