Crate rget 

rget — a resumable, parallel HTTP download manager.

The crate is split so that each concern can be tested on its own:

module	responsibility
cli	argument parsing, command dispatch
config	user settings and the first-run download-folder prompt
http	requests, redirects, metadata probing, range requests
engine	orchestration: probe → plan → transfer → verify
scheduler	range planning, worker assignment, dynamic splitting
worker	one range transfer at a time
storage	SQLite persistence
[file]	random-access writes, preallocation
resume	recovery, reconciliation, remote validation
retry	retry policy and backoff
integrity	checksums
progress	telemetry model, speed and ETA maths
ui	terminal rendering
mirror	mirror equivalence and source selection
naming	destination filename selection and sanitisation
limit	global bandwidth limiting

The one design document worth reading before changing anything: docs/CRASH_CONSISTENCY.md.

Modules

cli

Argument parsing and command dispatch (PRD §37).

config

User settings, and the first-run download-folder prompt.

engine

Download orchestration.

error

Transfer-level errors, classified by whether retrying could possibly help.

file

Random-access destination file (PRD §9).

fmt

Human-facing formatting and the minimal ANSI styling we need.

http

HTTP client, metadata probing and range requests (PRD §6).

integrity

Checksum verification (PRD §16).

limit

Global bandwidth limiting (PRD §23).

mirror

Mirrors and source selection (PRD §15).

naming

Destination filename selection and sanitisation.

progress

Progress telemetry (PRD §17, §18).

resume

Resume: remote validation and state reconciliation (PRD §12, §13).

retry

Exponential backoff with jitter (PRD §14).

scheduler

Byte-range planning and worker assignment (PRD §7, §8).

shutdown

Cooperative cancellation (PRD §26).

storage

Central SQLite state store (PRD §10, §11).

ui

Terminal rendering (PRD §19).

worker

One worker transferring one range at a time.