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Fix file encoding problems with non-UTF-8 locales #7

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Fix file encoding problems with non-UTF-8 locales #7

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11 changes: 10 additions & 1 deletion src/Language/Haskell/Extract.hs
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Expand Up @@ -6,11 +6,20 @@ module Language.Haskell.Extract (
import Language.Haskell.TH
import Text.Regex.Posix
import Data.List
import System.IO

extractAllFunctions :: String -> Q [String]
extractAllFunctions pattern =
do loc <- location
file <- runIO $ readFile $ loc_filename loc
file <- runIO $ do
h <- openFile (loc_filename loc) ReadMode
-- Haskell programs are usually written in UTF-8, but the default file
-- encoding is determined by locale and may be different (e.g. CP932 encoding
-- is used on Japanese Windows environment).
-- To avoid "hGetContents: invalid argument (invalid byte sequence)" error
-- on such cases, we explicitly specify file encoding as UTF-8.
hSetEncoding h =<< mkTextEncoding "UTF-8//IGNORE"
hGetContents h
return $ nub $ filter (=~pattern) $ map fst $ concat $ map lex $ lines file

-- | Extract the names and functions from the module where this function is called.
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