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3f9253faf20520dd3fb79b17cd40ec6113e0343b
[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 read_pipe    = require("lain.helpers").read_pipe
11
12 local async        = require("lain.asyncshell")
13 local json         = require("lain.util").dkjson
14 local lain_icons   = require("lain.helpers").icons_dir
15
16 local naughty      = require("naughty")
17 local wibox        = require("wibox")
18
19 local math         = { floor  = math.floor }
20 local mouse        = mouse
21 local string       = { format = string.format,
22                        gsub   = string.gsub }
23
24 local setmetatable = setmetatable
25
26 -- OpenWeatherMap
27 -- current weather and X-days forecast
28 -- lain.widgets.weather
29
30 local function worker(args)
31     local weather               = {}
32     local args                  = args or {}
33     local APPID                 = args.APPID or "3e321f9414eaedbfab34983bda77a66e" -- lain default
34     local timeout               = args.timeout or 900   -- 15 min
35     local timeout_forecast      = args.timeout or 86400 -- 24 hrs
36     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'"
37     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'"
38     local city_id               = args.city_id or 0 -- placeholder
39     local units                 = args.units or "metric"
40     local lang                  = args.lang or "en"
41     local cnt                   = args.cnt or 5
42     local date_cmd              = args.date_cmd or "date -u -d @%d +'%%a %%d'"
43     local icons_path            = args.icons_path or lain_icons .. "openweathermap/"
44     local notification_preset   = args.notification_preset or {}
45     local notification_text_fun = args.notification_text_fun or
46                                   function (wn)
47                                       local day = string.gsub(read_pipe(string.format(date_cmd, wn["dt"])), "\n", "")
48                                       local tmin = math.floor(wn["temp"]["min"])
49                                       local tmax = math.floor(wn["temp"]["max"])
50                                       local desc = wn["weather"][1]["description"]
51
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 followmouse           = args.followmouse or false
56     local settings              = args.settings or function() end
57
58     weather.widget    = wibox.widget.textbox(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 followmouse then
66             notification_preset.screen = mouse.screen
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         async.request(cmd, function(f)
96             local pos, err
97             weather_now, pos, err = json.decode(f, 1, nil)
98
99             if not err and weather_now 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
105                     if i < weather_now["cnt"] then
106                         weather.notification_text = weather.notification_text .. "\n"
107                     end
108                 end
109             else
110                 weather.notification_text = 0
111             end
112         end)
113     end
114
115     function weather.update()
116         local cmd = string.format(current_call, city_id, units, lang, APPID)
117         async.request(cmd, function(f)
118             local pos, err
119             weather_now, pos, err = json.decode(f, 1, nil)
120
121             if not err and weather_now and tonumber(weather_now["cod"]) == 200 then
122                 weather.icon_path = icons_path .. weather_now["weather"][1]["icon"] .. ".png"
123                 widget = weather.widget
124                 settings()
125             else
126                 weather.icon_path = icons_path .. "na.png"
127                 weather.widget:set_markup(weather_na_markup)
128             end
129
130             weather.icon:set_image(weather.icon_path)
131         end)
132     end
133
134     weather.attach(weather.widget)
135
136     newtimer("weather-" .. city_id, timeout, weather.update)
137     newtimer("weather_forecast-" .. city_id, timeout, weather.forecast_update)
138
139     return setmetatable(weather, { __index = weather.widget })
140 end
141
142 return setmetatable({}, { __call = function(_, ...) return worker(...) end })