Low quality header-only C++ command line argument parser library inspired by clap.
#include "clapp.hpp"
#include <iostream>
#include <string>
int main(int argc, char* argv[])
{
clapp::app app("FooBar");
auto result = app.version("1.0")
.description("Example Program")
.arg(app.new_arg("first_number").required(true).value_name("FIRST"))
.arg(app.new_arg("second_number").required(true).value_name("SECOND"))
.arg(app.new_arg("operator")
.short_flag('o')
.long_flag("operator")
.takes_value(true)
.default_value("+")
.description("Valid operators: +, -, *, /"))
.arg(app.new_arg("prefix").short_flag('p').long_flag("prefix").takes_value(true))
.arg(app.new_arg("suffix").short_flag('s').long_flag("suffix").takes_value(true))
.parse(argc, argv);
if (!result) {
std::cout << "error: " << result.error_message() << std::endl;
return -1;
}
if (result.is_present("help")) {
std::cout << app.help() << std::endl;
return 0;
}
if (result.is_present("version")) {
std::cout << app.version() << std::endl;
return 0;
}
auto first_number = std::stof(result.value_of("first_number"));
auto second_number = std::stof(result.value_of("second_number"));
auto operation = result.value_of("operation");
auto prefix = result.value_of("prefix");
auto suffix = result.value_of("suffix");
float operation_result = 0;
if (operation == "+") {
operation_result = first_number + second_number;
} else if (operation == "-") {
operation_result = first_number - second_number;
} else if (operation == "*") {
operation_result = first_number * second_number;
} else if (operation == "/") {
operation_result = first_number / second_number;
} else {
std::cout << "Invalid operation" << std::endl;
return -1;
}
std::cout << prefix << operation_result << suffix << std::endl;
return 0;
}
- Tests
- Subcommands