#!/usr/bin/env python3
# coding=utf-8
""" A script that creates an index for a folder.
    """

import os
import sys
import time
import string
import urllib.parse
from glob import fnmatch
import base64
import random

VERSION = "20210128"
IMAGE_EXTENSIONS = ["png", "gif", "jpg", "jpeg", "tif", "tiff"]
AUDIO_EXTENSIONS = ["wav", "mp3", "ogg"]
VIDEO_EXTENSIONS = ["mp4", "ogg", "webm"]


def setup():
    """ Setup the command line options """
    from argparse import ArgumentParser

    parser = ArgumentParser(
        epilog="Recursively generate indexes: \n# find . -type d -not -path '*/.*' -exec SimpleWebPage -f \{\} \;"
    )
    parser.add_argument(
        "-f",
        action="store_true",
        dest="overwrite",
        default=False,
        help="Overwrite existing index file, even if it's not generated with SimpleWebPage. By default, if file is generated with SimpleWebPage it will be overwritten!",
    )
    parser.add_argument(
        "-H",
        action="store_true",
        dest="hidden",
        default=False,
        help="Show hidden files",
    )
    parser.add_argument(
        "-t",
        type=str,
        dest="title",
        default=None,
        help="Name for the title (Default: Folder name)",
    )
    parser.add_argument(
        "-o",
        type=str,
        dest="filename",
        default="index.html",
        help="Output filename (Default: index.html)",
    )
    parser.add_argument(
        "-p",
        action="store_false",
        dest="parent",
        default=True,
        help="Do no print .. link for parent folder.",
    )
    parser.add_argument(
        "--password",
        type=str,
        dest="password",
        default=None,
        help="Set a password to view page. The file list will be written to a randomly generated filename. Note: this is not secure, as the target link will still be unprotected if known.",
    )
    parser.add_argument(
        "-r",
        action="store_true",
        dest="recursive",
        default=False,
        help="Include all files recursively in the list. Do not include any folders.",
    )
    parser.add_argument(
        "--images",
        action="store_true",
        dest="images",
        default=False,
        help="Show images with <img> tags",
    )
    parser.add_argument(
        "--media",
        action="store_true",
        dest="media",
        default=False,
        help="Make media playable",
    )

    parser.add_argument(
        "--include",
        "-i",
        action="store",
        dest="includes",
        default=["*"],
        help="Glob match for files to be included in the table. ex. *.jpg. You can pass several includes.",
        nargs="*",
    )
    parser.add_argument("--version", action="version", version=VERSION)
    parser.add_argument(
        "path",
        type=str,
        action="store",
        default=os.path.abspath("."),
        nargs="?",
        help="Root path of the index",
    )

    options = parser.parse_args()
    options.path = os.path.abspath(options.path)
    if options.title == None:
        options.title = os.path.basename(options.path)
    return options


def setup2HTML(opts):
    return '<meta name="SimpleWebPageSetup" content="%s"/>' % ";".join(
        [
            "hidden=%s" % opts.hidden,
            "parent=%s" % opts.parent,
            "title=%s" % urllib.parse.quote(opts.title),
            "images=%s" % opts.images,
            "media=%s" % opts.media,
        ]
    )


def HTML2setup(opts):
    """ returns new opts and was it able to read HTML """
    try:
        read_config = False
        with open(os.path.join(opts.path, opts.filename), "rt") as f:
            for l in f.readlines():
                if l.find('<meta name="SimpleWebPageSetup"') > -1:
                    content = l[l.find('name="SimpleWebPageSetup"') :]
                    for s in content.split('"')[3].split(";"):
                        (k, v) = s.split("=", 1)
                        if k == "hidden":
                            opts.hidden = v == "True"
                        if k == "parent":
                            opts.parent = v == "True"
                        if k == "title":
                            opts.title = urllib.parse.unquote(v)
                        if k == "images":
                            opts.images = v == "True"
                        if k == "media":
                            opts.media = v == "True"
                    read_config = True
                    print("Reading options from existing " + opts.filename)
                    break
        return (opts, read_config)
    except:
        return (opts, False)


def get_files_and_folders(opts):

    if opts.recursive:
        rdirs = []
        rfiles = []
        rpath = None
        for path, dirs, files in os.walk(opts.path):
            if rpath == None:
                rpath = path
            if not opts.hidden:
                files = [f for f in files if not f.startswith(".")]
                dirs[:] = [d for d in dirs if not d.startswith(".")]
            files = [os.path.join(os.path.relpath(path, opts.path), f) for f in files]
            files = [f[2:] if f.startswith("./") else f for f in files]
            rfiles.extend(files)

