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33 lines
1.1 KiB
Haskell
33 lines
1.1 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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, VersionChange(..)
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) where
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import qualified Data.HashMap.Strict as HashMap
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import Data.Align
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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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type PackageName = Text
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type Version = Text
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type SnapshotDiff = HashMap PackageName VersionChange
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newtype VersionChange = VersionChange { unVersionChange :: These Version Version }
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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 = HashMap.filter changed $ alignWith VersionChange (toMap as) (toMap bs)
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where
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toMap = HashMap.fromList . map (pliName &&& pliVersion)
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