Module timeline_groups 

Timeline date bucketing — a faithful port of timeline-groups.ts.

Adapts the JS Date-based logic to chrono::Local. ymd takes 1-based year/month/day ints (the JS ymd(new Date(...)) used 0-based months; our API is 1-based and documented). format_date parses an RFC3339 string to local time and formats it as YYYY-MM-DD, returning "" on null/invalid.

Structs

TimelineBucket

A timeline bucket: a label plus the points that fall under it.

Functions

bucket_label

Bucket label for a single point relative to now: "Working tree" for worktree points, else "Today" / "Yesterday" / "Earlier".

format_date

Parse an RFC3339 string, convert to local time, format as YYYY-MM-DD. Returns "" for None or an unparseable value (parity with the JS new Date(value) + ymd, which is local-timezone).

group_timeline

Group points into ordered buckets by label, preserving first-seen order.

ymd

Zero-padded YYYY-MM-DD from 1-based year/month/day.