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// Copyright (c) 2017-2025, University of Cincinnati, developed by Henry Schreiner
// under NSF AWARD 1414736 and by the respective contributors.
// All rights reserved.
//
// SPDX-License-Identifier: BSD-3-Clause
#include <CLI/CLI.hpp>
#include <ctime>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
// Custom validator is an alias of Validator, the constructor takes a function that takes as input and returns a string
const CLI::CustomValidator ISO8601(
[](std::string &input) {
std::tm tm = {};
std::istringstream ss(input);
ss >> std::get_time(&tm, "%Y-%m-%dT%H:%M:%S");
if(ss.fail()) {
return std::string("Failed to parse time string");
}
return std::string{};
},
"datetime[%Y-%m-%dT%H:%M:%S]");
int main(int argc, char **argv) {
CLI::App app("custom validator testing");
std::string value;
app.add_option("--time", value, "enter a date in iso8601 format")->check(ISO8601)->required();
CLI11_PARSE(app, argc, argv);
std::cout << "date given = " << value << '\n';
return 0;
}
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