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Overview
Comment:feat(history): render a horizon boundary as the horizon

A parent the origin labelled below a structural horizon is the horizon itself (draft-fossil-horizon-00 5.4), but the history views showed it as a bare parent hash, and the ancestry walk tried to read an event for it.

LogEntry and TimelineEntry gain HorizonParents, the subset of Parents that carries a boundary label; Ancestry ends at such a parent without an error; repo timeline prints it as "parent: <hash> (horizon)". An absent parent that is not labelled is transit and renders as before.

Timelines: family | ancestors | descendants | both | trunk | feat/horizon-cones
Files: files | file ages | folders
SHA3-256: ee3ccc7c670ecc8f20a1e011c1db856ba1c2b4edf72f0dff996bfed8138849e4
User & Date: [email protected] on 2026-10-22 17:21:12.000
Other Links: branch diff | manifest | tags
Context
2026-10-22
17:21
Merge branch 'wip/horizon-render' into feat/horizon-cones

History views render a labelled horizon boundary as the horizon (draft-fossil-horizon-00 §5.4): Repo.Ancestry ends there without an error, Repo.Timeline and LogEntry report it in HorizonParents, and repo timeline prints it as (horizon). An unlabelled absent parent renders as before. check-in: d0c44dbc25 user: [email protected] tags: feat/horizon-cones, trunk

17:21
feat(history): render a horizon boundary as the horizon

A parent the origin labelled below a structural horizon is the horizon itself (draft-fossil-horizon-00 5.4), but the history views showed it as a bare parent hash, and the ancestry walk tried to read an event for it.

LogEntry and TimelineEntry gain HorizonParents, the subset of Parents that carries a boundary label; Ancestry ends at such a parent without an error; repo timeline prints it as "parent: <hash> (horizon)". An absent parent that is not labelled is transit and renders as before. check-in: ee3ccc7c67 user: [email protected] tags: feat/horizon-cones, trunk

17:02
docs: the structural horizon in the changelog and the sparse page check-in: 43d6d7f88b user: [email protected] tags: feat/horizon-cones, trunk
Changes
Unified Diff Side-by-Side Diff Patch
Modified cli/repo_timeline.go from [d52015697a] to [549bab84e2]. [diff]
Added cli/repo_timeline_horizon_test.go version [c7e6cf3edd].
Modified conformance/horizon_structural_test.go from [8f72fb17cb] to [f3631ab786]. [diff]
Modified conformance/requirements/horizon.tsv from [3fa6bd72da] to [94b01d7202]. [diff]
Added horizon_history_test.go version [56f110b70f].
Modified internal/manifest/log.go from [a7643f9cd7] to [5f67d258bf]. [diff]
Modified internal/manifest/timeline.go from [6b656dc359] to [433889a593]. [diff]
Modified repo_checkout.go from [f09f304204] to [40b47e5df3]. [diff]
Modified repo_history.go from [a04d61b480] to [3caf948166]. [diff]