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[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 newtimer     = require("lain.helpers").newtimer
10 local async        = require("lain.asyncshell")
11 local json         = require("lain.util").dkjson
12 local lain_icons   = require("lain.helpers").icons_dir
13 local naughty      = require("naughty")
14 local wibox        = require("wibox")
15
16 local math         = { floor  = math.floor }
17 local string       = { format = string.format,
18                        gsub   = string.gsub }
19
20 local setmetatable = setmetatable
21
22 -- OpenWeatherMap
23 -- current weather and X-days forecast
24 -- lain.widgets.weather
25
26 local function worker(args)
27     local weather               = {}
28     local args                  = args or {}
29     local timeout               = args.timeout or 900   -- 15 min
30     local timeout_forecast      = args.timeout or 86400 -- 24 hrs
31     local current_call          = "curl -s 'http://api.openweathermap.org/data/2.5/weather?id=%s&units=%s&lang=%s'"
32     local forecast_call         = "curl -s 'http://api.openweathermap.org/data/2.5/forecast/daily?id=%s&units=%s&lang=%s&cnt=%s'"
33     local city_id               = args.city_id
34     local units                 = args.units or "metric"
35     local lang                  = args.lang or "en"
36     local cnt                   = args.cnt or 7
37     local date_cmd              = args.date_cmd or "date -u -d @%d +'%%a %%d'"
38     local icons_path            = args.icons_path or lain_icons .. "openweathermap/"
39     local w_notification_preset = args.w_notification_preset or {}
40     local settings              = args.settings or function() end
41
42     weather.widget = wibox.widget.textbox('')
43     weather.icon   = wibox.widget.imagebox()
44
45     function weather.show(t_out)
46         weather.hide()
47         weather.notification = naughty.notify({
48             text    = weather.notification_text,
49             icon    = weather.icon_path,
50             timeout = t_out,
51             preset  = w_notification_preset
52         })
53     end
54
55     function weather.hide()
56         if weather.notification ~= nil then
57             naughty.destroy(weather.notification)
58             weather.notification = nil
59         end
60     end
61
62     function weather.attach(obj)
63         obj:connect_signal("mouse::enter", function()
64             weather.show(0)
65         end)
66         obj:connect_signal("mouse::leave", function()
67             weather.hide()
68         end)
69     end
70
71     function weather.forecast_update()
72         local cmd = string.format(forecast_call, city_id, units, lang, cnt)
73         async.request(cmd, function(f)
74             j = f:read("*a")
75             f:close()
76             weather_now, pos, err = json.decode(j, 1, nil)
77
78             if tonumber(weather_now["cod"]) == 200 then
79                 weather.notification_text = ''
80                 for i = 1, weather_now["cnt"] do
81                     local f = assert(io.popen(string.format(date_cmd, weather_now["list"][i]["dt"])))
82                     day = string.gsub(f:read("a"), "\n", "")
83                     f:close()
84
85                     tmin = math.floor(weather_now["list"][i]["temp"]["min"])
86                     tmax = math.floor(weather_now["list"][i]["temp"]["max"])
87                     desc = weather_now["list"][i]["weather"][1]["description"]
88
89                     weather.notification_text = weather.notification_text ..
90                                                 string.format("<b>%s</b>: %s, %d - %d  ", day, desc, tmin, tmax)
91
92                     if i < weather_now["cnt"] then
93                         weather.notification_text = weather.notification_text .. "\n"
94                     end
95                 end
96             end
97         end)
98     end
99
100     function weather.update()
101         local cmd = string.format(current_call, city_id, units, lang)
102         async.request(cmd, function(f)
103             j = f:read("*a")
104             f:close()
105             weather_now, pos, err = json.decode(j, 1, nil)
106
107             if err then
108                 weather.widget.set_text("N/A")
109                 weather.icon:set_image(icons_path .. "na.png")
110             elseif tonumber(weather_now["cod"]) == 200 then
111                 weather.icon_path = icons_path .. weather_now["weather"][1]["icon"] .. ".png"
112                 weather.icon:set_image(weather.icon_path)
113                 widget = weather.widget
114                 settings()
115             end
116         end)
117     end
118
119     newtimer("weather", timeout, weather.update)
120     newtimer("weather_forecast", timeout, weather.forecast_update)
121
122     return setmetatable(weather, { __index = weather.widget })
123 end
124
125 return setmetatable({}, { __call = function(_, ...) return worker(...) end })