mirror of
https://github.com/commercialhaskell/stackage-server.git
synced 2026-01-12 12:18:29 +01:00
38 lines
1.4 KiB
Haskell
38 lines
1.4 KiB
Haskell
{-# LANGUAGE PartialTypeSignatures #-}
|
|
module Stackage.Snapshot.Diff
|
|
( getSnapshotDiff
|
|
, snapshotDiff
|
|
, SnapshotDiff
|
|
, VersionChange(..)
|
|
) where
|
|
|
|
import qualified Data.HashMap.Strict as HashMap
|
|
import Data.Align
|
|
import Control.Arrow
|
|
import ClassyPrelude
|
|
import Data.These
|
|
import Stackage.Database (SnapshotId, PackageListingInfo(..),
|
|
GetStackageDatabase, getPackages)
|
|
type PackageName = Text
|
|
type Version = Text
|
|
|
|
type SnapshotDiff = HashMap PackageName VersionChange
|
|
|
|
-- | Versions of a package as it occurs in the listings provided to `snapshotDiff`.
|
|
--
|
|
-- Would be represented with `These v1 v2` if the package is present in both listings,
|
|
-- otherwise it would be `This v1` if the package is present only in the first listing,
|
|
-- or `That v2` if only in the second.
|
|
newtype VersionChange = VersionChange { unVersionChange :: These Version Version }
|
|
|
|
changed :: VersionChange -> Bool
|
|
changed = these (const True) (const True) (/=) . unVersionChange
|
|
|
|
getSnapshotDiff :: GetStackageDatabase m => SnapshotId -> SnapshotId -> m SnapshotDiff
|
|
getSnapshotDiff a b = snapshotDiff <$> getPackages a <*> getPackages b
|
|
|
|
snapshotDiff :: [PackageListingInfo] -> [PackageListingInfo] -> SnapshotDiff
|
|
snapshotDiff as bs = HashMap.filter changed $ alignWith VersionChange (toMap as) (toMap bs)
|
|
where
|
|
toMap = HashMap.fromList . map (pliName &&& pliVersion)
|