55 lines
1.5 KiB
Haskell
55 lines
1.5 KiB
Haskell
module List (listModules) where
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import Control.Applicative
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import Data.Char
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import Data.List
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import System.IO
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import System.Process
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----------------------------------------------------------------
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listModules :: IO [String]
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listModules = exposedModules <$> getDump
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getDump :: IO String
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getDump = do
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(_,hout,_,_) <- runInteractiveProcess "ghc-pkg" ["dump"] Nothing Nothing
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hGetContents hout
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exposedModules :: String -> [String]
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exposedModules cs = results
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where
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ls = unfoldLines cs
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ns = values "name: " ls
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ms = values "exposed-modules: " ls
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zs = zip ns ms
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xs = filter (\(nm,_) -> nm `notElem` ["ghc", "ghc-prim", "rts", "integer"]) zs
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ss = map snd xs
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results = filter (\x -> not ("GHC" `isPrefixOf` x)) $ concatMap words ss
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values :: String -> [String] -> [String]
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values tag ls = value
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where
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value = map (drop len) fs
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len = length tag
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fs = filter (tag `isPrefixOf`) ls
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----------------------------------------------------------------
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unfoldLines :: String -> [String]
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unfoldLines xs = self xs
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where
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splitNL = break (== '\n')
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self "" = []
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self s = let (l, s') = splitNL s
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in case s' of
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[] -> [l]
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(_:' ':s'') -> cont s'' l
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(_:s'') -> l : self s''
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cont s a = let (l, s') = splitNL $ dropWhile (== ' ') s
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a' = a ++ " " ++ l
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in case s' of
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[] -> [a']
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(_:' ':s'') -> cont s'' a'
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(_:s'') -> a' : self s''
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