Janice jan

A file sync tool that refuses to waste your time.

Why

Because copying the same 5GB file again just because you renamed it is barbaric.

What it does

It looks at both sides, figures out what's actually different, and only touches that. No drama, no wasted bandwidth, no "oops I recopied a 12GB video because I renamed a folder" energy. BLAKE3 keeps hashing fast, streaming keeps memory flat, and rename detection keeps your mistakes cheap.

Install

cargo install janice

Or grab a binary if compiling triggers your fight‑or‑flight.

Use

jan SOURCE DEST

Useful flags:

-n  dry run (trust issues)
-d  delete files in DEST that aren't in SOURCE
-y  don't ask questions
-e  skip junk
-j N  threads (more threads, more fan noise)
-q  silence
-v  the opposite of silence

Example:

jan ~/stuff /mnt/backup/stuff -qdy

Runs nightly, never speaks, never complains. A role model. Jealous yet?

How it works

Hashes everything, compares fingerprints, moves what's moved, copies what's new, ignores what’s unchanged. All while pretending not to care.

Planned

• Robust delta engine (rsync-style rolling + content-defined chunking)
• Native SSH transport (no more mount workarounds)
• Resumable transfers (interruption is not failure)
• Atomic apply (no half-synced nightmare states)
• Merkle/BLAKE3 verification (trust, but actually verify)

License

MIT. Do whatever. Couldn't care. Godspeed.