import os from 'node:os';
import path from 'node:path';

/**
 * Resolves a given file path, supporting tilde expansion for home directories.
 *
 * If the input path starts with a tilde followed by a path separator (e.g.,
 * "~/"), it will be expanded to the user's home directory. Otherwise, the input
 * path will be resolved to an absolute path using `path.resolve()`.
 *
 * @param input - The file path to resolve, which may include a tilde for home
 *   directory expansion.
 * @returns The resolved absolute file path.
 */
export function resolvePath(input: string): string {
  return input.startsWith(`~${path.sep}`)
    ? path.join(os.homedir(), input.slice(1 + path.sep.length))
    : path.resolve(input);
}