69 lines
2.2 KiB
Haskell
69 lines
2.2 KiB
Haskell
module GHCup.Bash
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( findAssignment
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, equalsAssignmentWith
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, getRValue
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, getAssignmentValueFor
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)
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where
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import Language.Bash.Parse
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import Language.Bash.Word
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import Language.Bash.Syntax
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import HPath
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import HPath.IO
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import Data.ByteString.UTF8 ( toString )
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import Control.Monad
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import Data.Maybe
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import qualified Data.ByteString.Lazy.UTF8 as UTF8
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import Prelude hiding ( readFile )
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import Data.List
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extractAssignments :: List -> [Assign]
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extractAssignments (List stms) = join $ fmap getAssign $ getCommands stms
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where
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getCommands :: [Statement] -> [Command]
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getCommands = join . fmap commands . catMaybes . fmap findPipes
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where
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findPipes (Statement (Last p@(Pipeline{})) Sequential) = Just p
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findPipes _ = Nothing
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getAssign :: Command -> [Assign]
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getAssign (Command (SimpleCommand ass _) _) = ass
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getAssign _ = []
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-- | Find an assignment matching the predicate in the given file.
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findAssignment :: Path b -> (Assign -> Bool) -> IO (Maybe Assign)
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findAssignment p predicate = do
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fileContents <- readFile p
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-- TODO: this should accept bytestring:
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-- https://github.com/knrafto/language-bash/issues/37
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case parse (toString . toFilePath $ p) (UTF8.toString fileContents) of
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Left e -> fail $ show e
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Right l -> pure $ find predicate (extractAssignments $ l)
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-- | Check that the assignment is of the form Foo= ignoring the
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-- right hand-side.
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equalsAssignmentWith :: String -> Assign -> Bool
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equalsAssignmentWith n ass = case ass of
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(Assign (Parameter name' Nothing) Equals _) -> n == name'
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_ -> False
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-- | This pretty-prints the right hand of an Equals assignment, removing
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-- quotations. No evaluation is performed.
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getRValue :: Assign -> Maybe String
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getRValue ass = case ass of
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(Assign (Parameter _ _) Equals (RValue w)) -> Just $ unquote w
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_ -> Nothing
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-- | Given a bash assignment such as Foo="Bar" in the given file,
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-- will return "Bar" (without quotations).
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getAssignmentValueFor :: Path b -> String -> IO (Maybe String)
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getAssignmentValueFor p n = do
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mass <- findAssignment p (equalsAssignmentWith n)
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pure (mass >>= getRValue)
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