/**
 * Copyright (c) 2010 Chris O'Hara <cohara87@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

 //Note: cli includes kof/node-natives and creationix/stack. I couldn't find
 //license information for either - contact me if you want your license added

var cli = exports,
    argv, curr_opt, curr_val, full_opt, is_long,
    short_tags = [], opt_list, parsed = {},
    usage, argv_parsed, command_list, commands,
    show_debug;

cli.app = null;
cli.version = null;
cli.argv = [];
cli.argc = 0;

cli.options = {};
cli.args = [];
cli.command = null;

cli.width = 70;
cli.option_width = 25;

/**
 * Bind kof's node-natives (https://github.com/kof/node-natives) to `cli.native`
 *
 * Rather than requiring node natives (e.g. var fs = require('fs')), all
 * native modules can be accessed like `cli.native.fs`
 */
cli.native = {};
var define_native = function (module) {
    Object.defineProperty(cli.native, module, {
        enumerable: true,
        configurable: true,
        get: function() {
            delete cli.native[module];
            return (cli.native[module] = require(module));
        }
    });
};
var natives = process.binding('natives');
for (var module in natives) {
    define_native(module);
}

cli.output = console.log;
cli.exit = require('exit');

cli.no_color = false;
if (process.env.NODE_DISABLE_COLORS || process.env.TERM === 'dumb') {
    cli.no_color = true;
}

/**
 * Define plugins. Plugins can be enabled and disabled by calling:
 *
 *     `cli.enable(plugin1, [plugin2, ...])`
 *     `cli.disable(plugin1, [plugin2, ...])`
 *
 * Methods are chainable - `cli.enable(plugin).disable(plugin2)`.
 *
 * The 'help' plugin is enabled by default.
 */
var enable = {
    help: true,      //Adds -h, --help
    version: false,  //Adds -v,--version => gets version by parsing a nearby package.json
    status: false,   //Adds -k,--no-color & --debug => display plain status messages /display debug messages
    timeout: false,  //Adds -t,--timeout N => timeout the process after N seconds
    catchall: false, //Adds -c,--catch => catch and output uncaughtExceptions
    glob: false      //Adds glob matching => use cli.glob(arg)
}
cli.enable = function (/*plugins*/) {
    Array.prototype.slice.call(arguments).forEach(function (plugin) {
        switch (plugin) {
        case 'catchall':
            process.on('uncaughtException', function (err) {
                cli.error('Uncaught exception: ' + (err.msg || err));
            });
            break;
        case 'help': case 'version': case 'status':
        case 'autocomplete': case 'timeout':
            //Just add switches.
            break;
        case 'glob':
            cli.glob = require('glob');
            break;
        default:
            cli.fatal('Unknown plugin "' + plugin + '"');
            break;
        }
        enable[plugin] = true;
    });
    return cli;
}
cli.disable = function (/*plugins*/) {
    Array.prototype.slice.call(arguments).forEach(function (plugin) {
        if (enable[plugin]) {
            enable[plugin] = false;
        }
    });
    return cli;
}

/**
 * Sets argv (default is process.argv).
 *
 * @param {Array|String} argv
 * @param {Boolean} keep_arg0 (optional - default is false)
 * @api public
 */
cli.setArgv = function (arr, keep_arg0) {
    if (typeof arr == 'string') {
      arr = arr.split(' ');
    } else {
      arr = arr.slice();
    }
    cli.app = arr.shift();
    // Strip off argv[0] if it's a node binary
    // So this is still broken and will break if you are calling node through a
    // symlink, unless you are lucky enough to have it as 'node' literal. Latter
    // is a hack, but resolving abspaths/symlinks is an unportable can of worms.
    if (!keep_arg0 && (['node', 'node.exe'].indexOf(cli.native.path.basename(cli.app)) !== -1
            || cli.native.path.basename(process.execPath) === cli.app
            || process.execPath === cli.app)) {
        cli.app = arr.shift();
    }
    cli.app = cli.native.path.basename(cli.app);
    argv_parsed = false;
    cli.args = cli.argv = argv = arr;
    cli.argc = argv.length;
    cli.options = {};
    cli.command = null;
};
cli.setArgv(process.argv);

