fmt

name	fmt
description	Format Rust code with rustfmt and report what changed.

/fmt

Format the codebase. Single source of formatting truth.

Steps

1. Verify rustfmt is installed

rustup component list --installed | grep rustfmt

If missing: rustup component add rustfmt. If that fails, halt with "Run /setup first."

2. Run rustfmt

cargo fmt

Capture the output. cargo fmt reformats all .rs files in the workspace in place.

3. Report what changed

git diff --name-only

Parse the list to find .rs files that were modified by the formatter.

Report one of:

• Reformatted: list the files that were rewritten (file: per line).
• Already formatted: print "Nothing to do — all files already formatted."
• Error: print the offending file and the error verbatim. Do not attempt to fix syntax errors — they must be resolved by the user.

Do not run in --check mode here — /fmt is the apply step. The PostToolUse hook is the check step. The /commit gate runs --check separately.