        return rdirs, rfiles, rpath

    else:
        for path, dirs, files in os.walk(opts.path):
            if not opts.hidden:
                files = [f for f in files if not f.startswith(".")]
                dirs = [d for d in dirs if not d.startswith(".")]
            return dirs, files, path


def generate_index(opts):
    opts.password_filename = ""
    dirs, files, path = get_files_and_folders(opts)
    if opts.password != None:
        opts.password_filename = opts.filename
        opts.filename = generate_password_page(path, opts.filename, opts.password)
    existing_config = False
    if opts.filename in files:
        opts, existing_config = HTML2setup(opts)
        if not existing_config and not opts.overwrite:
            print(
                opts.filename
                + " exists, and not generated with SimpleWebPage. Exiting."
            )
            sys.exit(1)
    files = [f for f in files if f != opts.filename]
    files = [f for f in files if f != opts.password_filename]
    files = match_files(files, opts.includes)
    dirs.sort()
    files.sort()
    files.sort(key=lambda x: x.find("/") > 0)
    with open(os.path.join(path, opts.filename), "wt") as f:
        f.write(get_header(opts))
        if opts.parent:
            f.write(get_pathlink(path, ".."))
        for di in dirs:
            f.write(get_pathlink(path, di))
        for fi in files:
            f.write(get_filelink(path, fi, opts.images, opts.media))
        f.write(get_footer())
        f.write(get_wget_lines(files))
        f.close()
    return


def generate_password_page(path, password_file, password):
    def ha(p):
        h = 0
        for c in p:
            h = ((h << 5) - h) + ord(c)
            h = h & 0xFFFFFFFF
            if h > (1 << 31) - 1:
                h -= 1 << 32
        return h

    def scramble(p, t):
        p += t
        s = ""
        for i in range(len(t)):
            s += chr(ord(p[i]) + ord(t[i]))
        return s

    def enc(s):
        return base64.b64encode(s.encode("latin1")).decode("ascii")

    def random_string(stringLength=16):
        letters = string.ascii_lowercase + string.digits
        return "".join(random.choice(letters) for i in range(stringLength))

    def get_target(filename):
        splitted = os.path.splitext(filename)
        return (splitted[0], random_string(), splitted[1])

    target_base, target_middle, target_ext = get_target(password_file)
    secret = "{}:{}".format(ha(password), enc(scramble(password, target_middle)))
    with open(os.path.join(path, password_file), "wt") as f:
        f.write(get_password_page(secret, target_base, target_ext))
    return "{}.{}{}".format(target_base, target_middle, target_ext)


def get_filelink(path, fname, images=False, media=False):
    if os.path.islink(os.path.join(path, fname)) and not os.path.exists(
        os.path.join(path, fname)
    ):
        (fsize, fsstr, fsstrb, fdstr) = (0, "NA", "NA", "NA")
    else:
        fsize = os.path.getsize(os.path.join(path, fname))
        fsstr = sizeof(fsize)
        fsstrb = str(fsize)
        fdate = time.localtime(os.path.getmtime(os.path.join(path, fname)))
        fdstr = time.strftime("%Y/%m/%d %H:%M:%S", fdate)
    fname_str = fname
    if images and is_imagefile(fname):
        fname_str = get_imagestr(fname)
    if media and is_audiofile(fname):
        fname_str = get_audiostr(fname)
    if media and is_videofile(fname):
        fname_str = get_videostr(fname)
    return (
        '<tr><td><a class="link_file" href="%s">%s</a><td class="right">%s</td><td class="right bytes">%s</td><td class="right">%s</td></tr>\n'
        % (urllib.parse.quote(fname), fname_str, fsstr, fsstrb, fdstr)
    )


def get_wget_lines(files):
    wget = "\n<!--\n"
    for f in files:
        wget += "#FILE %s\n" % (urllib.parse.quote(f),)
    wget += "#WGET URL=[insert URL] && curl $URL | grep '^#FILE ' | cut -c7- | sed \"s,^,$URL,\" | xargs -n1 wget\n"
    wget += "-->\n"
    return wget


def get_imagestr(fname):
    return '<img src="%s" title="%s"/>' % (urllib.parse.quote(fname), fname)


def get_audiostr(fname):
    return '%s<br><audio src="%s" controls class=audio></audio>' % (
        fname,
        urllib.parse.quote(fname),
    )


