TickedProgress class

A progress line whose spinner is driven from a sidecar isolate.

mason_logger's own Progress animates with a Timer.periodic on the isolate that created it. Generation saturates that isolate — RoutesHandler .parse resolves every unit through the analyzer synchronously between awaits — so the timer never fires and the line stops on whatever frame it last drew. The work is progressing; the only thing that stalled is the thing telling the user so.

Moving the timer off that isolate is the whole point: the sidecar is doing nothing but painting, so it keeps painting no matter what main is stuck in.

Ported from TickedProgress in Morgan's import_ozempic, written for this same symptom. Adapted in two places, both load-bearing here and not there:

the non-animated fallback reproduces mason_logger's output byte for byte rather than printing a plain line — see _paintStatic;
whether to animate and whether to emit ANSI are separate questions, so a caller can animate onto a pipe without pretending it is a terminal.

One caveat the sidecar buys: main and the sidecar write to the same stdout without a lock, so anything main prints during a step (only logger.detail, under --verbose) can interleave with a frame. On a terminal the next frame repaints over it.

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ticked_progress library