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{- file globbing
-
- This uses TDFA when available, with a fallback to regex-compat.
- TDFA is less buggy in its support for non-unicode characters.
-
- Copyright 2014 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Utility.Glob (
Glob,
GlobCase(..),
compileGlob,
matchGlob
) where
import System.Path.WildMatch
#ifdef WITH_TDFA
import Text.Regex.TDFA
import Text.Regex.TDFA.String
#else
import Text.Regex
import Data.Maybe
#endif
newtype Glob = Glob Regex
data GlobCase = CaseSensative | CaseInsensative
{- Compiles a glob to a regex, that can be repeatedly used. -}
compileGlob :: String -> GlobCase -> Glob
compileGlob glob globcase = Glob $
#ifdef WITH_TDFA
case compile (defaultCompOpt {caseSensitive = casesentitive}) defaultExecOpt regex of
Right r -> r
Left _ -> error $ "failed to compile regex: " ++ regex
#else
mkRegexWithOpts regex casesentitive True
#endif
where
regex = '^':wildToRegex glob
casesentitive = case globcase of
CaseSensative -> True
CaseInsensative -> False
matchGlob :: Glob -> String -> Bool
matchGlob (Glob regex) val =
#ifdef WITH_TDFA
case execute regex val of
Right (Just _) -> True
_ -> False
#else
isJust $ matchRegex regex val
#endif
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