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|
{- adjusted branch types
-
- Copyright 2016-2020 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
module Types.AdjustedBranch where
data Adjustment
= LinkAdjustment LinkAdjustment
| PresenceAdjustment PresenceAdjustment (Maybe LinkAdjustment)
| LinkPresentAdjustment LinkPresentAdjustment
deriving (Show, Eq)
data LinkAdjustment
= UnlockAdjustment
| LockAdjustment
| FixAdjustment
| UnFixAdjustment
deriving (Show, Eq)
data PresenceAdjustment
= HideMissingAdjustment
| ShowMissingAdjustment
deriving (Show, Eq)
data LinkPresentAdjustment
= UnlockPresentAdjustment
| LockPresentAdjustment
deriving (Show, Eq)
-- Adjustments have to be able to be reversed, so that commits made to the
-- adjusted branch can be reversed to the commit that would have been made
-- without the adjustment and applied to the original branch.
class ReversableAdjustment t where
reverseAdjustment :: t -> t
instance ReversableAdjustment Adjustment where
reverseAdjustment (LinkAdjustment l) =
LinkAdjustment (reverseAdjustment l)
reverseAdjustment (PresenceAdjustment p ml) =
PresenceAdjustment (reverseAdjustment p) (fmap reverseAdjustment ml)
reverseAdjustment (LinkPresentAdjustment l) =
LinkPresentAdjustment (reverseAdjustment l)
instance ReversableAdjustment LinkAdjustment where
reverseAdjustment UnlockAdjustment = LockAdjustment
-- Keep the file locked intentionally when reversing LockAdjustment.
reverseAdjustment LockAdjustment = LockAdjustment
reverseAdjustment FixAdjustment = UnFixAdjustment
reverseAdjustment UnFixAdjustment = FixAdjustment
instance ReversableAdjustment PresenceAdjustment where
reverseAdjustment HideMissingAdjustment = ShowMissingAdjustment
reverseAdjustment ShowMissingAdjustment = HideMissingAdjustment
instance ReversableAdjustment LinkPresentAdjustment where
reverseAdjustment UnlockPresentAdjustment = LockPresentAdjustment
reverseAdjustment LockPresentAdjustment = UnlockPresentAdjustment
adjustmentHidesFiles :: Adjustment -> Bool
adjustmentHidesFiles (PresenceAdjustment HideMissingAdjustment _) = True
adjustmentHidesFiles _ = False
|
