98 lines
2.3 KiB
Idris
98 lines
2.3 KiB
Idris
module Quox.Parser.LoadFile
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import Quox.Loc
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import Quox.EffExtra
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import Data.IORef
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import Data.SortedSet
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import System.File
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import System.Path
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%default total
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public export
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FilePath : Type
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FilePath = String
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public export
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data LoadFileL : (lbl : k) -> Type -> Type where
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[search lbl]
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Seen : FilePath -> LoadFileL lbl Bool
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SetSeen : FilePath -> LoadFileL lbl ()
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DoLoad : Loc -> FilePath -> LoadFileL lbl String
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public export
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LoadFile : Type -> Type
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LoadFile = LoadFileL ()
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export
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seenAt : (0 lbl : k) -> Has (LoadFileL lbl) fs => FilePath -> Eff fs Bool
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seenAt lbl file = send $ Seen {lbl} file
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export %inline
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seen : Has LoadFile fs => FilePath -> Eff fs Bool
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seen = seenAt ()
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export
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setSeenAt : (0 lbl : k) -> Has (LoadFileL lbl) fs => FilePath -> Eff fs ()
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setSeenAt lbl file = send $ SetSeen {lbl} file
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export %inline
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setSeen : Has LoadFile fs => FilePath -> Eff fs ()
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setSeen = setSeenAt ()
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export
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doLoadAt : (0 lbl : k) -> Has (LoadFileL lbl) fs =>
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Loc -> FilePath -> Eff fs String
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doLoadAt lbl loc file = send $ DoLoad {lbl} loc file
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export %inline
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doLoad : Has LoadFile fs => Loc -> FilePath -> Eff fs String
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doLoad = doLoadAt ()
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public export
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SeenSet : Type
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SeenSet = SortedSet FilePath
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public export
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IncludePath : Type
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IncludePath = List String
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public export
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ErrorWrapper : Type -> Type
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ErrorWrapper e = Loc -> FilePath -> FileError -> e
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export covering
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readFileFrom : HasIO io => IncludePath -> FilePath ->
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io (Either FileError String)
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readFileFrom inc f =
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case !(firstExists $ map (</> f) inc) of
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Just path => readFile path
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Nothing => pure $ Left $ FileNotFound
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export covering
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handleLoadFileIOE : ErrorWrapper e ->
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IORef SeenSet -> IncludePath ->
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LoadFileL lbl a -> IOErr e a
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handleLoadFileIOE inj seen inc = \case
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Seen f => contains f <$> readIORef seen
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SetSeen f => modifyIORef seen $ insert f
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DoLoad l f => readFileFrom inc f >>= either (ioLeft . inj l f) pure
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export
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loadFileAt : (0 lbl : k) -> Has (LoadFileL lbl) fs =>
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Loc -> FilePath -> Eff fs (Maybe String)
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loadFileAt lbl loc file =
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if !(seenAt lbl file)
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then pure Nothing
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else Just <$> doLoadAt lbl loc file <* setSeenAt lbl file
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export
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loadFile : Has LoadFile fs => Loc -> FilePath -> Eff fs (Maybe String)
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loadFile = loadFileAt ()
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