Live log

Model and live logic: createLogTailModel.ts, log-tail-controller.ts.

A rolling log file like tail -f: up to 5,000 new lines per second, one million lines at most. Select a line, press ↓ or Shift+↓ – the selection stays at its line while the lines keep coming, and every click arrives, even while the table renders under the mouse pointer. MIT-licensed, no dependencies.

const result = tableApi.appendRows(lines, {
  follow: frozen ? false : "auto",   // "auto": at the end → stay at the end ("tail -f")
  maxRows: 1_000_000                 // ring buffer: the oldest lines leave
});
if (result && !result.following) newBelow += result.shown;   // "+N new lines"

Freeze scroll: follow: false – the view stays where it is, even at the end; lines keep coming.
Scroll to end: tableApi.repaintHard({ py: Number.MAX_SAFE_INTEGER }) and follow: "auto" again – it follows also when you scroll to the end yourself.
Pause intake: the app collects the lines and appends them as one block later – one call, one render.
Cost: O(k) for k new lines (in place, no copy); a filter runs only for the new lines, a sort order merges them in. If only lines below the visible ones come in, no cell is rebuilt.
Own data structure: tableApi.rowsAppended(count, { removedAtStart }) after your area model appended.

Docs: instructions.md 6.9 · API: TableApi.appendRows, TableApi.rowsAppended.