The message engine outlives its substrate — harvested to Kanban/Changes/ as the change narrator

Step 2 of strategy/01-git-excision.md: CommitMessageEngine and the composer seam relocate to a neutral module renamed away from commit vocabulary (ChangeNarrator, ChangeNarrationRequest, ChangeNarrating, SemanticChangeNarration, ChangeAuthorship), GitChangedPath extracts from GitCommitOperation as ChangedPath, and the one git tie severs — authorship's foreign case carries a display name, not a GitIdentity. The spec tests transplant as ChangeNarratorTests, alive until the journal work begins. 3,009 tests green.

Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy
This commit is contained in:
2026-08-08 10:38:43 -04:00
parent 6d1872ad8b
commit ae7be98eaa
8 changed files with 207 additions and 182 deletions
+32 -30
View File
@@ -130,7 +130,7 @@ public final class GitAutoCommitter {
/// (06 Commit messages). Settable so a test can inject a fake and assert *that* a message was
/// asked for without asserting what it said.
@ObservationIgnored
public var composer: any CommitMessageComposing = SemanticCommitMessage()
public var composer: any ChangeNarrating = SemanticChangeNarration()
/// The board as the app last read it, for the composer's "current" half. `nil` where no store is
/// attached, which is every storeless test.
@@ -676,7 +676,7 @@ public final class GitAutoCommitter {
let boardRoot: URL
let excludedFolders: [String]
let receipts: [String: HarvestedReceipt]
let composer: any CommitMessageComposing
let composer: any ChangeNarrating
let snapshot: BoardModel?
}
@@ -740,7 +740,7 @@ public final class GitAutoCommitter {
/// Once per *flush*, not once per planned commit: a window that splits three ways
/// (foreign heal user) composes all three messages against the same HEAD, so materializing
/// HEAD's tree three times would be three answers to one question. Each message is then narrowed
/// to its own commit by `CommitMessageRequest.changedPaths`, which the split already narrows.
/// to its own commit by `ChangeNarrationRequest.changedPaths`, which the split already narrows.
private struct Composition: Sendable {
var previous: BoardModel?
var current: BoardModel?
@@ -749,13 +749,13 @@ public final class GitAutoCommitter {
}
/// Reads the two snapshots and the guide's bytes the only impure step in the message path, kept
/// here so `CommitMessageEngine` can be a pure function of values.
/// here so `ChangeNarrator` can be a pure function of values.
///
/// **Skipped entirely when nothing in the window could touch the model**, which is the ordinary
/// stray-only and guide-only window: those compose path-shaped events, and materializing a board
/// twice to describe a changed `.gitignore` would be work with no reader.
private nonisolated static func composition(
for changed: [GitChangedPath],
for changed: [ChangedPath],
input: FlushInput
) -> Composition {
var composition = Composition()
@@ -769,7 +769,7 @@ public final class GitAutoCommitter {
// entirely (01-storage-format.md § Enhanced schema), so HEAD's tree has nothing to say about
// them but the verbs name the *card* ("Comment on 'Fix login'"), and only a board knows a
// card's title. So a comment-only window loads the current board and skips the materialization.
let touchesModel = changed.contains { CommitMessageEngine.Paths.mightAffectSnapshot($0.path) }
let touchesModel = changed.contains { ChangeNarrator.Paths.mightAffectSnapshot($0.path) }
let namesACard = changed.contains { CommentPath.classify($0.path) != nil }
// **The chronology the bullets sort by** (06 Rules Auto-commit, blessed 2026-07-31) the
// one field of a comment the composer needs and the board snapshot cannot carry. Read beside
@@ -791,7 +791,7 @@ public final class GitAutoCommitter {
}
/// **When each comment this window touched was created**, keyed by its folder the chronology
/// `CommitMessageEngine` sorts a commit's comment bullets by (06 Rules Auto-commit, blessed
/// `ChangeNarrator` sorts a commit's comment bullets by (06 Rules Auto-commit, blessed
/// 2026-07-31: "by the comments' own `created`, folder name on ties").
