120 lines
4.6 KiB
Lua
120 lines
4.6 KiB
Lua
---------------------------------------------------
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-- Licensed under the GNU General Public License v2
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-- * (c) 2010, Adrian C. <anrxc@sysphere.org>
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---------------------------------------------------
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-- {{{ Grab environment
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local tonumber = tonumber
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local math = { ceil = math.ceil }
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local os = { date = os.date, difftime = os.difftime, time = os.time }
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local string = { match = string.match }
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local spawn = require"vicious.spawn"
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local helpers = require"vicious.helpers"
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-- }}}
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-- Weather: provides weather information for a requested station
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-- vicious.widgets.weather
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local weather_all = {}
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-- copied from http://lua-users.org/wiki/TimeZone
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local function get_timezone_offset()
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local ts = os.time()
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local utcdate = os.date("!*t", ts)
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local localdate = os.date("*t", ts)
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localdate.isdst = false -- this is the trick
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return os.difftime(os.time(localdate), os.time(utcdate))
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end
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-- {{{ Weather widget type
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local function parse(stdout, stderr, exitreason, exitcode)
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-- Initialize function tables
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local _weather = {
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["{city}"] = "N/A",
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["{when}"] = "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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["{dewf}"] = "N/A",
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["{dewc}"] = "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 stdout == '' then return _weather end
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_weather["{city}"] = -- City and/or area
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string.match(stdout, "^(.+)%,.*%([%u]+%)") or _weather["{city}"]
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_weather["{wind}"] = -- Wind direction and degrees if available
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string.match(stdout, "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(stdout, "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(stdout, "Sky[%s]conditions:[%s](.-)[%c]") or _weather["{sky}"]
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_weather["{weather}"] = -- Weather conditions if available
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string.match(stdout, "Weather:[%s](.-)[%c]") or _weather["{weather}"]
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_weather["{tempf}"] = -- Temperature in fahrenheit
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string.match(stdout, "Temperature:[%s]([%-]?[%d%.]+).*[%c]") or _weather["{tempf}"]
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_weather["{dewf}"] = -- Dew Point in fahrenheit
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string.match(stdout, "Dew[%s]Point:[%s]([%-]?[%d%.]+).*[%c]") or _weather["{dewf}"]
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_weather["{humid}"] = -- Relative humidity in percent
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string.match(stdout, "Relative[%s]Humidity:[%s]([%d]+)%%") or _weather["{humid}"]
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_weather["{press}"] = -- Pressure in hPa
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string.match(stdout, "Pressure[%s].+%((.+)[%s]hPa%)") or _weather["{press}"]
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local year, month, day, hour, min =
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string.match(stdout, "(%d%d%d%d).(%d%d).(%d%d) (%d%d)(%d%d) UTC")
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if year ~= nil then
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local utctable = {
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year = year,
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month = month,
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day = day,
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hour = hour,
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min = min,
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}
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_weather["{when}"] = os.time(utctable) + get_timezone_offset()
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end
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-- Wind speed in km/h if MPH was available
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if _weather["{windmph}"] ~= "N/A" then
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_weather["{windmph}"] = tonumber(_weather["{windmph}"])
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_weather["{windkmh}"] = math.ceil(_weather["{windmph}"] * 1.6)
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end -- Temperature in °C if °F was available
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if _weather["{tempf}"] ~= "N/A" then
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_weather["{tempf}"] = tonumber(_weather["{tempf}"])
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_weather["{tempc}"] = math.ceil((_weather["{tempf}"] - 32) * 5/9)
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end -- Dew Point in °C if °F was available
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if _weather["{dewf}"] ~= "N/A" then
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_weather["{dewf}"] = tonumber(_weather["{dewf}"])
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_weather["{dewc}"] = math.ceil((_weather["{dewf}"] - 32) * 5/9)
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end -- Capitalize some stats so they don't look so out of place
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if _weather["{sky}"] ~= "N/A" then
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_weather["{sky}"] = helpers.capitalize(_weather["{sky}"])
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end
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if _weather["{weather}"] ~= "N/A" then
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_weather["{weather}"] = helpers.capitalize(_weather["{weather}"])
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end
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return _weather
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end
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function weather_all.async(format, warg, callback)
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if not warg then return callback{} end
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-- Get weather forceast by the station ICAO code, from:
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-- * US National Oceanic and Atmospheric Administration
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local url = ("https://tgftp.nws.noaa.gov/data/observations/metar/decoded/%s.TXT"):format(warg)
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spawn.easy_async("curl -fs " .. url,
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function (...) callback(parse(...)) end)
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end
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-- }}}
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return helpers.setasyncall(weather_all)
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