Node.JS console to file

//DO NOT PUT "use strict" HERE OR THE LOGGER WILL NOT BE ABLE TO LOG ERROR
/* ************************************************************************

        Version: 0.3

        License: LGPLv3

        Authors: Deisss

        Date: 2012-04-20

        Date of last modification: 2013-06-07

        Description: Define a shared stdout/stderror shared redirection

************************************************************************ */

// Module loaded
var fs   = require("fs"),
    util = require("util");

// Variables, do not forget / at then end !
var windows_error_log_root = __dirname + "/../",
    unix_error_log_root    = "/var/log/node/",

    max_line_number        = 10000,
    stdout                 = null,
    stderr                 = null,
    stdoutPath             = "",
    stderrPath             = "",
    maxct                  = max_line_number;

/*
--------------------------------------
  TIME FUNCTION
--------------------------------------
*/
/**
 * Print a date with "0" before if it's less than 10
 *
 * @param variable {Integer} A number (from date)
 * @return {String} The parsed date
*/
function beautifulDate(variable) {
    var prefix = (variable < 10) ? "0" : "";
    return prefix + variable;
};

/**
 * Print in a nice way the output date
 *
 * @return {String} The formatted date
*/
function outputDate() {
    var d = new Date();
    return ("" + d.getFullYear() + "-" + beautifulDate(d.getMonth()+1) + "-" + beautifulDate(d.getDate()) + "   " +
        beautifulDate(d.getHours()) + "." + beautifulDate(d.getMinutes()) + "." + beautifulDate(d.getSeconds()));
};

/**
 * Return a formatted date string
 *
 * @return {String} The formatted date
*/
var printDate = function() {
    var d = new Date();
    var tmp = outputDate();
    return (tmp.replace(".", ":") + "   (UTC : " + (d.getTimezoneOffset()/60) + "h) => ");
};

/*
--------------------------------------
  PATH FUNCTION
--------------------------------------
*/
/**
 * Get the main OS path, create it if needed
*/
function getOSRootPath() {
    var path = "";
    if(process.platform === "win32") {
        path = windows_error_log_root;
    } else {
        path = unix_error_log_root;
    }

    //Test or create the directory, we do it synchronously to never loose any log message
    try {
        if(!fs.statSync(windows_error_log_root).isDirectory()) {
            fs.mkdirSync(windows_error_log_root, 0600);
        }
    } catch(e) {
        fs.mkdirSync(windows_error_log_root, 0600);
    }

    return path;
};

/*
--------------------------------------
  STREAM FUNCTION
--------------------------------------
*/
/**
 * Start log stream system
*/
function createStream() {
    var path = getOSRootPath();

    stdoutPath = path + "access.log";
    stderrPath = path + "error.log";
    stdout = fs.createWriteStream(stdoutPath, { flags: "a" });
    stderr = fs.createWriteStream(stderrPath, { flags: "a" });
};

/**
 * Close log stream system
*/
function closeStream() {
    stdout.end();
    stderr.end();
};

/**
 * Close stream if needed
*/
function checkAndCloseStream() {
    maxct--;
    if(maxct <= 0) {
        closeStream();

        //Now we move log files to something usable
        var d = outputDate();
        fs.renameSync(stdoutPath, getOSRootPath() + "access-" + d + ".log");
        fs.renameSync(stderrPath, getOSRootPath() + "error-" + d + ".log");

        //Now we create again stream
        createStream();
        maxct = max_line_number;
    }
};

/**
 * Console logger object
*/
module.exports = new function() {
    /**
     * Print a log (any number of arguments allowed)
    */
    this.log = function() {
        console.log.apply(this, arguments);
        if(stdout != null && stdout.writable===true) {
            stdout.write(printDate() + util.format.apply(this, arguments) + "\n");
            checkAndCloseStream();
        }
    };

    /**
     * Print dir (any number of arguments allowed)
    */
    this.dir = function(object) {
        console.dir.apply(this, arguments);
        if(stdout != null && stdout.writable===true) {
            stdout.write(printDate() + util.inspect(object) + "\n");
            checkAndCloseStream();
        }
    };

    /**
     * Print an error (any number of arguments allowed)
    */
    this.error = function() {
        console.error.apply(this, arguments);
        if(stderr != null && stderr.writable===true) {
            stderr.write(printDate() + util.format.apply(this, arguments) + "\n");
            checkAndCloseStream();
        }
    };
    // Alias
    this.err = this.error;

    //Catching all system error
    process.on("uncaughtException", function(err) {
        this.error("Uncaught exception : ");
        this.error(err);
    }.bind(this));

    //We create the stream
    createStream();
};