Crate diffier 

diffier: a live diff feed for Claude Code edits.

diffier hook, registered in Claude Code’s settings, snapshots files before each edit and appends the hook payload to a JSONL spool. The TUI tails the spool, diffs the snapshot against the file on disk, and renders the result.

Modules

app

TUI state: the card feed, scrolling, follow mode, and the spool tail loop.

diff

Unified diff computation and classification.

event

Tolerant model of a Claude Code hook payload as written to the spool.

hook

The diffier hook subcommand: consume one Claude Code hook payload.

install

Register and remove the diffier hook entries in Claude Code settings.

paths

Filesystem locations shared between diffier hook and the monitor.

render

Turn a CardInput into styled terminal lines, via delta or a plain fallback.

session

Turn a stream of hook events for one directory into edit cards.

snapshot

Resolve the pre-edit content for a PostToolUse event.

spool

Reading the JSONL spool: full replay scans and incremental tailing.

ui

Drawing: a body of visible feed lines and a one-line status bar.