/**
 * Returns the next opt, or false if no opts are found.
 *
 * @return {String} opt
 * @api public
 */
cli.next = function () {
    if (!argv_parsed) {
        cli.args = [];
        argv_parsed = true;
    }

    curr_val = null;

    //If we're currently in a group of short opts (e.g. -abc), return the next opt
    if (short_tags.length) {
        curr_opt = short_tags.shift();
        full_opt = '-' + curr_opt;
        return curr_opt;
    }

    if (!argv.length) {
        return false;
    }

    curr_opt = argv.shift();

    //If an escape sequence is found (- or --), subsequent opts are ignored
    if (curr_opt === '-' || curr_opt === '--') {
        while (argv.length) {
            cli.args.push(argv.shift());
        }
        return false;
    }

    //If the next element in argv isn't an opt, add it to the list of args
    if (curr_opt[0] !== '-') {
        cli.args.push(curr_opt);
        return cli.next();
    } else {
        //Check if the opt is short/long
        is_long = curr_opt[1] === '-';
        curr_opt = curr_opt.substr(is_long ? 2 : 1);
    }

    //Accept grouped short opts, e.g. -abc => -a -b -c
    if (!is_long && curr_opt.length > 1) {
        short_tags = curr_opt.split('');
        return cli.next();
    }

    var eq, len;

    //Check if the long opt is in the form --option=VALUE
    if (is_long && (eq = curr_opt.indexOf('=')) >= 0) {
        curr_val = curr_opt.substr(eq + 1);
        curr_opt = curr_opt.substr(0, eq);
        len = curr_val.length;
        //Allow values to be quoted
        if ((curr_val[0] === '"' && curr_val[len - 1] === '"') ||
            (curr_val[0] === "'" && curr_val[len - 1] === "'"))
        {
            curr_val = curr_val.substr(1, len-2);
        }
        if (curr_val.match(/^[0-9]+$/)) {
            curr_val = parseInt(curr_val, 10);
        }
    }

    //Save the opt representation for later
    full_opt = (is_long ? '--' : '-') + curr_opt;

    return curr_opt;
};

