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// Hardcoded dictionary of well-known commands and their arity
// (number of tokens that form the "human-understandable" prefix)
const ARITY: Record<string, number> = {
	git: 2, // "git checkout", "git commit", etc.
	npm: 3, // "npm run dev", "npm install -g"
	docker: 2, // "docker compose", "docker build"
	kubectl: 2, // "kubectl get", "kubectl apply"
	bun: 2, // "bun install", "bun test"
	cargo: 2, // "cargo build", "cargo test"
	go: 2, // "go build", "go test"
	python: 2, // "python -m", "python script.py"
	python3: 2,
	pip: 2,
	pip3: 2,
	brew: 2,
	apt: 2,
	"apt-get": 2,
	dnf: 2,
	yum: 2,
	pacman: 2,
	systemctl: 2,
	journalctl: 2,
	ssh: 2,
	scp: 2,
	rsync: 2,
	curl: 2, // "curl -X", "curl https://"
	wget: 2,
	tar: 2, // "tar -xzf", "tar -czf"
	zip: 2,
	unzip: 2,
	chown: 2,
	chmod: 2,
	mount: 2,
	umount: 2,
	// Default: all other commands are arity 1
};

// Get the normalized prefix for a list of tokens
export function prefix(tokens: string[]): string[] {
	if (tokens.length === 0) return [];
	const first = tokens[0];
	if (!first) return [];
	const arity = ARITY[first.toLowerCase()];
	if (arity === undefined) {
		return [first];
	}
	return tokens.slice(0, arity);
}