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|
{-# LANGUAGE LambdaCase #-}
module Main
( main
) where
import Control.Monad (when)
import Data.List (intercalate)
import Data.Semigroup ((<>))
import Data.Version (showVersion)
import System.Exit (die)
import System.IO (IOMode(ReadMode), hGetLine, hPrint, stderr, withFile)
import Options.Applicative
( Parser
, (<**>)
, (<|>)
, auto
, execParser
, fullDesc
, header
, help
, helper
, info
, long
, metavar
, option
, optional
, short
, strOption
, switch
)
import System.Directory (createDirectoryIfMissing)
import System.Environment.XDG.BaseDir (getUserConfigDir, getUserConfigFile)
import Paths_openweathermap (version) -- from cabal
import qualified Web.OpenWeatherMap.Client as Client
import qualified Web.OpenWeatherMap.Types.Coord as Coord
import qualified Web.OpenWeatherMap.Types.CurrentWeather as CurrentWeather
import qualified Web.OpenWeatherMap.Types.Main as Main
import qualified Web.OpenWeatherMap.Types.Sys as Sys
import qualified Web.OpenWeatherMap.Types.Weather as Weather
import qualified Web.OpenWeatherMap.Types.Wind as Wind
appName :: String
appName = "openweathermap"
parseLocation :: Parser Client.Location
parseLocation = byName <|> byCoord
where
byName =
Client.Name <$>
strOption (long "city" <> short 'c' <> metavar "CITY" <> help "City name")
byCoord =
Client.Coord <$>
option
auto
(long "lat" <> metavar "NUM" <> help "Latitude in decimal degrees") <*>
option
auto
(long "lon" <> metavar "NUM" <> help "Longitude in decimal degrees")
data ApiKey
= ApiKeyFile FilePath
| ApiKey String
parseApiKey :: Parser ApiKey
parseApiKey = fromFile <|> inCmdLine
where
fromFile =
ApiKeyFile <$>
strOption
(long "api-key-file" <> short 'K' <> metavar "APIKEYFILE" <>
help "Read API key from this file")
inCmdLine =
ApiKey <$>
strOption
(long "api-key" <> short 'k' <> metavar "APIKEY" <> help "API key")
data Config = Config
{ apikey :: Maybe ApiKey
, location :: Client.Location
, debug :: Bool
}
parseConfig :: Parser Config
parseConfig =
Config <$> optional parseApiKey <*> parseLocation <*>
switch (long "debug" <> short 'd' <> help "Enable debug")
getApiKey :: Maybe ApiKey -> IO String
getApiKey (Just (ApiKey key)) = return key
getApiKey (Just (ApiKeyFile f)) = withFile f ReadMode hGetLine
getApiKey Nothing = do
createDirectoryIfMissing True =<< getUserConfigDir appName
getUserConfigFile appName "key" >>= getApiKey . Just . ApiKeyFile
showLocation :: CurrentWeather.CurrentWeather -> String
showLocation w = city ++ maybe "" ("," ++) country ++ " " ++ coords
where
name = CurrentWeather.name w
coord = CurrentWeather.coord w
country = Sys.country . CurrentWeather.sys $ w
city =
if name /= ""
then name
else "<unknown>"
coords =
"(" ++ show (Coord.lat coord) ++ "°, " ++ show (Coord.lon coord) ++ "°)"
showWeather :: [Weather.Weather] -> String
showWeather w = intercalate "," $ Weather.main <$> w
showHumidity :: Main.Main -> String
showHumidity m = "H " ++ show hm ++ " %"
where
hm :: Int
hm = round . Main.humidity $ m
-- https://en.wikipedia.org/wiki/Millimeter_of_mercury
showPressure :: Main.Main -> String
showPressure m = "P " ++ show p ++ " mmHg"
where
hPa2mmHg hpa = hpa * 0.750061561303
p :: Int
p = round . hPa2mmHg . Main.pressure $ m
-- https://stackoverflow.com/q/7490660/933161
showWind :: Wind.Wind -> String
showWind w = dir ++ " " ++ show speed ++ " m/s"
where
speed :: Int
speed = round . Wind.speed $ w
deg = Wind.deg w
-- [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ]
dirs = ["↓", "↙", "←", "↖", "↑", "↗", "→", "↘"]
l = length dirs
sector = round $ (deg * fromIntegral l) / 360.0
dir = dirs !! (sector `rem` l)
showTemp :: Main.Main -> String
showTemp m = "T " ++ temp ++ " °C"
where
k2c k = k - 273.15 -- Kelvin to Celsius
tmax :: Int
tmin :: Int
tmax = round . k2c . Main.temp_max $ m
tmin = round . k2c . Main.temp_min $ m
show' t =
if t > 0
then "+" ++ show t
else show t
temp =
if tmax /= tmin
then show' tmin ++ ".." ++ show' tmax
else show' tmin
printWeather :: CurrentWeather.CurrentWeather -> IO ()
printWeather w = putStrLn out
where
weather = showWeather $ CurrentWeather.weather w
place = showLocation w
mainw = CurrentWeather.main w
wind = CurrentWeather.wind w
out =
place ++
": " ++
intercalate
", "
[ weather
, showHumidity mainw
, showPressure mainw
, showTemp mainw
, showWind wind
]
run :: Config -> IO ()
run cfg = do
appid <- getApiKey . apikey $ cfg
Client.getWeather appid (location cfg) >>= \case
Left err -> die $ show err
Right weather -> do
when (debug cfg) $ hPrint stderr weather
printWeather weather
main :: IO ()
main = run =<< execParser opts
where
opts = info (parseConfig <**> helper) (fullDesc <> header desc)
desc =
"openweathermap " ++
showVersion version ++
" - command-line client for https://openweathermap.org/api"
|
