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stackage-diff: add a previous diff link

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allowing navigating back to earlier consecutive diffs

Arguably we could also navigate name1 and name2 separately

Thanks to @chreekat for reviewing and improving the code (#340)
This commit is contained in:
Jens Petersen 2025-02-02 23:01:21 +08:00
parent ec5d5e7b92
commit c4c8241fc3
2 changed files with 7 additions and 1 deletions
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3
src/Handler/StackageHome.hs
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@ -53,7 +53,8 @@ instance ToJSON SnapshotInfo where
getStackageDiffR :: SnapName -> SnapName -> Handler TypedContent
getStackageDiffR name1 name2 = track "Handler.StackageHome.getStackageDiffR" $ do
cacheSeconds $ 60 * 60 * 48
Entity sid1 _ <- lookupSnapshot name1 >>= maybe notFound return
Entity sid1 prevSnap <- lookupSnapshot name1 >>= maybe notFound return
mprevprevSnapName <- map snd <$> snapshotBefore (snapshotName prevSnap)
Entity sid2 _ <- lookupSnapshot name2 >>= maybe notFound return
snapDiff <- getSnapshotDiff sid1 sid2
selectRep $ do

5
templates/stackage-diff.hamlet
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@ -1,5 +1,10 @@
<h1>Compare Stackage snapshots
$maybe prevprev <- mprevprevSnapName
<div .snapshot-nav>
<a href=@{StackageDiffR prevprev name1}>
\< previous diff
<div .container .content>
<div .packages>
<table .table>