/**
 * Parses command line opts.
 *
 * `opts` must be an object with opts defined like:
 *        long_tag: [short_tag, description, value_type, default_value];
 *
 * `commands` is an optional array or object for apps that are of the form
 *      my_app [OPTIONS] <command> [ARGS]
 *  The command list is output with usage information + there is bundled
 *  support for auto-completion, etc.
 *
 * See README.md for more information.
 *
 * @param {Object} opts
 * @param {Object} commands (optional)
 * @return {Object} opts (parsed)
 * @api public
 */
cli.parse = function (opts, command_def) {
    var default_val, i, o, parsed = cli.options, seen,
        catch_all = !opts;
    opt_list = opts || {};
    commands = command_def;
    command_list = commands || [];
    if (commands && !Array.isArray(commands)) {
        command_list = Object.keys(commands);
    }
    while ((o = cli.next())) {
        seen = false;
        for (var opt in opt_list) {
            if (!(opt_list[opt] instanceof Array)) {
                continue;
            }
            if (!opt_list[opt][0]) {
                opt_list[opt][0] = opt;
            }
            if (o === opt || o === opt_list[opt][0]) {
                seen = true;
                if (opt_list[opt].length === 2) {
                    parsed[opt] = true;
                    break;
                }
                default_val = null;
                if (opt_list[opt].length === 4) {
                    default_val = opt_list[opt][3];
                }
                if (opt_list[opt][2] instanceof Array) {
                    for (i = 0, l = opt_list[opt][2].length; i < l; i++) {
                        if (typeof opt_list[opt][2][i] === 'number') {
                            opt_list[opt][2][i] += '';
                        }
                    }
                    parsed[opt] = cli.getArrayValue(opt_list[opt][2], is_long ? null : default_val);
                    break;
                }
                if (opt_list[opt][2].toLowerCase) {
                    opt_list[opt][2] = opt_list[opt][2].toLowerCase();
                }
                switch (opt_list[opt][2]) {
                case 'string': case 1: case true:
                    parsed[opt] = cli.getValue(default_val);
                    break;
                case 'int': case 'number': case 'num':
                case 'time': case 'seconds': case 'secs': case 'minutes': case 'mins':
                case 'x': case 'n':
                    parsed[opt] = cli.getInt(default_val);
                    break;
                case 'date': case 'datetime': case 'date_time':
                    parsed[opt] = cli.getDate(default_val);
                    break;
                case 'float': case 'decimal':
                    parsed[opt] = cli.getFloat(default_val);
                    break;
                case 'path': case 'file': case 'directory': case 'dir':
                    parsed[opt] = cli.getPath(default_val, opt_list[opt][2]);
                    break;
                case 'email':
                    parsed[opt] = cli.getEmail(default_val);
                    break;
                case 'url': case 'uri': case 'domain': case 'host':
                    parsed[opt] = cli.getUrl(default_val, opt_list[opt][2]);
                    break;
                case 'ip':
                    parsed[opt] = cli.getIp(default_val);
                    break;
                case 'bool': case 'boolean': case 'on':
                    parsed[opt] = true;
                    break;
                case 'false': case 'off': case false: case 0:
                    parsed[opt] = false;
                    break;
                default:
                     cli.fatal('Unknown opt type "' + opt_list[opt][2] + '"');
                }
                break;
            }
        }
        if (!seen) {
            if (enable.help && (o === 'h' || o === 'help')) {
                cli.getUsage();
            } else if (enable.version && (o === 'v' || o === 'version')) {
                if (cli.version == null) {
                    cli.parsePackageJson();
                }
                console.error(cli.app + ' v' + cli.version);
                cli.exit();
                break;
            } else if (enable.catchall && (o === 'c' || o === 'catch')) {
                continue;
            } else if (enable.status && (o === 'k' || o === 'no-color')) {
                cli.no_color = (o === 'k' || o === 'no-color');
                continue;
            } else if (enable.status && (o === 'debug')) {
                show_debug = o === 'debug';
                continue;
            } else if (enable.timeout && (o === 't' || o === 'timeout')) {
                var secs = cli.getInt();
                setTimeout(function () {
                    cli.fatal('Process timed out after ' + secs + 's');
                }, secs * 1000);
                continue;
            } else if (catch_all) {
                parsed[o] = curr_val || true;
                continue;
            }
            cli.fatal('Unknown option ' + full_opt);
        }
    }
    //Fill the remaining options with their default value or null
    for (var opt in opt_list) {
        default_val = opt_list[opt].length === 4 ? opt_list[opt][3] : null;
        if (!(opt_list[opt] instanceof Array)) {
            parsed[opt] = opt_list[opt];
            continue;
        } else if (typeof parsed[opt] === 'undefined') {
            parsed[opt] = default_val;
        }
    }
    if (command_list.length) {
        if (cli.args.length === 0) {
            if (enable.help) {
                cli.getUsage();
            } else {
                cli.fatal('A command is required (' + command_list.join(', ') + ').');
            }
            return cli.exit(1);
        } else {
            cli.command = cli.autocompleteCommand(cli.args.shift());
        }
    }
    cli.argc = cli.args.length;
    return parsed;
};

/**
 * Helper method for matching a command from the command list.
 *
 * @param {String} command
 * @return {String} full_command
 * @api public
 */
cli.autocompleteCommand = function (command) {
    var list;
    if (!(command_list instanceof Array)) {
        list = Object.keys(command_list);
    } else {
        list = command_list;
    }
    var i, j = 0, c = command.length, tmp_list;
    if (list.length === 0 || list.indexOf(command) !== -1) {
        return command;
    }
    for (i = 0; i < c; i++) {
        tmp_list = [];
        l = list.length;
        if (l <= 1) break;
        for (j = 0; j < l; j++)
            if (list[j].length >= i && list[j][i] === command[i])
                tmp_list.push(list[j]);
        list = tmp_list;
    }
    l = list.length;
    if (l === 1) {
        return list[0];
    } else if (l === 0) {
        cli.fatal('Unknown command "' + command + '"' + (enable.help ? '. Please see --help for more information' : ''));
    } else {
        list.sort();
        cli.fatal('The command "' + command + '" is ambiguous and could mean "' + list.join('", "') + '"');
    }
};

