Module progress 

Watching a run while it is still running.

The run log is the record and is written either way. This is the shoulder-read: somewhere to send what is happening as it happens, so a screen can show a run in progress instead of a blank pane for the minute it takes.

A watcher is handed a Step and returns nothing. That is the whole guarantee, and it is deliberate: watching cannot become steering, and a watcher that panics or blocks cannot change what the run decides. Sending is the watcher’s problem — the shipped one drops what it cannot deliver, because a run must not stall on a screen that has gone away.

Structs

Channel

A watcher over a channel, which is the only kind anything here needs.

Enums

Phase

Which part of the pipeline a run is in.

Step

One thing that happened, as it happened.

Traits

Watcher

Somewhere to send a run’s steps while it is still running.