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