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-------------------------------------------------
-- Weather Widget based on the OpenWeatherMap
-- https://openweathermap.org/
--
-- @author Pavel Makhov
-- @copyright 2018 Pavel Makhov
-------------------------------------------------
local socket = require("socket")
local http = require("socket.http")
local ltn12 = require("ltn12")
local json = require("json")
local naughty = require("naughty")
local wibox = require("wibox")
local gears = require("gears")
local path_to_icons = "/usr/share/icons/Arc/status/symbolic/"
local weather_widget = {}
local function worker(args)
local args = args or {}
local font = args.font or 'Play 9'
local city = args.city or 'Montreal,ca'
local api_key = args.api_key or naughty.notify{preset = naughty.config.presets.critical, text = 'OpenweatherMap API key is not set'}
local units = args.units or 'metric'
local both_units_widget = args.both_units_widget or false
local both_units_popup = args.both_units_popup or false
local position = args.notification_position or "top_right"
local weather_api_url = (
'https://api.openweathermap.org/data/2.5/weather'
.. '?q=' .. city
.. '&appid=' .. api_key
.. '&units=' .. units
)
local icon_widget = wibox.widget {
{
id = "icon",
resize = false,
widget = wibox.widget.imagebox,
},
layout = wibox.container.margin(_, 0, 0, 3),
set_image = function(self, path)
self.icon.image = path
end,
}
local temp_widget = wibox.widget {
font = font,
widget = wibox.widget.textbox,
}
weather_widget = wibox.widget {
icon_widget,
temp_widget,
layout = wibox.layout.fixed.horizontal,
}
--- Maps openWeatherMap icons to Arc icons
local icon_map = {
["01d"] = "weather-clear-symbolic.svg",
["02d"] = "weather-few-clouds-symbolic.svg",
["03d"] = "weather-clouds-symbolic.svg",
["04d"] = "weather-overcast-symbolic.svg",
["09d"] = "weather-showers-scattered-symbolic.svg",
["10d"] = "weather-showers-symbolic.svg",
["11d"] = "weather-storm-symbolic.svg",
["13d"] = "weather-snow-symbolic.svg",
["50d"] = "weather-fog-symbolic.svg",
["01n"] = "weather-clear-night-symbolic.svg",
["02n"] = "weather-few-clouds-night-symbolic.svg",
["03n"] = "weather-clouds-night-symbolic.svg",
["04n"] = "weather-overcast-symbolic.svg",
["09n"] = "weather-showers-scattered-symbolic.svg",
["10n"] = "weather-showers-symbolic.svg",
["11n"] = "weather-storm-symbolic.svg",
["13n"] = "weather-snow-symbolic.svg",
["50n"] = "weather-fog-symbolic.svg"
}
--- Return wind direction as a string.
local function to_direction(degrees)
-- Ref: https://www.campbellsci.eu/blog/convert-wind-directions
if degrees == nil then
return "Unknown dir"
end
local directions = {
"N",
"NNE",
"NE",
"ENE",
"E",
"ESE",
"SE",
"SSE",
"S",
"SSW",
"SW",
"WSW",
"W",
"WNW",
"NW",
"NNW",
"N",
}
return directions[math.floor((degrees % 360) / 22.5) + 1]
end
-- Convert degrees Celsius to Fahrenheit
local function celsius_to_fahrenheit(c)
return c*9/5+32
end
-- Convert degrees Fahrenheit to Celsius
local function fahrenheit_to_celsius(f)
return (f-32)*5/9
end
local weather_timer = gears.timer({ timeout = 60 })
local resp
local function gen_temperature_str(temp, fmt_str, show_other_units)
local temp_str = string.format(fmt_str, temp)
local s = temp_str .. '°' .. (units == 'metric' and 'C' or 'F')
if (show_other_units) then
local temp_conv, units_conv
if (units == 'metric') then
temp_conv = celsius_to_fahrenheit(temp)
units_conv = 'F'
else
temp_conv = fahrenheit_to_celsius(temp)
units_conv = 'C'
end
local temp_conv_str = string.format(fmt_str, temp_conv)
s = s .. ' ' .. '('.. temp_conv_str .. '°' .. units_conv .. ')'
end
return s
end
local function error_display(resp_json)
weather_timer.timeout = math.min(15 * 60, weather_timer.timeout * 2)
weather_timer:again()
local err_resp = json.decode(resp_json)
naughty.notify{
title = 'Weather Widget Error',
text = err_resp.message,
preset = naughty.config.presets.critical,
}
end
weather_timer:connect_signal("timeout", function ()
local resp_json = {}
local res, status = http.request{
url=weather_api_url,
sink=ltn12.sink.table(resp_json),
-- ref:
-- http://w3.impa.br/~diego/software/luasocket/old/luasocket-2.0/http.html
create=function()
-- ref: https://stackoverflow.com/a/6021774/595220
local req_sock = socket.tcp()
-- 't' — overall timeout
req_sock:settimeout(0.2, 't')
-- 'b' — block timeout
req_sock:settimeout(0.001, 'b')
return req_sock
end
}
if (resp_json ~= nil) then
resp_json = table.concat(resp_json)
end
if (status ~= 200 and resp_json ~= nil and resp_json ~= '') then
if (not pcall(error_display, resp_json)) then
naughty.notify{
title = 'Weather Widget Error',
text = 'Cannot parse answer',
preset = naughty.config.presets.critical,
}
end
elseif (resp_json ~= nil and resp_json ~= '') then
resp = json.decode(resp_json)
icon_widget.image = path_to_icons .. icon_map[resp.weather[1].icon]
temp_widget:set_text(gen_temperature_str(resp.main.temp, '%.0f', both_units_widget))
weather_timer.timeout = 60
weather_timer:again()
end
end)
weather_timer:start()
weather_timer:emit_signal("timeout")
--- Notification with weather information. Popups when mouse hovers over the icon
local notification
weather_widget:connect_signal("mouse::enter", function()
notification = naughty.notify{
icon = path_to_icons .. icon_map[resp.weather[1].icon],
icon_size=20,
text =
'<big>' .. resp.weather[1].main .. ' (' .. resp.weather[1].description .. ')</big><br>' ..
'<b>Humidity:</b> ' .. resp.main.humidity .. '%<br>' ..
'<b>Temperature:</b> ' .. gen_temperature_str(resp.main.temp, '%.1f',
both_units_popup) .. '<br>' ..
'<b>Pressure:</b> ' .. resp.main.pressure .. 'hPa<br>' ..
'<b>Clouds:</b> ' .. resp.clouds.all .. '%<br>' ..
'<b>Wind:</b> ' .. resp.wind.speed .. 'm/s (' .. to_direction(resp.wind.deg) .. ')',
timeout = 5, hover_timeout = 10,
position = position,
width = (both_units_popup == true and 210 or 200)
}
end)
weather_widget:connect_signal("mouse::leave", function()
naughty.destroy(notification)
end)
return weather_widget
end
return setmetatable(weather_widget, { __call = function(_, ...)
return worker(...)
end })
|
