format-code

#!/usr/bin/env bash
set -euo pipefail

# Run from the project root, even when invoked from another directory.
ROOT="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
cd -- "$ROOT"

usage() {
    cat <<'HELP'
Usage: ./format-code [--check]

Format Rust code in all workspace packages with cargo fmt.
--check checks formatting without modifying files.

Install dependencies with rustup:
  rustup component add rustfmt
HELP
}

if (( $# > 1 )); then
    usage >&2
    exit 2
fi

args=()
case "${1:-}" in
    '')
        if (( $# != 0 )); then
            usage >&2
            exit 2
        fi
        ;;
    --check) args+=(--check) ;;
    -h|--help) usage; exit 0 ;;
    *) usage >&2; exit 2 ;;
esac

if ! command -v cargo >/dev/null 2>&1; then
    echo 'Error: cargo is not installed or not on PATH.' >&2
    exit 127
fi

if ! cargo fmt --version >/dev/null 2>&1; then
    echo 'Error: cargo fmt is unavailable. Install rustfmt: rustup component add rustfmt' >&2
    exit 1
fi

exec cargo fmt --all "${args[@]}"