Use FreeAndNil across the board. Even if we are immediately assigning after, probably avoids accidental mistakes. Also free neglected owner tex on shutdown, and delete hog gears using the normal deletion procedure if for any reason they still exist (EndGame call?).
{-# LANGUAGE OverloadedStrings #-}
module Confuse where
import Numeric
import Data.Char
import Control.Monad
import qualified Data.ByteString as B
import qualified Data.ByteString.UTF8 as UTF8
import qualified Data.Map as Map
hx :: [Char] -> String
hx cs = let ch = (chr . fst . last . readHex $ cs) in
case ch of
'\'' -> "''"
'\\' -> "\\\\"
c -> c : []
conv :: String -> B.ByteString
conv s = B.concat ["('", UTF8.fromString i, "', '", UTF8.fromString r, "')"]
where
i :: String
i = hx s
r :: String
r = concatMap hx . words . takeWhile ((/=) ';') . tail $ dropWhile ((/=) '\t') s
convRules :: (B.ByteString, [B.ByteString]) -> B.ByteString
convRules (a, b) = B.concat ["<reset>", u a, "</reset>\n<s>", B.concat $ map u b, "</s>"]
where
u a = B.concat ["\\","u",a]
toPair :: String -> (B.ByteString, [B.ByteString])
toPair s = (UTF8.fromString $ takeWhile isHexDigit s, map UTF8.fromString . words . takeWhile ((/=) ';') . tail $ dropWhile ((/=) '\t') s)
main = do
ll <- liftM (filter (isHexDigit . head) . filter (not . null) . lines) $ readFile "confusables.txt"
B.writeFile "rules.txt" . B.intercalate "\n" . map convRules . Map.toList . Map.fromList . filter notTooLong . filter fits16bit . map toPair $ ll
where
notTooLong = (>) 6 . length . snd
fits16bit (a, b) = let f = (>) 5 . B.length in all f $ a:b