miner_schedule/cmd_line_args.cpp

#include <getopt.h>
#include <iostream>
#include <fmt/format.h>
#include "cmd_line_args.h"

static struct option options[] =
        {
            {"help",              no_argument,       NULL, '?'},
            {"version",           no_argument,       NULL, 'v'},
            {"config-file",       optional_argument, NULL, 'c'},
            {"initial-pin-state", optional_argument, NULL, 's'},
            {NULL,                0,                 NULL,  0 }
        };

static constexpr auto optc = "?v:c:";

static constexpr auto help_format =
        "{0} v{1}\n\n"
        "Usage:\n"
        "Availabe options are:\n"
        "\t--help              Show help\n"
        "\t--config-file       Config file path\n"
        "\t--initial-pin-state Initial state of control pin\n"
        "\t--version           Version of the {0}\n"
        "\n"
        "Usage example:\n"
        "{0} --config-file=scheduler.conf\n"
        "\n\n";
static constexpr auto version_format = 
        "{0} v{1}\n\n"
        "Build with gcc-{2}";  

void usage() {
    std::cout << fmt::format(help_format, APP_NAME, APP_VERSION) << std::endl;
    exit(0);
}

void version() {
    std::cout << fmt::format(version_format, APP_NAME, APP_VERSION, APP_GCC) << std::endl;
    exit(0);
}

app_options parse_opts(int argc, char** argv) {
    if(argc < 1){
        exit(1);
    }

    std::string config_file {""};
    int initial_pin_state = 0;

    for(;;) {
        int opt_idx, c;

        if((c = getopt_long(argc, argv, optc, options, &opt_idx)) == -1) break;

        switch(c) {
        case '?':
            usage();
            break;
        case 'v':
            version();
            break;
        case 'c':
            config_file = optarg;
            break;
        case 's':
            initial_pin_state = std::stoi(optarg);
            break;
        default:
            exit(1);
        }
    }

    return {config_file, initial_pin_state};
}