git-is-worktree-clean

#!/usr/bin/env bash

app_name="$(basename "${BASH_SOURCE[0]}")"

print_help() {
	expand -t 4 << EOF
Usage:
	$app_name
		Returns 0 if the working tree has no changes or untracked files, non-zero otherwise.

Options:
	-q, --quiet
		Suppress output.

	-?, --help
		Show this help information and exit.
EOF
}

quiet=0

while [[ $# -gt 0 ]]; do
	case "$1" in
		-q|--quiet)
			quiet=1
			shift
			;;
		-\?|--help)
			print_help
			exit 0
			;;
		-*)
			echo "$app_name: [Error] Unknown option: $1" >&2
			exit 1
			;;
		*)
			echo "$app_name: [Error] Unexpected argument: $1" >&2
			exit 1
			;;
	esac
done

status="$(git status --porcelain)"
success=$?
[[ success -eq 0 ]] || exit "$success"

if [[ -z "$status" ]]; then
	[[ quiet -eq 0 ]] && echo "yes"
	exit 0
else
	[[ quiet -eq 0 ]] && echo "no"
	exit 1
fi