/**
 * @fileoverview Process-related helper functions
 * @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a> (@jeffpar)
 * @version 1.0
 * Created 2014-05-07
 *
 * Copyright © 2012-2016 Jeff Parsons <Jeff@pcjs.org>
 *
 * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
 *
 * PCjs is free software: you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with PCjs.  If not,
 * see <http://www.gnu.org/licenses/gpl.html>.
 *
 * You are required to include the above copyright notice in every source code file of every
 * copy or modified version of this work, and to display that copyright notice on every screen
 * that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).
 *
 * Some PCjs files also attempt to load external resource files, such as character-image files,
 * ROM files, and disk image files. Those external resource files are not considered part of PCjs
 * for purposes of the GNU General Public License, and the author does not claim any copyright
 * as to their contents.
 */

"use strict";

var proc = {};

/**
 * getArgs()
 *
 * Processes command-line arguments.  Arguments may be introduced by either
 * a double-hyphen (--) or a long dash (—), and argument values, if any, must be
 * separated by an "=" without any intervening whitespace.  Arguments without
 * an explicit value default to true, and any argument appearing more than once
 * is automatically converted to an Array.
 *
 * Single-hyphen (-) arguments are allowed as well; they are treated as a series
 * of single-character arguments, each set to true, and any of these arguments
 * appearing more than once is discarded.
 *
 * @return {{argc:number, argv:{}}}
 */
proc.getArgs = function() {
    var argc = 0;
    var argv = {};
    for (var i = 2; i < process.argv.length; i++) {
        var j, sSep;
        var sArg = process.argv[i];
        if (!sArg.indexOf(sSep = "--") || !sArg.indexOf(sSep = "—")) {
            sArg = sArg.substr(sSep.length);
            var sValue = true;
            j = sArg.indexOf("=");
            if (j > 0) {
                sValue = sArg.substr(j+1);
                sArg = sArg.substr(0, j);
                sValue = (sValue == "true")? true : ((sValue == "false")? false : sValue);
            }
            if (argv[sArg] === undefined) {
                argc++;
                argv[sArg] = sValue;
            } else {
                // console.log("too many '" + sArg + "' arguments");
                if (typeof argv[sArg] == "string") {
                    argv[sArg] = [argv[sArg]];
                }
                argv[sArg].push(sValue);
            }
        } else if (!sArg.indexOf("-")) {
            for (j = 1; j < sArg.length; j++) {
                var ch = sArg.charAt(j);
                if (argv[ch] === undefined) {
                    argv[ch] = true;
                    argc++;
                }
            }
        }
    }
    return {argc: argc, argv: argv};
};

if (NODE) module.exports = proc;