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

if [ "$#" -lt 1 ] || [ "$#" -gt 2 ]; then
    printf 'Usage: %s <tape-file> [output-file]\n' "$0" >&2
    exit 1
fi

if ! command -v vhs >/dev/null 2>&1; then
    printf '%s\n' 'vhs is required to render terminal recordings.' >&2
    exit 1
fi

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
TAPE_FILE="$1"
OUTPUT_FILE="${2:-}"

cd "$ROOT_DIR"
vhs validate "$TAPE_FILE"

if [ -n "$OUTPUT_FILE" ]; then
    vhs -o "$OUTPUT_FILE" "$TAPE_FILE"
else
    vhs "$TAPE_FILE"
fi