setup-rust

Check whether the repository contains any Cargo.toml file before changing settings. If none exists, report that no Rust project was detected and do not add Rust hooks.

When a Cargo.toml exists, configure Claude Code hooks in the project settings so Rust commands run automatically without blocking the main action.

Prefer editing .claude/settings.json in the repository. If the repository already uses .claude/settings.local.json for local-only automation, follow the existing pattern instead of introducing a second settings file.

Add Rust commands as non-blocking shell hooks by appending || true to each command:

• cargo check || true
• cargo fmt --all || true
• cargo clippy --all-targets --all-features -- -D warnings || true

Use cargo fmt --all, not plain cargo fmt. Use cargo clippy --all-targets --all-features -- -D warnings, not a shorter variant.

If the settings file already contains hooks, merge the Rust hooks into the existing structure instead of replacing unrelated entries. Avoid duplicate Rust hook commands.

After editing settings, read the final file back and verify that all three Rust commands are present exactly once with the required flags.