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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 <string>
int main(int argc, char **argv) {
std::string input_file_name, output_file_name;
int level{5}, subopt{0};
// app caption
CLI::App app{"CLI11 help"};
app.require_subcommand(1);
// subcommands options and flags
CLI::App *const encode = app.add_subcommand("e", "encode")->ignore_case(); // ignore case
encode->add_option("input", input_file_name, "input file")
->option_text(" ")
->required()
->check(CLI::ExistingFile); // file must exist
encode->add_option("output", output_file_name, "output file")->option_text(" ")->required(); // required option
encode->add_option("-l, --level", level, "encoding level")
->option_text("[1..9]")
->check(CLI::Range(1, 9))
->default_val(5); // limit parameter range
encode->add_flag("-R, --remove", "remove input file"); // no parameter option
encode->add_flag("-s, --suboption", subopt, "suboption")->option_text(" ");
CLI::App *const decode = app.add_subcommand("d", "decode")->ignore_case();
decode->add_option("input", input_file_name, "input file")->option_text(" ")->required()->check(CLI::ExistingFile);
decode->add_option("output", output_file_name, "output file")->option_text(" ")->required();
// Usage message modification
std::string usage_msg = "Usage: " + std::string(argv[0]) + " <command> [options] <input-file> <output-file>";
app.usage(usage_msg);
// flag to display full help at once
app.set_help_flag("");
app.set_help_all_flag("-h, --help");
CLI11_PARSE(app, argc, argv);
return 0;
}
/*
$ ./help_usage -h
CLI11 help
OPTIONS:
-h, --help
SUBCOMMANDS:
e
encode
POSITIONALS:
input input file
output output file
OPTIONS:
-l, --level [1..9] encoding level
-R, --remove remove input file
-s, --suboption suboption
d
decode
POSITIONALS:
input input file
output output file
*/
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