#!/bin/bash
if declare -p _global_pragma_once_sign >/dev/null 2>&1; then
  return 0
fi
readonly _global_pragma_once_sign=true
declare -gA _global_loaded_scripts=()
pragma_once() {
  local abs_path
  abs_path="$(realpath "$1" 2>/dev/null)" || {
    echo "错误: 文件 '$1' 不存在。" >&2
    return 2
  }
  if [[ -n "${_global_loaded_scripts[$abs_path]+x}" ]]; then
    return 1
  fi
  _global_loaded_scripts["$abs_path"]=1
  return 0
}