widget/weather.lua

   1 --[[
   2
   3      Licensed under GNU General Public License v2
   4       * (c) 2015, Luca CPZ
   5
   6 --]]
   7
   8 local helpers  = require("lain.helpers")
   9 local json     = require("lain.util").dkjson
  10 local focused  = require("awful.screen").focused
  11 local naughty  = require("naughty")
  12 local wibox    = require("wibox")
  13 local math     = math
  14 local os       = os
  15 local string   = string
  16 local type     = type
  17 local tonumber = tonumber
  18
  19 -- OpenWeatherMap
  20 -- current weather and X-days forecast
  21 -- lain.widget.weather
  22
  23 local function factory(args)
  24     local weather               = { widget = wibox.widget.textbox() }
  25     local args                  = args or {}
  26     local APPID                 = args.APPID or "3e321f9414eaedbfab34983bda77a66e" -- lain's default
  27     local timeout               = args.timeout or 60 * 15 -- 15 min
  28     local timeout_forecast      = args.timeout or 60 * 60 * 24 -- 24 hrs
  29     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'"
  30     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'"
  31     local city_id               = args.city_id or 0 -- placeholder
  32     local units                 = args.units or "metric"
  33     local lang                  = args.lang or "en"
  34     local cnt                   = args.cnt or 5
  35     local date_cmd              = args.date_cmd or "date -u -d @%d +'%%a %%d'"
  36     local icons_path            = args.icons_path or helpers.icons_dir .. "openweathermap/"
  37     local notification_preset   = args.notification_preset or {}
  38     local notification_text_fun = args.notification_text_fun or
  39                                   function (wn)
  40                                       local day = os.date("%a %d", wn["dt"])
  41                                       local tmin = math.floor(wn["temp"]["min"])
  42                                       local tmax = math.floor(wn["temp"]["max"])
  43                                       local desc = wn["weather"][1]["description"]
  44                                       return string.format("<b>%s</b>: %s, %d - %d ", day, desc, tmin, tmax)
  45                                   end
  46     local weather_na_markup     = args.weather_na_markup or " N/A "
  47     local followtag             = args.followtag or false
  48     local showpopup             = args.showpopup or "on"
  49     local settings              = args.settings or function() end
  50
  51     weather.widget:set_markup(weather_na_markup)
  52     weather.icon_path = icons_path .. "na.png"
  53     weather.icon = wibox.widget.imagebox(weather.icon_path)
  54
  55     function weather.show(seconds)
  56         weather.hide()
  57
  58         if followtag then
  59             notification_preset.screen = focused()
  60         end
  61
  62         if not weather.notification_text then
  63             weather.update()
  64             weather.forecast_update()
  65         end
  66
  67         weather.notification = naughty.notify {
  68             preset  = notification_preset,
  69             text    = weather.notification_text,
  70             icon    = weather.icon_path,
  71             timeout = type(seconds == "number") and seconds or notification_preset.timeout
  72         }
  73     end
  74
  75     function weather.hide()
  76         if weather.notification then
  77             naughty.destroy(weather.notification)
  78             weather.notification = nil
  79         end
  80     end
  81
  82     function weather.attach(obj)
  83         obj:connect_signal("mouse::enter", function()
  84             weather.show(0)
  85         end)
  86         obj:connect_signal("mouse::leave", function()
  87             weather.hide()
  88         end)
  89     end
  90
  91     function weather.forecast_update()
  92         local cmd = string.format(forecast_call, city_id, units, lang, cnt, APPID)
  93         helpers.async(cmd, function(f)
  94             local pos, err
  95             weather_now, pos, err = json.decode(f, 1, nil)
  96
  97             if not err and type(weather_now) == "table" and tonumber(weather_now["cod"]) == 200 then
  98                 weather.notification_text = ""
  99                 for i = 1, weather_now["cnt"] do
 100                     weather.notification_text = weather.notification_text ..
 101                                                 notification_text_fun(weather_now["list"][i])
 102                     if i < weather_now["cnt"] then
 103                         weather.notification_text = weather.notification_text .. "\n"
 104                     end
 105                 end
 106             end
 107         end)
 108     end
 109
 110     function weather.update()
 111         local cmd = string.format(current_call, city_id, units, lang, APPID)
 112         helpers.async(cmd, function(f)
 113             local pos, err, icon
 114             weather_now, pos, err = json.decode(f, 1, nil)
 115
 116             if not err and type(weather_now) == "table" and tonumber(weather_now["cod"]) == 200 then
 117                 local sunrise = tonumber(weather_now["sys"]["sunrise"])
 118                 local sunset  = tonumber(weather_now["sys"]["sunset"])
 119                 local icon    = weather_now["weather"][1]["icon"]
 120                 local loc_now = os.time()
 121
 122                 if sunrise <= loc_now and loc_now <= sunset then
 123                     icon = string.gsub(icon, "n", "d")
 124                 else
 125                     icon = string.gsub(icon, "d", "n")
 126                 end
 127
 128                 weather.icon_path = icons_path .. icon .. ".png"
 129                 widget = weather.widget
 130                 settings()
 131             else
 132                 weather.icon_path = icons_path .. "na.png"
 133                 weather.widget:set_markup(weather_na_markup)
 134             end
 135
 136             weather.icon:set_image(weather.icon_path)
 137         end)
 138     end
 139
 140     if showpopup == "on" then weather.attach(weather.widget) end
 141
 142     weather.timer = helpers.newtimer("weather-" .. city_id, timeout, weather.update, false, true)
 143     weather.timer_forecast = helpers.newtimer("weather_forecast-" .. city_id, timeout, weather.forecast_update, false, true)
 144
 145     return weather
 146 end
 147
 148 return factory