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Build branch switching and the popover git surface

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GitBranchSwitcher holds 06's sequence as one object: settle editors
explicitly (SessionSettleGate — Save All applies raw buffers with
validation and a refused buffer cancels the whole switch; Discard
reverts buffers AND reconciles the session folders against HEAD;
never silent), flush the pending auto-commit, stamp intent in the
per-board registry, bracketed safe checkout (git_checkout_tree
GIT_CHECKOUT_SAFE + set_head — no path passes FORCE, abort
included), one reload via the async wholesale bracket (failed final
reload engages the existing read-only lock), reseed undo/redo from
the new HEAD with redo empty, clear the stamp. Create-and-switch
keeps the full sequence — the tree-cannot-change proof fails under
concurrent writers. Lock contention shows the 02 in-progress row's
waiting state ("waiting for another writer's git lock"), bounded at
30s then failing cleanly naming the lock path.

GitOperationStamp + GitOperationRecovery: the own-leftovers rule as
a pure conjunction — pause state AND matching stamp = the app's own
interrupted operation, aborted to the pre-operation state with a
banner, stamp cleared on success only; either alone defers to the
pause-and-defer stance. Checked where the committer starts.

BoardGitControls replaces the read-only branch line: branch picker,
inline create-and-switch, the abnormal-state pause note in 06's own
words with controls dimmed, and commit-identity fields that read and
write repo-local .git/config (derived default as placeholder, never
value; unfocused resync, focused keystrokes kept; 2s poll while
visible — .git is watcher-filtered by design).

Also fixes a shipped bug from the undo card: plan(reconciling:)
matched card ids as path prefixes, so the reconcile branch was inert
on every board (<lane>/<card> never matches a bare id) — a session
file the restore diff couldn't name (attachment, comment, draft)
survived Discard and landed in the next flush's commit. One shared
component-exact folder-name resolver now serves both Discard paths;
noteDiscarded takes cardFolderName; regression test verified failing
against the pre-fix code.

41 branch tests + the regression; 2374 tests / 409 suites green;
InertGitTests untouched.

