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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 focused      = require("awful.screen").focused
17 local naughty      = require("naughty")
18 local wibox        = require("wibox")
19
20 local math         = { floor    = math.floor }
21 local os           = { time     = os.time,
22                        date     = os.date,
23                        difftime = os.difftime }
24 local string       = { format   = string.format,
25                        gsub     = string.gsub }
26
27 local mouse        = mouse
28 local tonumber     = tonumber
29 local setmetatable = setmetatable
30
31 -- OpenWeatherMap
32 -- current weather and X-days forecast
33 -- lain.widgets.weather
34
35 local function worker(args)
36     local weather               = {}
37     local args                  = args or {}
38     local APPID                 = args.APPID or "3e321f9414eaedbfab34983bda77a66e" -- lain default
39     local timeout               = args.timeout or 900   -- 15 min
40     local timeout_forecast      = args.timeout or 86400 -- 24 hrs
41     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'"
42     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'"
43     local city_id               = args.city_id or 0 -- placeholder
44     local utc_offset            = args.utc_offset or
45                                   function ()
46                                       local now = os.time()
47                                       return os.difftime(now, os.time(os.date("!*t", now))) + ((os.date("*t").isdst and 1 or 0) * 3600)
48                                   end
49     local units                 = args.units or "metric"
50     local lang                  = args.lang or "en"
51     local cnt                   = args.cnt or 5
52     local date_cmd              = args.date_cmd or "date -u -d @%d +'%%a %%d'"
53     local icons_path            = args.icons_path or lain_icons .. "openweathermap/"
54     local notification_preset   = args.notification_preset or {}
55     local notification_text_fun = args.notification_text_fun or
56                                   function (wn)
57                                       local day = string.gsub(read_pipe(string.format(date_cmd, wn["dt"])), "\n", "")
58                                       local tmin = math.floor(wn["temp"]["min"])
59                                       local tmax = math.floor(wn["temp"]["max"])
60                                       local desc = wn["weather"][1]["description"]
61                                       return string.format("<b>%s</b>: %s, %d - %d ", day, desc, tmin, tmax)
62                                   end
63     local weather_na_markup     = args.weather_na_markup or " N/A "
64     local followtag           = args.followtag or false
65     local settings              = args.settings or function() end
66
67     weather.widget    = wibox.widget.textbox(weather_na_markup)
68     weather.icon_path = icons_path .. "na.png"
69     weather.icon      = wibox.widget.imagebox(weather.icon_path)
70
71     function weather.show(t_out)
72         weather.hide()
73
74         if followtag then
75             notification_preset.screen = focused()
76         end
77
78         if not weather.notification_text then
79             weather.forecast_update()
80         end
81
82         weather.notification = naughty.notify({
83             text    = weather.notification_text,
84             icon    = weather.icon_path,
85             timeout = t_out,
86             preset  = notification_preset
87         })
88     end
89
90     function weather.hide()
91         if weather.notification then
92             naughty.destroy(weather.notification)
93             weather.notification = nil
94         end
95     end
96
97     function weather.attach(obj)
98         obj:connect_signal("mouse::enter", function()
99             weather.show(0)
100         end)
101         obj:connect_signal("mouse::leave", function()
102             weather.hide()
103         end)
104     end
105
106     function weather.forecast_update()
107         local cmd = string.format(forecast_call, city_id, units, lang, cnt, APPID)
108         async.request(cmd, function(f)
109             local pos, err
110             weather_now, pos, err = json.decode(f, 1, nil)
111
112             if not err and type(weather_now) == "table" and tonumber(weather_now["cod"]) == 200 then
113                 weather.notification_text = ''
114                 for i = 1, weather_now["cnt"] do
115                     weather.notification_text = weather.notification_text ..
116                                                 notification_text_fun(weather_now["list"][i])
117
118                     if i < weather_now["cnt"] then
119                         weather.notification_text = weather.notification_text .. "\n"
120                     end
121                 end
122             end
123         end)
124     end
125
126     function weather.update()
127         local cmd = string.format(current_call, city_id, units, lang, APPID)
128         async.request(cmd, function(f)
129             local pos, err, icon
130             weather_now, pos, err = json.decode(f, 1, nil)
131
132             if not err and type(weather_now) == "table" and tonumber(weather_now["cod"]) == 200 then
133                 -- weather icon based on localtime
134                 local now     = os.time()
135                 local sunrise = tonumber(weather_now["sys"]["sunrise"])
136                 local sunset  = tonumber(weather_now["sys"]["sunset"])
137                 local icon    = weather_now["weather"][1]["icon"]
138                 local utc_m   = string.gsub(read_pipe(string.format("date -u -d 'today 00:00:00' +'%%s'")), "\n", "")
139                 local loc_m   = string.gsub(read_pipe(string.format("date -d 'today 00:00:00' +'%%s'")), "\n", "")
140
141                 loc_m  = tonumber(loc_m)
142                 utc_m  = tonumber(utc_m)
143                 offset = utc_offset()
144
145                 -- if we are 1 day after the GMT, return 1 day back, and viceversa
146                 if offset > 0 and loc_m >= utc_m then
147                     now = now - 86400
148                 elseif offset < 0 and loc_m <= utc_m then
149                     now = now + 86400
150                 end
151
152                 if sunrise <= now and now <= sunset then
153                     icon = string.gsub(icon, "n", "d")
154                 else
155                     icon = string.gsub(icon, "d", "n")
156                 end
157
158                 weather.icon_path = icons_path .. icon .. ".png"
159                 widget = weather.widget
160                 settings()
161             else
162                 weather.icon_path = icons_path .. "na.png"
163                 weather.widget:set_markup(weather_na_markup)
164             end
165
166             weather.icon:set_image(weather.icon_path)
167         end)
168     end
169
170     weather.attach(weather.widget)
171
172     newtimer("weather-" .. city_id, timeout, weather.update)
173     newtimer("weather_forecast-" .. city_id, timeout, weather.forecast_update)
174
175     return setmetatable(weather, { __index = weather.widget })
176 end
177
178 return setmetatable({}, { __call = function(_, ...) return worker(...) end })