getopt_long: hack to read in an arbitrary number of arguments for a single option

getopt_long

/* Compile with:
 *    g++ -Wall -std=c++11 dummy.cpp -o dummy -O
 * Run as:
 *    ./dummy -s *.txt
 */

#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#include <string.h>
#include <getopt.h>

using namespace std;

void print_help() {
    cout << "Dummy help." << endl;
}

string versionline("fakety fakety fakety fake.");

static struct option const long_options[] =
{
    {"seqf", required_argument, NULL, 's'},
    {"outf", required_argument, NULL, 'o'},
    {"help", no_argument, NULL, 'h'},
    {"version", no_argument, NULL, 'V'},
    {NULL, 0, NULL, 0}
};

int main(int argc, char * argv[]) {
    bool fileset = false;
    vector <string> inputFiles;
    string outf = "";

    while (1) {
        int oi = -1;
        int curind = optind;
        int c = getopt_long(argc, argv, "s:o:hV", long_options, &oi);
        if (c == -1) {
            break;
        }
        switch(c) { // hack to read in an arbitrary number of arguments for a single option
            case 's':
                fileset = true;
                curind = optind - 1;
                while (curind < argc) {
                    string temp = strdup(argv[curind]);
                    curind++;
                    if (temp[0] != '-') {
                        ifstream infile(temp.c_str());
                        if (infile.good()) { // check that file exists
                            inputFiles.push_back(temp);
                            infile.close();
                        } else {
                            cout << "Cannot find input file '" << temp << "'. Exiting." << endl;
                            exit(0);
                        }
                    } else {
                        optind = curind - 1;
                        break;
                    }
                }
                break;
            case 'o':
                outf = strdup(optarg);
                break;
            case 'h':
                print_help();
                exit(0);
            case 'V':
                cout << versionline << endl;
                exit(0);
            default:
                cout << "Exiting." << endl;
                exit(0);
        }
    }

    if (fileset) {
        for (int i = 0; i < (int)inputFiles.size(); i++) {
            cout << "File #" << i << ": " << inputFiles[i] << endl;
        }
    }
    return 0;
}