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readme updated
[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 mouse        = mouse
18 local string       = { format = string.format,
19                        gsub   = string.gsub }
20
21 local setmetatable = setmetatable
22
23 -- OpenWeatherMap
24 -- current weather and X-days forecast
25 -- lain.widgets.weather
26
27 local function worker(args)
28     local weather             = {}
29     local args                = args or {}
30     local timeout             = args.timeout or 900   -- 15 min
31     local timeout_forecast    = args.timeout or 86400 -- 24 hrs
32     local current_call        = "curl -s 'http://api.openweathermap.org/data/2.5/weather?id=%s&units=%s&lang=%s'"
33     local forecast_call       = "curl -s 'http://api.openweathermap.org/data/2.5/forecast/daily?id=%s&units=%s&lang=%s&cnt=%s'"
34     local city_id             = args.city_id or 0 -- placeholder
35     local units               = args.units or "metric"
36     local lang                = args.lang or "en"
37     local cnt                 = args.cnt or 7
38     local date_cmd            = args.date_cmd or "date -u -d @%d +'%%a %%d'"
39     local icons_path          = args.icons_path or lain_icons .. "openweathermap/"
40     local notification_preset = args.notification_preset or {}
41     local followmouse         = args.followmouse or false
42     local settings            = args.settings or function() end
43
44     weather.widget = wibox.widget.textbox('')
45     weather.icon   = wibox.widget.imagebox()
46
47     function weather.show(t_out)
48         weather.hide()
49
50         if followmouse then
51             notification_preset.screen = mouse.screen
52         end
53
54         weather.notification = naughty.notify({
55             text    = weather.notification_text,
56             icon    = weather.icon_path,
57             timeout = t_out,
58             preset  = notification_preset
59         })
60     end
61
62     function weather.hide()
63         if weather.notification ~= nil then
64             naughty.destroy(weather.notification)
65             weather.notification = nil
66         end
67     end
68
69     function weather.attach(obj)
70         obj:connect_signal("mouse::enter", function()
71             weather.show(0)
72         end)
73         obj:connect_signal("mouse::leave", function()
74             weather.hide()
75         end)
76     end
77
78     function weather.forecast_update()
79         local cmd = string.format(forecast_call, city_id, units, lang, cnt)
80         async.request(cmd, function(f)
81             weather_now, pos, err = json.decode(f, 1, nil)
82
83             if not err and weather_now ~= nil and tonumber(weather_now["cod"]) == 200 then
84                 weather.notification_text = ''
85                 for i = 1, weather_now["cnt"] do
86                     local f = assert(io.popen(string.format(date_cmd, weather_now["list"][i]["dt"])))
87                     day = string.gsub(f:read("*all"), "\n", "")
88                     f:close()
89
90                     tmin = math.floor(weather_now["list"][i]["temp"]["min"])
91                     tmax = math.floor(weather_now["list"][i]["temp"]["max"])
92                     desc = weather_now["list"][i]["weather"][1]["description"]
93
94                     weather.notification_text = weather.notification_text ..
95                                                 string.format("<b>%s</b>: %s, %d - %d  ", day, desc, tmin, tmax)
96
97                     if i < weather_now["cnt"] then
98                         weather.notification_text = weather.notification_text .. "\n"
99                     end
100                 end
101             else
102                 weather.icon_path = icons_path .. "na.png"
103                 weather.notification_text = "API/connection error or bad/not set city ID"
104             end
105         end)
106     end
107
108     function weather.update()
109         local cmd = string.format(current_call, city_id, units, lang)
110         async.request(cmd, function(f)
111             weather_now, pos, err = json.decode(f, 1, nil)
112
113             if not err and weather_now ~= nil and tonumber(weather_now["cod"]) == 200 then
114                 weather.icon_path = icons_path .. weather_now["weather"][1]["icon"] .. ".png"
115                 weather.icon:set_image(weather.icon_path)
116                 widget = weather.widget
117                 settings()
118             else
119                 weather.widget._layout.text = " N/A " -- tries to avoid textbox bugs
120                 weather.icon:set_image(icons_path .. "na.png")
121             end
122         end)
123     end
124
125     weather.attach(weather.widget)
126
127     newtimer("weather-" .. city_id, timeout, weather.update)
128     newtimer("weather_forecast" .. city_id, timeout, weather.forecast_update)
129
130     return setmetatable(weather, { __index = weather.widget })
131 end
132
133 return setmetatable({}, { __call = function(_, ...) return worker(...) end })