/**
 * Adds methods to output styled status messages to stderr.
 *
 * Added methods are cli.info(msg), cli.error(msg), cli.ok(msg), and
 * cli.debug(msg).
 *
 * To control status messages, use the 'status' plugin
 *    1) debug() messages are hidden by default. Display them with
 *       the --debug opt.
 *    2) to hide all status messages, use the -s or --silent opt.
 *
 * @api private
 */
cli.status = function (msg, type) {
    var pre;
    switch (type) {
    case 'info':
        pre = cli.no_color ? 'INFO:' : '\x1B[33mINFO\x1B[0m:';
        break;
    case 'debug':
        pre = cli.no_color ? 'DEBUG:' : '\x1B[36mDEBUG\x1B[0m:';
        break;
    case 'error':
    case 'fatal':
        pre = cli.no_color ? 'ERROR:' : '\x1B[31mERROR\x1B[0m:';
        break;
    case 'ok':
        pre = cli.no_color ? 'OK:' : '\x1B[32mOK\x1B[0m:';
        break;
    }
    msg = pre + ' ' + msg;
    if (type === 'fatal') {
        console.error(msg);
        return cli.exit(1);
    }
    if (enable.status && !show_debug && type === 'debug') {
        return;
    }
    console.error(msg);
};
['info','error','ok','debug','fatal'].forEach(function (type) {
    cli[type] = function (msg) {
        cli.status(msg, type);
    };
});

/**
 * Sets the app name and version.
 *
 * Usage:
 *     setApp('myapp', '0.1.0');
 *     setApp('./package.json'); //Pull name/version from package.json
 *
 * @param {String} name
 * @return cli (for chaining)
 * @api public
 */
cli.setApp = function (name, version) {
    if (name.indexOf('package.json') !== -1) {
        cli.parsePackageJson(name);
    } else {
        cli.app = name;
        cli.version = version;
    }
    return cli;
};

/**
 * Parses the version number from package.json. If no path is specified, cli
 * will attempt to locate a package.json in ./, ../ or ../../
 *
 * @param {String} path (optional)
 * @api public
 */
cli.parsePackageJson = function (path) {
    var parse_packagejson = function (path) {
        var packagejson = JSON.parse(cli.native.fs.readFileSync(path, 'utf8'));
        cli.version = packagejson.version;
        cli.app = packagejson.name;
    };
    var try_all = function (arr, func, err) {
        for (var i = 0, l = arr.length; i < l; i++) {
            try {
                func(arr[i]);
                return;
            } catch (e) {
                if (i === l-1) {
                    cli.fatal(err);
                }
            }
        }
    };
    try {
        if (path) {
            return parse_packagejson(path);
        }
        try_all([
            __dirname + '/package.json',
            __dirname + '/../package.json',
            __dirname + '/../../package.json'
        ], parse_packagejson);
    } catch (e) {
        cli.fatal('Could not detect ' + cli.app + ' version');
    }
};

/**
 * Sets the usage string - default is `app [OPTIONS] [ARGS]`.
 *
 * @param {String} u
 * @return cli (for chaining)
 * @api public
 */
cli.setUsage = function (u) {
    usage = u;
    return cli;
};

var pad = function (str, len) {
    if (typeof len === 'undefined') {
        len = str;
        str = '';
    }
    if (str.length < len) {
        len -= str.length;
        while (len--) str += ' ';
    }
    return str;
};

/**
 * Automatically build usage information from the opts list. If the help
 * plugin is enabled (default), this info is displayed with -h, --help.
 *
 * @api public
 */
cli.getUsage = function (code) {
    var short, desc, optional, line, seen_opts = [],
        switch_pad = cli.option_width;

    var trunc_desc = function (pref, desc, len) {
        var pref_len = pref.length,
            desc_len = cli.width - pref_len,
            truncated = '';
        if (desc.length <= desc_len) {
            return desc;
        }
        var desc_words = (desc+'').split(' '), chars = 0, word;
        while (desc_words.length) {
            truncated += (word = desc_words.shift()) + ' ';
            chars += word.length;
            if (desc_words.length && chars + desc_words[0].length > desc_len) {
                truncated += '\n' + pad(pref_len);
                chars = 0;
            }
        }
        return truncated;
    };

    usage = usage || cli.app + ' [OPTIONS]' + (command_list.length ? ' <command>' : '') + ' [ARGS]';
    if (cli.no_color) {
        console.error('Usage:\n  ' + usage);
        console.error('Options: ');
    } else {
        console.error('\x1b[1mUsage\x1b[0m:\n  ' + usage);
        console.error('\n\x1b[1mOptions\x1b[0m: ');
    }
    for (var opt in opt_list) {

        if (opt.length === 1) {
            long = opt_list[opt][0];
            short = opt;
        } else {
            long = opt;
            short = opt_list[opt][0];
        }

