// BetterDir
// version 1.0 BETA!
// 2005-05-02
// Copyright (c) 2005, Mark Pilgrim
// Released under the GPL license
// http://www.gnu.org/copyleft/gpl.html
//
// --------------------------------------------------------------------
//
// This is a Greasemonkey user script.  To install it, you need
// Greasemonkey 0.3 or later: http://greasemonkey.mozdev.org/
// Then restart Firefox and revisit this script.
// Under Tools, there will be a new menu item to "Install User Script".
// Accept the default configuration and install.
//
// To uninstall, go to Tools/Manage User Scripts,
// select "BetterDir", and click Uninstall.
//
// --------------------------------------------------------------------
//
// ==UserScript==
// @name          BetterDir
// @namespace     http://diveintomark.org/projects/greasemonkey/
// @description   make Apache 1.3-style directory listings prettier
// @include       *
// ==/UserScript==

function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

var titles, pre, headers, table, caption;
var tr0, header, a, nHeaders, th, pretext;
var row, rows, nRows, odd, rest, restcols, tr, td;
var nColumns, rightAlign, col, temp;
var footer, footertext;

titles = document.getElementsByTagName('title');
// if page has no title, bail
if (!titles.length) { return; }
// if page title does not start with "Index of /", bail
if (!(/^Index of \//.test(titles[0].textContent))) { return; }

// If we can't find the PRE element, this is either
// not a directory listing at all, or it's an
// Apache 2.x listing with fancy table output enabled
pre = document.getElementsByTagName('pre')[0];
if (!pre) { return; }
    
// find the column headers, or bail
headers = document.evaluate(
    "//a[contains(@href, '?')]",
    document,
    null,
    XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
    null);
if (!headers) { return; }
    
// Tables aren't evil, they're just supposed to be used for tabular data.
// This is tabular data, so let's make a TABLE element
table = document.createElement('table');
// give the table a summary, for accessibility
table.setAttribute('summary', 'Directory listing');
caption = document.createElement('caption');
// the "title" of the table should go in a CAPTION element
// inside the TABLE element, for semantic purity
caption.textContent = document.evaluate(
    "//head/title",
    document,
    null,
    XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.textContent;
table.appendChild(caption);
    
tr0 = document.createElement('tr');
nHeaders = 0;
for (var i = 0; i < headers.snapshotLength; i++) {
    header = headers.snapshotItem(i);
    // column headers go into TH elements, for accessibility
    th = document.createElement('th');
    a = document.createElement('a');
    a.href = header.href;
    a.textContent = header.textContent;
    // give each of the column header links a title,
    // to explain what the hell they do (it took me 5 years
    // to stumble onto this sorting feature -- 
    // titles might've helped, ya think?)
    a.title = "Sort by " + header.textContent.toLowerCase();
    th.appendChild(a);
    tr0.appendChild(th);
    nHeaders++;
}
table.appendChild(tr0);

pretext = pre.innerHTML;
if (/<hr/.test(pretext)) {
    pretext = pretext.split(/<hr.*?>/)[1];
}
rows = pretext.split(/\n/);
nRows = rows.length;
odd = true;
for (var i = 0; i < nRows; i++) {
    row = rows[i];
    row = row.replace(/^\s*|\s*$/g, '');
    if (!row) { continue; }
    if (/\<hr/.test(row)) { continue; }
    temp = row.split(/<\/a>/);
    a = temp[0] + '</a>';
    if (/<img/.test(a)) {
	a = a.split(/<img.*?>/)[1];
    }
    rest = temp[1];
    restcols = rest.split(/\s+/);
    
    tr = document.createElement('tr');
    td = document.createElement('td');
    td.innerHTML = a;
    tr.appendChild(td);
    
    nColumns = restcols.length;
    rightAlign = false;
    for (var j = 1 /* really */; j < nColumns; j++) {
	col = restcols[j];
	if (/\d\d:\d\d/.test(col)) {
	    td.innerHTML = td.innerHTML + ' ' + col;
	} else {
	    td = document.createElement('td');
	    td.innerHTML = restcols[j];
	    if (rightAlign) {
		td.setAttribute('class', 'flushright');
	    }
	    tr.appendChild(td);
	}
	rightAlign = true;
    }
    while (nColumns <= nHeaders) {
	tr.appendChild(document.createElement('td'));
	nColumns++;
    }
        
    // zebra-stripe table rows, from
    // http://www.alistapart.com/articles/zebratables/
    // and http://www.alistapart.com/articles/tableruler/
    tr.style.backgroundColor = odd ? '#eee' : '#fff';
    tr.onmouseover = function() { this.className = 'ruled'; return false; };
    tr.onmouseout = function() { this.className = ''; return false; };
    table.appendChild(tr);
    
    odd = !odd;
}

// copy address footer -- probably a much easier way to do this,
// but it's not always there (depends on httpd.conf options)
footertext = document.getElementsByTagName('address')[0];
if (footertext) {
    footer = document.createElement('address');
    footer.innerHTML = footertext.innerHTML;
}

// GreaseMonkey mythology states that wholesale DOM changes should
// be done on load, rather than in the GM script itself.  I don't know
//  if this is still true, or indeed if it was ever true, but
// a little chicken sacrifice never hurt anyone except the chicken.
window.addEventListener('load', 
    function() {
        document.body.innerHTML = '';
        document.body.appendChild(table);
        if (footer) {
            document.body.appendChild(footer);
        }
    },
    true);

// now that everything is semantic and accessible,
// make it a little prettier too
addGlobalStyle(
'table {' +
'  border-collapse: collapse;' +
'  border-spacing: 0px 0px 5px 0px;' +
'  margin-top: 1em;' +
'  width: 100%;' +
'}' +
'caption {' +
'  text-align: left;' +
'  font-weight: bold;' +
'  font-size: 180%;' +
'  font-family: Optima, Verdana, sans-serif;' +
'}' +
'tr {' +
'  padding-bottom: 5px;' +
'}' +
'td, th {' +
'  font-size: medium;' +
'  text-align: right;' +
'}' +
'th {' +
'  font-family: Optima, Verdana, sans-serif;' +
'  padding-right: 10px;' +
'  padding-bottom: 0.5em;' +
'}' +
'th:first-child {' +
'  padding-left: 20px;' +
'}' +
'td:first-child,' +
'td:last-child,' +
'th:first-child,' +
'th:last-child {' +
'  text-align: left;' +
'}' +
'td {' +
'  font-family: monospace;' +
'  border-bottom: 1px solid silver;' +
'  padding: 3px 10px 3px 20px;' +
'  border-bottom: 1px dotted #003399;' +
'}' +
'td a {' +
'  text-decoration: none;' +
'}' +
'tr.ruled {' +
'  background-color: #ffeecc ! important;' +
'}' +
'address {' +
'  margin-top: 1em;' +
'  font-style: italic;' +
'  font-family: Optima, Verdana, sans-serif;' +
'  font-size: small;' +
'  background-color: transparent;' +
'  color: silver;' +
'}');

//
// ChangeLog:
// 2005-05-02 - 1.0 - MAP - remove anon function wrapper, require GM 0.3
// 2005-04-21 - 0.9 - MAP - linted
// 2005-04-21 - 0.8 - MAP - changed addGlobalStyle to a normal function
// 2005-04-18 - 0.7 - MAP - tidy code
// 2005-04-15 - 0.6 - MAP - changed addGlobalStyle function to check for <head> element
// 2005-04-14 - 0.5 - MAP - older versions of Apache don't insert META tag, so check for page title instead
//