def get_videostr(fname):
    return '%s<br><video class=video controls><source src="%s"></video>' % (
        fname,
        urllib.parse.quote(fname),
    )


def get_pathlink(path, dname):
    fdate = time.localtime(os.path.getmtime(os.path.join(path, dname)))
    fdstr = time.strftime("%Y/%m/%d %H:%M:%S", fdate)
    return (
        '<tr><td><a class="link_dir" href="%s">&#8627;&nbsp;%s/</a><td class="right">[DIR]</td><td class="right bytes">0</td><td class="right">%s</td></tr>\n'
        % (urllib.parse.quote(dname), dname, fdstr)
    )


def get_password_page(secret, target_base, target_ext):
    return (
        """<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <link rel="shortcut icon" href="data:image/x-icon;," type="image/x-icon">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Password required</title>
<script language="JavaScript">
Object.defineProperty(String.prototype, 'hashCode', {
  value: function() {
    var hash = 0, i, chr;
    for (i = 0; i < this.length; i++) {
      chr   = this.charCodeAt(i);
      hash  = ((hash << 5) - hash) + chr;
      hash |= 0; // Convert to 32bit integer
    }
    return hash;
  }
});
function scramble(p,t) {
    p += t;
    var sstr = '';
    for (var i=0; i < t.length; i++) {
      sstr += String.fromCharCode(p.charCodeAt(i) + t.charCodeAt(i));
    }
    return sstr;
}
function unscramble(p,t) {
    var sstr = '';
    var schr = '';
    for (var i=0; i < t.length; i++) {
      schr = String.fromCharCode(t.charCodeAt(i) - p.charCodeAt(i));
      sstr += schr;
      p += schr;
    }
    return sstr;
}
function pw_event(element) {
    if(event.key === 'Enter') {
        pw(element);
    }
}
function pw(element) {
    var pw = "SECRET";
    if (element.value) {
        pw = pw.split(':',2);
        if (element.value.hashCode() == parseInt(pw[0])) {
            this.location.href = "TARGET_BASE." + unscramble(element.value, atob(pw[1])) + "TARGET_EXT";
        } else {
            document.getElementById("message").innerHTML = "No match";
            setTimeout(clear_message, 5000);
        }
    }
}
function clear_message() {
   document.getElementById("message").innerHTML = '';
}
function newPass(password, target) {
    console.log(
      '    var pw = "' + password.hashCode().toString() + ':' +
      btoa(scramble(password, target)) + '";'
    );
}
//console.log("Use newPass('pass','page.html'); to get a new hash");
</script>
<style>
#content {
  text-align: center;
  padding-top: 4rem;
  font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
  font-weight: bold;
}
#message {
  margin-top: 1rem;
}
#button {
  margin-top: 1rem;
}
</style>
</head>
<body>
<div id="content">
<input type="password" placeholder="Password" class="password" onkeydown="pw_event(this)" id="password" onFocus="this.select()" autofocus/>
<br><button id="button" type="button" onclick="pw(document.getElementById('password'));">Enter</button>
<div id="message"></div>
<noscript><br>Javascript is required to access this area. Yours seems to be disabled.</noscript>
</div>
</body>
</html>""".replace(
            "TARGET_EXT", target_ext, 1
        )
        .replace("TARGET_BASE", target_base, 1)
        .replace("SECRET", secret, 1)
    )


def get_header(opts):
    header = (
        """<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <meta name="generator" content="SimpleWebPage """
        + VERSION
        + """" />
  """
        + setup2HTML(opts)
        + """
  <title>"""
        + opts.title
        + """</title>
  <style>
    /* Style modified from: https://css-tricks.com/snippets/php/display-styled-directory-contents/ */
        * {
      padding: 0;
      margin: 0;
    }
    body {
        color: #222;
        font: 14px monospace;
        padding: 20px;
        background: #CCC;
    }
    h1 {
      text-align: center;
      padding: 20px 0 12px 0;
      margin: 0;
      font-family: sans-serif;
    }
    .container {
      box-shadow: 0 5px 10px -5px rgba(0,0,0,0.5);
      position: relative;
      background: #eee;
      border-top-left-radius: 6em;
    }
    table {
      background-color: #F3F3F3;
      border-collapse: collapse;
      width: 100%;
      margin: 15px 0;
    }
    th {
      background-color: #EB6000;
      color: #FFF;
      cursor: pointer;
      padding: 5px 10px;
    }
    td {
      padding-right: 5px;
    }
    a {
      text-decoration: none;
    }

