Function parseFlags

packages/computer/src/artifacts/cli.ts:743–777

(args: string[], table: FlagTable)

}

function parseFlags(args: string[], table: FlagTable): ParsedFlags | { error: string } {
  const flags: Record<string, string | boolean> = {};
  const positional: string[] = [];
  for (let i = 0; i < args.length; i++) {
    const arg = args[i];
    if (arg === "--") {
      // Everything after `--` is positional.
      positional.push(...args.slice(i + 1));
      break;
    }
    if (arg.startsWith("--")) {
      const eq = arg.indexOf("=");
      const name = eq === -1 ? arg.slice(2) : arg.slice(2, eq);
      const spec = table[name];
      if (!spec) return { error: `unknown option '--${name}'` };
      if (spec.kind === "bool") {
        if (eq !== -1) return { error: `option '--${name}' takes no value` };
        flags[name] = true;
        continue;
      }
      // value flag
      if (eq !== -1) {
        flags[name] = arg.slice(eq + 1);
        continue;
      }
      const next = args[i + 1];
      if (next === undefined) return { error: `option '--${name}' requires a value` };
      flags[name] = next;
      i++;
      continue;
    }
    positional.push(arg);
  }
  return { flags, positional };
}