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
This commit is contained in:
rzen
2026-07-31 16:41:14 -04:00
parent 142c6e75fe
commit 1f7d84bf64
18 changed files with 3045 additions and 75 deletions
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Kanban/App/AppModel.swift
+98 -8
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@@ -880,9 +880,90 @@ public final class AppModel {
}
provider.settleSessions = { [weak self, weak provider] paths in
guard let self, let provider else { return .proceed }
return await self.settleGate(for: ref, provider: provider).settle(touching: paths)
let gate = self.settleGate(for: ref) { [weak provider] folder in
// The card's uncommitted on-disk saves are reverted by the restore itself, which
// compares this folder against the working tree rather than against HEAD — see
// `GitRestoreOperation.plan`.
provider?.noteDiscarded(cardFolderName: folder)
}
return await gate.settle(touching: paths)
}
provider.seed()
wireBranchSwitching(git: git, store: store, provider: provider, ref: ref)
}
/// **The branch controls' seams** (06-history-undo.md ▸ Branch switching) — the five things the
/// switch's sequence needs that a repository cannot supply, plus the per-board stamp that makes an
/// interrupted switch recognizable as this app's.
///
/// Wired beside the undo provider's rather than in a place of its own, because the two are the
/// same board's git session seen from two sides — and because both must be re-wired on exactly the
/// same event, add-git's commanded mid-session flip (`bindHistoryProvider(for:)`).
private func wireBranchSwitching(
git: HistoryStore,
store: BoardStore,
provider: GitHistoryProvider,
ref: BoardWindowRef
) {
guard let switcher = git.switcher else { return }
let recordID = sessions[ref]?.recordID
switcher.flushPendingCommit = { [weak git] in await git?.committer?.flushNow() }
switcher.isHeld = { [weak git] in git?.committer?.pause != nil }
switcher.suspendCommitting = { [weak git] in git?.committer?.stop() }
switcher.resumeCommitting = { [weak git] in git?.committer?.start() }
// **The undo/redo reseed** — the provider's own API, which is the relaunch reseed by
// construction: "discarded and reseeded from the new HEAD's first-parent ancestry … redo
// starts empty".
switcher.reseedUndo = { [weak provider] in await provider?.reseed() }
switcher.didSwitch = { [weak git] in await git?.refreshBranch() }
switcher.runBracketed = { [weak store] announcement, work in
guard let store else { return await work() }
try? await store.performWholesale(announcing: announcement) { await work() }
}
switcher.beginProgress = { [weak store] label in
store?.banners.beginOperation(label: label) ?? UUID()
}
switcher.updateProgress = { [weak store] id, label in
store?.banners.updateOperation(id, label: label)
}
switcher.endProgress = { [weak store] id in store?.banners.endOperation(id) }
// The loss row, on `GitHistoryProvider.reportFailure`'s recorded compromise — see it for why
// a git failure cannot be a `OneShotBanner` today.
switcher.reportFailure = { [weak store] failure in
store?.banners.postLoss(failure.description)
}
switcher.reportRecovery = { [weak store] message in
store?.banners.postLoss(message)
}
// **The per-board registry is the stamp's home** (`GitOperationStamp`). A session with no
// record — a store-level test — simply carries no stamp, and recovery then has nothing to
// recognize, which is the honest answer for a board the app has no state for.
switcher.readStamp = { [weak self] in
guard let self, let recordID else { return nil }
return self.boardRegistry.gitOperationStamp(id: recordID)
}
switcher.writeStamp = { [weak self] stamp in
guard let self, let recordID else { return }
self.boardRegistry.setGitOperationStamp(id: recordID, stamp)
}
switcher.settleSessions = { [weak self, weak switcher] in
guard let self, let switcher else { return .proceed }
let gate = self.settleGate(
for: ref,
message: SessionSettleStep.branchSwitchMessage
) { [weak switcher] folder in
switcher?.noteDiscarded(cardFolderName: folder)
}
// Every open session, not the ones a diff reaches — see `SessionSettleGate.settleAll`.
return await gate.settleAll()
}
// **The own-leftovers check, at open** (06 ▸ Rules ▸ Abnormal repo states). Beside the
// committer's start, which is where a pause first becomes knowable, and before anything the
// user does can land on top of a half-finished checkout.
Task { await switcher.recoverInterruptedOperation() }
}
/// **The save-or-discard step for one board**, built from its open card windows
@@ -890,7 +971,19 @@ public final class AppModel {
///
/// Built per ask rather than stored, because its whole content is "which card windows are open
/// right now" — a set that changes under any operation slow enough to need the step at all.
func settleGate(for ref: BoardWindowRef, provider: GitHistoryProvider?) -> SessionSettleGate {
///
/// - Parameters:
/// - message: what the step says it is about. The two callers describe different consequences —
/// a restore changes the cards being edited, a switch replaces them — and 06 gives the step to
/// both without giving either the other's wording.
/// - didDiscard: told each card folder the Discard branch abandoned, so the operation behind the
/// gate can put that folder's uncommitted saves back to HEAD its own way (the restore folds it
/// into its plan; the switch reverts before it flushes).
func settleGate(
for ref: BoardWindowRef,
message: String = SessionSettleStep.message,
didDiscard: @escaping (String) -> Void = { _ in }
) -> SessionSettleGate {
SessionSettleGate(
sessions: { [weak self] in
guard let self, let session = self.sessions[ref] else { return [] }
@@ -902,17 +995,14 @@ public final class AppModel {
cardFolderName: cardRef.cardID,
needsSettling: settlement.needsSettling,
saveAll: settlement.saveAll,
discard: { [weak provider] in
discard: {
settlement.discard()
// The card's uncommitted on-disk saves are reverted by the restore
// itself, which compares this folder against the working tree rather
// than against HEAD — see `GitRestoreOperation.plan`.
provider?.noteDiscarded(cardFolderPath: cardRef.cardID)
didDiscard(cardRef.cardID)
}
)
}
},
ask: { await SessionSettleStep.ask() },
ask: { await SessionSettleStep.ask(message: message) },
focus: { [weak self] id in
guard let self, let session = self.sessions[ref] else { return }
guard let cardRef = session.cardRefs.first(where: { $0.cardID == id }) else { return }