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asyncshell: assert compatibility across multiple shells; #145 fix
[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 1 -- mandatory
34     local timeout               = args.timeout or 900   -- 15 min
35     local timeout_forecast      = args.timeout or 86400 -- 24 hrs
36     local current_call          = "curl -s 'http://api.openweathermap.org/data/2.5/weather?id=%s&units=%s&lang=%s&APPID=%s'"
37     local forecast_call         = "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 7
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 (day, desc, tmin, tmax)
47                                       return string.format("<b>%s</b>: %s, %d - %d  ", day, desc, tmin, tmax)
48                                   end
49     local followmouse           = args.followmouse or false
50     local settings              = args.settings or function() end
51
52     weather.widget = wibox.widget.textbox('')
53     weather.icon   = wibox.widget.imagebox()
54
55     function weather.show(t_out)
56         weather.hide()
57
58         if followmouse then
59             notification_preset.screen = mouse.screen
60         end
61
62         weather.notification = naughty.notify({
63             text    = weather.notification_text,
64             icon    = weather.icon_path,
65             timeout = t_out,
66             preset  = notification_preset
67         })
68     end
69
70     function weather.hide()
71         if weather.notification ~= nil then
72             naughty.destroy(weather.notification)
73             weather.notification = nil
74         end
75     end
76
77     function weather.attach(obj)
78         obj:connect_signal("mouse::enter", function()
79             weather.show(0)
80         end)
81         obj:connect_signal("mouse::leave", function()
82             weather.hide()
83         end)
84     end
85
86     function weather.forecast_update()
87         local cmd = string.format(forecast_call, city_id, units, lang, cnt, APPID)
88         async.request(cmd, function(f)
89             local pos, err
90             weather_now, pos, err = json.decode(f, 1, nil)
91
92             if not err and weather_now ~= nil and tonumber(weather_now["cod"]) == 200 then
93                 weather.notification_text = ''
94                 for i = 1, weather_now["cnt"] do
95                     local day = string.gsub(read_pipe(string.format(date_cmd, weather_now["list"][i]["dt"])), "\n", "")
96
97                     local tmin = math.floor(weather_now["list"][i]["temp"]["min"])
98                     local tmax = math.floor(weather_now["list"][i]["temp"]["max"])
99                     local desc = weather_now["list"][i]["weather"][1]["description"]
100
101                     weather.notification_text = weather.notification_text ..
102                                                 notification_text_fun(day, desc, tmin, tmax)
103
104                     if i < weather_now["cnt"] then
105                         weather.notification_text = weather.notification_text .. "\n"
106                     end
107                 end
108             else
109                 weather.icon_path = icons_path .. "na.png"
110                 weather.notification_text = "API/connection error or bad/not set city ID"
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 ~= nil and tonumber(weather_now["cod"]) == 200 then
122                 weather.icon_path = icons_path .. weather_now["weather"][1]["icon"] .. ".png"
123                 weather.icon:set_image(weather.icon_path)
124                 widget = weather.widget
125                 settings()
126             else
127                 weather.widget._layout.text = " N/A " -- tries to avoid textbox bugs
128                 weather.icon:set_image(icons_path .. "na.png")
129             end
130         end)
131     end
132
133     weather.attach(weather.widget)
134
135     newtimer("weather-" .. city_id, timeout, weather.update)
136     newtimer("weather_forecast-" .. city_id, timeout, weather.forecast_update)
137
138     return setmetatable(weather, { __index = weather.widget })
139 end
140
141 return setmetatable({}, { __call = function(_, ...) return worker(...) end })