    td a {
      color: #EB6000;
      display: block;
      padding: 5px 10px;
    }
    th a {
      padding-left: 0
    }
    td:first-of-type a {
      padding-left: 5px;
    }
    th:first-of-type {
      padding-left: 5px;
    }
    tr:nth-of-type(odd) {
      background-color: #DDD;
    }
    tr:hover td {
      background-color:#BBB;
    }
    tr:hover td a {
      color: #222;
    }
    .right {
        text-align: right;
    }
    .bytes {
        font-size: xx-small;
    }
    .audio {
        width: 90%;
    }
    .video {
        width: 320;
        height: 240;
    }
 </style>
 <script type="text/javascript">
/*
Table sorting script  by Joost de Valk, check it out at http://www.joostdevalk.nl/code/sortable-table/.
Based on a script from http://www.kryogenix.org/code/browser/sorttable/.
Distributed under the MIT license: http://www.kryogenix.org/code/browser/licence.html .
Edited, removed image support and a tags from headers, Ville Rantanen 2015

Copyright (c) 1997-2007 Stuart Langridge, Joost de Valk.

Version 1.5.7
*/

/* You can change these values */
var europeandate = true;
var alternate_row_colors = false;

/* Don't change anything below this unless you know what you're doing */
addEvent(window, "load", sortables_init);

var SORT_COLUMN_INDEX;
var thead = false;

function sortables_init() {
	// Find all tables with class sortable and make them sortable
	if (!document.getElementsByTagName) return;
	tbls = document.getElementsByTagName("table");
	for (ti=0;ti<tbls.length;ti++) {
		thisTbl = tbls[ti];
		if (((' '+thisTbl.className+' ').indexOf("sortable") != -1) && (thisTbl.id)) {
			ts_makeSortable(thisTbl);
		}
	}
}

function ts_makeSortable(t) {
	if (t.rows && t.rows.length > 0) {
		if (t.tHead && t.tHead.rows.length > 0) {
			var firstRow = t.tHead.rows[t.tHead.rows.length-1];
			thead = true;
		} else {
			var firstRow = t.rows[0];
		}
	}
	if (!firstRow) return;

	// We have a first row: assume it's the header, and make its contents clickable links
	for (var i=0;i<firstRow.cells.length;i++) {
		var cell = firstRow.cells[i];
		var txt = ts_getInnerText(cell);
		if (cell.className != "unsortable" && cell.className.indexOf("unsortable") == -1) {
			cell.innerHTML = '<span class="sortheader" onclick="ts_resortTable(this, '+i+');return false;">'+txt+'<span class="sortarrow">&nbsp;&nbsp;&varr;</span></span>';
		}
	}
	if (alternate_row_colors) {
		alternate(t);
	}
}

function ts_getInnerText(el) {
	if (typeof el == "string") return el;
	if (typeof el == "undefined") { return el };
	if (el.innerText) return el.innerText;	//Not needed but it is faster
	var str = "";

	var cs = el.childNodes;
	var l = cs.length;
	for (var i = 0; i < l; i++) {
		switch (cs[i].nodeType) {
			case 1: //ELEMENT_NODE
				str += ts_getInnerText(cs[i]);
				break;
			case 3:	//TEXT_NODE
				str += cs[i].nodeValue;
				break;
		}
	}
	return str;
}

