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Merge branch 'master' of https://github.com/copycat-killer/lain
[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 timeout               = args.timeout or 900   -- 15 min
34     local timeout_forecast      = args.timeout or 86400 -- 24 hrs
35     local current_call          = "curl -s 'http://api.openweathermap.org/data/2.5/weather?id=%s&units=%s&lang=%s'"
36     local forecast_call         = "curl -s 'http://api.openweathermap.org/data/2.5/forecast/daily?id=%s&units=%s&lang=%s&cnt=%s'"
37     local city_id               = args.city_id or 0 -- placeholder
38     local units                 = args.units or "metric"
39     local lang                  = args.lang or "en"
40     local cnt                   = args.cnt or 7
41     local date_cmd              = args.date_cmd or "date -u -d @%d +'%%a %%d'"
42     local icons_path            = args.icons_path or lain_icons .. "openweathermap/"
43     local notification_preset   = args.notification_preset or {}
44     local notification_text_fun = args.notification_text_fun or
45                                   function (day, desc, tmin, tmax)
46                                       return string.format("<b>%s</b>: %s, %d - %d  ", day, desc, tmin, tmax)
47                                   end
48     local followmouse           = args.followmouse or false
49     local settings              = args.settings or function() end
50
51     weather.widget = wibox.widget.textbox('')
52     weather.icon   = wibox.widget.imagebox()
53
54     function weather.show(t_out)
55         weather.hide()
56
57         if followmouse then
58             notification_preset.screen = mouse.screen
59         end
60
61         weather.notification = naughty.notify({
62             text    = weather.notification_text,
63             icon    = weather.icon_path,
64             timeout = t_out,
65             preset  = notification_preset
66         })
67     end
68
69     function weather.hide()
70         if weather.notification ~= nil then
71             naughty.destroy(weather.notification)
72             weather.notification = nil
73         end
74     end
75
76     function weather.attach(obj)
77         obj:connect_signal("mouse::enter", function()
78             weather.show(0)
79         end)
80         obj:connect_signal("mouse::leave", function()
81             weather.hide()
82         end)
83     end
84
85     function weather.forecast_update()
86         local cmd = string.format(forecast_call, city_id, units, lang, cnt)
87         async.request(cmd, function(f)
88             local pos, err
89             weather_now, pos, err = json.decode(f, 1, nil)
90
91             if not err and weather_now ~= nil and tonumber(weather_now["cod"]) == 200 then
92                 weather.notification_text = ''
93                 for i = 1, weather_now["cnt"] do
94                     local day = string.gsub(read_pipe(string.format(date_cmd, weather_now["list"][i]["dt"])), "\n", "")
95
96                     local tmin = math.floor(weather_now["list"][i]["temp"]["min"])
97                     local tmax = math.floor(weather_now["list"][i]["temp"]["max"])
98                     local desc = weather_now["list"][i]["weather"][1]["description"]
99
100                     weather.notification_text = weather.notification_text ..
101                                                 notification_text_fun(day, desc, tmin, tmax)
102
103                     if i < weather_now["cnt"] then
104                         weather.notification_text = weather.notification_text .. "\n"
105                     end
106                 end
107             else
108                 weather.icon_path = icons_path .. "na.png"
109                 weather.notification_text = "API/connection error or bad/not set city ID"
110             end
111         end)
112     end
113
114     function weather.update()
115         local cmd = string.format(current_call, city_id, units, lang)
116         async.request(cmd, function(f)
117             local pos, err
118             weather_now, pos, err = json.decode(f, 1, nil)
119
120             if not err and weather_now ~= nil and tonumber(weather_now["cod"]) == 200 then
121                 weather.icon_path = icons_path .. weather_now["weather"][1]["icon"] .. ".png"
122                 weather.icon:set_image(weather.icon_path)
123                 widget = weather.widget
124                 settings()
125             else
126                 weather.widget._layout.text = " N/A " -- tries to avoid textbox bugs
127                 weather.icon:set_image(icons_path .. "na.png")
128             end
129         end)
130     end
131
132     weather.attach(weather.widget)
133
134     newtimer("weather-" .. city_id, timeout, weather.update)
135     newtimer("weather_forecast-" .. city_id, timeout, weather.forecast_update)
136
137     return setmetatable(weather, { __index = weather.widget })
138 end
139
140 return setmetatable({}, { __call = function(_, ...) return worker(...) end })