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|
{-# LANGUAGE OverloadedStrings #-}
module Config
( configUsage
, Config(..)
, getConfig
) where
import Data.Maybe (catMaybes, isJust)
import Data.Map (Map)
import qualified Data.Map as M
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.IO as T
import Control.Monad (guard)
import System.Directory (doesFileExist)
import Model.URL
import Utils.Text
configUsage :: Text
configUsage =
T.intercalate "\n"
[ ""
, T.concat
[ " Some information is required in the file `"
, T.pack configPath
, "`:"
]
, ""
, " - url (required)"
, " - mailTo (optional)"
, ""
, " Example:"
, ""
, " # The url field is required"
, " url = http://www.leboncoin.fr/locations/offres/ile_de_france/?f=a&th=1"
, ""
, " # The mailTo field is an optional list"
, " # mailTo = jean.dupont@mail.fr, john.smith@mail.com"
]
configPath :: FilePath
configPath = "conf"
data Config = Config
{ url :: URL
, mailTo :: Maybe [Text]
} deriving (Eq, Read, Show)
getConfig :: IO (Maybe Config)
getConfig = do
exists <- doesFileExist configPath
if exists
then
configFromFile <$> T.readFile configPath
else
return Nothing
configFromFile :: Text -> Maybe Config
configFromFile =
configFromMap
. M.fromList
. catMaybes
. map lineConfig
. filter (not . T.null)
. filter (not . startsWith "#")
. map T.strip
. T.lines
configFromMap :: Map Text Text -> Maybe Config
configFromMap map = do
url <- M.lookup "url" map
let mailTo = T.splitOn "," <$> M.lookup "mailTo" map
return $ Config { url = url, mailTo = mailTo }
lineConfig :: Text -> Maybe (Text, Text)
lineConfig line = do
(key, value) <- keyValue line
guard (T.length key > 0)
return (key, value)
keyValue :: Text -> Maybe (Text, Text)
keyValue line =
let sep = '='
in if isJust (T.find (== sep) line)
then
let key = T.takeWhile (/= sep) line
value = T.drop 1 . T.dropWhile (/= sep) $ line
in Just (T.strip key, T.strip value)
else
Nothing
|
