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-- Authors: Andrea Rossato <arossato@istitutocolli.org>, Sergey Kozhemyakin <luc@server.by>
-- License: GPL, version 2 or later
-- Last Changed: 2008
--
-- statusd_weather.lua
-- statusd_weather.lua: an Ion3 statusd applet for displaying weather information
-- based on weather.lua by Andrea Rossato arossato AT istitutocolli DOT org
-- Here's the list of all available data:
-- %weather_location
-- %weather_country
-- %weather_date
-- %weather_time (UTC)
-- %weather_timestamp (timestamp of the latest report: your local time.)
-- %weather_tempF (Fahrenheit)
-- %weather_tempC (Celsius)
-- %weather_dewpointF (Fahrenheit)
-- %weather_dewpointC (Celsius)
-- %weather_humidity
-- %weather_pressure (hPa)
-- %weather_wind
-- %weather_windspeed (MPH)
-- %weather_windchillF (Fahrenheit)
-- %weather_windchillC (Celsius)
-- %weather_sky
-- %weather_weather
-- LEGAL
-- Copyright (C) 2006 Andrea Rossato arossato AT istitutocolli DOT org
-- Copyright (C) 2008 Sergey Kozhemyakin luc AT server DOT by
-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License
-- as published by the Free Software Foundation; either version 2
-- of the License, or (at your option) any later version.
-- This software is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
-- Have a nice weather :)
local defaults = {
update_interval = 30 * 60 * 1000, -- every 30 minutes
station = "UMGG",
timestamp_format = "%F %H:%M", -- strftime format
gmt_offset = nil, -- offset from gmt in seconds. should be calculated automaticaly but may be specified manualy
}
local settings = table.join(statusd.get_config("weather"), defaults)
local weather_timer = statusd.create_timer()
local wget_timer = statusd.create_timer()
local get_weather
local function calculate_gmt_offset()
-- offset (+|-)(\d\d)(\d\d)
local off = {}
_, _, off.sign, off.hour, off.min = string.find(os.date("%z", os.time()), "([-+])(%d%d)(%d%d)")
settings.gmt_offset = (off.hour * 60 + off.min) * 60
if off.sign == '-' then settings.gmt_offset = -settings.gmt_offset end
end
local function reformat_time(date, time)
local dt = {}
_, _, dt.year, dt.month, dt.day = string.find(date, "(%d+)%.(%d+)%.(%d+)")
_, _, dt.hour, dt.min = string.find(time, "(%d%d)(%d%d)")
os.setlocale(os.getenv("LANG"), "time")
return os.date(settings.timestamp_format, os.time(dt) + settings.gmt_offset)
end
local function parse_weather(s)
local w = {}
_, _, w.location, w.country = string.find(s, "^(.+)%,%s(.+)%(%u+%)" )
_, _, w.date, w.time = string.find(s, ".+%/%s([%d.]+)%s(%d+)%sUTC" )
_, _, w.wind, w.windspeed = string.find(s, "Wind%:%s(.+%sat%s(%d+)%sMPH)" )
_, _, w.sky = string.find(s, "Sky%sconditions:%s(.-)%c" )
_, _, w.tempF, w.tempC = string.find(s, "Temperature:%s(-?%d*%.?%d+)%sF%s%((-?%d*%.?%d+)%sC%)%c" )
_, _, w.dewpointF, w.dewpointC = string.find(s, "Dew%sPoint:%s(-?%d*%.?%d+)%sF%s%((-?%d*%.?%d+)%sC%)" )
_, _, w.windchillF, w.windchillC = string.find(s, "Windchill:%s(-?%d*%.?%d+)%sF%s%((-?%d*%.?%d+)%sC%)" )
_, _, w.humidity = string.find(s, "Relative%sHumidity:%s(%d+)%%")
_, _, w.pressure = string.find(s, "Pressure%s%b():.-%((%d+)%shPa%)" )
_, _, w.weather = string.find(s, "Weather:%s(.-)%c" )
if w.date and w.time then
w.timestamp = reformat_time(w.date, w.time)
else
w.timestamp = "undef"
end
return w
end
local function load_weather()
local f = io.open ("/tmp/".. settings.station..".dat")
if not f then return nil end
local s = f:read("*all")
f:close()
os.execute("rm ".."/tmp/".. settings.station..".dat")
return parse_weather(s)
end
local function update_weather()
local w = load_weather()
if w then
for i,v in pairs(w) do
if not v then v = "N/A" end
statusd.inform("weather_"..i, v);
end
end
weather_timer:set(settings.update_interval, get_weather)
end
local function check_wget()
local filename = "/tmp/wget_"..settings.station.."_status.txt"
local f = io.open (filename)
if not f then
weather_timer:set(settings.update_interval, get_weather)
return nil
end
local s = f:read("*all")
f:close()
if not string.match(s, "100%%") then
-- wget still downloading. resetting timer
wget_timer:set(2000, check_wget)
else
-- wget finished. so we need parse file and update info
os.execute("rm "..filename)
update_weather()
end
end
get_weather = function ()
local url = "http://weather.noaa.gov/pub/data/observations/metar/decoded/"
local command = "wget -b -o /tmp/wget_"..settings.station.."_status.txt -O /tmp/"..settings.station..".dat "..url..settings.station..".TXT"
os.execute(command)
-- start watching timer -- when wget will exit -- update weather
wget_timer:set(2000, check_wget)
end
if not settings.gmt_offset then
calculate_gmt_offset()
end
get_weather()
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