///
/// One `index.md` per touched comment folder, read off the **working tree** which is the state
@@ -806,13 +806,13 @@ public final class GitAutoCommitter {
/// way a flush does, instead of hand-assembling a map the flush could never produce
/// (`WriterFixture.snapshot()`'s reason, restated one field down).
nonisolated static func commentTimestamps(
for changed: [GitChangedPath],
for changed: [ChangedPath],
boardRoot: URL
) -> [String: Date] {
var timestamps: [String: Date] = [:]
var seen: Set<String> = []
for path in changed {
guard let folder = CommitMessageEngine.commentFolder(of: path.path), seen.insert(folder).inserted
guard let folder = ChangeNarrator.commentFolder(of: path.path), seen.insert(folder).inserted
else { continue }
let index = boardRoot
.appendingPathComponent(folder)
@@ -828,7 +828,7 @@ public final class GitAutoCommitter {
/// The three-way split turned into commits or, on an unborn HEAD, the one commit 06 fixes.
private nonisolated static func plan(
_ changed: [GitChangedPath],
_ changed: [ChangedPath],
reading: GitRepositoryReading,
input: FlushInput,
composition: Composition
@@ -836,11 +836,11 @@ public final class GitAutoCommitter {
let user = GitCommitOperation.userIdentity(at: input.boardRoot)
func request(
_ paths: [GitChangedPath],
_ authorship: CommitAuthorship,
_ paths: [ChangedPath],
_ authorship: ChangeAuthorship,
isRootCommit: Bool = false
) -> CommitMessageRequest {
CommitMessageRequest(
) -> ChangeNarrationRequest {
ChangeNarrationRequest(
boardRoot: input.boardRoot,
changedPaths: paths,
authorship: authorship,
@@ -862,7 +862,7 @@ public final class GitAutoCommitter {
guard !reading.isUnborn else {
return [PlannedCommit(
paths: changed.map(\.path),
message: input.composer.message(for: request(changed, .user, isRootCommit: true)),
message: input.composer.narrative(for: request(changed, .user, isRootCommit: true)),
author: user,
committer: user,
kind: .root
@@ -871,28 +871,28 @@ public final class GitAutoCommitter {
let split = CommitAttribution.split(changed, under: input.boardRoot, receipts: input.receipts)
return split.ordered.map { group in
let authorship: CommitAuthorship
// One combined switch over `group.kind`, producing both `authorship` (what the message
// seam is allowed to know) and `author` (who the commit is actually by) the foreign
// branch resolves the identity once and both derive from it.
let authorship: ChangeAuthorship
let author: GitIdentity
switch group.kind {
case .foreign:
authorship = .foreign(
CommitAttribution.foreignIdentity(for: group.paths, under: input.boardRoot)
)
let identity = CommitAttribution.foreignIdentity(for: group.paths, under: input.boardRoot)
authorship = .foreign(identity.name)
author = identity
// **A heal is authored `Lanework Integrity <integrity@lanework.invalid>`** (06 Commit
// messages Healing mutations commit separately, ruled 2026-07-31): "a heal is a third
// origin not the user's gesture, not a foreign writer and the separation exists for
// audit, so the trail filters by author like every origin". This authored heals as the
// *user* until that ruling, which left the separate commit filterable only by message
// shape and the shape vocabulary deliberately never says "healed".
case .heal: authorship = .heal
case .user: authorship = .user
}
// The committer stays the user throughout 06's recorded-by convention, which is why
// only the author varies here.
let author: GitIdentity
switch authorship {
case let .foreign(identity): author = identity
case .heal: author = CommitAttribution.integrityIdentity
case .user: author = user
case .heal:
authorship = .heal
author = CommitAttribution.integrityIdentity
case .user:
authorship = .user
author = user
}
let kind: PlannedCommitKind
switch group.kind {
@@ -900,9 +900,11 @@ public final class GitAutoCommitter {
case .heal: kind = .heal
case .user: kind = .user
}
// The committer stays the user throughout 06's recorded-by convention, which is why
// only the author varies above.
return PlannedCommit(
paths: group.paths.map(\.path),
message: input.composer.message(for: request(group.paths, authorship)),
message: input.composer.narrative(for: request(group.paths, authorship)),
author: author,
committer: user,
kind: kind