        //Parse opt_list
        desc = opt_list[opt][1].trim();
        type = opt_list[opt].length >= 3 ? opt_list[opt][2] : null;
        optional = opt_list[opt].length === 4 ? opt_list[opt][3] : null;

        //Build usage line
        if (short === long) {
            if (short.length === 1) {
                line = '  -' + short;
            } else {
                line = '      --' + long;
            }
        } else if (short) {
            line = '  -' + short + ', --' + long;
        } else {
            line = '      --' + long;
        }
        line += ' ';

        if (type) {
            if (type instanceof Array) {
                desc += '. VALUE must be either [' + type.join('|') + ']';
                type = 'VALUE';
            }
            if (type === true || type === 1) {
                type = long.toUpperCase();
            }
            type = type.toUpperCase();
            if (type === 'FLOAT' || type === 'INT') {
                type = 'NUMBER';
            }
            line += optional ? '[' + type + ']' : type;
        }
        line = pad(line, switch_pad);
        line += trunc_desc(line, desc);
        line += optional ? ' (Default is ' + optional + ')' : '';
        console.error(line.replace('%s', '%\0s'));

        seen_opts.push(short);
        seen_opts.push(long);
    }
    if (enable.timeout && seen_opts.indexOf('t') === -1 && seen_opts.indexOf('timeout') === -1) {
        console.error(pad('  -t, --timeout N', switch_pad) + 'Exit if the process takes longer than N seconds');
    }
    if (enable.status) {
        if (seen_opts.indexOf('k') === -1 && seen_opts.indexOf('no-color') === -1) {
            console.error(pad('  -k, --no-color', switch_pad) + 'Omit color from output');
        }
        if (seen_opts.indexOf('debug') === -1) {
            console.error(pad('      --debug', switch_pad) + 'Show debug information');
        }
    }
    if (enable.catchall && seen_opts.indexOf('c') === -1 && seen_opts.indexOf('catch') === -1) {
        console.error(pad('  -c, --catch', switch_pad) + 'Catch unanticipated errors');
    }
    if (enable.version && seen_opts.indexOf('v') === -1 && seen_opts.indexOf('version') === -1) {
        console.error(pad('  -v, --version', switch_pad) + 'Display the current version');
    }
    if (enable.help && seen_opts.indexOf('h') === -1 && seen_opts.indexOf('help') === -1) {
        console.error(pad('  -h, --help', switch_pad) + 'Display help and usage details');
    }
    if (command_list.length) {
        console.error('\n\x1b[1mCommands\x1b[0m: ');
        if (!Array.isArray(commands)) {
            for (var c in commands) {
                line = '  ' + pad(c, switch_pad - 2);
                line += trunc_desc(line, commands[c]);
                console.error(line);
            }
        } else {
            command_list.sort();
            console.error('  ' + trunc_desc('  ', command_list.join(', ')));
        }
    }
    return cli.exit(code);
};

/**
 * Generates an error message when an opt is incorrectly used.
 *
 * @param {String} expects (e.g. 'a value')
 * @param {String} type (e.g. 'VALUE')
 * @api public
 */
cli.getOptError = function (expects, type) {
    var err = full_opt + ' expects ' + expects
            + '. Use `' + cli.app + ' ' + full_opt + (is_long ? '=' : ' ') + type + '`';
    return err;
};

/**
 * Gets the next opt value and validates it with an optional validation
 * function. If validation fails or no value can be obtained, this method
 * will return the default value (if specified) or exit with err_msg.
 *
 * @param {String} default_val
 * @param {Function} validate_func
 * @param {String} err_msg
 * @api public
 */
cli.getValue = function (default_val, validate_func, err_msg) {
    err_msg = err_msg || cli.getOptError('a value', 'VALUE');

    var value;

    try {
        if (curr_val) {
            if (validate_func) {
                curr_val = validate_func(curr_val);
            }
            return curr_val;
        }

