From a Rob Pike pass over the tree:
- singleOnce adds deltas to d.completed like pump does, instead of
storing absolute offsets, so the counter has one write discipline.
- one overMirrors helper replaces the three copy-pasted mirror-fallover
loops in probeRetry, fetchSeg and single.
- failedDownload becomes a pointer, the only value-type Download impl, so
Engine.untrack's == is always pointer identity and can't compare the
fields of a value (keying on Stat().ID is out — a torrent's ID changes
from source to infohash once metadata loads).
webseed/peer/tracker warnings (the 403/429 chatter) go through slog, the
rest through the legacy analog logger; both default to Warning, which
interleaves with and corrupts the live progress block. Filter both to
Error and above so only genuine errors reach stderr. quietSlogger is a
small testable helper; anacrolix/log becomes a direct dependency.
lineMany crammed every download onto one line as name+percent, dropping
the speed column that answers "which one is stalled" and producing ugly
double brackets for names like "[Gecko]". render N>1 as a redrawn block:
one row each (name, bar, percent, DL speed, ETA/stalled), a header with
the active count and totals, falling back to a single summary line when
the table would overflow the window. one download keeps its dashboard.
a .torrent fetched over http is added to the shared client in a second
pass (followUps); two that name the same torrent would share one torrent
on the refcount-less client, and the first to finish would Drop it out
from under the other, stranding it at 0%. dedupe the followed files by
infohash, the guard build() already applies to pass-1 sources.
an idle worker now steals the back half of the busiest in-flight segment
instead of exiting, so one slow segment no longer drains alone over a single
connection. control file persists stolen tails; resume re-tiles.
add --auto-split (opt-in): derive the connection count from file size (one
per min-split-size, up to 16), overriding -x/-s. default stays at 1
connection for a single server.
