vibed/nbd/.nbd/tickets/5f1495.md

+++ title = "nbd update diff output" priority = 5 status = "todo" ticket_type = "feature" dependencies = [] +++ Show a git-diff-style +/- summary of what changed when nbd update is run without --json.

Motivation

Currently nbd update prints the full ticket after the change, making it hard to see at a glance what actually changed. A diff view — showing only changed fields — is more informative.

Approach

display.rs

Add format_diff(old: &Ticket, new: &Ticket) -> String:

• Compare each field between old and new.
• For each field that changed, emit two lines:

  - status:   todo
  + status:   in_progress
  

• If no fields changed, emit (no changes).
• Fields compared: title, body, priority, status, ticket_type, dependencies.
• id is never shown (it cannot change).
• Label width matches format_ticket (LABEL_WIDTH).

Add print_diff(old: &Ticket, new: &Ticket) that calls println!("{}" format_diff(...)).

main.rs

In cmd_update:

• Before applying changes: let old = ticket.clone();
• After write_ticket:
  • If json: current behaviour (print new ticket as JSON).
  • Else: display::print_diff(&old, &ticket).

Tests

Unit tests in src/tests.rs:

• format_diff shows changed fields only.
• format_diff with identical tickets outputs (no changes).
• Changed dependencies are shown as comma-separated lists on each line.

Integration test:

• nbd update <id> --status in_progress (no --json) prints - status: and + status: lines.
• nbd update <id> --json still prints full JSON (no diff).

Files touched

• src/display.rs — format_diff, print_diff
• src/main.rs — cmd_update uses print_diff
• src/tests.rs — unit tests for format_diff
• tests/integration.rs — integration tests