        //Grouped short opts aren't allowed to have values
        if (short_tags.length) {
            throw 'Short tags';
        }

        //If there's no args left or the next arg is an opt, return the
        //default value (if specified) - otherwise fail
        if (!argv.length || (argv[0].length === 1 && argv[0][0] === '-')) {
            throw 'No value';
        }

        value = argv.shift();

        if (value.match(/^[0-9]+$/)) {
            value = parseInt(value, 10);
        }

        //Run the value through a validation/transformation function if specified
        if (validate_func) {
            value = validate_func(value);
        }
    } catch (e) {

        //The value didn't pass the validation/transformation. Unshift the value and
        //return the default value (if specified)
        if (value) {
            argv.unshift(value);
        }
        return default_val != null ? default_val : cli.fatal(err_msg);
    }
    return value;
};

cli.getInt = function (default_val) {
    return cli.getValue(default_val, function (value) {
        if (typeof value === 'number') return value;
        if (!value.match(/^(?:-?(?:0|[1-9][0-9]*))$/)) {
            throw 'Invalid int';
        }
        return parseInt(value);
    }, cli.getOptError('a number', 'NUMBER'));
}

cli.getDate = function (default_val) {

    return cli.getValue(default_val, function (value) {
        if (cli.toType(value) === 'date') return value;
        value = new Date(value);
        if ( ! value.getTime() ) {
            throw value.toString();
        }

        return value;
    }, cli.getOptError('a date', 'DATE'));
}

cli.getFloat = function (default_val) {
    return cli.getValue(default_val, function (value) {
        if (!value.match(/^(?:-?(?:0|[1-9][0-9]*))?(?:\.[0-9]*)?$/)) {
            throw 'Invalid float';
        }
        return parseFloat(value, 10);
    }, cli.getOptError('a number', 'NUMBER'));
}

cli.getUrl = function (default_val, identifier) {
    identifier = identifier || 'url';
    return cli.getValue(default_val, function (value) {
        if (!value.match(/^(?:(?:ht|f)tp(?:s?)\:\/\/|~\/|\/)?(?:\w+:\w+@)?((?:(?:[-\w\d{1-3}]+\.)+(?:com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|edu|co\.uk|ac\.uk|it|fr|tv|museum|asia|local|travel|[a-z]{2})?)|((\b25[0-5]\b|\b[2][0-4][0-9]\b|\b[0-1]?[0-9]?[0-9]\b)(\.(\b25[0-5]\b|\b[2][0-4][0-9]\b|\b[0-1]?[0-9]?[0-9]\b)){3}))(?::[\d]{1,5})?(?:(?:(?:\/(?:[-\w~!$+|.,=]|%[a-f\d]{2})+)+|\/)+|\?|#)?(?:(?:\?(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=?(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)(?:&(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=?(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)*)*(?:#(?:[-\w~!$ |\/.,*:;=]|%[a-f\d]{2})*)?$/i)) {
            throw 'Invalid URL';
        }
        return value;
    }, cli.getOptError('a ' + identifier, identifier.toUpperCase()));
}

cli.getEmail = function (default_val) {
    return cli.getValue(default_val, function (value) {
        if (!value.match(/^(?:[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+\.)*[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+@(?:(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!\.)){0,61}[a-zA-Z0-9]?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!$)){0,61}[a-zA-Z0-9]?)|(?:\[(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\]))$/)) {
            throw 'Invalid email';
        }
        return value;
    }, cli.getOptError('an email', 'EMAIL'));
}

cli.getIp = function (default_val) {
    return cli.getValue(default_val, function (value) {
        if (!value.match(/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/)) {
            throw 'Invalid IP';
        }
        return value;
    }, cli.getOptError('an IP', 'IP'));
}

cli.getPath = function (default_val, identifier) {
    identifier = identifier || 'path';
    return cli.getValue(default_val, function (value) {
        if (value.match(/[?*;{}]/)) {
            throw 'Invalid path';
        }
        return value;
    }, cli.getOptError('a ' + identifier, identifier.toUpperCase()));
}

cli.getArrayValue = function (arr, default_val) {
    return cli.getValue(default_val, function (value) {
        if (arr.indexOf(value) === -1) {
            throw 'Unexpected value';
        }
        return value;
    }, cli.getOptError('either [' + arr.join('|') + ']', 'VALUE'));
}

