#!/usr/bin/env sh

set -eu

dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)

error() {
    echo "Error: $1" 1>&2
}

usage() {
    echo "Usage: $0 [-h|--help] EXAMPLE_FILE"
}

py_pkg="tree-sitter-python@0.20.1"
py_dir="$dir/.$py_pkg"
if [ ! -e "$py_dir" ]; then
    echo "Missing Python grammar. Run bootstrap script to install."
    exit 1
fi

while [ $# -gt 0 ]; do
    arg="$1"
    shift 1
    case "$arg" in
        -h|--help)
            usage
            exit 0
            ;;
        *)
            example_file="$arg"
            if [ $# -gt 0 ]; then
                error "Too many positional arguments provided."
                usage 1>&2
                exit 1
            fi
            ;;
    esac
done

if [ ! -e "$example_file" ]; then
    error "Missing file $example_file."
    exit 1
fi

cargo -q run --features=cli -- parse --grammar "$py_dir" "$example_file"