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{- git-annex deferred parse values
-
- Copyright 2015 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE FlexibleInstances #-}
module Types.DeferredParse where
import Annex
import Common
import Options.Applicative
-- Some values cannot be fully parsed without performing an action.
-- The action may be expensive, so it's best to call finishParse on such a
-- value before using getParsed repeatedly.
data DeferredParse a = DeferredParse (Annex a) | ReadyParse a
class DeferredParseClass a where
finishParse :: a -> Annex a
getParsed :: DeferredParse a -> Annex a
getParsed (DeferredParse a) = a
getParsed (ReadyParse a) = pure a
instance DeferredParseClass (DeferredParse a) where
finishParse (DeferredParse a) = ReadyParse <$> a
finishParse (ReadyParse a) = pure (ReadyParse a)
instance DeferredParseClass (Maybe (DeferredParse a)) where
finishParse Nothing = pure Nothing
finishParse (Just v) = Just <$> finishParse v
instance DeferredParseClass [DeferredParse a] where
finishParse v = mapM finishParse v
-- Use when the Annex action modifies Annex state.
type GlobalSetter = DeferredParse ()
globalFlag :: Annex () -> Mod FlagFields GlobalSetter -> Parser GlobalSetter
globalFlag setter = flag' (DeferredParse setter)
globalSetter :: (v -> Annex ()) -> Parser v -> Parser GlobalSetter
globalSetter setter parser = DeferredParse . setter <$> parser
globalSetters :: [Parser GlobalSetter] -> Parser GlobalSetter
globalSetters l = DeferredParse . sequence_ . map getParsed
<$> many (foldl1 (<|>) l)
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