function ts_resortTable(lnk, clid) {
	var span;
	for (var ci=0;ci<lnk.childNodes.length;ci++) {
		if (lnk.childNodes[ci].tagName && lnk.childNodes[ci].tagName.toLowerCase() == 'span') span = lnk.childNodes[ci];
	}
	var spantext = ts_getInnerText(span);
	var td = lnk.parentNode;
	var column = clid || td.cellIndex;
	var t = getParent(td,'TABLE');
	// Work out a type for the column
	if (t.rows.length <= 1) return;
	var itm = "";
	var i = 0;
	while (itm == "" && i < t.tBodies[0].rows.length) {
		var itm = ts_getInnerText(t.tBodies[0].rows[i].cells[column]);
		itm = trim(itm);
		if (itm.substr(0,4) == "<!--" || itm.length == 0) {
			itm = "";
		}
		i++;
	}
	if (itm == "") return;
	sortfn = ts_sort_caseinsensitive;
	if (itm.match(/^\d\d[\/\.-][a-zA-z][a-zA-Z][a-zA-Z][\/\.-]\d\d\d\d$/)) sortfn = ts_sort_date;
	if (itm.match(/^\d\d[\/\.-]\d\d[\/\.-]\d\d\d{2}?$/)) sortfn = ts_sort_date;
	if (itm.match(/^-?[£$€Û¢´]\d/)) sortfn = ts_sort_numeric;
	if (itm.match(/^-?(\d+[,\.]?)+(E[-+][\d]+)?%?$/)) sortfn = ts_sort_numeric;
	SORT_COLUMN_INDEX = column;
	var firstRow = new Array();
	var newRows = new Array();
	for (k=0;k<t.tBodies.length;k++) {
		for (i=0;i<t.tBodies[k].rows[0].length;i++) {
			firstRow[i] = t.tBodies[k].rows[0][i];
		}
	}
	for (k=0;k<t.tBodies.length;k++) {
		if (!thead) {
			// Skip the first row
			for (j=1;j<t.tBodies[k].rows.length;j++) {
				newRows[j-1] = t.tBodies[k].rows[j];
			}
		} else {
			// Do NOT skip the first row
			for (j=0;j<t.tBodies[k].rows.length;j++) {
				newRows[j] = t.tBodies[k].rows[j];
			}
		}
	}
	newRows.sort(sortfn);
	if (span.getAttribute("sortdir") == 'down') {
			ARROW = '&nbsp;&nbsp;&uarr;';
			newRows.reverse();
			span.setAttribute('sortdir','up');
	} else {
			ARROW = '&nbsp;&nbsp;&darr;';
			span.setAttribute('sortdir','down');
	}
    // We appendChild rows that already exist to the tbody, so it moves them rather than creating new ones
    // don't do sortbottom rows
    for (i=0; i<newRows.length; i++) {
		if (!newRows[i].className || (newRows[i].className && (newRows[i].className.indexOf('sortbottom') == -1))) {
			t.tBodies[0].appendChild(newRows[i]);
		}
	}
    // do sortbottom rows only
    for (i=0; i<newRows.length; i++) {
		if (newRows[i].className && (newRows[i].className.indexOf('sortbottom') != -1))
			t.tBodies[0].appendChild(newRows[i]);
	}
	// Delete any other arrows there may be showing
	var allspans = document.getElementsByTagName("span");
	for (var ci=0;ci<allspans.length;ci++) {
		if (allspans[ci].className == 'sortarrow') {
			if (getParent(allspans[ci],"table") == getParent(lnk,"table")) { // in the same table as us?
				allspans[ci].innerHTML = '&nbsp;&nbsp;&varr;';
			}
		}
	}
	span.innerHTML = ARROW;
	alternate(t);
}

function getParent(el, pTagName) {
	if (el == null) {
		return null;
	} else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase()) {
		return el;
	} else {
		return getParent(el.parentNode, pTagName);
	}
}

function sort_date(date) {
	// y2k notes: two digit years less than 50 are treated as 20XX, greater than 50 are treated as 19XX
	dt = "00000000";
	if (date.length == 11) {
		mtstr = date.substr(3,3);
		mtstr = mtstr.toLowerCase();
		switch(mtstr) {
			case "jan": var mt = "01"; break;
			case "feb": var mt = "02"; break;
			case "mar": var mt = "03"; break;
			case "apr": var mt = "04"; break;
			case "may": var mt = "05"; break;
			case "jun": var mt = "06"; break;
			case "jul": var mt = "07"; break;
			case "aug": var mt = "08"; break;
			case "sep": var mt = "09"; break;
			case "oct": var mt = "10"; break;
			case "nov": var mt = "11"; break;
			case "dec": var mt = "12"; break;
			// default: var mt = "00";
		}
		dt = date.substr(7,4)+mt+date.substr(0,2);
		return dt;
	} else if (date.length == 10) {
		if (europeandate == false) {
			dt = date.substr(6,4)+date.substr(0,2)+date.substr(3,2);
			return dt;
		} else {
			dt = date.substr(6,4)+date.substr(3,2)+date.substr(0,2);
			return dt;
		}
	} else if (date.length == 8) {
		yr = date.substr(6,2);
		if (parseInt(yr) < 50) {
			yr = '20'+yr;
		} else {
			yr = '19'+yr;
		}
		if (europeandate == true) {
			dt = yr+date.substr(3,2)+date.substr(0,2);
			return dt;
		} else {
			dt = yr+date.substr(0,2)+date.substr(3,2);
			return dt;
		}
	}
	return dt;
}

