80 lines
3.2 KiB
Lua
80 lines
3.2 KiB
Lua
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-- Licensed under the GNU General Public License version 2
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-- * Copyright (C) 2009 Adrian C. <anrxc_sysphere_org>
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----------------------------------------------------------
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-- {{{ Grab environment
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local io = { popen = io.popen }
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local setmetatable = setmetatable
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local math = { floor = math.floor }
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local string = { match = string.match }
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-- }}}
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-- Weather: provides weather information for a requested station
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module("vicious.weather")
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-- {{{ Weather widget type
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local function worker(format, station)
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-- US National Oceanic and Atmospheric Administration
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-- * Station (ICAO) codes: http://www.rap.ucar.edu/weather/surface/stations.txt
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local noaa = "http://weather.noaa.gov/pub/data/observations/metar/decoded/"
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-- Get info from a weather station
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local f = io.popen("curl --max-time 3 -f -s "..noaa..station..".TXT")
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local ws = f:read("*all")
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f:close()
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-- Setup tables
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local weather = {
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-- Some of the weather symbols would look nice if prepended to
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-- the final output, but it is up to the user to do that
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-- * http://www.alanwood.net/unicode/miscellaneous_symbols.html
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["{city}"] = "N/A",
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["{wind}"] = "N/A",
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["{windmph}"] = "N/A",
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["{windkmh}"] = "N/A",
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["{sky}"] = "N/A",
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["{weather}"] = "N/A",
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["{tempf}"] = "N/A",
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["{tempc}"] = "N/A",
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["{humid}"] = "N/A",
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["{press}"] = "N/A"
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}
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-- Check if there was a timeout or a problem with the station
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if ws == nil then
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return weather
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else
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weather["{city}"] = -- City and/or area
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string.match(ws, "^(.+)%,.*%([%u]+%)") or weather["{city}"]
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weather["{wind}"] = -- Wind direction and degrees if available
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string.match(ws, "Wind:[%s][%a]+[%s][%a]+[%s](.+)[%s]at.+$") or weather["{wind}"]
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weather["{windmph}"] = -- Wind speed in MPH if available
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string.match(ws, "Wind:[%s].+[%s]at[%s]([%d]+)[%s]MPH") or weather["{windmph}"]
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weather["{sky}"] = -- Sky conditions if available
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string.match(ws, "Sky[%s]conditions:[%s](.-)[%c]") or weather["{sky}"]
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weather["{weather}"] = -- Weather conditions if available
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string.match(ws, "Weather:[%s](.-)[%c]") or weather["{weather}"]
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weather["{tempf}"] = -- Temperature in fahrenheit
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string.match(ws, "Temperature:[%s]([%d%.]+).*[%c]") or weather["{tempf}"]
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weather["{tempc}"] = -- Temperature in celsius
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string.match(ws, "Temperature:[%s][%d%.]+[%s]F[%s]%(([%d%.]+)[%s]C%)[%c]") or weather["{tempc}"]
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weather["{humid}"] = -- Relative humidity in percent
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string.match(ws, "Relative[%s]Humidity:[%s]([%d]+)%%") or weather["{humid}"]
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weather["{press}"] = -- Pressure in hPa
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string.match(ws, "Pressure[%s].+%((.+)[%s]hPa%)") or weather["{press}"]
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-- Wind speed in KMH if MPH was available
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if weather["{windmph}"] ~= "N/A" then
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weather["{windkmh}"] = math.floor(weather["{windmph}"] * 1.6)
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end
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end
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return weather
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end
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-- }}}
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setmetatable(_M, { __call = function(_, ...) return worker(...) end })
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