SimpleConfig.hs for parsing key/path associations

1 files changed, 36 insertions, 0 deletions

diff --git a/SimpleConfig.hs b/SimpleConfig.hs
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index 0000000..9ffe7b1
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+++ b/SimpleConfig.hs
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+module SimpleConfig where
+
+import qualified Data.Map as Map
+import Data.Map ( Map )
+import Data.Char
+import Data.List
+import Data.Maybe
+import Control.Monad
+
+newtype SimpleConfig = SimpleConfig
+    { configMap :: Map String (Map String String)
+    }
+ deriving (Eq,Show)
+
+load :: FilePath -> IO SimpleConfig
+load path = parse `fmap` readFile path
+
+parse :: String -> SimpleConfig
+parse txt = SimpleConfig $ Map.fromList ss
+ where
+    ls = lines txt
+    cs = filter (not . null) $ map (takeWhile (/='#')) ls
+    css = groupBy (\_ s -> take 1 s /= "[") cs
+    ss = mapMaybe (\ds -> do
+                        brkt <- listToMaybe $ take 1 ds
+                        opn <- listToMaybe $ take 1 brkt
+                        guard $ opn == '['
+                        let sec = init (drop 1 brkt)
+                        return (sec, Map.fromList $ map parseItem $ drop 1 ds)
+                    )
+                  css
+
+parseItem txt = (key,val)
+ where
+    (key,rst) = span (not . isSpace) $ dropWhile isSpace txt
+    val = dropWhile isSpace rst