function ts_sort_date(a,b) {
	dt1 = sort_date(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
	dt2 = sort_date(ts_getInnerText(b.cells[SORT_COLUMN_INDEX]));

	if (dt1==dt2) {
		return 0;
	}
	if (dt1<dt2) {
		return -1;
	}
	return 1;
}
function ts_sort_numeric(a,b) {
	var aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
	aa = clean_num(aa);
	var bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
	bb = clean_num(bb);
	return compare_numeric(aa,bb);
}
function compare_numeric(a,b) {
	var a = parseFloat(a);
	a = (isNaN(a) ? 0 : a);
	var b = parseFloat(b);
	b = (isNaN(b) ? 0 : b);
	return a - b;
}
function ts_sort_caseinsensitive(a,b) {
	aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).toLowerCase();
	bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).toLowerCase();
	if (aa==bb) {
		return 0;
	}
	if (aa<bb) {
		return -1;
	}
	return 1;
}
function ts_sort_default(a,b) {
	aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
	bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
	if (aa==bb) {
		return 0;
	}
	if (aa<bb) {
		return -1;
	}
	return 1;
}
function addEvent(elm, evType, fn, useCapture)
// addEvent and removeEvent
// cross-browser event handling for IE5+,	NS6 and Mozilla
// By Scott Andrew
{
	if (elm.addEventListener){
		elm.addEventListener(evType, fn, useCapture);
		return true;
	} else if (elm.attachEvent){
		var r = elm.attachEvent("on"+evType, fn);
		return r;
	} else {
		alert("Handler could not be removed");
	}
}
function clean_num(str) {
	str = str.replace(new RegExp(/[^-?0-9.]/g),"");
	return str;
}
function trim(s) {
	return s.replace(/^\s+|\s+$/g, "");
}
function alternate(table) {
	// Take object table and get all it's tbodies.
	var tableBodies = table.getElementsByTagName("tbody");
	// Loop through these tbodies
	for (var i = 0; i < tableBodies.length; i++) {
		// Take the tbody, and get all it's rows
		var tableRows = tableBodies[i].getElementsByTagName("tr");
		// Loop through these rows
		// Start at 1 because we want to leave the heading row untouched
		for (var j = 0; j < tableRows.length; j++) {
			// Check if j is even, and apply classes for both possible results
			if ( (j % 2) == 0  ) {
				if ( !(tableRows[j].className.indexOf('odd') == -1) ) {
					tableRows[j].className = tableRows[j].className.replace('odd', 'even');
				} else {
					if ( tableRows[j].className.indexOf('even') == -1 ) {
						tableRows[j].className += " even";
					}
				}
			} else {
				if ( !(tableRows[j].className.indexOf('even') == -1) ) {
					tableRows[j].className = tableRows[j].className.replace('even', 'odd');
				} else {
					if ( tableRows[j].className.indexOf('odd') == -1 ) {
						tableRows[j].className += " odd";
					}
				}
			}
		}
	}
}

 </script>
 </head>
 <body>
<div class="container">
<h1>"""
        + opts.title
        + """</h1>
<table class="sortable" id="fileList"><thead><tr><th>Name</th><th class="right">Size</th><th class="right">Size B</th><th class="right">Modified</th></tr></thead><tbody>
"""
    )
    return header


def get_footer():
    return """</tbody></table></div>
</body></html>"""


def is_imagefile(fname):
    for ext in IMAGE_EXTENSIONS:
        if fname.lower().endswith(ext):
            return True
    return False


def is_audiofile(fname):
    for ext in AUDIO_EXTENSIONS:
        if fname.lower().endswith(ext):
            return True
    return False


def is_videofile(fname):
    for ext in VIDEO_EXTENSIONS:
        if fname.lower().endswith(ext):
            return True
    return False


def match_files(files, glob_list):
    matched = []
    for f in files:
        for g in glob_list:
            if fnmatch.fnmatch(f, g):
                matched.append(f)
                break
    return matched


def sizeof(num):
    for x in ["&nbsp;B", "KB", "MB", "GB", "TB"]:
        if num < 1024.0:
            if x == "&nbsp;B":
                return "%d&nbsp;%s" % (num, x)
            return "%3.1f&nbsp;%s" % (num, x)
        num /= 1024.0


if __name__ == "__main__":
    opts = setup()
    generate_index(opts)