/**
 * Gets all data from STDIN (with optional encoding) and sends it to callback.
 *
 * @param {String} encoding (optional - default is 'utf8')
 * @param {Function} callback
 * @api public
 */
cli.withStdin = function (encoding, callback) {
    if (typeof encoding === 'function') {
        callback = encoding;
        encoding = 'utf8';
    }
    var stream = process.openStdin(), data = '';
    stream.setEncoding(encoding);
    stream.on('data', function (chunk) {
        data += chunk;
    });
    stream.on('end', function () {
        callback.apply(cli, [data]);
    });
};

/**
 * Gets all data from STDIN, splits the data into lines and sends it
 * to callback (callback isn't called until all of STDIN is read. To
 * process each line as it's received, see the method below
 *
 * @param {Function} callback
 * @api public
 */
cli.withStdinLines = function (callback) {
    cli.withStdin(function (data) {
        var sep = data.indexOf('\r\n') !== -1 ? '\r\n' : '\n';
        callback.apply(cli, [data.split(sep), sep]);
    });
};

/**
 * Asynchronously reads a file line by line. When a line is received,
 * callback is called with (line, sep) - when EOF is reached, callback
 * receives (null, null, true)
 *
 * @param {String} file (optional - default is 'stdin')
 * @param {String} encoding (optional - default is 'utf8')
 * @param {Function} callback (line, sep, eof)
 * @api public
 */
cli.withInput = function (file, encoding, callback) {
    if (typeof encoding === 'function') {
        callback = encoding;
        encoding = 'utf8';
    } else if (typeof file === 'function') {
        callback = file;
        encoding = 'utf8';
        file = 'stdin';
    }
    if (file === 'stdin') {
        file = process.openStdin();
    } else {
        try {
            file = cli.native.fs.createReadStream(file);
            file.on('error', cli.fatal);
        } catch (e) {
            return cli.fatal(e);
        }
    }
    file.setEncoding(encoding);
    var lines = [], data = '', eof, sep;
    file.on('data', function (chunk) {
        if (eof) return;
        data += chunk;
        if (!sep) {
            if (data.indexOf('\r\n') !== -1) {
                sep = '\r\n';
            } else if (data.indexOf('\n') !== -1) {
                sep = '\n';
            } else {
                last_line = data;
                return;
            }
        }
        lines = data.split(sep);
        data = eof ? null : lines.pop();
        while (lines.length) {
            callback.apply(cli, [lines.shift(), sep, false]);
        }
    });
    file.on('end', function () {
        eof = true;
        if (data.length) {
            callback.apply(cli, [data, sep || '', false]);
        }
        callback.apply(cli, [null, null, true]);
    });
};

/**
 * This function does a much better job at determining the object type than the typeof operator
 * @author Angus Croll  - https://javascriptweblog.wordpress.com/2011/08/08/fixing-the-javascript-typeof-operator/
 * @param  {Object} obj A Javascript object you wish to know the type of.
 * @return {string}     A string describing the Object's type if it is indeed a built in JavaScript type.
 */
cli.toType = function(obj) {
    var type = ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase();

    function isInt(n) {
        return Number(n) === n && n % 1 === 0;
    }

    function isFloat(n){
        return n === Number(n) && n % 1 !== 0;
    }

    if ( type === 'number' ) {
        if ( isInt(obj) ) {
            return 'integer';
        } else if ( isFloat(obj) ) {
            return 'float';
        }
    }

    return type;
}

/**
 * The main entry method. `callback` receives (args, options)
 *
 * @param {Function} callback
 * @api public
 */
cli.main = function (callback) {
    callback.call(cli, cli.args, cli.options);
}

