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module Main where
import Text.ParserCombinators.Parsec
import System.Environment
import System.Process
import System.Exit
import System.IO
data Config =
Config { weatherNormal :: Integer
, weatherNormalColor :: String
, weatherCritical :: Integer
, weatherCriticalColor :: String
}
defaultConfig :: Config
defaultConfig =
Config { weatherNormal = 0
, weatherNormalColor = "#00FF00"
, weatherCritical = 50
, weatherCriticalColor = "#FF0000"
}
config :: Config
config = defaultConfig
data WeatherInfo = Fail String
| WI { station :: String
, time :: String
, temperature :: Int
, humidity :: Int
}
instance Show WeatherInfo where
show (Fail _) = "N/A"
show (WI st t temp rh) =
st ++ ": " ++ (formatWeather temp) ++ "C, rh " ++ formatWeather rh ++
"% (" ++ t ++ ")"
parseData :: Parser WeatherInfo
parseData =
do { st <- manyTill anyChar $ char '('
; pNL
; manyTill anyChar $ char '/'
; space
; t <- manyTill anyChar newline
; manyTill pNL (string "Temperature")
; temp <- pTemp
; manyTill pNL (string "Relative Humidity")
; rh <- pRh
; manyTill pNL eof
; return $ WI st t temp rh
}
pTemp :: Parser Int
pTemp = do string ": "
manyTill anyChar $ char '('
s <- manyTill digit $ (char ' ' <|> char '.')
pNL
return $read s
pRh :: Parser Int
pRh = do string ": "
s <- manyTill digit $ (char '%' <|> char '.')
return $read s
pNL :: Parser Char
pNL = do many $ noneOf "\n\r"
newline
runP :: Parser WeatherInfo -> String -> IO WeatherInfo
runP p i =
do case (parse p "" i) of
Left err -> return $ Fail $ show err
Right x -> return x
formatWeather :: Int -> String
formatWeather d | d > fromInteger (weatherCritical config) = setColor str weatherCriticalColor
| d > fromInteger (weatherNormal config) = setColor str weatherNormalColor
| otherwise = str
where str = show d
setColor :: String -> (Config -> String) -> String
setColor str ty =
"<fc=" ++ ty config ++ ">" ++
str ++ "</fc>"
defUrl :: String
defUrl = "http://weather.noaa.gov/pub/data/observations/metar/decoded/"
getData :: String -> IO String
getData url=
do (i,o,e,p) <- runInteractiveCommand ("curl " ++ defUrl ++ url ++ ".TXT")
exit <- waitForProcess p
let closeHandles = do hClose o
hClose i
hClose e
case exit of
ExitSuccess -> do str <- hGetContents o
return str
_ -> do closeHandles
return "Could not retrieve data"
main :: IO ()
main =
do args <- getArgs
str <- if length args /= 1
then error $ "No Station ID specified.\nUsage: weather STATION_ID" ++
"\nExample: xmb-weather LIPB"
else getData (args !! 0)
i <- runP parseData str
putStrLn $ show i
|
