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66 lines
2.6 KiB
Haskell
66 lines
2.6 KiB
Haskell
{-# LANGUAGE PartialTypeSignatures #-}
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module Stackage.Snapshot.Diff
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( getSnapshotDiff
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, snapshotDiff
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, SnapshotDiff()
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, toDiffList
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, VersionChange(..)
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, WithSnapshotNames(..)
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) where
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import Data.Align
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import Data.Aeson.Extra
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import qualified Data.HashMap.Strict as HashMap
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import Control.Arrow
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import ClassyPrelude
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import Data.These
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import Stackage.Database (SnapshotId, PackageListingInfo(..),
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GetStackageDatabase, getPackages)
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import Stackage.Database.Types (SnapName)
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import Types
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import Web.PathPieces
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data WithSnapshotNames a
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= WithSnapshotNames SnapName SnapName a
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newtype SnapshotDiff
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= SnapshotDiff { unSnapshotDiff :: HashMap PackageName VersionChange }
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deriving (Show, Eq, Generic, Typeable)
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instance ToJSON (WithSnapshotNames SnapshotDiff) where
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toJSON (WithSnapshotNames nameA nameB (SnapshotDiff diff)) =
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object [ "comparing" .= [toPathPiece nameA, toPathPiece nameB]
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, "diff" .= Object (toJSONMap (WithSnapshotNames nameA nameB <$> diff))
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]
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toDiffList :: SnapshotDiff -> [(PackageName, VersionChange)]
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toDiffList = sortOn (toCaseFold . unPackageName . fst) . HashMap.toList . unSnapshotDiff
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-- | Versions of a package as it occurs in the listings provided to `snapshotDiff`.
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--
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-- Would be represented with `These v1 v2` if the package is present in both listings,
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-- otherwise it would be `This v1` if the package is present only in the first listing,
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-- or `That v2` if only in the second.
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newtype VersionChange = VersionChange { unVersionChange :: These Version Version }
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deriving (Show, Eq, Generic, Typeable)
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instance ToJSON (WithSnapshotNames VersionChange) where
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toJSON (WithSnapshotNames (toJSONKey -> aKey) (toJSONKey -> bKey) change) =
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case change of
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VersionChange (This a) -> object [ aKey .= a ]
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VersionChange (That b) -> object [ bKey .= b ]
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VersionChange (These a b) -> object [ aKey .= a, bKey .= b ]
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changed :: VersionChange -> Bool
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changed = these (const True) (const True) (/=) . unVersionChange
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getSnapshotDiff :: GetStackageDatabase m => SnapshotId -> SnapshotId -> m SnapshotDiff
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getSnapshotDiff a b = snapshotDiff <$> getPackages a <*> getPackages b
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snapshotDiff :: [PackageListingInfo] -> [PackageListingInfo] -> SnapshotDiff
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snapshotDiff as bs =
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SnapshotDiff $ HashMap.filter changed
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$ alignWith VersionChange (toMap as) (toMap bs)
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where
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toMap = HashMap.fromList . map (PackageName . pliName &&& Version . pliVersion)
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