/**
 * Bind creationix's stack (https://github.com/creationix/stack).
 *
 * Create a simple middleware stack by calling:
 *
 *     cli.createServer(middleware).listen(port);
 *
 * @return {Server} server
 * @api public
 */
cli.createServer = function(/*layers*/) {
    var defaultStackErrorHandler = function (req, res, err) {
        if (err) {
            console.error(err.stack);
            res.writeHead(500, {"Content-Type": "text/plain"});
            return res.end(err.stack + "\n");
        }
        res.writeHead(404, {"Content-Type": "text/plain"});
        res.end("Not Found\n");
    };
    var handle, error;
    handle = error = defaultStackErrorHandler;
    var layers = Array.prototype.slice.call(arguments);

    //Allow createServer(a,b,c) and createServer([a,b,c])
    if (layers.length && layers[0] instanceof Array) {
        layers = layers[0];
    }
    layers.reverse().forEach(function (layer) {
        var child = handle;
        handle = function (req, res) {
            try {
                layer(req, res, function (err) {
                    if (err) return error(req, res, err);
                    child(req, res);
                });
            } catch (err) {
                error(req, res, err);
            }
        };
    });
    return cli.native.http.createServer(handle);
};

/**
 * A wrapper for child_process.exec().
 *
 * If the child_process exits successfully, `callback` receives an array of
 * stdout lines. The current process exits if the child process has an error
 * and `errback` isn't defined.
 *
 * @param {String} cmd
 * @param {Function} callback (optional)
 * @param {Function} errback (optional)
 * @api public
 */
cli.exec = function (cmd, callback, errback) {
    cli.native.child_process.exec(cmd, function (err, stdout, stderr) {
        err = err || stderr;
        if (err) {
            if (errback) {
                return errback(err, stdout);
            }
            return cli.fatal('exec() failed\n' + err);
        }
        if (callback) {
            callback(stdout.split('\n'));
        }
    });
};

/**
 * Helper method for outputting a progress bar to the console.
 *
 * @param {Number} progress (0 <= progress <= 1)
 * @api public
 */
var last_progress_call, progress_len = 74, min_progress_increase = 5, last_progress_percentage = 0;
cli.progress = function (progress, decimals, stream) {
    stream = stream || process.stdout;
    if (progress < 0 || progress > 1 || isNaN(progress)) return;
    if (!decimals) decimals = 0;
    var now = (new Date()).getTime();
    if (last_progress_call && (now - last_progress_call) < 100 && progress !== 1) {
        return; //Throttle progress calls
    }
    last_progress_call = now;

    var pwr = Math.pow(10, decimals);
    var percentage_as_num = Math.floor(progress * 100 * pwr) / pwr;
    if (!stream.isTTY && percentage_as_num < 100 && percentage_as_num - last_progress_percentage < min_progress_increase) {
        return; //don't over-print if not TTY
    }
    last_progress_percentage = percentage_as_num;
    var percentage = percentage_as_num + '%';
    for (var i = 0; i < decimals; i++) {
        percentage += ' ';
    }
    if (!stream.isTTY) {
        if (percentage_as_num < 100) {
            stream.write(percentage + '...');
        }
        else {
            stream.write(percentage + '\n');
            last_progress_percentage = 0;
        }
        return;
    }
    var bar_length = Math.floor(progress_len * progress),
        str       = '';
    if (bar_length == 0 && progress > 0) {
        bar_length = 1;
    }
    for (i = 1; i <= progress_len; i++) {
        str += i <= bar_length ? '#' : ' ';
    }
    stream.clearLine();
    stream.write('[' + str + '] ' +  percentage);
    if (progress === 1) {
        stream.write('\n');
    } else {
        stream.cursorTo(0);
    }
};

/**
 * Helper method for outputting a spinner to the console.
 *
 * @param {String|Boolean} prefix (optional)
 * @api public
 */
var spinner_interval;
cli.spinner = function (prefix, end, stream) {
    stream = stream || process.stdout;
    if(!stream.isTTY) {
        stream.write(prefix + '\n');
        return;
    }
    if (end) {
        stream.clearLine();
        stream.cursorTo(0);
        stream.write(prefix + '\n');
        return clearInterval(spinner_interval);
    }
    prefix = prefix + ' ' || '';
    var spinner = ['-','\\','|','/'], i = 0, l = spinner.length;
    spinner_interval = setInterval(function () {
        stream.clearLine();
        stream.cursorTo(0);
        stream.write(prefix + spinner[i++]);
        if (i == l) i = 0;
    }, 200);
};
