Module excerpt 

The part of a captured run worth reading when it failed.

amont-agent quiet keeps the whole output in a log file and prints only this: the failure blocks of the run, then the runner’s own summary. The heuristic never decides pass or fail (the child’s exit code does); it only chooses which lines to show.

Hand-written over lowercased lines with word-boundary checks, on purpose: no regex dependency (docs/plans/2026-10-11-test-output-keeps-its-status.md, Decisions). The same function exists in amont, which shares no crate with this one; the golden fixtures in tests/fixtures/excerpt/ are what keep the two copies saying the same thing.

Memory

The run’s output can be gigabytes, so the accumulator is fed in chunks and holds at most 64 KB whatever it is fed: the line being assembled (1 KB), a ring of the last 40 lines held to 60 KB - bound, and the excerpt itself (finished blocks plus the block in progress) held to bound.

Structs

Accumulator

Constants

DEFAULT_BOUND

The excerpt total when --max-bytes is not given.

MAX_BOUND

The largest --max-bytes accepted.

Functions

clean

Strip ANSI escape sequences and keep what a terminal would show after a carriage return (progress bars rewrite their line).