CLI Download Retry

`ed download retry`

Puts a failed or interrupted entry back into the queue.

Usage:

ed download retry <n> [--json]
ed download retry --all [--json]

Arguments:

Name	Type / values	Default	What it does
`<n>`	integer, counting from 1	none	The download to retry, numbered as `ed download ls` numbers it. Optional, but required unless `--all` is passed.

Options:

Name	Type / values	Default	What it does
`--all`	flag	off	Retries everything that failed or was interrupted.
`--json`	flag	off	Emits one JSON document on stdout.

Only failed and interrupted entries can be retried; retrying sets them back to queued and leaves everything else alone. Naming an entry in any other state exits 1 and says which state it is in, rather than silently doing nothing. Passing neither a number nor --all also exits 1. --all on a queue with nothing to retry is not an error: it reports 0 and exits 0.

--json shape:

{
  "retried": 2
}

Examples:

ed download retry 3
ed download retry --all
ed download retry --all --json

$ ed download retry 1
error: download 1 is done, so there is nothing to retry

Behaviour: retry rewrites downloads.json when something changed, and posts downloadQueueChanged either way, so a running Edith picks the work up at once rather than waiting for its next look at the file. Retrying by number matches on the entry's URL rather than on its position, so if the same link failed twice, ed download retry 3 re-queues both copies and retried says 2. The "Edith is not running" note applies here too, on the human path only.