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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 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 followmouse         = args.followmouse or false
45     local settings            = args.settings or function() end
46
47     weather.widget = wibox.widget.textbox('')
48     weather.icon   = wibox.widget.imagebox()
49
50     function weather.show(t_out)
51         weather.hide()
52
53         if followmouse then
54             notification_preset.screen = mouse.screen
55         end
56
57         weather.notification = naughty.notify({
58             text    = weather.notification_text,
59             icon    = weather.icon_path,
60             timeout = t_out,
61             preset  = notification_preset
62         })
63     end
64
65     function weather.hide()
66         if weather.notification ~= nil then
67             naughty.destroy(weather.notification)
68             weather.notification = nil
69         end
70     end
71
72     function weather.attach(obj)
73         obj:connect_signal("mouse::enter", function()
74             weather.show(0)
75         end)
76         obj:connect_signal("mouse::leave", function()
77             weather.hide()
78         end)
79     end
80
81     function weather.forecast_update()
82         local cmd = string.format(forecast_call, city_id, units, lang, cnt)
83         async.request(cmd, function(f)
84             weather_now, pos, err = json.decode(f, 1, nil)
85
86             if not err and weather_now ~= nil and tonumber(weather_now["cod"]) == 200 then
87                 weather.notification_text = ''
88                 for i = 1, weather_now["cnt"] do
89                     day = string.gsub(read_pipe(string.format(date_cmd, weather_now["list"][i]["dt"])), "\n", "")
90
91                     tmin = math.floor(weather_now["list"][i]["temp"]["min"])
92                     tmax = math.floor(weather_now["list"][i]["temp"]["max"])
93                     desc = weather_now["list"][i]["weather"][1]["description"]
94
95                     weather.notification_text = weather.notification_text ..
96                                                 string.format("<b>%s</b>: %s, %d - %d  ", day, desc, tmin, tmax)
97
98                     if i < weather_now["cnt"] then
99                         weather.notification_text = weather.notification_text .. "\n"
100                     end
101                 end
102             else
103                 weather.icon_path = icons_path .. "na.png"
104                 weather.notification_text = "API/connection error or bad/not set city ID"
105             end
106         end)
107     end
108
109     function weather.update()
110         local cmd = string.format(current_call, city_id, units, lang)
111         async.request(cmd, function(f)
112             weather_now, pos, err = json.decode(f, 1, nil)
113
114             if not err and weather_now ~= nil and tonumber(weather_now["cod"]) == 200 then
115                 weather.icon_path = icons_path .. weather_now["weather"][1]["icon"] .. ".png"
116                 weather.icon:set_image(weather.icon_path)
117                 widget = weather.widget
118                 settings()
119             else
120                 weather.widget._layout.text = " N/A " -- tries to avoid textbox bugs
121                 weather.icon:set_image(icons_path .. "na.png")
122             end
123         end)
124     end
125
126     weather.attach(weather.widget)
127
128     newtimer("weather-" .. city_id, timeout, weather.update)
129     newtimer("weather_forecast" .. city_id, timeout, weather.forecast_update)
130
131     return setmetatable(weather, { __index = weather.widget })
132 end
133
134 return setmetatable({}, { __call = function(_, ...) return worker(...) end })