Open Chronology / Tickets / #539 Let a duration end "now", while it is ongoing (#537, stage 1)

#539 Let a duration end "now", while it is ongoing (#537, stage 1)

Status: closed

Owner: nobody

Labels: None

Updated: 6 hours ago

Created: 8 hours ago

Creator: Anonymous

Private: No

Originally created by: athanclark

Stage 1 of [#537]: ongoing durations in the core model and the browser.

What changes

Model. A duration's end may be {"ongoing": true}, meaning the current time. A start cannot be ongoing.
Validation. Only timelines with the Gregorian time display have a "now", so all others refuse ongoing ends. Partial saves carry no settings, so they skip this check.
Resolution. resolveDuration(duration, timeOf, now) gives an ongoing end as max(start, now). Without now it gives a point at the start: the placeholder the persisted trees will hold.
Browser index. TimelineIndex keeps ongoing durations beside its interval tree and resolves them at its clock for each frame. withOngoing and summariesWithOngoing merge them into the window's longest-first ranking, its counts and its collapsed summaries, so the result matches what the tree would give if it could hold them. The server will reuse both in stage 2.
Drawing and dialog.
Bands fade out where "now" is in view, and times read "… – now".
The view redraws every 15 seconds while an ongoing band is shown.
The duration dialog offers Ongoing (until now) for an end.
Server. It refuses ongoing ends with a 400 until stage 2 teaches its SQL window and summary queries about them. The design is in this comment.

test/ongoing-durations.test.mjs covers validation, the "now" mapping, resolution, frames growing with the clock, collapsed summaries, and merging with truncation.
npm test passes apart from contents.test.mjs, which fails locally with git ENOBUFS from untracked worktrees. CI runs it cleanly.
There is no browser test for the dialog yet.

Stage 2: server storage and queries, saved views, and the API and OpenAPI.
Stage 3: the SQLite native store and och-convert. Until then, saving an ongoing duration to a desktop .och file is not supported.

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